McQuay MicroTech II Operating instructions

Brand: McQuay

Model: MicroTech II

Category: Split-system air conditioners

Type: Operating instructions

MicroTech II™

Applied Rooftop Unit Controller

Space Comfort Control (SCC)

• Used with McQuay models: RPS, RFS, RCS, RPR, RFR, RDT, RDS,

RAR and RAH

Operation Manual OM 138

Group:

Applied Systems

Part Number:

OM138

Date:

April 2001

Discharge Cooling

Disch Air= 55.0°F

Clg Capacity= 50%

Eff Clg Spt= 55°F

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Using the Keypad/Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Menu Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Display Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Password Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Keypad Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Keypad/Display Exercises . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Keypad/Display Menu Reference . . . . . . . . . . . . . . . . . . . . . . . . . 13

System Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Schedules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Setup/Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Active Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Previous Alarms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Operator’s Guide . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Determining Unit Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

UnitStatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Clg Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Htg Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Clg Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Htg Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Auto/Manual Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Ctrl Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Appl Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Occupancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Occ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Occ Src . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Bypass Time (Tenant Override). . . . . . . . . . . . . . . . . . . . . . . 48

Emergency Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Setting Controller Date and Time . . . . . . . . . . . . . . . . . . . . . 49

Internal Daily Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Holiday Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

One Event Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Optimal Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

External Time Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Network Time Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Alarm Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

About Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Remote Alarm Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Local Alarm Indication (Keypad/Display) . . . . . . . . . . . . . . . . 53

Remote Alarm Clearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Configuring Remote Alarm Output. . . . . . . . . . . . . . . . . . . . . 54

Setting Alarm Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Unit Configuration/Service Parameters . . . . . . . . . . . . . . . . . . . . . 56

Calibrate Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Zone (Space) Temperature Sensor . . . . . . . . . . . . . . . . . . . . 56

Miscellaneous Service Parameters . . . . . . . . . . . . . . . . . . . . 57

Control Timer Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Manual Output Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Description of Operation . . . . . . . . . . . . . . . . . . . . 61

Operating States and Sequences . . . . . . . . . . . . . . . . . . . . . . . . . 61

About Operating States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Operating State Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . 61

Operating State Sequence Chart. . . . . . . . . . . . . . . . . . . . . . 64

Startup Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Before Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Fan Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Heat/Cool Changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

0-30% Outdoor Air Damper Control . . . . . . . . . . . . . . . . . . . . . . . . 68

Minimum Ventilation Control . . . . . . . . . . . . . . . . . . . . . . . . . 68

100% Outdoor Air Damper Control. . . . . . . . . . . . . . . . . . . . . . . . . 68

Economizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Economizer Changeover Method. . . . . . . . . . . . . . . . . . . . . . 69

Minimum Ventilation Control . . . . . . . . . . . . . . . . . . . . . . . . . 70

Cooling: Multistage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Low Ambient Cooling Lockout . . . . . . . . . . . . . . . . . . . . . . . . 73

Compressor Staging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Condenser Fan Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Circuit Pumpdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Cooling: Modulating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Heating: Multistage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Morning Warm-up Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

High Ambient Heating Lockout. . . . . . . . . . . . . . . . . . . . . . . . 79

Discharge Air Low Limit Control . . . . . . . . . . . . . . . . . . . . . . . 80

Heating: Modulating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Morning Warm-up Control . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

High Ambient Heating Lockout. . . . . . . . . . . . . . . . . . . . . . . . 84

Discharge Air Low Limit Control . . . . . . . . . . . . . . . . . . . . . . . 84

Dehumidification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Enabling Dehumidification . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Dehumidification Cooling Operation. . . . . . . . . . . . . . . . . . . . 85

Dehumidification Heating Operation. . . . . . . . . . . . . . . . . . . . 86

Energy Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Enthalpy Wheel Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Exhaust Fan Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Energy Recovery Bypass Damper Control. . . . . . . . . . . . . . . 88

Return Fan Capacity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Direct Building Static Pressure Control . . . . . . . . . . . . . . . . . 88

Return Fan Direct Position Control. . . . . . . . . . . . . . . . . . . . . 89

SAF/RAF Differential OA Reset . . . . . . . . . . . . . . . . . . . . . . . 89

Unoccupied Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Unoccupied Heating (Night Setback) . . . . . . . . . . . . . . . . . . . 89

Unoccupied Cooling (Night Setup) . . . . . . . . . . . . . . . . . . . . . 90

Purge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Alarm Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

MicroTech II DDC Features . . . . . . . . . . . . . . . . . . 99

Direct PID Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Cascaded PID Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

PID Control Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Proportional Band and Integral Time . . . . . . . . . . . . . . . . . . 100

Adjusting PID Control Parameters . . . . . . . . . . . . . . . . . . . . . . . . 100

Correcting System Instability (“Hunting”) . . . . . . . . . . . . . . . 100

Correcting System “Sluggishness” . . . . . . . . . . . . . . . . . . . . 101

Software Identification and Configuration. . . . . 102

Main Control Board (MCB) Configuration. . . . . . . . . . . . . . . . . . . 102

Main Control Board (MCB) Data Archiving. . . . . . . . . . . . . . . . . . 103

Keypad/Display Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 105

OM 138 3

McQuay, MicroTech II, and RoofPak are registered trademarks of McQuay International.

Microsoft is a registered trademark of Microsoft Corporation.

Windows is a trademark of Microsoft Corporation.

Document Number:

OM 138

Revision: April 2001

4 OM 138

Introduction

This manual provides information regarding the MicroTech

II control system used in the McQuay RoofPak applied roof-

top unit product line. It specifically describes the sequences

of operation and programmable options for units with fac-

tory equipped space comfort control (SCC) software. It also

includes information regarding how to use the keypad/dis-

play to enter and display data.

For information regarding MicroTech II components,

input/output configurations, field wiring options and require-

ments, and service procedures, refer to IM696, MicroTech II

Applied Rooftop Unit Controller. For installation and startup

instructions and general information regarding a particular

rooftop unit, refer to the applicable model-specific installa-

tion and maintenance manual (refer to Table 1).

Table 1: Model-Specific Rooftop Unit Installation

Literature

Rooftop Unit Model

Installation & Maintenance Data

Bulletin Number

RPS (18-40 tons)

IM 157RFS (18-40 tons)

RCS (18-40 tons)

RPS (45-135 tons)

IM 485RFS (45-135 tons)

RCS (45-135 tons)

RDT IM 486

RDS (800 & 802) IM 178

RAH IM 487

NOTICE

This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in

accordance with this instruction manual, may cause interference to radio communications. It has been tested

and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC rules. These

limits are designed to provide reasonable protection against harmful interference when the equipment is

operated in a commercial environment. Operation of this equipment in a residential area is likely to cause

harmful interference in which case the user is required to correct the interference at his own expense.

McQuay International disclaims any liability resulting from any interference or for the correction

thereof.

WARNING

Electric shock hazard. Can cause personal injury or equipment damage.

This equipment must be properly grounded. Connections and service to the MicroTech II control panel must

be performed only by personnel that are knowledgeable in the operation of the equipment being controlled.

WARNING

Excessive moisture in the control panel can cause hazardous working conditions and improper

equipment operation.

When servicing this equipment during rainy weather, the electrical components in the main control panel

must be protected from the rain.

OM 138 5

CAUTION

Extreme temperature hazard. Can cause damage to system components.

The MicroTech II controller is designed to operate in ambient temperatures from -20°F to 125°F. It can be

stored in ambient temperatures from -40°F to 140°F. It is designed to be stored and operated in relative

humidity up to 95% (non-condensing).

CAUTION

Static sensitive components. A static discharge while handling electronic circuit boards can cause

damage to the components.

Discharge any static electrical charge by touching the bare metal inside the main control panel before per-

forming any service work. Never unplug any cables, circuit board terminal blocks, relay modules, or power

plugs while power is applied to the panel.

WARNING

To avoid possible unit damage, Compressor pumpdown is required before removing power to the controller.

6 OM 138

Getting Started

The MicroTech II Applied Rooftop Unit Controller is a self-

contained device that is capable of complete, stand-alone

operation. Information in the controller can be displayed and

modified by using the keypad/display in the unit main con-

trol panel.

The following sections describe how to use the keypad/dis-

play.

Using the Keypad/Display

The keypad/display, shown in Figure 1, is provided with all

MicroTech II Applied Rooftop Unit Controllers on these

units. With the keypad/display, operating conditions, system

alarms, control parameters, and schedules can be monitored.

After password entry, set points, parameters, and schedules

can be edited.

Menu Structure

The keypad accessible information in the MicroTech II con-

troller is organized in a menu structure to provide quick

access. As shown in Figure 2 on page 7, this structure con-

tains 1 main menu and a string of 47 sub-menus. Each sub-

menu is made up of one or more menu items. The string of

47 sub-menus is divided into 8 “categories.” The main menu

has eight items within it that “point” or provide a “book-

mark” to the first sub-menu within the respective category.

The eight categories in the main menu are “System Sum-

mary”, “Airflow”, “Temperature”, “Humidity”, “Schedules”,

“Setup/Service”, “Active Alarms” and “Previous Alarms.”

The name of each category generally describes the basic pur-

pose of the menus in the particular group. Complete infor-

mation regarding the contents of each sub-menu is included

in “Keypad/Display Menu Reference” on page 13.

Figure 1: Keypad/display

Discharge Cooling

Disch Air= 55.0°F

Clg Capacity= 50%

Eff Clg Spt= 55°F

OM 138 7

Figure 2: Keypad Accessible Menu Structure

Sub Menus

Keypad Key Definitions

Move Display Left

Move Edit Cursor Left

System Summary

Airflow

Humidity

Schedules

Setup/Service

Active Alarms

Previous Alarms

Temperatures

System

1 2 3

UnitStatus= _____

Clg Capacity= xxx%

Htg Capacity= xxx%

Clg Status= _____

Htg Status= _____

Ctrl Mode= Auto

Appl Mode= Heat/Cool

Occupancy

Occupancy= _____

Occ Mode= Auto

Occ Src= _____

Bypass Time= 0min

Emerg Override= Norm

Temperatures

Control Temp= xxx.x°F

Disch Air= xxx.x°F

Return Air= xxx.x°F

Space Temp= xxx.x°F

OA Temp= xxx.x°F

Ent Fan= xxx.x°F

Airflow Summary

Flow Status= _____

Disch Fan= _____

RF/EF Fan= _____

Fan Operation= _____

Bldg Pressure Zone Cooling

Control Temp= xxx.x°F

Clg Capacity= xxx%

Eff Clg Spt= xxx.x°F

Occ Clg Spt= 75.0°F

Clg Deadband= 2.0°F

CtrlTemp Src= Return

Space Temp= xxx.x°F

UnoccClg Spt= 85.0°F

UnoccClgDiff= 3.0°F

Clg Status= _____

OATComp Lock= 55°F

OATLock Diff= 1°F

Bldg Press= x.xx"WC

BldgSP Spt= 0.050"WC

BSP Db= 0.010"WC

RF/EF Fan Cap= xxx%

Discharge Cooling

Disch Air= xxx.x°F

Clg Capacity= xxx%

Eff Clg Spt= xxx.x°F

Clg Db= 1.0°F

Min Clg Spt= 55.0°F

Max Clg Spt= 65.0°F

Discharge Heating

Disch Air= xxx.x°F

Htg Capacity= xxx%

Eff Htg Spt= xxx.x°F

Htg Db= 1.0°F

Min Htg Spt= 60.0°F

Max Htg Spt= 120.0°F

Min DAT Ctrl= Yes

MinDAT Limit= 55.0°F

OA Damper

OA Damper Pos= xxx%

Eff Min OA Pos= xxx%

OA Flow= xxxxxCFM

OA Ambient= _____

MinOA Type= None

DesignFlow= No

MinOA Pos= 10%

MinOA Flow= 2000CFM

MinOA @Max Sig= 60%

Min Signal= 0%

Max Signal= 100%

MinOAResetMax= 100%

Max Fan Diff= 50%

Min Fan Diff= 20%

Reset T Limit= 0°F

EconChgovr= Enthalpy

EconChgovrT= 60°F

EconChgovrDiff= 1°F

Max Purge= 60min

OA Temp= xxx.x°F

Energy Recovery

RF/EF Fan Cap= xxx%

EF Min Cap= 5%

Energy Rec= Yes

Dehumidification

Dehum Status= _____

Rel Humidity= xxx%

Dew Point= xx.x°F

Dehum Method=None

RH Setpoint= 50%

DewPoint Spt= 50°F

DewPnt Db= 2°F

RH Db= 2%

Main Menu

SAVE

ENTER

CANCEL

BACK

ALARM

CLEAR

CANCEL

BACK

Zone Heating

Control Temp= xxx.x°F

Htg Capacity= xxx%

Eff Htg Spt= xxx.x°F

Occ Htg Spt= 70.0°F

Htg Deadband= 2.0°F

CtrlTemp Src= Return

Space Temp= xxx.x°F

UnoccHtg Spt= 55.0°F

UnoccHtgDiff= 3.0°F

Htg Status= _____

OATHtg Lock= 55°F

OATLock Diff= 1°F

Move Display Right

Move Edit Cursor Right

Move Display Up

Increment Adjustable Parameter

Move Display Down

Decrement Adjustable Parameter

Backup To Previous Menu

Cancel Editing Command

Select Menu

Save Edited Parameter

Display Active Alarm Clear Active Alarm

8 OM 138

Figure2: Keypad Accessible Menu Structure (Continued)

Daily Schedule

5 6

Mon= 00:00 - 00:00

Tue= 00:00 - 00:00

Wed= 00:00 - 00:00

Thu= 00:00 - 00:00

Fri= 00:00 - 00:00

Sat= 00:00 - 00:00

Sun= 00:00 - 00:00

Hol= 00:00 - 00:00

One Event Schedule

Beg= mmm dd@hh:mm

End= mmm dd@hh:mm

Optimal Start

Space Temp= xxx.x°F

Optimal Start= No

Auto Update= Yes

Htg Rate= 0.4°F/min

Htg OAT= 35°F

2nd P Sensor= None

RF/EF Ctrl= Tracking

Rem RF/EF Cap= 25%

Eng Units= English

Passwords

Timeout= 15min

Clear Alarm= No

Operating Hours

Fan= xxxxx hr

Mech Cool= xxxxx hr

Comp 1= xxxxx hr

Comp 2= xxxxx hr

Comp 3= xxxxx hr

Comp 4= xxxxx hr

Heating= xxxxx hr

Economizer= xxxxx hr

Bypass= xxxxx hr

Dehumidify= xxxxx hr

Timer Settings

Service= 0min

Recirculate= 3min

Low DAT= 3min

Max MWU= 90min

Bypass= 120min

Start Init= 180sec

Min Exh On= 120sec

Min Exh Off= 120sec

Time= hh:mm:ss

Day= day

Date= dd-mmm-yyyy

Holiday Schedule

Hol 1=mmmdd-mmmdd

Hol 2=mmmdd-mmmdd

Hol 3=mmmdd-mmmdd

Hol 4=mmmdd-mmmdd

Hol 5=mmmdd-mmmdd

Hol 6=mmmdd-mmmdd

Hol 7=mmmdd-mmmdd

Hol 8=mmmdd-mmmdd

Hol 9=mmmdd-mmmdd

Hol 10=mmmdd-mmmdd

Hol 11=mmmdd-mmmdd

Hol 12=mmmdd-mmmdd

Hol 13=mmmdd-mmmdd

Hol 14=mmmdd-mmmdd

Hol 15=mmmdd-mmmdd

Hol 16=mmmdd-mmmdd

Htg Zero OAT= 0°F

Clg Rate= 0.4°F/min

Clg OAT= 85°F

Clg Zero OAT= 100°F

Unit Configuration

AHU ID= _____

CompB1 ID= _____

CompB2 ID= _____

GenCB ID= _____

HtgB ID= _____

ERecB ID= _____

KP ID= _____

Calibrate Mode= No

Space Sensor= Yes

EFT Sensor= No

ERecovery= xxxxx hr

Time/Date

Economizer Setup

Clg Propbd= 30°F

Clg IntTime= 60sec

Clg Period= 30sec

Compressor Setup

Lead Circuit= #1

Comp Ctrl= Cross Circ

Cond Fan1 Spt= 0°F

Cond Fan2 Spt= 55°F

Cond Fan3 Spt= 65°F

Cond Fan4 Spt= 75°F

Cond Fan Diff= 10°F

Stage Time= 5min

DesignFlow Setup

Wait Time= 30sec

Heating Setup

Stage Time= 5min

F&BP Ctrl= OpenValve

F&BP Chgovr= 37°F

Modband= 50%

Max Step= 5.0%

Deadband= 6.0%

LH Flow= xxx.xx%

RH Flow= xxx.xx%

Bldg Static P Setup

BSP Propbd= 1.0"WC

BSP IntTime= 10sec

BSP Period= 5sec

Zone Temp Setup

Clg IntTime= 700sec

Period= 60sec

Clg Propbd= 8.0°F

Spt Source= Keypad

Htg Propbd= 12.0°F

Htg IntTime= 500sec

Chilled Water Setup

Clg Propbd= 30°F

Clg IntTime= 60sec

Clg Period= 30sec

Stage Time= 5min Htg Propbd= 20°F

Htg IntTime= 120sec

Htg Period= 60sec

Sub Menus (Continued)

Dehum Setup

Dehum Ctrl= Occupied

Minimum Stages= 2

Manual Control

Manual Control= No

Discharge Fan= Off

RF/EF Fan= Off

Fan Operation= Off

Alarm= Normal

OA Damper= Auto

Mod Cooling= Auto

Mod Heating= Auto

Energy Recovery Setup

EWhl Propbd= 30°F

EWhl IntTime= 100sec

EWhl Period= 30sec Maximum Stages= 4

Sensor Loc= Return

DH Stage Time= 10min

RF/EF Vanes= Auto

RF/EF VFD= Auto

OM 138 9

Figure2: Keypad Accessible Menu Structure (Continued)

OA Dmpr Stuck= Off

Airflow Switch= Off

Dirty Filter= Off

Dirty FnlFltr= Off

Ckt1 H/W= Off

Ckt2 H/W= Off

Active Alarm 1

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Freeze= Fast

Smoke= Fast

Space Sensor= Fast

Return Sensor= Fast

Disch Sensor= Fast

Alarm Out Faults

Hi Return Temp= Fast

Hi Disch Temp= Fast

Lo Disch Temp= Fast

Fan Fail= Fast

OA Dmpr Stuck= Fast

Freeze= Slow

OAT Sensor= Slow

Space Sensor= Slow

Return Sensor= Slow

Ent Fan Sens= Slow

Lo Airflow= Slow

Alarm Out Problems

Heat Fail= Slow

Fan Retry= Slow

Hi Press-Ckt1= Slow

Hi Press-Ckt2= Slow

Lo Press-Ckt1= Slow

Lo Press-Ckt2= Slow

Frost-Ckt1= Slow

Frost-Ckt2= Slow

Comp #1 Alm= Slow

Comp #2 Alm= Slow

Comp #3 Alm= Slow

Comp #4 Alm= Slow

PumpDown-Ckt1= Slow

PumpDown-Ckt2= Slow

Ckt1 Clg Ena= Slow

Ckt2 Clg Ena= Slow

GenC Clg Ena= Slow

HtgB Htg Ena= Slow

Ckt1 Comm Fail= Slow

Ckt2 Comm Fail= Slow

Genc Comm Fail= Slow

HtgB Comm Fail= Slow

ERecB Comm Fail= Slow

Alarm Out Warnings

GenC H/W= Off

HtgB H/W= Off

Active Alarm 2

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Active Alarm 3

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Active Alarm 4

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Previous Alarm 1

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Previous Alarm 2

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Previous Alarm 3

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Previous Alarm 4

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Previous Alarm 5

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Previous Alarm 6

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Previous Alarm 7

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Previous Alarm 8

Alarm Name

Alarm Type

dd-mmm-yy hh:mm:ss

Sub Menus (Continued)

Alarm Limits

Hi Disch Alm= 170°F

Lo Disch Alm= 40°F

Hi Return Alm= 120°F

10 OM 138

Display Format

The information stored in the MicroTech II controller menu

structure can be viewed on the 4-line by 20-character LCD

display. The current menu is displayed on the top line and up

to three menu items are displayed on the next three lines

(refer to Figure 3). The item lines contain one or more data

fields that convey varying information. A blinking cursor

indicates the current item. There is a “navigation” indicator

on the right side of the top line while in navigation mode.

A symbol indicates there are more items in the menu

“above” the current display window. A symbol indicates

there are more items in the menu “below” the current display

window. A symbol indicates there are more items in the

menu “above” and “below” the current display window.

Figure 3: LCD Display Format

Password Protection

The MicroTech II controller includes password protection to

guard against inadvertent control parameter changes. When

an attempt is made to change the value of an adjustable

parameter with the keypad, the controller prompts the user to

enter either the level 2 (L-2) or level 1 (L-1) password

depending on the level required for that particular parameter.

The L-2 password is 4545. The L-1 password is 6555.

Note: L-2 has a “higher” level of authority than L-1. The

controller prompts for the password by displaying

the following:

Figure 4: Password Protection

The password fields initially has values off 5555 in them.

The first field is blinking. For example, to change the pass-

word to 4545 and enter the new value, the following proce-

dure is used:

1. Pressing the Down Arrow (-) key one time decrements

the first field (blinking) to a value of 4.

2. Pressing the Right Arrow key one time moves the blink-

ing cursor to the second field.

3. Again pressing the Right Arrow key one time (the sec-

ond field will not be changed in this example) moves the

blinking cursor to the third field.

4. Pressing the Down Arrow (-) key one time decrements

the third field (now blinking) to a value of 4.

5. Now the four fields should be 4545, the desired pass-

word. Pressing the Enter/Save key enters the password.

If the correct password is entered, the display returns to the

item to be changed and the changeable item field is blinking

waiting to be modified.

Password Timeout

Once the password is entered, the controller allows further

changes without prompting the user to enter a password until

either the password timer expires or a different password

level is required for the particular parameter to be changed.

The password timer is adjustable from 2-60 minutes using

the Timeout= parameter in the Passwords menu.

Clear Alarm Password

Normally clearing an active alarm does not require a pass-

word entry. This is true if the Clear Alarm= item in the Pass-

words menu is set to “None.” However, if this parameter is

set to “L-1” the controller prompts the user to enter the level

1 password before an alarm can be cleared. If this parameter

is set to “L-2” the controller prompts the user to enter the

level 2 password before an alarm can be cleared. For details

regarding alarm clearing, refer to “Keypad/Display Exer-

cises” on page 11.

Temperatures

Disch Air=55.0°F

Return Air=73.5°F

Space Temp=74.5F

Navigation Indicator

Data Field

Blinking Cusor

Menu Line

Item Line

**Enter L-2 Password

Password= 5555

Blinking Data Field

OM 138 11

Keypad Functions

The MicroTech II controller keypad consists of 8 pressure

sensitive membrane switches. Refer to Figure 1 on page 6.

The following are descriptions of these keys and their

functions.

Left Arrow Key:

Pressing this key changes the displayed menu one menu to

the left while navigating within the menu structure. It also

changes the field to be edited one field to the left while edit-

ing a parameter value.

Right Arrow Key:

Pressing this key changes the displayed menu one menu to

the right while navigating within the menu structure. It also

changes the field to be edited one field to the right while

editing a parameter value.

Up Arrow (+) Key:

Pressing this key changes the displayed menu or menu item

up one menu or menu item while navigating within the menu

structure. It also increments a changeable parameter one

value while editing.

Down Arrow (-) Key:

Pressing this key changes the displayed menu or menu item

down one menu or menu item while navigating within the

menu structure. It also decrements a changeable parameter

one value while editing.

Back/Cancel Key:

Pressing this key while navigating within the menu structure

changes the displayed menu back to the main menu. While

editing a changeable parameter, pressing this key causes the

edit session to be terminated and the parameter value reverts

to the value it had before beginning the editing session.

Pressing this key after having pressed the Alarm key to view

an active alarm causes the display to revert to the menu that

was in the display prior to pressing the Alarm key. Pressing

this key while at the main menu causes a manual password

log off and resets the password timer.

Enter/Save Key:

Pressing this key while viewing a menu on the main menu

changes the displayed menu to the first menu of the menu

group or category associated with that menu. Pressing this

key while viewing a changeable menu item places the key-

pad into “edit” mode. The first changeable field for that

parameter begins blinking and the top line of the display is

replaced with **Edit Mode, indicating the “edit” mode is

activated. Once a parameter is changed in “edit” mode,

pressing this key “saves” the new parameter value into mem-

ory. When the new parameter value is saved, the changeable

field or field stops blinking and the **Edit Mode message

disappears from the top line of the display, indicating the

keypad is no longer in “edit” mode.

Alarm Key:

Pressing this key while the red LED above it on the keypad

is blinking changes the displayed menu to the Active Alarm

1 menu.

Clear Alarm Key:

Pressing this key while any of the active alarm menus are

being displayed sends a clear command to clear the alarm.

Keypad/Display Exercises

The following are three exercises that serve as a guide

through some typical keypad operations. Note that often

there is more than one way to perform an operation.

Changing Set Points

In this exercise, assume that the current minimum outdoor

air damper position set point is 15%. Using the following

procedure, the set point is changed to 10%.

1. Pressing the Back/Cancel key changes the display back

to the main menu if not already there.

12 OM 138

2. Assuming the blinking cursor is positioned on the Sys-

tem Summary menu, pressing the Down Arrow (-) key

twice changes the cursor position to the Temperature

menu.

3. Pressing the Enter/Save key changes the display to the

Zone Cooling menu, the first menu in the Temperatures

group of menus.

4. Pressing the Right Arrow key three times changes the

display to the OA Damper menu. The cursor is posi-

tioned on the first item within this menu which is the OA

Damper Pos= item.

5. Pressing the Down Arrow (-) key six times moves the

display down six items in the menu and positions the

cursor on the MinOA Pos= item.

6. When the Enter/Save key is pressed and if the password

timer has expired since the last time the password was

entered, the controller prompts the user to enter a pass-

word at this point. The procedure outlined above in

“Password Protection” on page 10 must be followed to

enter the password. Once the password has been suc-

cessfully entered, the display enters the “edit” mode as

show below.

When the Enter/Save key is pressed and if a password

entry is not required, the display simply enters the “edit”

mode as shown below.

Note: The Menu Line has been replaced by the “**Edit

Mode” indication message, the cursor has disap-

peared and the date field to be edited is blinking.

7. Pressing the Down Arrow (-) key once decrements the

current MinOA Pos= value by one percent. Pressing and

holding the Down Arrow (-) causes the value to decre-

ment rapidly.

8. When the MinOA Pos= parameter is at the desired value

(10% in this example), pressing the Enter/Save key

stores the new setting and terminates the edit session.

Note: The data field stops blinking when the new value is

recorded and the display leaves the “edit” mode.

Clearing Alarms

In this exercise, assume that a “fault” alarm exists. This type

of alarm shuts down the unit and keeps it off until the alarm

is manually cleared. If the conditions that caused the alarm

have been corrected, the following procedure is used to clear

a fault.

1. Pressing the Alarm key while the red LED on the key-

pad is blinking (indicating an active alarm condition)

changes the displayed menu to the Active Alarm 1 menu

which displays the current highest priority alarm.

2. Pressing the Clear Alarm key sends a clear command to

the controller. This clears the alarm and returns the unit

to normal operation.

Modifying Schedules

In this exercise, assume that a change in building occupancy

requires the rooftop unit to run from 8:30 a.m. to 5:30 p.m.

on Sunday. The current schedule has the unit shut down on

Sunday. Using the following procedure, this schedule is

changed accordingly. This procedure assumes that the pass-

word has previously been entered and the password timer

has not expired.

Note: The time schedule and time clock in the MicroTech

II controller use “military” time. In this case 5:30

p.m. is equivalent to 17:30 in “military” time.

1. Pressing the Back/Cancel key changes the display to

back to the main menu if not already there.

**Edit Mode

MinOA Pos= 15%

MinOA Type= None

DesignFlow= No

Menu Line

Item Line Being Edited

Blinking Data Field

OM 138 13

2. Assuming the blinking cursor is positioned on the Sys-

tem Summary menu, pressing the Down Arrow (-) key

three times changes the cursor position to the Schedules

menu.

3. Pressing the Enter/Save key changes the display to the

Daily Schedule menu, the first menu in the Schedules

group of menus.

4. Pressing the Down Arrow (-) key six times moves the

display down six items in the menu and positions the

cursor on the Sun= item.

5. When the Enter/Save key is pressed (and if a password

entry is not required) the display enters the “edit” mode

with the “start hour” data field blinking.

6. Pressing the Up Arrow (+) key once increments the cur-

rent “start hour” value by one hour. Pressing and hold-

ing the Up Arrow (+) causes the value to increment

rapidly.

7. When the “start hour” is at the desired value (08 in this

example), pressing the Right Arrow key moves the

blinking cursor to the “start minute” field.

8. Pressing the Up Arrow (+) key once increments the cur-

rent “start minute” value by one minute. Pressing and

holding the Up Arrow (+) causes the value to increment

rapidly.

9. When the “start minute” is at the desired value (30 in

this example), pressing the Right Arrow key moves the

blinking cursor to the “stop hour” field.

10. Pressing the Up Arrow (+) key once increments the cur-

rent “stop hour” value by one hour. Pressing and holding

the Up Arrow (+) causes the value to increment rapidly.

11. When the “stop hour” is at the desired value (17 in this

example), pressing the Right Arrow key moves the

blinking cursor to the “stop minute” field.

12. Pressing the Up Arrow (+) key once increments the cur-

rent “stop minute” value by one minute. Pressing and

holding the Up Arrow (+) causes the value to increment

rapidly.

13. When the “stop minute” is at the desired value (30 in

this example), pressing the Enter/Save key stores the

new Sun= start/stop setting and terminates the edit ses-

sion.

Note: The data field stops blinking when the new value is

recorded and the display leaves the “edit” mode.

Keypad/Display Menu Reference

The following is a brief description of each menu and menu

item within the rooftop MicroTech II menu structure. Tables

are included which show every menu, item, and field in the

menu structure of the program. These menus and items can

all be displayed with the keypad/display.

Note: There are a number of instances where the same

menu item appears under more that one menu.

System Summary

Menus in the System Summary category contain basic unit

operating status and control set point parameters. Table 2 on

page 15 lists all menus and items in the System Summary

group or category. The “Range” column in the table lists all

possible values for each item. The factory settings for the

adjustable parameters are shown in the “Factory Default

Value” column. The following are brief descriptions of the

System Summary category menus and items.

System

The System menu provides a summary of basic unit status

and control items.

UnitStatus.

UnitStatus= is a status only item which indi-

cates the state in which the unit is currently operating. For

detailed information regarding this parameter, refer to

“Determining Unit Status” on page 43.

14 OM 138

Clg Capacity.

Clg Capacity= is a status only item which

indicates the percentage of the unit maximum cooling capac-

ity currently operating.

Htg Capacity.

Htg Capacity= is a status only item which

indicates the percentage of the unit maximum heating capac-

ity currently operating.

Clg Status.

Clg Status= is a status only item which indi-

cates whether or not cooling (economizer and/or mechani-

cal) is currently allowed. If cooling is disabled, the reason is

indicated. For detailed information regarding this parameter,

refer to “Determining Unit Status” on page 43.

Htg Status.

Htg Status= is a status only item which indi-

cates whether or not heating is currently allowed. If heating

is disabled, the reason is indicated. For detailed information

regarding this parameter, refer to “Determining Unit Status”

on page 43.

Ctrl Mode.

Ctrl Mode= is an adjustable item which allows

the unit to be set for manual off, cooling only, heating only,

fan only or auto heating/cooling operation. For detailed

information regarding this parameter, refer to “Auto/Manual

Operation” on page 45.

Note: If this item is set to “Auto”, then cooling only, heat-

ing only, fan only or auto heating/cooling operation

is determined by a network signal as indicated by

the Appl Mode= item.

Appl Mode.

Appl Mode= is a network adjustable item

which indicates that the unit is set for network off, cooling

only, heating only, fan only or auto heating/cooling operation

via a network signal. For detailed information regarding this

parameter, refer to “Auto/Manual Operation” on page 45.

Note: This item has no affect on the unit operation unless

the Ctrl Mode= item is set to “Auto.”

Occupancy

Menus in the Occupancy menu contain status and control

items that relate to unit occupied/unoccupied operation.

Occupancy.

Occupancy= is a status only item which indi-

cates whether the unit is currently in an occupied, unoccu-

pied, or bypass mode of operation. For detailed information

regarding this parameter, refer to “Determining Unit Status”

on page 43.

Occ Mode.

Occ Mode= is an adjustable item which allows

the unit to be set for manual occupied or unoccupied opera-

tion, automatic operation based on a time schedule input or

manual bypass operation. For detailed information regarding

this parameter, refer to “Auto/Manual Operation” on

page 45.

Occ Src.

Occ Src= is status only item which indicates the

input source or function that is responsible for setting the

Occupancy= parameter to “Occ.” For detailed information

regarding this parameter, refer to “Auto/Manual Operation”

on page 45.

Bypass Time.

Bypass Time= is an adjustable item which

indicates the bypass time remaining when the unit is operat-

ing due to bypass operation. For detailed information regard-

ing this parameter, refer to “Auto/Manual Operation” on

page 45.

Emerg Override .

Emerg Override= is an adjustable item

which provides a means off completely shutting off a unit

via a network signal. If this parameter is set to “Off” the unit

can not start based on a time clock or any other means. The

only way the unit can be started is to change this parameter

to “Norm.” For detailed information regarding this parame-

ter, refer to “Auto/Manual Operation” on page 45.

Temperatures

Menus in the Temperatures menu contain unit temperature

status information.

Control Temp.

Control Temp= is a status only item which

displays the current value of the “Control Temperature.” The

“Control Temperature” is defined as the temperature input

selected by the CtrlTemp Src= parameter in the Zone Cool-

ing or Zone Heating menu. For example, if the CtrlTemp

Src= parameter is set to “Return”, then the Control Temp=

parameter reads the same value as the Return Air= parame-

ter. For detailed information regarding this parameter, refer

to “Heat/Cool Changeover” on page 65.

Disch Air.

Disch Air = is a status only item which displays

the current temperature reading from the unit discharge air

temperature sensor. This sensor is standard on all units.

Return Air.

Return Air= is a status only item which dis-

plays the current temperature reading from the unit return air

temperature sensor. This sensor is standard on all units with

return air.

Space Temp.

Space Temp= is a status only item which dis-

plays the current space (or zone) temperature reading from

the optional unit space air temperature sensor input. Refer to

“Zone (Space) Temperature Sensor” on page 56.

Note: If an optional space temperature sensor is not

installed, the Space Sensor= item in the Unit Con-

figuration menu should be set to “No” to disable the

alarm function associated with an open circuit at the

space temperature sensor input.

OA Temp.

OA Temp= is a status only item which displays

the current temperature reading from the unit mounted out-

door air temperature sensor. This sensor is standard on all

units.

Ent Fan.

Ent Fan= is a status only item which displays the

current temperature reading from the unit entering fan air

temperature sensor. This sensor is standard on all units

equipped with gas or electric heat.

OM 138 15

Table 2: System Summary Menus

Menu Name Menu Item Name Factory Default Value Field Number Range

System

UnitStatus - -

Off Unoc

Off Man

Off Net

Off Sw

Off Alm

Calib

Startup

Recirc

Fan Only

Econo

Cooling

MWU

Heating

Min DAT

UnocEcon

UnocClg

UnocHtg

Man Ctrl

Clg Capacity - - 0-100%

Htg Capacity - - 0-100%

Clg Status - -

All Clg

Econo

Mech Clg

Off Amb

Off Alm

Off None

Off Sw

Off Net

Off Man

Htg Status - -

Htg Ena

Off Amb

Off Alm

Off None

Off Sw

Off Net

Off Man

Ctrl Mode Auto 1

Off

Auto

Heat/Cool

Heat Only

Cool Only

Fan Only

Appl Mode Heat/Cool 1

Off

Heat/Cool

Heat Only

Cool Only

Fan Only

16 OM 138

Airflow

Menus in the Airflow category contain status and control set

point parameters that define the airflow control setup of the

unit. Table 3 on page 17 lists all menus and items in the Air-

flow group or category. The “Range” column in the table

lists all possible values for each item. The factory settings

for the adjustable parameters are shown in the “Factory

Default Value” column. The following are brief descriptions

of the Airflow category menus and items.

Airflow Summary

The Airflow Summary menu contains status information

related to unit airflow, static pressure and fan operation.

Flow Status.

Flow Status= is a status only item that indi-

cates whether or not discharge airflow is detected. Airflow

status is sensed by a binary input delivered to the controller

by a differential pressure switch (PC7).

Disch Fan.

Disch Fan= is a status only item which indi-

cates whether or not the controller is commanding the unit

discharge fan on.

RF/EF Fan.

RF/EF Fan= is a status only item which indi-

cates whether or not the controller is commanding the unit

return or exhaust on.

Fan Operation.

Fan Operation= is a status only item

which indicates the on/off status of the Fan Operation Output

(MCB-BO3). For details regarding the Fan Operation Out-

put, refer to the “Field Output Signals” section of IM 696,

MicroTech Applied Rooftop Unit Controller.

Bldg Pressure

The Bldg Pressure menu contains parameters for controlling

building static pressure when a unit is equipped with a build-

ing static pressure sensor. For detailed information regarding

building static pressure control, refer to “Direct Building

Static Pressure Control” on page 88 or “Exhaust Fan Con-

trol” on page 87.

Bldg Press.

Bldg Press= is a status only item which indi-

cates the current pressure at the building static pressure sen-

sor location.

BldgSP Spt.

BldgSP Spt= is an adjustable item which sets

the building static pressure set point used for controlling the

return air or exhaust fan inlet vanes or VFD. The inlet vanes

or VFD is modulated to maintain the building static pressure

sensor input at this set point.

BSP Db.

BSP Db= is an adjustable item which sets a dead

band around the BldgSP Spt= parameter in the Bldg Static

Pressure menu. No building static pressure control action is

taken when the current building static pressure input is

within this dead band.

RF/EF Fan Cap.

RF/EF Fan Cap= is a status only item

which indicates the current return or exhaust fan capacity. 0-

100% inlet vane position is indicated if the unit is equipped

with return or exhaust fan variable inlet vanes. 0-100% of

VFD maximum speed is indicated if the unit is equipped

with a return or exhaust fan VFD

Occupancy

Occupancy - -

Occ

Unocc

Bypass

Occ Mode Auto 1

Occ

Unocc

Bypass

Auto

Occ Src - -

None

Int Sched

Net Sched

Occ Mode

Remote Sw

Bypass Time 0 min 1 0 -300 min

Emerg Override Norm 1

Norm

Off

Temperatures

Control Temp - - -50 - 250.0 °F

Disch Air - - -50 - 250.0 °F

Return Air - - -50 - 250.0 °F

Space Temp - - -50 - 250.0 °F

OA Temp - - -50 - 250.0 °F

Ent Fan - - -50 - 250.0 °F

Table 2: System Summary Menus (Continued)

Menu Name Menu Item Name Factory Default Value Field Number Range

OM 138 17

Temperature

Menus in the Temperature category contain status and con-

trol set point parameters that define the temperature control

setup of the unit. Table 4 on page 22 lists all menus and

items in the Temperature group or category. The “Range”

column in the table lists all possible values for each item.

The factory settings for the adjustable parameters are shown

in the “Factory Default Value” column. The following are

brief descriptions of the Temperature category menus and

items.

Zone Cooling

The Zone Cooling menu primarily contains basic status and

control parameters that relate to or affect the unit changeover

into cooling operation and control of the space or zone tem-

perature while in cooling operation. For detailed information

regarding unit heating/cooling changeover, refer to

“Heat/Cool Changeover” on page 65.

Control Temp.

Control Temp= is a status only item which

displays the current value of the “Control Temperature.” The

“Control Temperature” is defined as the temperature input

selected by the CtrlTemp Src= parameter in the Zone Cool-

ing or Zone Heating menu. For example, if the CtrlTemp

Src= parameter is set to “Return”, then the Control Temp=

parameter reads the same value as the Return Air= parame-

ter. For more information regarding this parameter, refer

to“Heat/Cool Changeover” on page 65.

Clg Capacity.

Clg Capacity= is a status only item which

indicates the percentage of the unit maximum cooling capac-

ity currently operating.

Eff Clg Spt.

Eff Clg Spt= is a status only item which indi-

cates the cooling changeover or zone cooling control set

point currently in effect. When the current value of the Con-

trol Temp= parameter rises above this parameter by more

than half the Clg Deadband= parameter, cooling capacity is

increased. When the current value of the Control Temp=

parameter drops below this parameter by more than half the

Clg Deadband= parameter cooling capacity is decreased.

This parameter is either set by the controller to same value as

the Occ Clg Spt= parameter or based on a signal from an

optional space temperature sensor with set point adjustment

capability. For details regarding the use of thermostat sup-

plied set points, refer to “Tstat Source Set Points” on

page 66.

Occ Clg Spt.

Occ Clg Spt= is an adjustable item used by

the controller to set the Eff Clg Spt= parameter. The Eff Clg

Spt= is set to this value when it is not being set based on a

signal from an optional space temperature sensor with set

point adjustment capability. For details regarding the use of

thermostat supplied set points, refer to “Tstat Source Set

Points” on page 66.

Clg Deadband.

Clg Deadband= is an adjustable item

which sets a dead band around the Eff Clg Spt= parameter.

For example, if the Eff Clg Spt= parameter is set to 75ºF and

the Clg Deadband= parameter is set to 2ºF the dead band

around the set point would be from 76.0ºF to 74.0ºF.

CtrlTemp Src.

CtrlTemp Src= is an adjustable item which

selects the temperature sensor input to be used for the unit

heating/cooling changeover or zone cooling and heating

capacity change decisions. For example, if the CtrlTemp

Src= parameter is set to “Return”, then the Control Temp=

parameter reads the same value as the Return Air= parame-

ter. For detailed information regarding this parameter, refer

to “Heat/Cool Changeover” on page 65.

Space Temp.

Space Temp= is a status only item which dis-

plays the current space (or zone) temperature reading from

Table 3: Airflow Menus

Menu Name Menu Item Name Factory Default Value Field Number Range

Airflow Summary

Flow Status - -

Flow

NoFlow

Disch Fan - -

Off

RF/EF Fan - -

Off

Fan Operation - -

Off

Bldg Pressure

Bldg Press - - -0.250 - 0.250 “WC

BldgSP Spt 0.050 “WC 1 -0.250 - 0.250 “WC

BSP Db 0.010 “WC 1 0.001-0.100 “WC

RF/EF Fan Cap - - 0 - 100%

a. The items in this menu apply to units configured for direct building pressure control of return air fan inlet vanes or VFD or units equipped with an energy recovery wheel

option.

18 OM 138

the optional unit space air temperature sensor input. Refer to

“Zone (Space) Temperature Sensor” on page 56.

Note: If an optional space temperature sensor is not

installed, the Space Sensor= item in the Unit Con-

figuration menu should be set to “No” to disable the

alarm function associated with an open circuit at the

space temperature sensor input.

UnoccClg Spt.

UnoccClg Spt= is an adjustable item

which sets the point at which the unit starts up and provides

unoccupied cooling (night setup) during unoccupied periods.

For detailed information regarding unoccupied cooling oper-

ation, refer to “Unoccupied Cooling (Night Setup)” on

page 90.

Note: An optional space temperature sensor is required

for unoccupied cooling operation.

UnoccClgDiff.

UnoccClgDiff= is an adjustable item which

sets a differential above the UnoccClg Spt= parameter. Once

activated, unoccupied cooling operation is terminated when

the Space Temp= value falls below the UnoccClg Spt= set-

ting by more than this differential.

Clg Status.

Clg Status= is a status only item which indi-

cates whether or not cooling (economizer and/or mechani-

cal) is currently allowed. If cooling is disabled, the reason is

indicated. For detailed information regarding this parameter,

refer to “Determining Unit Status” on page 43.

OATComp Lock.

OATComp Lock= is an adjustable item

which sets the low outdoor air temperature mechanical cool-

ing lockout point. Compressor operation is disabled when

the outdoor air temperature sensor input falls below this set

point.

OATLock Diff.

OATLock Diff= is an adjustable item which

sets a differential above the OATComp Lock= parameter.

Compressor operation is re-enabled when the outdoor air

temperature sensor input rises above the OATComp Lock=

value by more than this differential.

Zone Heating

The Zone Heating menu primarily contains basic status and

control parameters that relate to or affect the unit changeover

into heating operation and control of the space or zone tem-

perature while in heating operation. For detailed information

regarding unit heating/cooling changeover, refer to

“Heat/Cool Changeover” on page 65.

Control Temp.

Control Temp= is a status only item which

displays the current value of the “Control Temperature.” The

“Control Temperature” is defined as the temperature input

selected by the CtrlTemp Src= parameter in the Zone Cool-

ing or Zone Heating menu. For example, if the CtrlTemp

Src= parameter is set to “Return”, then the Control Temp=

parameter reads the same value as the Return Air= parame-

ter. For detailed information regarding this parameter, refer

to “Heat/Cool Changeover” on page 65.

Htg Capacity.

Htg Capacity= is a status only item which

indicates the percentage of the unit maximum heating capac-

ity currently operating.

Eff Htg Spt.

Eff Htg Spt= is a status only item which indi-

cates the heating changeover or zone heating control set

point currently in effect. When the current value of the Con-

trol Temp= parameter, falls below this parameter by more

than half the Htg Deadband= parameter, heating capacity is

increased. When the current value of the Control Temp=

parameter rises above this parameter by more than half the

Htg Deadband= parameter heating capacity is decreased.

This parameter is either set by the controller to same value as

the Occ Htg Spt= parameter or based on a signal from an

optional space temperature sensor with set point adjustment

capability. For details regarding the use of thermostat sup-

plied set points, refer to “Tstat Source Set Points” on

page 66.

Occ HtgSpt.

Occ Htg Spt= is an adjustable item used by

the controller to set the Eff Htg Spt= parameter. The Eff Htg

Spt= is set to this value when it is not being set based on a

signal from an optional space temperature sensor with set

point adjustment capability. For details regarding the use of

thermostat supplied set points, refer to “Tstat Source Set

Points” on page 66.

Htg Deadband.

Htg Deadband= is an adjustable item

which sets a dead band around the Eff Htg Spt= parameter.

For example, if the Eff Htg Spt= parameter is set to 70ºF and

the Htg Deadband= parameter is set to 2ºF the dead band

around the set point would be from 68.0ºF to 72.0ºF.

CtrlTemp Src.

CtrlTemp Src= is an adjustable item which

selects the temperature sensor input to be used for the unit

heating/cooling changeover or zone cooling and heating

capacity change decisions. For example, if the CtrlTemp

Src= parameter is set to “Return”, then the Control Temp=

parameter reads the same value as the Return Air= parame-

ter. For detailed information regarding this parameter, refer

to “Heat/Cool Changeover” on page 65.

Space Temp.

Space Temp= is a status only item which dis-

plays the current space (or zone) temperature reading from

the optional unit space air temperature sensor input. Refer to

“Zone (Space) Temperature Sensor” on page 56.

Note: If an optional space temperature sensor is not

installed, the Space Sensor= item in the Unit Con-

figuration menu should be set to “No” to disable the

alarm function associated with an open circuit at the

space temperature sensor input.

UnoccHtg Spt.

UnoccHtg Spt= is an adjustable item

which sets the point at which the unit starts up and provides

unoccupied heating (night setback) during unoccupied peri-

ods. For detailed information regarding unoccupied heating

operation, refer to “Unoccupied Heating (Night Setback)” on

page 89.

OM 138 19

Note: An optional space temperature sensor is required

for unoccupied heating operation.

UnoccHtgDiff.

UnoccHtgDiff= is an adjustable item which

sets a differential above the UnoccHtg Spt= parameter. Once

activated, unoccupied heating operation is terminated when

the Space Temp= value rises above the UnoccHtg Spt= set-

ting by more than this differential.

Htg Status.

Htg Status= is a status only item which indi-

cates whether or not heating is currently allowed. If heating

is disabled, the reason is indicated.

OATHtg Lock.

OATHtg Lock= is an adjustable item which

sets the high outdoor air temperature heating lockout point.

Heating operation is disabled when the outdoor air tempera-

ture sensor input rises above this set point.

OATLock Diff.

OATLock Diff= is an adjustable item which

sets a differential below the OATHtg Lock= parameter. Heat-

ing operation is re-enabled when the outdoor air temperature

sensor input below the OATHtg Lock= value by more than

this differential.

Discharge Cooling

The Discharge Cooling menu contains parameters that relate

to or are used to maintain the discharge temperature when

the unit is changed over into cooling operation. For detailed

information regarding cooling operation, refer to “Heat/Cool

Changeover” on page 65, “Economizer” on page 68, “Cool-

ing: Multistage” on page 72, and “Cooling: Modulating” on

page 77, as applicable.

Disch Air.

Disch Air = is a status only item which displays

the current temperature reading from the unit discharge air

temperature sensor. This sensor is standard on all units.

Clg Capacity.

Clg Capacity= is a status only item which

indicates the percentage of the unit maximum cooling capac-

ity currently operating.

Eff Clg Spt.

Eff Clg Spt= is a status only item which indi-

cates the cooling discharge air temperature set point cur-

rently in effect during the Econo operating state or during the

Cooling operating state when the unit is equipped with

chilled water cooling. Economizer dampers or the chilled

water valve is modulated to maintain the unit discharge air

temperature at this set point. This Eff Clg Spt= parameter is

raised and lowered by the controller as necessary to maintain

the Eff Clg Spt= in the Zone Cooling menu. For detailed

information regarding economizer and chilled water cooling

operation, refer to“Economizer” on page 68 or “Cooling:

Modulating” on page 77.

Clg Db.

Clg Db= is an adjustable item which sets a dead

band around the Eff Clg Spt= parameter. For example, if the

Eff Clg Spt= parameter is set to 55ºF and the Clg Db=

parameter is set to 1ºF the dead band around the set point

would be from 55.5ºF to 54.5ºF.

Min Clg Spt.

Min Clg Spt= is an adjustable item which sets

a minimum cooling discharge temperature set point used by

the controller to limit the discharge air temperature while

controlling the space or zone conditions. For detailed infor-

mation on discharge air temperature control, refer to “Econo-

mizer” on page 68, “Cooling: Multistage” on page 72 or

“Cooling: Modulating” on page 77 as applicable.

Max Clg Spt.

Min Clg Spt= is an adjustable item which

sets a maximum cooling discharge temperature set point

used by the controller to limit the discharge air temperature

while controlling the space or zone conditions. For detailed

information on discharge air temperature control, refer to

“Economizer” on page 68, “Cooling: Multistage” on page 72

or “Cooling: Modulating” on page 77 as applicable.

OA Damper

The OA Damper menu contains parameters that relate to or

are used to control the unit outdoor air dampers. For detailed

information regarding outdoor air damper control, refer to

“0-30% Outdoor Air Damper Control” on page 68, “100%

Outdoor Air Damper Control” on page 68, or “Economizer”

on page 68, as applicable.

OA Damper Pos.

OA Damper Pos= is a status only item

which indicates the current outdoor air damper position.

Eff Min OA Pos.

Eff Min OA Pos= is a status only item

which indicates the minimum outdoor air minimum position

set point currently in effect. Economizer dampers are con-

trolled to maintain this position whenever minimum ventila-

tion is required. For detailed information regarding

minimum ventilation control, refer to “Minimum Ventilation

Control” on page 68 (0-30% outdoor air units) or “Minimum

Ventilation Control” on page 70 (economizer units) as

applicable.

OA Flow.

OA Flow= is a status only item which indicates

the current outdoor airflow based on an optional OA airflow

sensor input used when the unit is equipped the DesignFlow

OA control feature.

OA Ambient.

OA Ambient= is a status only item which

indicates whether or not the outdoor air is suitable for free

cooling. If it is, “Low” is displayed. If not, “High” is dis-

played. The free cooling decision can be based on either an

enthalpy switch input to the controller or on a dry bulb OA

temperature set point. This decision is made via the EconCh-

govr= parameter. For detailed information regarding econo-

mizer changeover operation refer to “Economizer

Changeover Method” on page 69.

MinOA Type.

MinOA Type= is an adjustable item used to

select between a fixed damper position and one of three

available methods of automatically resetting the Eff Min OA

Pos= parameter.

Note: If the unit is equipped with the DesignFlow outdoor

air measuring system and the DesignFlow= param-

eter is set to “Yes”, the MinOA Type= parameter

automatically reverts to “None”.

For detailed information regarding minimum ventilation

control, refer to “Minimum Ventilation Control” on page 68

20 OM 138

(0-30% outdoor air units) or “Minimum Ventilation Control”

on page 70 (economizer units) as applicable.

DesignFlow.

DesignFlow= is an adjustable item used to

turn the optional DesignFlow outdoor airflow measuring

reset function on and off. This is one of several available

methods of automatically resetting the Eff Min OA Pos=

parameter. For detailed information regarding minimum

ventilation control, refer to “Minimum Ventilation Control”

on page 70.

MinOA Pos.

MinOA Pos= is an adjustable item used by the

controller to set the Eff Min OA Pos= parameter. When the

Eff Min OA Pos= parameter is not being set based on one of

the possible outdoor damper position reset functions, it is set

to the MinOA Pos= value. For detailed information regard-

ing minimum ventilation control, refer to “Minimum Venti-

lation Control” on page 68 (0-30% outdoor air units) or

“Minimum Ventilation Control” on page 70 (economizer

units) as applicable.

MinOA Flow.

MinOA Flow= is an adjustable item used by

the controller to set the Eff Min OA Pos= parameter when

the unit is equipped with the optional DesignFlow OA con-

trol feature. When the DesignFlow= parameter is set to

“Yes”, the Eff Min OA Pos= is reset to maintain the OA

Flow= value at the MinOA Flow= setting. For detailed infor-

mation regarding minimum ventilation control, refer to

“Minimum Ventilation Control” on page 70.

MinOA @Max Sig.

MinOA @Max Sig= is an adjustable

item used to set the Eff Min OA Pos= when the MinOA

Type= is set to “Ext mA” or “Ext V.” When either “Ext mA”

or “Ext V” is selected, the Eff Min OA Pos= is reset between

the MinOA Pos= value and the MinOA @Max Sig= value as

a field supplied external current or voltage signal varies

between a minimum and maximum value. For detailed infor-

mation regarding minimum ventilation control, refer to

“Minimum Ventilation Control” on page 68 (0-30% outdoor

air units) or “Minimum Ventilation Control” on page 70

(economizer units) as applicable.

Min Signal.

Min Signal= is an adjustable item used to

define the minimum value of the field supplied current or

voltage signal used to adjust the Eff Min OA Pos= when the

MinOA Type= is set to “Ext mA” or “Ext V.” Min Signal= is

adjustable from 0-100%. When “Ext mA” is selected, 0-

100% refers to 0-100% of 20mA. When “Ext V” is selected,

0-100% refers to 0-100% of 10VDC. For detailed informa-

tion regarding minimum ventilation control, refer to “Mini-

mum Ventilation Control” on page 68 (0-30% outdoor air

units) or “Minimum Ventilation Control” on page 70 (econo-

mizer units) as applicable.

Max Signal.

Max Signal= is an adjustable item used to

define the maximum value of the field supplied current or

voltage signal used to adjust the Eff Min OA Pos= when the

MinOA Type= is set to “Ext mA” or “Ext V.” Max Signal= is

adjustable from 0-100%. When “Ext mA” is selected, 0-

100% refers to 0-100% of 20mA. When “Ext V” is selected,

0-100% refers to 0-100% of 10VDC. For detailed informa-

tion regarding minimum ventilation control, refer to “Mini-

mum Ventilation Control” on page 68 (0-30% outdoor air

units) or “Minimum Ventilation Control” on page 70 (econo-

mizer units) as applicable.

MinOA ResetMax.

MinOA ResetMax= is an adjustable

item which sets a maximum value to which the Eff Min OA

Pos= parameter can be set. When reset by any of the possi-

ble methods, the Eff Min OA Pos= parameter varies between

the Min OA Pos= and the MinOA ResetMax= value. For

detailed information regarding minimum ventilation control,

refer to “Minimum Ventilation Control” on page 68 (0-30%

outdoor air units) or “Minimum Ventilation Control” on

page 70 (economizer units) as applicable.

Max Fan Diff.

Max Fan Diff= is an adjustable item which

sets a differential between the discharge and return fan

capacities above which the Eff Min OA Pos= parameter is

reset to the MinOA ResetMax= value. As the difference

between the discharge and return fan capacities varies

between the Min Fan Diff= and Max Fan Diff= values, the

Eff Min OA Pos= parameter varies between the MinOA

Pos= and the MinOA ResetMax= value. For detailed infor-

mation regarding minimum ventilation control, refer to

“Minimum Ventilation Control” on page 70.

Min Fan Diff.

Min Fan Diff= is an adjustable item which

sets a differential between the discharge and return fan

capacities above which the Eff Min OA Pos= parameter

begins to be reset from the MinOA Pos= value toward the

MinOA ResetMax= value. As the difference between the dis-

charge and return fan capacities varies between the Min Fan

Diff= and Max Fan Diff= values, the Eff Min OA Pos=

parameter varies between the MinOA Pos= and the MinOA

ResetMax= value. For detailed information regarding mini-

mum ventilation control, refer to “Minimum Ventilation

Control” on page 70.

Reset T Limit.

Reset T Limit= is an adjustable item which

sets a discharge air temperature low limit which overrides

functions that reset the Eff Min OA Pos= parameter if the

discharge air temperature gets too cold. For detailed infor-

mation regarding minimum ventilation control, refer to

“Minimum Ventilation Control” on page 70.

EconChgovr.

EconChgovr= is an adjustable item which

defines the method used to make the economizer changeover

decision. When EconChgovr= is set to “Enthalpy”, the econ-

omizer changeover decision is based on the enthalpy switch

input to the controller. When the switch is closed, the OA

Ambient= item indicates “Low” and economizer operation is

enabled. When the switch is open, the OA Ambient= item

indicates “High” and economizer operation is disabled.

When EconChgover= is set to “Dry Bulb”, the economizer

changeover decision is based on the outdoor air temperature

compared to the EconChgovrT= item. When the outdoor air

temperature is below the EconChgovr T= value, the OA

Ambient= item indicates “Low” and economizer operation is

enabled. When the outdoor air temperature is above the

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McQuay MicroTech II Operating instructions

Brand: McQuay

Model: MicroTech II

Category: Split-system air conditioners

Type: Operating instructions

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McQuay MicroTech II Operating instructions

McQuay MicroTech II Operating instructions

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