McQuay MicroTech MAG Protocol Manual

Brand: McQuay

Model: MicroTech MAG

Category: Water heaters & boilers

Type: Protocol Manual

Open Protocol Data Information Packet

Version 2.0

Group

: Controls

Date

: January 1998

MicroTech

Absorption Chiller

Open Protocol

™

Data Communications

Proprietary Information - Subject to Change McQuay International

MicroTech Absorption Chiller Open Protocol Data Information 2

- C O N F I D E N T I

A L -

This Document may not be

copied or reproduced in any

way without the express

written consent of McQuay

International.

NOTICE

McQuay International,

Minneapolis MN

throughout the world.

McQuay International

reserves the right to change

any information contained

herein without prior notice.

No guarantees are given as to

the accuracy of information

provided.

McQuay International Proprietary Information - Subject to Change

3 MicroTech Absorption Chiller Open Protocol Data Information

Contents

Revision History ................................................................................................................................... 3

This is the first release. All information is new.Overview................................................3

Purpose.................................................................................................................................................. 4

MicroTech Absorption Gateway ..........................................................................................5

Purpose.................................................................................................................................................. 5

Components ..........................................................................................................................................5

Connecting to the MicroTech Absorption Gateway .............................................................................5

Converting between a Direct Connect and a Network MAG................................................................ 5

Diagnostic Variables ............................................................................................................................. 6

McQuay Absorption Chiller Variables .................................................................................8

Memory Map......................................................................................................................................... 8

Analog Data .......................................................................................................................................... 8

Digital Input Data................................................................................................................................ 10

Digital Output Data............................................................................................................................. 14

SW3 Status..........................................................................................................................................16

Start/Stop Data .................................................................................................................................... 17

Operating Time (Hours)...................................................................................................................... 17

Operating Time (Minutes/Seconds) .................................................................................................... 18

ID Code/PID Sampling/Data Pointer(s).............................................................................................. 19

Data Setting......................................................................................................................................... 21

Alarm Data.......................................................................................................................................... 23

Glossary of Terms ...............................................................................................................39

Index .....................................................................................................................................40

Revision History

Revisions

Version 2.0

Removed Network and Gateway diagrams which are now available in CD 573875Y, Open Protocol

Certified Drawings.

Version 1.5

This version includes the LC type absorption chiller unit.

Version 1.1

This is a formatting revision.

Version 1.0

This is the first release. All information is new.Overview

Proprietary Information - Subject to Change McQuay International

MicroTech Absorption Chiller Open Protocol Data Information 4

Purpose

The purpose of the McQuay International Open Protocol



for McQuay



absorption chillers is to

allow other automation integrators the ability to communicate with a McQuay absorption chiller.

Communications will be established through a MicroTech



interface panel that will communicate

with the McQuay Absorption Chiller. This interface panel is called the MicroTech Absorption

Gateway (MAG). Licensed BAS companies will be allowed to communicate with the MAG to

retrieve information about the McQuay absorption chiller via Open Protocol.

The results of Open Protocol can be summarized as follows:

Reading of the following Analog Information

• Chilled Water Inlet & Outlet Temperatures

• Hot Water Inlet & Outlet Temperatures

• Low & High Temperature Generator Temperatures

• Cooling Water Inlet & Outlet Temperatures

• Condensation Temperature

• Remote Reset Setting

• Exhaust Gas Temperature/Steam Condensate Temperature

• Fuel Control Valves 1 & 2 Position

• Inverter Output Signal

• Steam Control Valve Output Signal

Reading of the following Digital Output Information

• Absorbent Solution Pumps

• Refrigerant Pump

• Ignition Signal

• Heating, Cooling, Simultaneous, and Alarm Indicators

• SVRP and SVRU valves

• Cooling Main / Heating Main

Reading of the following Digital Input Information

• Alarms

• Starts/Stops of pumps and blowers

• Combustion Signal

• Remote Start/Stop Signal

Access to the absorptio

McQuay International Proprietary Information - Subject to Change

5 MicroTech Absorption Chiller Open Protocol Data Information

MicroTech Absorption Gateway

Purpose

The purpose of the MicroTech Absorption Gateway (MAG) is to read data from the McQuay

absorption chiller and store it so that automation integrators can read the status of the McQuay

absorption chiller. The automation integrators will get their data from the MAG and not directly

from the McQuay absorption chiller. The MAG continuously updates its information about the

status of the McQuay absorption chiller. All data from the MAG that comes directly from the

McQuay absorption chiller is read only; no data point can be changed through Open Protocol.

Components

This section will be used to explain the MAG hardware components. The components needed will

depend upon the number of McQuay chillers. A MAG that is in a network of two or more McQuay

Absorption Gateways and an OPM Panel will be referred to as a "Network MicroTech Absorption

Gateway." A MAG that is not in a network with an OPM Panel and other MAGs will be referred to

as "Direct Connect MicroTech Absorption Gateway". The generic name of "MicroTech Absorption

Gateway " (“MAG”) will be used when describing features that are common to both the Network

MAG and the Direct Connect MAG.

Connecting to the MicroTech Absorption Gateway

Network MAG

A Network MAG will be used whenever an Open Protocol Master (OPM) Panel is used. The OPM

provides a single communications port entry into a MicroTech network. The OPM consists of an

EnergyLine model 120 controller. The automation integrator at a licensed BAS company connects to

Comm Port A of the OPM, which is preconfigured for Open Protocol communications at 9600 baud.

Comm Port B of the OPM is a daisy chained, multidrop, 9600 baud, RS-485, proprietary McQuay

International Protocol Port. Comm Port B of the OPM will be connected to a MicroTech network.

The only way to read information from a Network MAG is through an OPM Panel. Direct

connection to a Network MAG is not possible because Comm Port B is configured for SLAVE, 9600

baud and Comm Port A, which is dedicated to receiving data from the McQuay absorption chiller, is

configured as USER, 4800 baud.

Direct Connect MAG

A Direct Connect MAG can be used whenever a single McQuay absorption chiller is used with Open

Protocol. A Direct Connect MAG cannot be used with an OPM Panel or in a MicroTech network.

A Direct Connect MAG’s Comm Port A is used to communicate with the automation integrator, and

Comm Port B is used to communicate with the Absorption Chiller Controller. Comm Port A, which

is the automation control integrator's Open Protocol communications port, is preconfigured for TTY,

Open Protocol communications at 9600 baud. Comm Port B, which is dedicated to receiving data

from the McQuay absorption chiller, is configured for USER, 4800 baud.

Converting between a Direct Connect and a Network MAG

Overview

Converting from either a Direct Connect MAG to a Network MAG or a Network MAG to a Direct

Connect MAG is done by downloading controller code to the MAG. In either case, monitor package

will be used to make the conversion.

The Network MA

Connect MAG each c

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MicroTech Absorption Chiller Open Protocol Data Information 6

Direct Connect MAG to a Network MAG

The Direct Connect MAG can be direct connected to through its Comm Port A. Once Network

MAG controller code has been downloaded, the communications lines must be changed and its

address changed to the location the controller will occupy in the MicroTech network. The

communications line that is connected to the Absorption Unit Controller must be moved from Comm

Port B to Comm Port A on the Network MAG.

Network MAG to a Direct Connect MAG

The only way to direct connect to a Network McQuay Gateway is to change the controller address to

FF and reset power. This will change Comm Port B to 9600 baud TTY and direct connection will be

possible. During this time, communications with the McQuay absorption chiller will be lost. Once

Direct Connect MAG controller code has been downloaded, the communications lines must be

changed and the address set to 00. The communications line that is connected to the Absorption Unit

Controller must be moved from Comm Port A to Comm Port B on the Direct Connect MAG.

OPM

Network

MAG

Comm Port B

McQuay

Comm Port A

Network Sanyo Gateway

Comm

Device

Comm Port A

Comm Port B

Direct

onnect

anyo

Gateway

Communications Line to Change

MAG

Absorption

Chiller

McQuay

Absorption

Chiller

Absorption

McQuay

MAG

Direct

Connect

Diagnostic Variables

Following is a list of diagnostic memory locations that can be read in the MAG.

Description Address Range Conversion

Communications Check Output

0700 0-255 See Below

Sending or Receiving Data Output

0701 0-255 See Below

Processing Data Output

0702 0-255 See Below

Processing Alarm Data Output

0703 0-255 See Below

Communications Error

040D 0, 1 0= OK

1 = Comm

Error

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7 MicroTech Absorption Chiller Open Protocol Data Information

Communications Check Output 0700

This is the memory location that contains the status of digital output 0. A 0 indicates the output is off

and a 1-255 indicates the output is on. This output is on for one second and off for one second if

communications exist between the MAG and the Absorption Unit Controller. The output is on for

two-tenths of a second and off for two-tenths of a second if communications do not exist between the

MAG and the Absorption Unit Controller. This location is a countdown timer for how long the

output has left to be on. If the location has a value of 9, the output has nine-tenths of a second left to

be on. A value of 0 means that the output is off.

Sending or Receiving Data Output 0701

This is the memory location that contains the status of digital output 1. A 0 indicates the output is off

and a 1-255 indicates the output is on. This output is on if the MAG is either sending or receiving

data to or from the Absorption Unit Controller. This output is off if the MAG is not communicating

with the Absorption Unit Controller. This output cycles off and on as the MAG communicates with

or processes data from the Absorption Unit Controller. When this output is on, the Processing Data

and Processing Alarm Data Outputs will be off. The MAG will either communicate with or process

data from the Absorption Unit Controller. Communication and processing will not occur at the same

time.

Processing Data Output 0702

This is the memory location that contains the status of digital output 2. A 0 indicates that output is

off and a 1-255 indicates the output is on. This output is on when the MAG is processing non-alarm

data it has received from the Absorption Unit Controller. Alarm data processing is indicated by

another output. This output is off if the MAG is not processing data from the Absorption Unit

Controller. This output cycles off and on as the MAG communicates with or processes data from the

Absorption Unit Controller. When this output is on, the Sending or Receiving Data and Processing

Alarm Data Outputs will be off. The MAG will either communicate with or process data form the

Absorption Unit Controller. Communication and processing will not occur at the same time.

Processing Alarm Data Output 0703

This is the memory location that contains the status of digital output 3. A 0 indicates that output is

off and a 1-255 indicates the output is on. This output is on when the MAG is processing alarm data

it has received from the Absorption Unit Controller. Non-alarm data processing is indicated by

another output. This output is off if the MAG is not processing alarm data from the Absorption Unit

Controller. This output cycles off and on as the MAG communicates with or processes data from the

Absorption Unit Controller. When this output is on, the Sending or Receiving Data and Processing

Data Outputs will be off. The MAG will either communicate with or process data form the

Absorption Unit Controller. Communication and processing will not occur at the same time.

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MicroTech Absorption Chiller Open Protocol Data Information 8

McQuay Absorption Chiller Variables

Memory Map

All of these memory locations are in the MAG. All of the following memory locations are in

hexadecimal notation. Memory location 1342 will actually be $1342 (Hexadecimal memory

location 1342).

Table Heading Definitions

Description - This is the terminology used to describe the data point.

Address - This is the memory location(s) that holds the information for the data point.

Range - This can contain either a description of the address locations or a numerical range the

location(s) will contain.

Conversion - This is how the raw data needs to be converted to get the correct data reading.

DCH - If this area contains an "X", this data point is applicable for DC-H units.

DCS - If this area contains an "X", this data point is applicable for DC-S units.

DCU - If this area contains an "X", this data point is applicable for DC-U units.

NCU - If this area contains an "X", this data point is applicable for NC-U units.

LCU - If this area contains an "X", this data point is applicable for LC-U units.

Analog Data

Description Address Range Units

Chilled Water Inlet Temperature

(Only while in Cooling or

Simultaneous units)

11B2

11B3

Hi Byte

Lo Byte

0.1*X+0=°F

X X X X X

Chilled Water Outlet Temperature

(Only while in Cooling or

Simultaneous units)

11B0

11B1

Hi Byte

Lo Byte

0.1*X+0=°F

X X X X X

Condensed Refrigerant Temperature

11C2

11C3

Hi Byte

Lo Byte

0.1*X+0=°F

X X X X X

Cooling Water Inlet Temperature

11BE

11BF

Hi Byte

Lo Byte

0.1*X+0=°F

X X X X X

Cooling Water Outlet Temperature

11C0

11C1

Hi Byte

Lo Byte

0.1*X+0=°F

X X X X X

Exhaust Gas Temperature (DC-*) or

Steam Condensate Temperature

(NC-U)

11C6

11C7

Hi Byte

Lo Byte

0.1*X+0=°F

X X X X

Fuel Control Valve 1 (%)

119A

119B

Hi Byte

Lo Byte

0.1*X+0=%

X X X

Fuel Control Valve 2 (%)

119C

119D

Hi Byte

Lo Byte

0.1*X+0=%

High Temperature Generator

Temperature

11C4

11C5

Hi Byte

Lo Byte

0.1*X+0=°F

X X X X X

Hot Water Inlet Temperature

(Only while in Heating)

11B8

11B9

Hi Byte

Lo Byte

0.1*X+0=°F

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9 MicroTech Absorption Chiller Open Protocol Data Information

Description Address Range Units

Hot Water Inlet Temperature (Only

for DC-S & DC-H units)

11BA

11BB

Hi Byte

Lo Byte

0.1*X+0=°F

X X

Hot Water Outlet Temperature

(Only while in Heating)

11B4

11B5

Hi Byte

Lo Byte

0.1*X+0=°F

Hot Water Outlet Temperature

(Only for DC-S & DC-H units)

11B6

11B7

Hi Byte

Lo Byte

0.1*X+0=°F

X X

Invertor Output Signal

119E 0-200 0.303*X+0 =Hz

X X X X X

Low Temperature Generator

Temperature

11BC

11BD

Hi Byte

Lo Byte

0.1*X+0=°F

X X X X

Remote Reset Current Signal

1196

1197

Hi Byte

Lo Byte

0.1*X+0=mA

X X X X X

Steam Control Valve Output Signal

11E0

11E1

Hi Byte

Lo Byte

0.1*X+0=%

X X

Chilled Water Inlet Temperature 11B2,11B3

This is the Chilled Water Inlet Temperature. These locations contain valid data only when the

Chiller/Heater is in the cooling mode or in the Simultaneous mode. This location is read by forming

the high byte (11B2) and the low byte (11B1) into a two byte number and dividing by 10 (0.1 * X +

0 = °F).

Chilled Water Outlet Temperature 11B0,11B1

This is the Chilled Water Outlet Temperature. These locations contain valid data only when the

Chiller/Heater is in the cooling mode or Simultaneous mode. These locations are read by forming

the high byte (11B0) and the low byte (11B1) into a two byte number and dividing by 10 (0.1 * X +

0 = °F).

Condensed Refrigerant Temperature 11C2,11C3

This is the Condensed Refrigerant Temperature. These locations are read by forming the high byte

(11C2) and the low byte (11C3) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).

Cooling Water Inlet Temperature 11BE,11BF

This is the Cooling Water Inlet Temperature. These locations are read by forming the high byte

(11BE) and the low byte (11BF) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).

Cooling Water Outlet Temperature 11C0,11C1

This is the Cooling Water Outlet Temperature. These locations are read by forming the high byte

(11C0) and the low byte (11C1) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).

Exhaust Gas Temperature/Steam Condensate Temperature 11C6,11C7

This is the Exhaust Gas (DC-H, DC-S, DC-U) or Steam Condensate Temperature (NC-U). This

location is the Exhaust Gas Temperature for DC units or the Steam Condensate Temperature for NC

units. These locations are read by forming the high byte (11C6) and the low byte (11C7) into a two

byte number and dividing by 10 (0.1 * X + 0 = °F).

Fuel Control Valve 1 Output Signal 119A,119B

This is the Fuel Control Valve 1 Feedback Signal. These locations are read by forming the high byte

(119A) and the low byte (119B) into a two byte number and dividing by 10 (0.1 * X + 0).

Fuel Control Valve 2 Output Signal 119C,119D

This is the Fuel Control Valve 2 Feedback Signal. These locations are applicable on Simultaneous

units only (DC-S). These locations are read by forming the high byte (119C) and the low byte

(119D) into a two byte number and dividing by 10 (0.1 * X + 0).

High Temperature Generator Temperature 11C4,11C5

This is the High Temperature Generator Temperature. These locations are read by forming the high

byte (11C4) and the low byte (11C5) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).

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MicroTech Absorption Chiller Open Protocol Data Information 10

Hot Water Inlet Temperature 11B8,11B9

This is the Hot Water Inlet Temperature for DC-U units. These locations contain valid data only

when the Chiller/Heater is in the heating mode. These locations are read by forming the high byte

(11B8) and the low byte (11B9) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).

Hot Water Inlet Temperature 11BA,11BB

This is the Hot Water Inlet Temperature. These locations are valid only for Simultaneous

Chiller/Heater units (DC-S) and Hot Water units (DC-H). These locations are read by forming the

high byte (11BA) and the low byte (11BB) into a two byte number and dividing by 10 (0.1 * X + 0

= °F).

Hot Water Outlet Temperature 11B4,11B5

This is the Hot Water Outlet Temperature for DC-U units. These locations contain valid data only

when the Chiller/Heater is in the heating mode. These locations are read by forming the high byte

(11B4) and the low byte (11B5) into a two byte number and dividing by 10 (0.1 * X + 0 = °F).

Hot Water Outlet Temperature 11B6,11B7

This is the Hot Water Outlet Temperature. These locations are valid only for Simultaneous

Chiller/Heater units (DC-S) and Hot Water units (DC-H). These locations are read by forming the

high byte (11B6) and the low byte (11B7) into a two byte number and dividing by 10 (0.1 * X + 0 =

°F).

Invertor Output Signal 119E

This is the output signal to the Invertor. This location is read by taking byte 119E and dividing by

3.3 (.30303 * X + 0 = Hz)

Low Temperature Generator Temperature 11BC,11BD

This is the Low Temperature Generator Temperature. These locations are read by forming the high

byte (11BC) and the low byte (11BD) into a two byte number and dividing by 10 (0.1 * X + 0 = °F)

Remote Reset Current Signal 1196,1197

This is the Remote Reset Current Signal from the BAS company. This is used to offset from the

heating or cooling setpoint, depending on the mode of the Chiller/Heater unit. These locations are

read by forming the high byte (1196) and the low byte (1197) into a two byte number and dividing

by 10 (0.1 * X + 0 = mA).

Steam Control Valve Output Signal 11E0,11E1

This is the output signal to the Steam Control Valve. This is only applicable on NC-U units. These

locations are read by forming the high byte (11E0) and the low byte (11E1) into a two byte number

and dividing by 10 (0.1 * X + 0 = %).

Digital Input Data

Description Address Range Units

Absorbent Pump 1 or Invertor

(Alarm)

1281

BIT 1

0=Normal

1=Alarm

X X X X

Absorbent Pump 1 (Off/On)

1282

BIT 7

0=Off

1=On

X X X X X

Absorbent Pump 2 (Alarm)

1281

BIT 2

0=Normal

1=Alarm

X X X X X

Absorbent Pump 2 (Off/On)

1283

BIT 0

0=Off

1=On

X X X X X

McQuay International Proprietary Information - Subject to Change

11 MicroTech Absorption Chiller Open Protocol Data Information

Description Address Range Units

Auto Restart after Power

Failure

1280

BIT 3

0=Disabled

1=Enabled

X X X X

Burner Signal

1280

BIT 0

0=Off

1=On

X X X

Chilled Water Flow Rate

1282

BIT 4

0=NoFlow

1=Flow

X X X X X

Chilled Water Pump Interlock

1281

BIT 7

0=Open 1=Closed

X X X X X

Control Valve 1

(DC-* units)

1280

BIT 7

0=Auto 1=Manual

X X X

Control Valve 1

(Automatic) (NC-U)

1284

BIT 0

0=Not in Auto

1= Auto

X X

Control Valve 1

(Manual Close) (NC-U)

1284

BIT 1

0=Not Mnl Close

1= Mnl Close

Control Valve 1

(Manual Open) (NC-U)

1284

BIT 3

0=Not Mnl Open

1=Mnl Open

Control Valve 1

(Manual Stop) (NC-U)

1284

BIT 2

0=Not Mnl Stop

1= Mnl Stop

Control Valve 2

1281

BIT 0

0=Auto 1=Manual

Cooling Mode

1280

BIT 4

0=No Cooling

1=Cooling

X X X X X

Cooling Water Flow Rate

1282

BIT 6

0=NoFlow

1=Flow

X X X X X

Cooling Water Pump Interlock

1282

BIT 1

0=Open 1=Closed

X X X X X

Flame Failure

1283

BIT 5

0=Normal

1=Alarm

X X X

Heating Mode

1280

BIT 5

0=No Heating

1=Heating

X X X

High Temperature Generator

Low Solution Level

1280

BIT 2

0=Normal

1=Alarm

X X X

High Temperature Generator

Pressure

1282

BIT 3

0=Normal

1=Alarm

X X X X

Hot Water Pump Interlock

1282

BIT 0

0=Open 1=Closed

X X

Purge Pump

1283

BIT 2

0=Off

1=On

X X X X

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MicroTech Absorption Chiller Open Protocol Data Information 12

Description Address Range Units

Refrigerant Pump (Alarm)

1281

BIT 6

0=Normal

1=Alarm

X X X X X

Refrigerant Pump (Off/On)

1283

BIT 4

0=Off

1=On

X X X X X

Remote Start/Stop Signal 1

1284

BIT 6

0=Stop

1=Start

X X X X X

Simultaneous Mode

1280

BIT 6

0=No Simul

1=Simul

Absorbent Pump 1 or Invertor (Alarm) 1281, BIT 1

This is the alarm status of Absorbent Pump 1 or the Invertor. A 0 indicates normal operation and a 1

indicates an alarm condition.

Absorbent Pump 1 (Off/On) 1282, BIT 7

This is the off/on status of Absorption Pump 1. A 0 indicates the pump is off and a 1 indicates the

pump is on.

Absorbent Pump 2 (Alarm) 1281, BIT 2

This is the alarm status of Absorbent Pump 2. A 0 indicates normal operation and a 1 indicates an

alarm condition.

Absorbent Pump 2 (Off/On) 1283, BIT 0

This is the off/on status of Absorption Pump 2. A 0 indicates the pump is off and a 1 indicates the

pump is on.

Auto Restart after Power Failure 1280, BIT 3

This is the status of the Auto Restart after Power Failure. A 0 indicates the Auto Restart after Power

Failure is disabled and a 1 indicates that it is enabled.

Burner Signal 1280, BIT 0

This is the off/on signal of the Burner Signal for DC units. A 0 indicates an off signal and a 1

indicates an on signal.

Chilled Water Flow Rate 1282, BIT 4

This is the status of the Chilled Water Flow Rate switch. A 0 indicates no flow and a 1 indicates

flow.

Chilled Water Pump Interlock 1281, BIT 7

This is the status of the Chilled Water Pump Interlock. A 0 indicates an open interlock and a 1

indicates a closed interlock.

Control Valve 1 1280, BIT 7

This is the auto/manual status of Control Valve 1 for DC units (DC-*). A 0 indicates Auto mode and

a 1 indicates Manual Mode.

Control Valve 1 (Automatic) 1284, BIT 0

This is the Automatic control of Control Valve 1 for Steam units (NC-U). A 0 indicates the control

valve is not in the automatic mode and a 1 indicates the control valve is in the automatic mode.

Control Valve 1 (Manual Close) 1284, BIT 1

This is the Manual Close control of Control Valve 1 for Steam units (NC-U). A 0 indicates the

control valve is not in the manual close mode and a 1 indicates the control valve is in the manual

close mode.

McQuay International Proprietary Information - Subject to Change

13 MicroTech Absorption Chiller Open Protocol Data Information

Control Valve 1 (Manual Open) 1284, BIT 3

This is the Manual Open control of Control Valve 1 for Steam units (NC-U). A 0 indicates the

control valve is not in the manual open mode and a 1 indicates the control valve is in the manual

open mode.

Control Valve 1 (Manual Stop) 1284, BIT 2

This is the Manual Stop control of Control Valve 1 for Steam units (NC-U). A 0 indicates the

control valve is not in the manual stop mode and a 1 indicates the control valve is in the manual stop

mode.

Control Valve 2 1281, BIT 0

This is the auto/manual status of Control Valve 2. This location is applicable only for Simultaneous

units (DC-S). A 0 indicates Auto mode and a 1 indicates Manual mode.

Cooling Mode 1280, BIT 4

This indicates the unit is in the Cooling mode. A 0 indicates that chiller is not in Cooling and a 1

indicates that the unit is in Cooling.

Cooling Water Flow Rate 1282, BIT 6

This is the status of the Cooling Water Flow Rate. A 0 indicates no flow and a 1 indicates flow.

Cooling Water Pump Interlock 1282, BIT 1

This is the status of the Cooling Water Pump Interlock. A 0 indicates an open interlock and a 1

indicates a closed interlock.

Flame Failure 1283, BIT 5

This is the alarm status of the Flame Failure for DC units. A 0 indicates normal operation and a 1

indicates an alarm condition.

Heating Mode 1280, BIT 5

This indicates the unit is in the Heating mode. A 0 indicates that chiller is not in Heating and a 1

indicates that the unit is in Heating.

High Temperature Generator Low Solution Level 1280, BIT 2

This is the alarm status of the Low Solution Level in the High Temperature Generator for DC units.

A 0 indicates normal operation and a 1 indicates an alarm condition.

High Temperature Generator Pressure 1282, BIT 3

This is the alarm status of the High Temperature Generator Pressure. A 0 indicates normal operation

and a 1 indicates an alarm condition.

Hot Water Flow Rate 1282, BIT 5

This is the status of the Hot Water Flow Rate for Simultaneous units (DC-S) and Hot Water units

(DC-H). A 0 indicates no flow and a 1 indicates flow.

Hot Water Pump Interlock 1282, BIT 0

This is the status of the Hot Water Pump Interlock. A 0 indicates an open interlock and a 1 indicates

a closed interlock.

Purge Pump 1283, BIT 2

This is the off/on status of the Purge Pump. A 0 indicates the pump is off and a 1 indicates the

pump is on.

Refrigerant Pump (Alarm) 1281, BIT 6

This is the alarm status of the Refrigerant Pump. A 0 indicates normal operation and a 1 indicates an

alarm condition.

Refrigerant Pump (Off/On) 1283, BIT 4

This is the off/on status of the Refrigerant Pump. A 0 indicates the pump is off and a 1 indicates the

pump is on.

Remote Start/Stop Signal 1 1284, BIT 6

This is the first of the start/stop signals. This is the input that will be used for remote start/stop of the

chiller. A 0 indicates a stop signal and a 1 indicates a start signal.

Proprietary Information - Subject to Change McQuay International

MicroTech Absorption Chiller Open Protocol Data Information 14

Simultaneous Mode 1280, BIT 6

This indicates the unit is in the Simultaneous mode. A 0 indicates that chiller is not in Simultaneous

and a 1 indicates that the unit is in Simultaneous mode.

Digital Output Data

Description Address Range Units

Absorbent Pump 1

1286

BIT 1

0=Disabled

1=Enabled

X X X X X

Absorbent Pump 2

1286

BIT 2

0=Off 1=On

X X X X

Alarm Indication

1285

BIT 2

0=No Alm

1=Alarm

X X X X X

Answer Back Signal

1287

BIT 4

0=Off 1=On

X X X X X

Burner Controller Signal

1286

BIT 5

0=Disabled

1=Enabled

X X X

Burner Signal

1286

BIT 6

0=Off 1=On

X X X

Chilled and/or Hot Water Pump

Signal

1287

BIT 6

0=Off 1=On

X X X X X

Cooling Main/Heating Main

1285

BIT 4

0=Htg 1=Clg

Cooling Mode Indication

1287

BIT 7

0=Off 1=On

X X X X X

Cooling Water Pump Signal

1287

BIT 5

0=Off 1=On

X X X X X

Fuel Input Valve/Cooling Main

Mode (Close)

1287

BIT 1

0=Off 1=On

X X X X

Fuel Input Valve/Cooling Main

Mode (Open)

1287

BIT 0

0=Off 1=On

X X X X

Fuel Input Valve/Heating Main Mode

(Close)

1287

BIT 3

0=Off 1=On

Fuel Input Valve/Heating Main Mode

(Open)

1287

BIT 2

0=Off 1=On

Heating Mode Indication

1285

BIT 0

0=Off 1=On

X X X

Operation Indication

1286

BIT 0

0=Off 1=On

X X X X X

Refrigerant Pump Automatic

Function

1286

BIT 3

0=Disabled

1=Enabled

X X X X X

Refrigerant Pump Manual Function

1286

BIT 4

0=Disabled

1=Enabled

X X X X X

Simultaneous Mode Indication

1285

BIT 1

0=Off 1=On

SVRP valve (open/close)

1285

BIT 3

0=Off 1=On

SVRU valve (open/close)

1286

BIT 7

0=Off 1=On

McQuay International Proprietary Information - Subject to Change

15 MicroTech Absorption Chiller Open Protocol Data Information

Absorbent Pump 1 1286, BIT 1

This is the enable/disable signal to Absorbent Pump 1. A 0 indicates an the pump is disabled and a

1 indicates the pump is enabled.

Absorbent Pump 2 1286, BIT 2

This is the status of the on/off signal to Absorbent Pump 2. A 0 indicates an the pump is off and a 1

indicates the pump is on.

Alarm Indication 1285, BIT 2

This is the status of the Alarm Indication. A 0 indicates normal (no alarm) operation and a 1

indicates an alarm condition.

Answer Back Signal 1287, BIT 4

This is the status of the Answer Back Signal. This is used to confirm a start signal that has been

accepted. A 0 indicates an off condition and a 1 indicates a start or running condition.

Burner Controller Signal 1286, BIT 5

This is the status of the Burner Controller Signal. This is used to prevent burner operation in an

alarm condition. A 0 indicates either an off or alarm condition (disabled) and a 1 indicates that the

burner is able to operate normally (enabled).

Burner Signal 1286, BIT 6

This is the output to the Burner Controller. This location is applicable only for DC units. A 0

indicates an off signal and a 1 indicates an on signal.

Chilled and/or Hot Water Pump Signal 1287, BIT 6

This is the status of the Chilled and/or the Hot Water Pump Signal. A 0 indicates a pump off signal

and a 1 indicates a pump on signal.

Cooling Main/Heating Main 1285, BIT 4

This is the status of the Cooling Main/Heating Main indication output. This location is applicable

only for Simultaneous units (DC-S). A 0 indicates the unit is in heating main and a 1 indicates that

the unit is in cooling main.

Cooling Mode Indication 1287, BIT 7

This is the status of the Cooling Mode Output. A 0 indicates the unit is not in the Cooling mode and

a 1 indicates the unit is in the Cooling mode. This output is used as an indicator to remote systems.

Cooling Water Pump Signal 1287, BIT 5

This is the status of the Cooling Water Pump Signal. A 0 indicates a pump off signal and a 1

indicates a pump on signal.

Fuel Input Valve/Cooling Main Mode (Close) 1287, BIT 1

This is the status of the Fuel Input Valve/Cooling Main Mode close output. A 0 indicates the valve

is not closing (off) and a 1 indicates the valve is closing (on).

Fuel Input Valve/Cooling Main Mode (Open) 1287, BIT 0

This is the status of the Fuel Input Valve/Cooling Main Mode open output. A 0 indicates the valve is

not opening and a 1 indicates the valve is opening.

Fuel Input Valve/Heating Main Mode (Close) 1287, BIT 3

This is the status of the Fuel Input Valve/Heating Main Mode close output. This location is

applicable only for Simultaneous units (DC-S). A 0 indicates the valve is not closing (off) and a 1

indicates the valve is closing (on).

Fuel Input Valve/Heating Main Mode (Open) 1287, BIT 2

This is the status of the Fuel Input Valve/Heating Main Mode open output. This location is

applicable only for Simultaneous units (DC-S). A 0 indicates the valve is not opening (off) and a 1

indicates the valve is opening (on).

Heating Mode Indication 1285, BIT 0

This is the status of the Heating Mode Output. This location is applicable only for DC units. A 0

indicates the unit is not in the Heating mode and a 1 indicates the unit is in the Heating mode. This

output is used as an indicator to remote systems.

Proprietary Information - Subject to Change McQuay International

MicroTech Absorption Chiller Open Protocol Data Information 16

Operation Indication Contact 1286, BIT 0

This is the status of the chiller. A 0 indicates the unit is off and a 1 indicates the unit is on even

during the dilution cycle.

Refrigerant Pump Automatic Function 1286, BIT 3

This is the automatic start/stop of the Refrigerant Pump. A 0 indicates the automatic function is

disabled and a 1 indicates the automatic function is enabled.

Refrigerant Pump Manual Function 1286, BIT 4

This is the manual start/stop mode of the Refrigerant Pump. A 0 indicates the manual function is

disabled and a 1 indicates the manual function is enabled. The microprocessor can still stop the

pump while in the Manual Start mode.

Simultaneous Mode Indication 1285, BIT 1

This is the status of the Simultaneous Mode Output. This location is applicable only for

Simultaneous units (DC-S). A 0 indicates the unit is not in the Simultaneous mode and a 1 indicates

the unit is in the Simultaneous mode. This output is used as an indicator to remote systems.

SVRP Valve 1285, BIT 3

This valve is used for simultaneous chiller/heaters to drain refrigerant from the condenser sump.

SVRU Valve 1286, BIT 7

This valve is used for simultaneous chiller/heaters to drain refrigerant from the evaporator sump.

SW3 Status

Description Address Range Units

Unit Model Type

1381

BITS 0-3

See long

description for

Model Types

Model Type

X X X X X

The following is a diagram of the layout of the SW3 switches:

10 þÿ Clock Speed

9 þÿ Data Sampling Time

8 þÿ Undefined

7 þÿ Remote Signal Polarity

6 þÿ Remote Start/Stop

5 þÿ Controller System

4 þÿ Unit Type (BIT 3)

3 þÿ Unit Type (BIT 2)

2 þÿ Unit Type (BIT 1)

1 þÿ Unit Type (BIT 0)

Off On

Unit Model Type 1381, BITS 0-3

These bits are used to determine the Model Type to the chiller. The following show the relationship

between bit settings and model types:

BIT 0 BIT 1 BIT 2 BIT 3 Model

0 0 0 0 DC-S or DC-H (Gas Fired)

1 0 0 0 DC-S or DC-H (Oil Fired)

0 1 0 0 DC-U (Gas Fired)

1 1 0 0 DC-U (Oil Fired)

0 0 1 0 DC-U without heating mode (Gas)

1 0 1 0 DC-U without heating mode (Oil)

0 1 1 0 TC-U

1 1 1 0 NC-U

McQuay International Proprietary Information - Subject to Change

17 MicroTech Absorption Chiller Open Protocol Data Information

BIT 0 BIT 1 BIT 2 BIT 3 Model

0 0 0 1 TC-U for heavy duty

1 0 0 1 NC-U for heavy duty

0 1 0 1 LC-U

1 1 0 1 LC-U for heavy duty

Start/Stop Data

Description Address Range Units

Absorbent Pump 1

1488-148B Highest Byte-

Lowest Byte

BCD

X X X X X

Burner

1484-1487 Highest Byte-

Lowest Byte

BCD

X X X

Refrigerant Pump

148C-148F Highest Byte-

Lowest Byte

BCD

X X X X X

Unit

1480-1483 Highest Byte-

Lowest Byte

BCD

X X X X X

Absorbent Pump 1 1488-148B

This is the amount of Absorbent Pump 1 starts and stops. This number is recorded in BCD format.

Byte 1488 is the highest byte of the BCD string and byte 148B is the lowest byte of the BCD string.

This is a literal string, no conversion is needed to read the Start/Stop Data. The following will

illustrate this:

Byte 1488 1489 148A 148B

00 00 15 76

This translates to 1576 Starts/Stops.

BCD = Binary Coded Decimal

Burner 1484-1487

This is the amount of starts and stops of the Burner. These locations are applicable only for DC

units. This number is recorded in BCD format. Byte 1484 is the highest byte of the BCD string and

byte 1487 is the lowest byte of the BCD string. The starts/stops are read the same way as the

starts/stops for Absorbent Pump 1.

Refrigerant Pump 148C-148F

This is the amount of Refrigerant Pump starts and stops. This number is recorded in BCD format.

Byte 148C is the highest byte of the BCD string and byte 148F is the lowest byte of the BCD string.

The starts/stops are read the same way as the starts/stops for Absorbent Pump 1.

Unit 1480-1483

This is the amount of Chiller/Heater unit starts and stops. This number is recorded in BCD format.

Byte 1480 is the highest byte of the BCD string and byte 1483 is the lowest byte of the BCD string.

The starts/stops are read the same way as the starts/stops for Absorbent Pump 1.

Operating Time (Hours)

Description Address Range Units

Absorbent Pump 1 Operation

1588-

158B

Highest Byte-

Lowest Byte

BCD

X X X X X

Proprietary Information - Subject to Change McQuay International

MicroTech Absorption Chiller Open Protocol Data Information 18

Description Address Range Units

Burner Operation

1584-1587 Highest Byte-

Lowest Byte

BCD

X X X

Refrigerant Pump Operation

158C-158F Highest Byte-

Lowest Byte

BCD

X X X X X

Unit Operation

1580-1583 Highest Byte-

Lowest Byte

BCD

X X X X X

Absorbent Pump 1 Operation 1588-158B

This is the amount of Absorbent Pump 1 operating hours. This number is recorded in BCD format.

Byte 1588 is the highest byte of the BCD string and byte 158B is the lowest byte of the BCD string.

This is a literal string, no conversion is needed to read the Operating Time (Hours). The following

will illustrate this:

Byte 1488 1489 148A 148B

00 05 32 48

This translates to 53,248 hours.

BCD = Binary Coded Decimal

Burner Operation 1584-1587

This is the amount of Burner operating hours. These locations are applicable only for DC units.

This number is recorded in BCD format. Byte 1480 is the highest byte of the BCD string and byte

1483 is the lowest byte of the BCD string. The operating hours are read the same way as the

operating hours for Absorbent Pump 1.

Refrigerant Pump Operation 158C-158F

This is the amount of Refrigerant Pump operating hours. This number is recorded in BCD format.

Byte 1480 is the highest byte of the BCD string and byte 1483 is the lowest byte of the BCD string.

The operating hours are read the same way as the operating hours for Absorbent Pump 1.

Unit Operation 1580-1580

This is the amount of Chiller/Heater unit operating hours. This number is recorded in BCD format.

Byte 1480 is the highest byte of the BCD string and byte 1483 is the lowest byte of the BCD string.

The operating hours are read the same way as the operating hours for Absorbent Pump 1.

Operating Time (Minutes/Seconds)

Description Address Range Units

Absorbent Pump 1 Operation

1684-1685 Hi Byte Lo

Byte

In Seconds

X X X X X

Burner Operation

1682-1683 Hi Byte Lo

Byte

In Seconds

X X X

Refrigerant Pump Operation

1686-1687 Hi Byte Lo

Byte

In Seconds

X X X X X

Unit Operation

1680-1681 Hi Byte Lo

Byte

In Seconds

X X X X X

McQuay International Proprietary Information - Subject to Change

19 MicroTech Absorption Chiller Open Protocol Data Information

Absorbent Pump 1 Operation 1684-1685

This is the operating minutes and seconds of Absorbent Pump 1. This works with the Operating

Hours of Absorbent Pump 1 to present the total operating time of Absorbent Pump 1. Memory

location 1684 represents the high byte and memory location 1685 represents the low byte. These

memory locations store the Operating Time (Minutes and Seconds) in seconds. Therefore, to

determine the Operating Time (Minutes and Seconds), divide the number stored in bytes 1684 and

1685 by 60. This will give the Operating Minutes and the remainder will be the Operating Seconds.

Byte 1684 1685

$03 $7A

$037A = 890

890 / 60 = 14 (minutes), remainder of 50 (seconds)

Burner Operation 1682-1683

This is the operating minutes and seconds of the Burner. These locations are applicable only for DC

units. This works with the Operating Hours of the Burner to present the total operating time of the

Burner. Memory location 1684 represents the high byte and memory location 1685 represents the

low byte. These memory locations store the Operating Time (Minutes and Seconds) in seconds.

Therefore, to determine the Operating Time (Minutes and Seconds), divide the number stored in

bytes 1684 and 1685 by 60. This will give the Operating Minutes and the remainder will be the

Operating Seconds. See the above example for Absorbent Pump 1 for more details of determining

Operating Time (Minutes and Seconds).

Refrigerant Pump 1686-1687

This is the operating minutes and seconds of the Refrigerant Pump. This works with the Operating

Hours of the Refrigerant Pump to present the total operating time of the Refrigerant Pump. Memory

location 1684 represents the high byte and memory location 1685 represents the low byte. These

memory locations store the Operating Time (Minutes and Seconds) in seconds. Therefore, to

determine the Operating Time (Minutes and Seconds), divide the number stored in bytes 1684 and

1685 by 60. This will give the Operating Minutes and the remainder will be the Operating Seconds.

See the above example for Absorbent Pump 1 for more details of determining Operating Time

(Minutes and Seconds).

Unit Operation 1680-1681

This is the operating minutes and seconds of the Chiller/Heater unit. This works with the Operating

Hours of the Chiller/Heater unit to present the total operating time of the Chiller/Heater unit.

Memory location 1684 represents the high byte and memory location 1685 represents the low byte.

These memory locations store the Operating Time (Minutes and Seconds) in seconds. Therefore, to

determine the Operating Time (Minutes and Seconds), divide the number stored in bytes 1684 and

1685 by 60. This will give the Operating Minutes and the remainder will be the Operating Seconds.

See the above example for Absorbent Pump 1 for more details of determining Operating Time

(Minutes and Seconds).

ID Code/PID Sampling/Data Pointer(s)

Description Address Range Units

DCH DCS DCU NCU LCU

Alarm Pointer

168C See Below

X X X X X

PID Sampling

168D 5-30 Seconds

X X X X X

Unit Serial Number

1689-168B BCD

X X X X X

Alarm Pointer 168C

This location contains the data pointers for the Abnormal (Alarm) Data. The McQuay Controller

contains three alarm buffers. Each of these buffers holds the operating conditions of the chiller when

an alarm condition occurred. These three buffers store the operating conditions in a circular buffer

pattern.

Proprietary Information - Subject to Change McQuay International

MicroTech Absorption Chiller Open Protocol Data Information 20

Pointers are used to indicate where the next data is to be written to and to indicate that the buffers are

full and the newest data is overwriting the oldest data.

The data pointers for the two items are located in byte 168C. The format for these pointers is as

follows:

BIT 7 6 5 4 3 2 1 0

BYTE 168C

Data Full

Flag

Position for

Abnormal

Data

Position for

Abnormal

Data

Position for

Abnormal

Data

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McQuay MicroTech MAG Protocol Manual

Brand: McQuay

Model: MicroTech MAG

Category: Water heaters & boilers

Type: Protocol Manual

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McQuay MicroTech MAG Protocol Manual

McQuay MicroTech MAG Protocol Manual

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