Daikin UAA-ST3M User manual

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

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.

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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.

Page | 7

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

UAA245-UAA450

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)

Page | 9

4.2 Control Panel Layout

Item

Function

Description

Q0 (Unit Switch)

OFF

Turn OFF the unit

Turn ON the unit

Q1 (1#SYS SW)

OFF

Turn OFF System 1

Turn ON System 1

Q2 (2#SYS SW)

OFF

Turn OFF System 2

Turn ON System 2

CM1

Indicating working current for 1#SYS Compressor

CM2

Indicating working current for 2#SYS Compressor

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