Daikin UAA-ST3M User manual

OPERATION
MANUAL
AIR -COOLED CHILLER
(SINGLE SCREW COMPRESSOR)
UAA-ST3M
OM-UAA-0620(1)-DAIKIN
Part Number:C08019049338

ii | P a g e
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

Page | 3
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

4 | P a g e
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.

Page | 5
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.

6 | P a g e
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

8 | P a g e
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
1
1
1
UAA245-UAA450
1
1
2
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)

Page | 9
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

10 | P a g e
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.

Page | 11
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.

12 | P a g e
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

Page | 13
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.

14 | P a g e
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
Main Menu
Steps
Description
1
Press the shortcut key to go to the main menu

Page | 15
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

16 | P a g e
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.

Page | 17
Quick Menu
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

18 | P a g e
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

Page | 19
View/Set Unit
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