Daikin UAA-ST3M Operating instructions

OPERATION

MANUAL

AIR -COOLED CHILLER

(SINGLE SCREW COMPRESSOR)

UAA-ST3M

OM-UAA-0620(1)-DAIKIN

Part Number: C08019049338

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TABLE OF CONTENTS

TABLE OF CONTENTS II

1. INTRODUCTION 3

1.1 General 3

2. DEFINITION 5

3. ABOUT SAFETY 7

4. CONTROL PANEL 8

4.1 System Architecture 8

4.2 Control Panel Layout 9

4.3 Controller features 10

4.4 Main controller 11

5. OPERATING THE CONTROL SYSTEM 13

5.1 Start/Stop Unit 13

5.2 Parameter Viewing and setting 14

6. UNIT PARAMETERS 32

6.1 Unit Setpoints 32

7. TROUBLESHOOTING GUIDE 40

7.1

Startup Troubleshooting Guide

40

7.2 Alarm Troubleshooting Guide 42

7.3 Alarm Clearing 73

7.4 Alarm Log 73

8. BAS INTERFACE 74

8.1 General 74

8.2 Modbus protocol 74

8.3 BACNEt protocol 78

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1. INTRODUCTION

1.1 General

This manual provides setup, operating, troubleshooting and maintenance information for the DAIKIN

Air Cooled Single Screw Chillers listed below with 1 and 2 circuits using MicroTech III Controller.

HAZARD IDENTIFICATION INFORMATION

⚠ DANGER

Dangers indicate a hazardous situation which will result in death or serious injury if not avoided.

⚠ WARNING

Warnings indicate potentially hazardous situations, which can result in property damage, severe

personal injury, or death if not avoided.

⚠ CAUTION

Cautions indicate potentially hazardous situations, which can result in personal injury or equipment

damage if not avoided.

ER

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Software Version:

This manual covers units with Software Version: MHS010V1.31

The unit’s software version number can be viewed by selecting the “About chiller” menu item

accessible without password.

⚠ CAUTION

• Electric shock hazard: can cause personal injury or equipment damage. This equipment must

be properly grounded. Connections to, and service of, the MicroTech III control panel must

be performed only by personnel who are knowledgeable in the operation of this equipment.

• 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 control panel before performing any service work. Never unplug any cables,

circuit board terminal blocks, or power plugs while power is applied to the panel.

! WARNIN

! CAUTION

NOTICE

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

in accordance with this instruction manual, can cause interference to radio communications.

Operation of this equipment in a residential area can cause harmful interference, in which case the

user will be required to correct the interference at the user’s own expense. Daikin disclaims any

liability resulting from any interference or for the correction thereof.

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2. DEFINITION

Active Setpoint

The active setpoint is the parameter setting in effect at any given moment. This variation can occur on

setpoints that can be altered during normal operation. Resetting the chilled water leaving temperature

setpoint by one of several methods such as return water temperature is an example.

Active Capacity Limit

The active capacity setpoint is the setting in effect at any given moment. Any one of several external

inputs can limit a compressor’s capacity below its maximum value.

Dead Band

The dead band is a set of values associated with a setpoint such that a change in the variable occurring

within the dead band causes no action from the controller. For example, if a temperature setpoint is

44F and it has a dead band of 0.2 degrees F, nothing will happen until the measured temperature is less

than 43.8F or more than 44.2F.

LWT

Chilled / Evaporator leaving water temperature.

EWT

Chilled / Evaporator entering water temperature.

Discharge Superheat

Discharge superheat is calculated using the following equation:

Discharge Superheat = Discharge Temperature – Condenser Saturated Temperature

Suction Superheat (SSH)

SSH is calculated for each circuit using the following equation:

SSH = Suction Temperature – Evaporator Saturated Temperature

Evaporator Approach

The evaporator approach is calculated for each circuit. The equation is as follows:

Evaporator Approach = LWT – Evaporator Saturated Temperature.

EXV

Electronic expansion valve, used to control the flow of refrigerant to the evaporator, controlled by the

circuit microprocessor.

Unload Evaporator Low Pressure Setpoint

The kPa suction pressure setting at which the controller will unload the compressor to maintain the

minimum setting.

HMI

Operator Interface Touch Screen, one screen per unit provides operating data visually and

accommodates setpoint entry.

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Stage Up / Stage Down Delta-T

Staging is the act of starting or stopping a compressor or fan when another is still operating. Startup

and Stop is the act of starting the first compressor or fan and stopping the last compressor or fan. The

Delta-T is the “dead band” on either side the setpoint in which no action is taken.

Stage Up Delay

The time delay from the start of the first compressor to the start of the second.

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3. ABOUT SAFETY

Electrical installation

⚠ CAUTION

• All electrical connections to the machine must be carried out in compliance

with laws and regulations in force.

• All installation, operating and maintenance activities must be carried out by

qualified personnel.

• Please refer to the specific wiring diagram for the machine that you have

purchased, and which was sent with the unit.

• Should the wiring diagram not come with the machine, please contact your

dealer for further action.

• Use copper conductors only. Failure to use copper conductors could cause

overheating or corrosion at the connection points and damages the unit.

• To avoid interference, all control wires must be installed separately from the

power wires. Use separate electrical conduits for this purpose.

• Before servicing the machine in any way, open the general disconnecting

switch on the machine's main power supply.

• When the machine is off, but the disconnector switch is in the closed position,

unused circuits are live as well.

• Never open the terminal board box of the compressors before having opened

the unit's general disconnecting switch.

• In installations with power supply lines longer than 50 meters, inductive

coupling between phases and between phase and earth generates significant

electromagnetic field.

• In order to limit these phenomena, it is good practice to lay out the phase

wires symmetrically, as described in the figure:

• Chiller unit compressors are single-direction rotation compressors and can be

damaged if rotated in the wrong direction. For this reason, proper phasing of

electrical power is important. Terminal block indicator (R, S, T). R=L1, S=L2, T=L3

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4. CONTROL PANEL

4.1 System Architecture

The MicroTech III control system for air cooled single screw chillers consists of a main unit controller

with several extension I/O modules attached depending on the chiller size and configuration. Up to

two optional BAS communication modules may be included on request.

The overall controls architecture uses the following:

• One Microtech III main controller

• I/O extension modules as needed depending on the configuration of the unit

• Optional BAS interface as selected

Model

Controller Quantity

POL687.7

POL945

POL965

POL94U

UAA105– UAA220

1

UAA245-UAA450

1

2

BAS

Interface

(Modbus,

Bacnet)

MicroTech III Main

Controller POL687

I/O Extension

POL965

(Sys 1)

I/O

Extension

POL94U

(Sys 1)

I/O

Extension

POL94U

(Sys 2)

I/O Extension

POL945

I/O Extension

POL965

(Sys 2)

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4.2 Control Panel Layout

Item

Function

Description

1

Q0 (Unit Switch)

OFF

Turn OFF the unit

ON

Turn ON the unit

2

Q1 (1#SYS SW)

OFF

Turn OFF System 1

ON

Turn ON System 1

3

Q2 (2#SYS SW)

OFF

Turn OFF System 2

ON

Turn ON System 2

4

CM1

Indicating working current for 1#SYS Compressor

5

CM2

Indicating working current for 2#SYS Compressor

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4.3 Controller features

1. Display following temperature and pressure readings:

i. Entering and leaving chilled water temperature

ii. Saturated evaporator refrigerant temperature and pressure

iii. Saturated condenser refrigerant temperature and pressure

iv. Suction line, and discharge line temperatures – calculated superheat for

suction and discharge lines

2. Unit and system status display.

3. Selectable leaving or entering water temperature control based on application.

4. EXV auto control using suction superheat.

5. Condenser fans control based on condenser pressure.

6. Three levels of security password protection against unauthorized changing of setpoint

and other control parameters.

7. Pre-emptive control for low evaporator pressure and high condenser pressure condition

to take corrective action prior to fault trip.

8. Alarm display to inform operators of warning and fault conditions. All events and

alarms are with time and date for identification of when the fault condition occurred.

9. Alarm history display with time and date for identification.

10. Test mode allows the service technician to manually control the controller’s output and

can be useful for system checkout

11. Building Automation System (BAS) communication capability via Modbus and

BACnet standard protocols.

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4.4 Main controller

4.4.1 Installation of controller battery

Every delivered unit is come with a lithium coin cell 3V battery, packed in a sealable plastic

bag as illustrated in figure below:

The battery acts as backup power for controller internal memory retention (setting and

parameters) when there is power failure.

After the unit get to the site, must install the controller battery by the customer service

technicians before commissioning. Adjust the controller time to local time is required.

Please refer to procedure below for battery installation in the controller:

1. Power off the controller

2. Using a small screwdriver, remove the front cover on the controller

MT3006 (POL687.70)

3. Insert the battery into the compartment on the side with the battery

facing upward as shown in figure below:

4. Close the left side of the cover and then pressing on the right side

with a finger.

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4.4.2 Controller layout

Item

Function

Description

1

LED backlight screen

Display information or data

2

Alarm Query

Press the key to enter alarm menu

3

Shortcut key

Return to main menu

4

Return

Return to the upper-layer menu

5

Turn

Clockwise

Up

Page up while checking / Reduce value while

parameter setting

Turn Anti-

Clockwise

Down

Page down while checking / increase value

while parameter setting

Press

Enter

Confirm Operation

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5. OPERATING THE CONTROL SYSTEM

5.1 Start/Stop Unit

Unit start-up

Start-up procedure

Steps

Description

1

Pre-start check up

1.1

Confirm the unit has been commissioned and ready for operation

1.2

Check whether unit status meet the requirements of start-up.

2

Start-up

2.1

Supply power to the unit

2.2

Turn the Emergency Stop clockwise until it springs up.

2.3

Turn MCB (Moulded Circuit Breaker) Q12 at low voltage panel to ON. The following

main menu displays in 30 seconds.

2.4

Turn Q0 (Unit Switch) to ON, the screens display the following

After the unit and water circulation started, confirm whether the water system works

properly. If the controller does not display “Auto: Evap Recirc”, see 10.1

2.5

Turn the Q1 (1#SYS SW.) and Q2 (2#SYS SW.) to ON, then unit will start and adjust

load automatically. If it need circuit 1 or circuit 2 run alone, just turn the respective switch

to ON.

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Unit shut down

Shut down procedure

Steps

Description

1

Shut down - Circuit

1.1

To shutdown circuit 1# or circuit 2#, turn the switch of the corresponding circuit to “OFF”.

After these operations, the circuit will shut down automatically.

2

Shut down - Unit

2.1

Turn Q1(1#SYS SW.) and Q2(2#SYS SW.) to OFF

2.2

Turn Q0 (UNIT SWITCH) to OFF. After these operations, the unit will shut down

automatically.

5.2 Parameter Viewing and setting

After entering the user password, you can view and modify parameters at the user level. The

default user password is 1990. Parameter setting must be in accord with this operation manual.

Improper setting can cause erratic chiller operation and damage to the chiller.

Below table shows different page accessibility:

Main Menu

Steps

Description

1

Press the shortcut key to go to the main menu

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Main Menu

Steps

Description

2

Press the knob. The password input interface displays.

3

Press the knob and enter the highest digit of the password and press the knob to confirm the

entry. Enter other digits in turn in the same way. If the user password is correct, you can

view and modify parameters at the user level. After you enter the password, the main menu

displays as below and “6” displays at the upper-left corner.

Turn the knob clockwise. The following menu display in turn

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Setting Temperature

Temperature setting procedure

Steps

Description

1

Enter the user password and choose “View/Set Unit” in main menu then choose

“Temperatures”. The following screen displays:

2

Turn the knob clockwise. The following menus display in turn:

“Cool LWT 1” indicates the setpoint of evaporator leaving water temperature in cooling

mode. The value range is (4.0°C, 15.0°C).

“Cool LWT 2” indicates the double setpoint temperature of leaving water in cooling

mode. The value range is (4.0°C, 15.0°C).

3

To set "Cool LWT 1" or "Cool LWT 2", select the item and press the knob. The

following interface displays

Turn the knob clockwise to increase the value and turn it anticlockwise to decrease the

value and press the knob to confirm the setting. Then the previous menu displays and the

parameter setting takes effect. Other parameters can be set in the same way.

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Quick Menu

Steps

Description

1

Choose Quick Menu

2

Press the knob to enter the Quick Menu

Turn the knob clockwise or anticlockwise to view other parameters in the quick menu.

No.

Menu

Property

Unit

Description

1

Unit Status

R

-

View the current operation status of

the unit.

Auto:

Off: Ice Mode Tmr

Off: OAT Lockout

Off: All Cir Disabled

Off: Unit Alarm

Off: Keypad Disable

Off: Remote Sw

Off: BAS Disable

Off: Unit Sw

Off: Time Schedule

Off: Test Mode

Auto: Noise Reduction

Auto: Wait For Load

Auto: Evap Recirc

Auto: Wait For Flow

Auto: Pumpdn

Auto: Max Pulldn

Auto: Unit Cap Lim

Auto: Current Lim

Off: Cfg Chg,Rst Ctlr

Off : Mfg Loc Not Set

Off: Comm Cfg Tmr

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R: Read

R/W: Read and write by customer

No.

Menu

Property

Unit

Description

2

Active Setpt

R

°C

View the actual setpoint of evaporator

leaving water temperature

3

Evap LWT

R

°C

View the evaporator leaving water

temperature

4

Evap EWT

R

°C

View the evaporator entering water

temperature

5

Unit Capacity

R

°C

View the capacity of the unit

6

Unit Current

R

A

View the current of the unit

7

Softload Limit

R

%

View the softload capacity limitation of

the unit

8

Network Limit

R

%

View the network capacity limitation of

the unit

9

Demand Limit

R

%

View the demand capacity limitation of

the unit

10

Unit Mode

R

-

View the current mode of the unit

11

Control Source

R/W

-

unit. The options are as follows:

Local: The unit is controlled by control

panel

Network: The unit is controlled by local

panel and network

12

Current Limit

R/W

A

View or set the current limitation of the

unit

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View/Set Unit

Steps

Description

1

Choose View/Set Unit

2

Press the knob to enter the View/Set Unit

Turn the knob clockwise or anticlockwise to view other parameters in the quick menu.

User needs to press the enter knob to view details parameters

No.

Menu

Description

1.

Status/Settings

►

Enter the menu. For details, see 41

2.

Set-Up

►

Enter the menu. For details, see 42

3.

Temperatures

►

Enter the menu. For details, see 43

4.

Date/Time/

Schedules

►

Enter the menu. For details, see 44, 45

5.

Power Conservation

►

Enter the menu. For details, see 45

6.

Ctrlr IP Setup

►

Enter the menu. For details, see 46

7.

Design Conditions

►

Enter the menu. For details, see 46

8.

Menu Password

►

Enter the menu. For details, see 46

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Daikin UAA-ST3M Operating instructions

Daikin UAA-ST3M Operating instructions

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