Daikin WGZ030DW Operating instructions

Operating and Maintenance Manual OMM 1130-2
Group:Chiller
Part Number:OMM1130-2
Date:March 2014
Water-Cooled Scroll Compressor Chillers
WGZ030DW to WGZ200DW, Packaged Water-Cooled Chiller
WGZ030DA to WGZ200DA, Chiller with Remote Condenser
30 to 200 Tons, 105 to 700 kW
R-410a
50-60 Hertz

2OMM 1130-2
Table of Contents
Introduction .......................................3
General Description.............................. 3
Nomenclature........................................ 3
Water Pressure Drop ............................. 3
Components .......................................... 6
Unit Configuration ............................7
Field Wiring Diagrams.......................... 8
Control Panel Layout.......................... 10
Motor Protection Module.................... 10
Start-Up and Shutdown..................11
Sequence of Operation ....................13
Start-up/Compressor Staging.............. 13
MicroTech II Controller..................17
Controller Software Version................ 17
General Description............................ 17
Expansion I/O Controller.................... 20
Setpoints.............................................. 21
Automatic Adjusted Limits................. 23
Dynamic Defaults ............................... 24
Events & Alarms..............................24
Unit Stop Alarms................................. 24
Limit Events........................................ 28
Controller Operation.......................31
EXV Control....................................... 49
Using the Controller........................ 51
Menu Screens...................................... 52
Menu Descriptions.............................. 53
BAS Interface .................................. 72
Parameter Details................................ 73
Compressor Motor protection
Module.............................................. 76
Optional Controls............................ 78
Phase/Voltage Monitor (Optional) ...... 78
Hot Gas Bypass (Optional)................. 78
System Maintenance....................... 79
General................................................ 79
Electrical Terminals ............................ 79
POE Lubrication ................................. 80
Sightglass and Moisture Indicator....... 80
Crankcase Heaters............................... 80
Maintenance Schedule ........................ 81
System Service................................. 82
Troubleshooting Chart ........................ 84
Warranty Statement ....................... 85
Products manufactured in an ISO Certified facility
© 2014Daikin Applied. Illustrations and data cover the Daikin Applied product atthe time ofpublication and wereserve
the right to make changes indesign andconstruction at anytime without notice.
™® The following are trademarks orregistered trademarks oftheir respective companies: BACnet from ASHRAE; LONMARK,
LonTalk, LONWORKS,and the LONMARK logo are managed, granted and used byLONMARK International under a license
granted by Echelon Corporation; Compliant Scroll from Copeland Corporation; Modbus from Schneider Electric;, MicroTech
II, Open Choices from Daikin Applied.
Cover Picture: WGZ130DW without piping insulation installed for clarity

OMM 1130-23
Introduction
General Description
Daikin Type WGZ water chillers are designed for indoor installations Equipment room temperature for
operating and standby conditions is 40°F to 122°F (4.4°C to 50°C).They are available with water-cooled
condensers (Model DW), or arranged for use with remote air-cooled or evaporative condensers (Model
DA). Each water-cooled unit is completely assembled and factory wired before evacuation, charging and
testing. They consist of hermetic scroll compressors, brazed-plate evaporator, water-cooled condenser (WGZ-
DW), and complete refrigerant piping.
Units manufactured for use with remote condensers (Models WGZ-DA) have all refrigerant specialties factory-
mounted and connection points for refrigerant discharge and liquid lines.
Liquid line components that are included are manual liquid line shutoff valves, charging valves, filter-driers,
liquid line solenoid valves, sight glass/moisture indicators, and thermal expansion valves. Other features
include compressor crankcase heaters, and a MicroTech IImicroprocessor controller.
The electrical control center includes all equipment protection and operating controls necessary for dependable
automatic operation.
NOTE: This manual contains information on the chiller unit control software operating with various
refrigerants as follows:
•R-410A, used with the current “D” vintage of the WGZ chiller.
•R-134a, used with only with Model TGZ Templifiers. The operating manual devoted exclusively to
Templifiers is OMM 1136.
BOOT & BIOS
BOOT Version: 3.0F BIOS Version 3.56
Manuals: Information in unit initial installation and routine maintenance is contained in Installation and
Maintenance Manual IM 1131. Nomenclature
W G Z 100 - D W
Water Pressure Drop
Water flow rates should be maintained as closely as possible to job design values. The vessel flow rates must
fall between the minimum and maximum values shown on the appropriate evaporator and condenser curves.
Measure the water pressure drop through the vessels at field-installed pressure taps and check the flow rate
using the following tables. Do not include valves or strainers in these readings.
The evaporator flow rates and pressure drops shown on the following page are for full load design purposes.
The maximum flow rate and pressure drop are based on a 6-degree temperature drop. Avoid higher flow rates
with resulting lower temperature drops to prevent potential control problems resulting from very small control
bands and limited start up/shut off temperature changes.
The minimum flow and pressure drop is based on a full load evaporator temperature drop of 16-degrees.
Water-Cooled
Global Design
Scroll Compressor
Nominal Capacity (Tons)
W = Water-Cooled Cond.
A = Unit Less Cond.
Design Vintage

4WGZ030D through WGZ200D OMM 1130-2
Figure 1, Evaporator Pressure Drop, WGZ030D – WGZ200D
GPM Ft L/S kPa GPM Ft L/S kPa GPM Ft L/S kPa
WGZ030D A56.3 2.6 3.5 7.7 90.0 6.3 5.6 18.8 150.0 16.6 9.4 49.7
WGZ035D B64.9 3.6 4.1 10.8 103.8 8.8 6.5 26.3 173.0 23.2 10.8 69.4
WGZ040D C76.3 2.9 4.8 8.6 122.1 7.0 7.6 20.9 203.5 18.5 12.7 55.2
WGZ045D D85.3 3.9 5.3 11.6 136.5 9.5 8.5 28.4 227.5 25.1 14.2 74.9
WGZ050D E96.4 3.0 6.0 9.1 154.2 7.4 9.6 22.1 257.0 19.5 16.1 58.4
WGZ055D F105.8 4.1 6.6 12.1 169.2 9.9 10.6 29.6 282.0 26.1 17.6 78.1
WGZ060D G113.4 5.2 7.1 15.4 181.5 12.6 11.3 37.7 302.5 33.3 18.9 99.4
WGZ070D H131.6 4.3 8.2 12.8 210.6 10.5 13.2 31.4 351.0 27.7 21.9 82.8
WGZ080D I146.8 3.9 9.2 11.6 234.9 9.5 14.7 28.4 391.5 25.1 24.5 74.9
WGZ090D J163.3 3.8 10.2 11.3 261.3 9.2 16.3 27.5 435.5 24.3 27.2 72.6
WGZ100D K183.4 3.8 11.5 11.3 293.4 9.2 18.3 27.5 489.0 24.3 30.6 72.6
WGZ115D L237.6 5.0 14.8 15.1 380.1 12.3 23.8 36.8 633.5 32.5 39.6 97.0
WGZ130D M237.6 6.6 14.8 19.8 380.1 16.2 23.8 48.4 633.5 42.8 39.6 127.8
WGZ150D N277.9 6.5 17.4 19.3 444.6 15.8 27.8 47.2 741.0 41.7 46.3 124.7
WGZ170D O317.4 5.7 19.8 17.1 507.9 14.0 31.7 41.8 846.5 37.0 52.9 110.5
WGZ200D P352.7 7.7 22.0 23.0 564.3 18.8 35.3 56.2 940.5 49.6 58.8 148.3
Inch-Pound
S.I.
Minimum Flow & Pr. Drop
Nominal Flow & Pr. Drop
Maximum Flow & Pr. Drop
Inch-Pound
Inch-Pound
S.I.
S.I.
Curve
Ref
Model
Notes: Minimum, nominal, and maximum flows are at a 16º F, 10º F, and 6º F chilled water temperature range respectively at AHRI tons.

OMM 1130-25
Figure 2, Condenser Pressure Drop, WGZ030D – WGZ200D
Unit Model Ref
#
Min. Flow & PD
Nom. Flow & PD
Max. Flow & PD
IP
SI
IP
SI
IP
SI
GPM
Ft.
L/S
kPa
GPM
Ft.
L/S
kPa
GPM
Ft.
L/S
kPa
WGZ030D
A 56.1 2.4 3.5 7.2 89.7 6.3 5.7 18.8 149.5 17.4 9.4 52.0
WGZ035D
B
64.9
3.4
4.1
10.2
103.8
8.6
6.5
25.7
173.0
23.9
10.9
71.4
WGZ040D
C
76.3
2.7
4.8
8.1
122.1
6.9
7.7
20.6
203.5
19.3
12.8
57.7
WGZ045D
D
85.3
3.6
5.4
10.8
136.5
9.2
8.6
27.5
227.5
25.7
14.4
76.8
WGZ050D
E
96.4
2.9
6.1
8.7
154.2
7.5
9.7
22.4
257.0
20.7
16.2
61.9
WGZ055D
F 105.8 3.8 6.7 11.4 169.2 9.7 10.7 29.0 282.0 26.8 17.8 80.1
WGZ060D
G
113.4
4.5
7.2
13.5
181.5
11.6
11.5
34.7
302.5
32.3
19.1
96.5
WGZ070D
H
132.8
4.1
8.4
12.3
212.4
10.4
13.4
31.1
354.0
29.0
22.3
86.7
WGZ080D
I
146.8
3.7
9.3
11.1
234.9
9.5
14.8
28.4
391.5
26.5
24.7
79.2
WGZ090D
J
165.0
3.4
10.4
10.2
264
8.8
16.7
26.3
440.0
24.5
27.8
73.2
WGZ100D
K 183.4 3.4 11.6 10.2 293.4 8.8 18.5 26.3 489.0 24.4 30.9 72.9
WGZ115D
L
211.7
4.8
13.4
14.3
338.7
12.3
21.4
36.8
564.5
34.1
35.6
101.9
WGZ130D
M
235.1
6.1
14.8
18.2
376.2
15.5
23.7
46.3
627.0
43.1
39.6
128.8
WGZ150D
N
274.9
6.2
17.3
18.5
439.8
15.8
27.7
47.2
733.0
43.8
46.2
130.9
WGZ170D
O
317.4
5.5
20.0
16.4
507.9
14.0
32.0
41.8
846.5
38.9
53.4
116.3
WGZ200D
P 352.7 7.4 22.3 22.1 564.3 18.8 35.6 56.2 940.5 52.3 59.3 156.3
Pressure Drop (ft of water)
Flow Rate (GPM)

6WGZ030D through WGZ200D OMM 1130-2
Components
Figure 3, Compressor Locations
NOTE: Models WGZ150 to WGZ200 add a #5 compressor to circuit #1 and a #6 compressor to
circuit #2.
4 2 3 1
Circuit 2 Circuit 1 Control Panel
Evaporator Evaporator and
Condenser
Connections

OMM 1130-27
Unit Configuration
The chiller units have two refrigerant circuits, Models WGZ 030 to WGZ 130 have two tandem scroll
compressors (total of four), a single two-circuited brazed plate evaporator, a single two-circuited water-
cooled condenser, interconnecting refrigerant piping and a control panel with associated sensors and
transducers.
Models WGZ 150 to WGZ 200 have two refrigerant circuits, two trio scroll compressors (total of six), a
single two-circuited shell-and-tube evaporator, a single two-circuited water-cooled condenser,
interconnecting refrigerant piping and a control panel with associated sensors and transducers.
Figure 4, Schematic Piping Diagram (One of Two Circuits for WGZ030D – 130D)
NOTE: WGZ 150 to WGZ 200 have a shell-and-tube evaporator, three compressors per circuit, and
electronic expansion valves.
Comp
#2
Comp
#1
Condenser Condenser
Water
Evaporator
Chilled
Water
SF-D
T
SS
CV
SP
P
1
LWT
T
T
Legend:
Temperature Sensor
Pressure Transducer
Pressure (High Pressure Cutout)
Temperataure Sensor, Leaving
Chilled Water Control
T
T
T
P
P
1
LWT
Relief Valve
Schrader Fitting
Thermal Expansion Valve
Sight Glass / Moisture Indicator
Charging Valve
T
S
CV
SSolenoid Valve
F-D Filter-Drier
Angle Valve
Ball Valve

8WGZ030D through WGZ200D OMM 1130-2
Field Wiring Diagrams
Figure 5, WGZ030DW – WGZ200DW Field Wiring Diagram (Packaged Unit)

OMM 1130-29
Figure 6, WGZ030DA – WGZ200DA Field Wiring Diagram (Remote Condenser)

10 WGZ030D through WGZ200D OMM 1130-2
Control Panel Layout
Table 1, Typical Control Panel, 4-Compressor Unit
NOTES:
1. Additional space provided in the upper right section for optional multiple point power connection and
optional circuit breakers.
2. Front door has a slot opening at the top for access to the MicroTech II controller for viewing display
and making keypad entries without opening the panel door.
Motor Protection Module
The motor protection system consists of an external control module, located on each compressor, motor
terminal box, connected to a series of thermistors located in the motor windings and the compressor
discharge port. If the windings experience an over-temperature condition or the discharge temperature is
excessive, the module will trip and shut off the compressor.
Warning
Disconnect the compressor three-phase power before removing the terminal box cover Removal of the
terminal box cover will expose the three-phase power connections. Contact with them can cause serious
injury or death..
!
(3) 120V/24V
Transformers
LineV/120V
Control
Transformer
Control
Transformer
Fuses, Primary
Control
Transformer Fuse,
Secondary
Optional
Disconnect
Switch
Microtech
Controller
(2) Circuit
Mechanical
Hi-Pressure
Switch Relays
(4) Compressor
Circuit Breakers
(4) Compressor
Contactors
Grounding
Lug
Location for
Optional External
Overloads

OMM 1130-211
Start-Up and Shutdown
Pre Start-up
1. The chilled-water system should be flushed and cleaned. Proper water treatment is required to
prevent corrosion and organic growth.
2. With main disconnect open, check all electrical connections in control panel and starter to be sure
they are tight and provide good electrical contact. Although connections are tightened at the factory,
they can loosen enough in shipment to cause a malfunction.
3. Check and inspect all water piping. Make sure flow direction is correct and piping is made to correct
connection on evaporator and condenser.
4. Open all water flow valves to the condenser and evaporator.
5. Flush the cooling tower and system piping to be sure the system is clean. Start evaporator pump and
manually start condenser pump and cooling tower. Check all piping for leaks. Vent the air from the
evaporator and condenser water circuit, as well as from the entire water system. The cooler circuit
should contain clean, treated, non-corrosive water.
6. Check to see that the evaporator water thermostat sensor is securely installed.
7. Making sure control stop switch S1 is open (off) and pumpdown switches PS1 and PS2 are on
“manual pumpdown,” place the main power and control disconnect switches to “on.” This will
energize the crankcase heaters. Wait a minimum of 12 hours before starting the unit.
8. Check compressor oil level. Prior to start-up, the oil level should cover at least one-third of the oil
sight glass located in the equalizing line between the compressors or on the compressor.
9. Note the water pressure drop across evaporator and condenser on pages 4 and 5 and check that water
flow is correct per the system design flow rates.
10. Check the actual line voltage to the unit to make sure it is the same as called for on the compressor
nameplate, within + 10%, and that phase voltage unbalance does not exceed 3%. Verify that adequate
power supply and capacity is available to handle load.
11. Make sure all wiring and fuses are of the proper size. Also make sure that all interlock wiring is
completed per Daikin Applied diagrams.
12. Verify that all mechanical and electrical inspections by code authorities have been completed.
13. Make sure all auxiliary load and control equipment is operative and that an adequate cooling load is
available for initial start-up.
Start-up
1. Open the compressor discharge shutoff valves until backseated. Always replace valve seal caps.
2. Open the two manual liquid line shutoff valves.
3. Check to see that the unit circuit breakers are in the “off” position.
4. Check to see that the pumpdown switches, PS1 and PS2, are in the “manual pumpdown” position and
the control system switch S1 is in the “off” position.
5. Put the main power and control circuit disconnects to the “on” position.
6. Verify crankcase heaters have operated for at least 12 hours prior to start-up. Crankcase should be
warm to the touch.
7. Check that the MicroTech II controller is set to the desired chilled water temperature.
8. Start the system auxiliary equipment for the installation by turning on the time clock, ambient
thermostat and/or remote on/off switch and water pumps.
9. Check resets of all equipment protection controls.
10. Switch on the unit circuit breakers.
11. Set pumpdown switches PS1 and PS2 to “auto” for restart and normal operation.

12 WGZ030D through WGZ200D OMM 1130-2
12. Start the system by setting the system switch S1 to on.
13. After running the unit for a short time, check the oil level in each compressor crankcase, rotation of
condenser fans (if any), and check for flashing in the refrigerant sight glass.
14. After system performance has stabilized, it is necessary that the “Compressorized Equipment
Warranty Form” (Form No. 206036A) be completed to establish commencement of the warranty
period. Be sure to list the pressure drop across both vessels. This form is shipped with the unit and
after completion should be returned to Daikin Applied service department through your sales
representative.
Weekend or Temporary Shutdown
Move pumpdown switches PS1 and PS2 to the “manual pumpdown” position. After the compressors have
pumped down, turn off the chilled water pump. Note: With the unit in this condition, it will not restart
until these switches are turned back on. The unit has one-time pumpdown. It is important that the
compressors pump down before the water flow to the unit is interrupted to avoid freeze-up in the
evaporator.
Leave S1 on and power to the unit so that the crankcase heaters will remain energized.
Start-up after Temporary Shutdown
1. Start the water pumps.
2. With the control system switch S1 in the “on” position, move the pumpdown switches PS1 and PS2 to
the “auto pumpdown” position.
3. Observe the unit operation for a short time, noting unusual sounds or possible cycling of compressors.
4. Check compressor crankcase heaters.
Extended Shutdown
Close the manual liquid line shutoff valves.
After the compressors have pumped down, turn off the water pumps.
Turn off all power to the unit.
Move the control service switch S1 to the “off” position.
Close the discharge shutoff valves on the compressor(s) and the liquid outlet valves at the condenser.
Tag all opened disconnect switches to warn against start-up before opening the compressor suction and
discharge valves.
Drain all water from the unit evaporator, condenser, and chilled water piping if the unit is to be shut down
during the winter and exposed to below freezing temperatures. Do not leave the vessels or piping open to
the atmosphere over the shutdown period.
Start-up after Extended Shutdown
1. Inspect all equipment to see that it is in satisfactory operating condition.
2. Remove all debris that has collected on the surface of the condenser coils (remote condenser models)
or check the cooling tower, if present.
3. Backseat the compressor discharge valves.Always replace valve seal caps.
4. Open the manual liquid line shutoff valves.
5. Check circuit breakers. They must be in the “off” position.
6. Check to see that the pumpdown switches PS1 and PS2 are in the “manual shutdown” position and
the control system switch S1 is in the “off” position.
7. Put the main power and control circuit disconnects to the “on” position.
8. Allow the crankcase heaters to operate for at least 12 hours prior to start-up.
9. Start the chilled water pump and purge the water piping as well as the evaporator in the unit.
10. Start the system auxiliary equipment for the installation by turning on the time clock, ambient
thermostat and/or remote on/off switch.

OMM 1130-213
11. Check that the MicroTech II controller is set to the desired chilled water temperature.
12. Check resets of all equipment protection controls.
13. Switch the unit circuit breakers to “on.”
14. Start the system by setting the system switch S1 to “on.”
CAUTION
Most relays and terminals in the control center are powered when S1 is closed and the
control circuit disconnect is on. Therefore, do not close S1 until ready for start-up or
serious equipment damage can occur.
15. Set pumpdown switches PS1 and PS2 to the “auto pumpdown” position for restart and normal
operation.
16. After running the unit for a short time, check the oil level in the compressor oil sight glass or in the
compressor’s equalizing lines for flashing, indicating possible refrigerant in the oil.
Low Ambient Start
The low ambient start logic is for starting units with remote air-cooled condensers during periods of low
ambient air temperatures.
A low ambient start takes place if the saturated condenser temperature is less than 85.0°F when the first
compressor starts. The low ambient start is active for a time defined by the Low OAT Start Timer set
point. This set point is found on screen three in the alarm set points menus.
During the low ambient start, the freezestat logic for the low-pressure stop alarm and the low-pressure
events are disabled. The low-pressure stop alarm can still be triggered if the evaporator pressure drops
below 5.0 psi at any time while the circuit is in the ‘Run’ state. Also, during the low ambient start, the
second compressor is not allowed to start. The evaporator pressure is checked at the end of the low
ambient start time frame. If the pressure is less than the Low Pressure Unload set point, then the low
ambient start is not successful and the compressor will shut off. This will not be a manual reset alarm
until three consecutive attempts have failed. The circuit alarm triggered after the third failed attempt is a
Low OAT Restart fault. The Low OAT Restart faults are Circuit alarms so each circuit will attempt to start
either compressor three times before the Low OAT Restart fault is indicated.
Fan High Ambient Rapid Start
The following logic exists to get condenser fans started earlier than normal during unit starts with warm
ambient air temperatures.
•If the outside air temperature higher than 75.0°F the condenser fan staging logic changes to bring on
the first fan on when the condenser pressure is greater than 140 psi.
•The standard condenser fan staging logic would start the first condenser fan when the condenser
pressure is higher than 200.0 psi.
•The last condenser fan on each circuit will not shut down until the condenser pressure drops below
140.0 psi regardless of the outside air temperature
Sequence of Operation
The following sequence of operation is typical for WGZ water chiller models. The sequence can vary
slightly depending upon options.
Compressor Heaters
With the control circuit power on and the control stop switch S1 off, 115V power is applied through the
control circuit fuse Fl to the compressor crankcase heaters HTR1, HTR2, HTR3, and HTR4.
Start-up/Compressor Staging
When compressors start and stop.
Stage Up Temp is the LWT temperature at which the next compressor to start will stage up (start) after at
least one compressor on the unit has started and is running.
!

14 WGZ030D through WGZ200D OMM 1130-2
4
1
.
5
°
F
4
0
.
0
°
F
3
8
.
5
°
F
½
D
B
½
D
B
E
W
T
5
0
.
0
°
F
1
0
.
0
°
F
4
0
.
0
°
F
E
v
a
p
D
e
l
t
a
-
T
S
e
t
L
W
T
S
e
t
S
t
a
r
t
D
e
l
t
a
T
46.5°F
36.5°F
Stop Delta T
Start Up Temp is the LWT at which the first compressor starts. The start up temperature equals the stage
up temperature plus the Start Delta temperature. A high Start Delta will keep the unit off longer and
reduce unit cycling at low loads. However, this high Start Delta will cause a larger excursion from the
LWT setpoint before the unit starts.
Stated another way, the Start Delta is the number of degrees above the Evap LWT setpoint, plus ½ the
Dead Band, that determines when the first compressor starts. The Start Delta is in effect for only the first
start after all compressors have been off. Additional compressor starts and stops are determined by the
LWT in respect to the dead band only. The dead band is automatically set at 30% of the EvapDeltaT
selected in menu 3. The following sequence would occur for the settings shown below:
EvapDelta T=10.0°F Dead Band=3.0°F StartDelta=5.0°F StopDelta=2.0°F LWT=40.0°F
Figure 7, Staging/Starting Temperatures For a warm start-up (no compressors
running), the first compressor will start at any
temperature above 46.5°F. Each subsequent
compressor will start after the Stage Up
Timer has timed out and if the temperature is
above the dead band, 41.5°F in this case.
If the LWT stays above 41.5°F, all of three (or
5) remaining compressors will eventually
stage on after the Stage Up Timer times out
between each stage.
At some point, the chilled water temperature will be dropping and begin to approach the point when
compressors should begin staging off, which is the LWT setpoint minus ½ of the Dead Band, 38.5°F in
this case. If the LWT remains below LWT setpoint minus ½ Dead Band and the Stage Down Timer times
out, additional compressors will stage off. The last compressor will stage off when the LWT falls below
the LWT Setpoint minus ½ the Dead Band minus the Stop Delta T. The stop Delta T is in effect for only
the last compressor running.
If the temperature climbs above 38.5°F all running compressors will remain on. No compressor staging
occurs within the Dead Band. The next-on compressor will start when the chilled water temperature
reaches 41.5°F and the Stage Up Timer times out.
However, in some circumstances this methodology can cause the LWT to drop to dangerously low levels,
with the evaporating temperature below the freeze point, before stopping. In the example shown in
Figure 7, the Shutdown Temp (last compressor off) would be 36°F.
This would result in a refrigerant evaporating temperature approaching freezing, so the rule is amended to
read: If the Cool Leaving Water Temperature (LWT) set point is less than half the Control Band
above 39.0°F the Stage Down temperature is calculated as:
Stage Down Temperature = Cool LWT – (Cool LWT - 39.0
° F), and the
Shutdown Temperature = Cool LWT – (Cool LWT - 39.0
° F) – Stop Delta T
This keeps the Stage Down Temp above 39°F and the Shutdown Temp above 36°F, as the maximum Stop
Delta T allowed is 3-degrees.
Which compressor starts and stops. One compressor per circuit will start before starting the second
compressor (or third) on any circuit. In other words, the compressor with the lowest number of starts will
start first. The compressor with the lowest number of starts on the other circuit will start next, so that one
compressor on each circuit will be running. The third compressor on will be the compressor on either
circuit with the fewest starts. The remaining compressor will be the last on. If a circuit is unavailable for
any reason, the second compressor on the operating circuit will stage on. Only two (or three)
compressors (on the one circuit) will be operating.
There is a 150 second delay after power-up before any compressor is allowed to start.

OMM 1130-215
When staging down, one compressor on each circuit will be left on until each circuit has only one
compressor running. In other words, the compressor, on either circuit, with the most run-hours will stop
first. The compressor with the most run-hours on the other circuit will stop next. One compressor on
each circuit will be running. The third compressor off will be the one, on either circuit, with the most
run-hours. The remaining compressor will be the last off. See the following description of pumpdown.
Table 2, Staging in Cool and Glycol Mode
Description
Occurs When:
Action Taken
Stage #1 ON
(See Notes
Below)
Lvg Evap T > Evap LWT SP + (DB/2) +
Startup Delta T Available compressor with least starts, ON
Stage #2 ON
After Stage Up Delay times out then, LVG
Evap T > Evap LWT SP + (DB/2)
Available compressor on the other
circuit with least starts, ON
Stage #3 ON After Stage Up Delay times out, then LVG
Evap T > Evap LWT SP + (DB/2)
Available compressor on either circuit
with least starts, ON
Stage #4 ON
After Stage Up Delay times out then, LVG
Evap T > Evap LWT SP + (DB/2) Remaining compressor, ON
Stage #4 OFF After Stage Down Delay times out then, LVG
Evap T < Evap LWT SP – (CB/2)
Compressor with most run hours, OFF
Stage #3 OFF
After Stage Down Delay times out then, LVG
Evap T < Evap LWT SP – (DB/2)
Compressor on the other circuit with
most run hours, OFF
Stage #2 OFF
After Stage Down Delay times out then, LVG
Evap T < Evap LWT SP – (DB/2)
Compressor on either circuit with most
run hours, OFF
Stage #1 OFF
After Stage Down Delay times out then, LVG
Evap T < Evap LWT SP – (DB/2)-StopDelta T
Remaining compressor, OFF
Note 1: DB (Dead Band) = Evap Water Delta T x .3
Manual Compressor Disable Logic
Logic is available that allows the operator to manually enable and disable compressors. When a
compressor is disabled, it is considered unavailable to start in the staging logic. This allows a damaged
compressor to be taken offline while the remaining compressor can still provide some cooling
•The Compressor Disable set points are found on Compressor Set Points screens three and four.
•A running compressor cannot be disabled until it has been shutdown.
•If all of the compressors on a circuit are disabled, then the circuit will be disabled.
•If both circuits have all of their compressors disabled, then the Unit State will remain Off
Automatic Pumpdown
WGZ units are equipped with single pumpdown control. When the last compressor running on either
circuit is ready to shut off, the liquid line solenoid valve (LLSV) is closed first and the compressor
continues to run until the pumpdown pressure is reached, at which time the compressor shuts off. The
shut off pressure is set at 15 psi below the Low Evaporator pressure Unload setpoint.
When the first compressor on a circuit starts, the LLSV opens simultaneously.
Manual Pumpdown
When the Pumpdown Switch is in the pumpdown position, all compressors except #1 and #2 will shut off.
Then the Liquid Line and Hot Gas Bypass Valves will close. The operating compressor will pump out the
refrigerant. When the Suction Pressure is at 40 psig, the compressors will stop.
Chilled Water and Condenser Water Pumps
The chiller MicroTech II controller can be programmed to start and stop the system chilled water and
condenser water pumps. They may also be controlled by the BAS or manually. Programming directions
and the sequence of operation can be found beginning on page 38.
Cooling Tower Control
The cooling tower fans and/or the tower bypass valve can be controlled by the MicroTech II controller.
This provides a simple and direct method to control the unit’s discharge pressure. Programming

16 WGZ030D through WGZ200D OMM 1130-2
directions and the sequence of operation can be found on page 65. Some means of discharge pressure
control must be installed if the condenser water temperature can fall below 60°F (16°C).
Condenser Fan Control
Model AC chillers equipped with air-cooled or evaporative-cooled condensers usually require some form
of discharge pressure control. The MicroTech II controller can be programmed to provide this function
by cycling condenser fans based on the unit discharge pressure. Directions on the pressure settings can be
found on page 65. The following charts illustrate how four controller outputs can control six fan steps.
Circuit 1
Number of Fans = 4 Number of fans = 6 Number of fans = 8
Stage #
Fan
1
Fan
3
Stage #
Fan
1
Fan
3
Fan
5
Stage #
Fan
1
Fan
3
Fan
5
Fan
7
1
ON
1
ON
1
ON
2
ON
ON
2
ON
ON
2
ON
ON
3
ON
ON
ON
3
ON
ON
ON
4
ON
ON
ON
ON
Number of fans = 8 (R410A)Number of fans = 10 (R410A)Number of fans = 12
Stage #
Fan
1
Fan
3
Fan
5&7
Stage #
Fan
1
Fan
3
Fan
5&7
Fan
9
Stage #
Fan
1
Fan
3
Fan
5&7
Fan
9&11
1
ON
1
ON
1
ON
2
ON
ON
2
ON
ON
2
ON
ON
3
ON
ON
3
ON
ON
3
ON
ON
4
ON
ON
ON
4
ON
ON
ON
4
ON
ON
ON
5
ON
ON
ON
ON
5
ON
ON
ON
6
ON
ON
ON
ON
Circuit 2
Number of Fans = 4 Number of fans = 6 Number of fans = 8
Stage #
Fan
2
Fan
4
Stage #
Fan
2
Fan
4
Fan
6
Stage #
Fan
2
Fan
4
Fan
6
Fan
8
1
ON
1
ON
1
ON
2
ON
ON
2
ON
ON
2
ON
ON
3
ON
ON
ON
3
ON
ON
ON
4
ON
ON
ON
ON
Number of fans = 8 (R410A)Number of fans = 10 (R410A)Number of fans = 12
Stage #
Fan
2
Fan
4
Fan
6&8
Stage #
Fan
2
Fan
4
Fan
6&8
Fan
10
Stage #
Fan
2
Fan
4
Fan
6&8
Fan
10&12
1
ON
1
ON
1
ON
2
ON
ON
2
ON
ON
2
ON
ON
3
ON
ON
3
ON
ON
3
ON
ON
4
ON
ON
ON
4
ON
ON
ON
4
ON
ON
ON
5
ON
ON
ON
ON
5
ON
ON
ON
6
ON
ON
ON
ON
ICE
In ICE mode, the compressors stage to 100% load until the LWT is less than the ICE LWT SP. Then
Compressors #3 and #4 shut down. Following that, Compressors #1 and #2 shut down after going
through normal pumpdown on both circuits. There is a programmable, start-to-start, Ice Mode Start
Delay that limits the frequency of starts when in the ice mode. The timer can be manually cleared to
force a restart.

OMM 1130-217
MicroTech II Controller
Controller Software Version
This manual is based on software version WGZD20102F. The “02F” is the version descriptor. The
version installed in a unit can be viewed by pressing the MENU and ENTER keys simultaneously, then
pressing MENU to return to the regular menu screen.
General Description
The MicroTech II controller’s state-of-the-art design will not only permit the chiller to run more
efficiently but will also simplify troubleshooting if a system failure occurs. Every MicroTech II controller
is programmed and tested prior to shipment to assist in a trouble-free start-up. The MicroTech II
controller can be used to cycle fans on remote air-cooled condensers for head pressure control when the
setpoint Water Cooled=N is selected in one of the setpoint menu screens. Water Cooled=Y sets the chiller
for operation with the water-cooled condenser.
Operator Friendly
The MicroTech II controller menu structure is separated into three distinct categories, which provide the
operator or service technician with a full description of
1. current unit status,
2. control parameters (setpoints)
3. alarms. Security protection prevents unauthorized changing of the setpoints and control parameters.
The MicroTech II controller continuously performs self-diagnostic checks, monitoring all system
temperatures, pressures and protection devices, and will automatically shutdown a compressor, a
refrigerant circuit or the entire unit should a fault occur. The cause of the shutdown and date stamp are
retained in memory and can be easily displayed in plain English for operator review, which is an
extremely useful feature for troubleshooting. In addition to displaying alarm diagnostics, the MicroTech
II chiller controller also provides the operator with a warning of pre-alarm conditions.
Staging
The four scroll (or six) compressors are staged on and off as a function of leaving chilled water
temperature, number of starts and run-hours. See Sequence of Operation.
Equipment Protection
The unit is protected by alarms that shut it down and require manual reset, and also by limit alarms that
limit unit operation in response to some out-of-limit condition. Shut down alarms activate an alarm signal
that can be wired to a remote device.
Unit Enable Selection
Enables unit operation from local keypad or digital input
Unit Mode Selection
Selects standard cooling, ice, glycol, or test operation mode

18 WGZ030D through WGZ200D OMM 1130-2
Keypad/Display
A 4-line by 20-character/line liquid crystal display and 6-key keypad is mounted on the unit controller. Its
layout is shown below.
Figure 8, Keypad and Display in MENU Mode
The four arrow keys (UP, DOWN, LEFT, RIGHT) have three modes of use.
Scroll between data screens as indicated by the arrows (default mode).
Select a specific data screen in a hierarchical fashion using dynamic labels on the right side of the display
(this mode is entered by pressing the MENU key).
Change field values in edit mode according to the following table:
LEFT Default RIGHT Cancel
UP Increment DOWNDecrement
These four edit functions are indicated by one-character abbreviation on the right side of the display (this
mode is entered by pressing the ENTER key).
Inputs/Outputs
Table 3, Analog Inputs
C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit, *n = Refrig. Dependent
#
Description
Type
Signal Source
Range
*1
Evaporator Refrigerant Pressure #1 (R134a,R22)
C1
0.1 to 0.9 VDC
0 to 132 psi
*1
Evaporator Refrigerant Pressure #1
(R410a)
C1
0.1 to 0.9 VDC
0 to 350 psi
*2
Evaporator Refrigerant Pressure #2 (R134a,R22)
C2
0.1 to 0.9 VDC
0 to 132 psi
*2
Evaporator Refrigerant Pressure #2 (R410a)
C2
0.1 to 0.9 VDC
0 to 350 psi
*3
Condenser Refrigerant Pressure #1 (R134a,R22)
C1
0.1 to 0.9 VDC
3.6 to 410 psi
*3
Condenser Refrigerant Pressure #1 (R410a)
C1
0.1 to 0.9 VDC
0 to 700 psi
4 Leaving Evaporator Water Temperature UT NTC Thermister
(10k@25°C)
-58 to 212°F
5
Condenser Entering Water Temperature or Outside Ambient
Temperature (See Note below)
UT NTC Thermister
(10k@25°C)
-58 to 212°F
*6
Condenser Refrigerant Pressure #2 (R134a,R22)
C2
0.1 to 0.9 VDC
3.6 to 410 psi
*6
Condenser Refrigerant Pressure #2 (R410a)
C2
0.1 to 0.9 VDC
0 to 700 psi
7
Reset of Leaving Water Temperature
UT
4-20 mA Current
0-(10 to 80°F)
8
Demand Limit (R22, R410A)
UT
4-20 mA Current
0-100 % Load
9 Compressor Suction Temperature #1 C1 NTC Thermister
(10k@25°C)
-58 to 212°F
10 Compressor Suction Temperature #2 C2 NTC Thermister
(10k@25°C)
-58 to 212°F
Notes:
1. If Water Cooled = Y, then Entering Condenser. If Water Cooled = N, then Outside Ambient.
2. Selection of R134a in unit setpoint screen will modify unit operation for Templifier application.
Air Conditioning
ALARM
VIEW
SET
<
<
<
Menu Key
Key to Screen Pathway
"Enter" Key
Arrow Keys

OMM 1130-219
Table 4, Analog Outputs
#
Description
Output Signal
Range
1
Cooling Tower Bypass Valve Position
0 to 10 VDC
0 to 100% Open
2
Cooling Tower VFD Speed
0 to 10 VDC
0 to 100%
3 Circuit #1 Electronic Expansion Valve 0 to 10 VDC 0 to 100%
4
Circuit #2 Electronic Expansion Valve
0 to 10 VDC
0 to 100%
NOTE: Analog outputs 3 & 4 are for R410A and R134a units only.
Table 5, Digital Inputs
The following parameters are digital inputs to this controller.
C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit, *n = Refrigerant Dependent
#
Description
Type
Signal
Signal
1
Unit OFF Switch
UT
0 VAC (Stop)
24 VAC (Auto)
2
Pump Down Switch #1
C1
0 VAC (Stop)
24 VAC (Start)
3
Evaporator Water Flow Switch
UT
0 VAC (No Flow)
24 VAC (Flow)
*4
Motor Protection #1 C1 0 VAC (Fault) 24 VAC (No Fault)
*4
Open
5
Open
6
Pump Down Switch #2
C2
0 VAC (Stop)
24 VAC (Start)
*7
Motor Protection #2
C2
0 VAC (Fault)
24 VAC (No Fault)
*7
Open
*8
Open
*8
Condenser Water Flow Switch (R134a,R410a)
UT
0 VAC (No Flow)
24 VAC (Flow)
9
Phase Voltage Fault #1 (See Note 1 Below)
C1
0 VAC (Fault)
24 VAC (No Fault)
10
Phase Voltage Fault #2 (See Note 1 Below)
C2
0 VAC (Fault)
24 VAC (No Fault)
11
Ground Fault Prot. #1 (See Note 2 Below)
C1
0 VAC (Fault)
24 VAC (No Fault)
12
Ground Fault Prot. #2 (See Note 2 Below)
C2
0 VAC (Fault)
24 VAC (No Fault)
13
Remote Start/Stop UT 0 VAC (Stop) 24 VAC (Start)
*14
Condenser Water Flow Switch
UT
0 VAC (No Flow)
24 VAC (Flow)
*14
Open
(
*15
Open
*15
Motor Protection #1
(R134a,R410a)
C1
0 VAC (Fault)
24 VAC (No Fault)
*16
Open
*16
Motor Protection #2
(R134a,R410a)
C2 0 VAC (Fault) 24 VAC (No Fault)
17
Ice Mode Switch
UT
0 VAC (Normal)
24 VAC (Ice)
18
Heat Mode Switch
UT
0 VAC (Normal)
24 VAC (Heat)
Notes:
1. See Safety Alarms Table for “Phase Voltage Protection”. Units with single point electrical connection will have one PVM with
Inputs 9 and 10 wired together. Units with multiple point connection will have two PVM’s with Input 9 for Electrical Circuit #1 and
Input 10 for Electrical Circuit #2.
2. See Safety Alarms Table for “Ground Fault Protection”. Units with single point electrical connection will have one GFP with
Inputs 11 and 12 wired together. Units with multiple point connection will have two GFP’s with Input 11 for Electrical Circuit #1
and Input 12 for Electrical Circuit #2.
Table 6, Digital Outputs
The following parameters are digital outputs from this controller.
C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit, *n = Refrigerant Dependent
#
Description
Type
Load
Output OFF
Output ON
1
Alarm
C1,C2,UT
Alarm Indicator
Alarm OFF
Alarm ON
2
Evaporator Water Pump
UT
Pump Contactor
Pump OFF
Pump ON
3 Condenser Fan #1 – Water Cooled = N /
Condenser Water Pump – Water Cooled = Y
C1 / UT Fan Contactor/
Pump Contactor
Fan OFF Fan ON
4
Motor Control Relay #1 = Compr#1 C1 Starter Compressor OFF Compressor ON
Continued next page.

20 WGZ030D through WGZ200D OMM 1130-2
Table 6, Continued
#
Description
Type
Load
Output OFF
Output ON
5
Motor Control Relay #3 = Compr#3
C1
Starter
Compressor OFF
Compressor ON
*6 Condenser Fan #3– Water Cooled =N /Tower Fan
#2-Water Cooled=Y
C1 /
UT
Fan Contactor Fan OFF Fan ON
*6
Motor Control Relay #5 = Compr#5
(R134a,R410a)
C1 Starter Compressor OFF Compressor ON
7
Liquid Line #1
C1
Solenoid
Cooling OFF
Cooling ON
8 Condenser Fan #2 – Water Cooled =N /Tower Fan
#1-Water Cooled=Y C2 / UT Fan Contactor Fan OFF Fan ON
9
Motor Control Relay #2 = Compr#2
C2
Starter
Compressor OFF
Compressor ON
10
Motor Control Relay #4 = Compr#4
C2
Starter
Compressor OFF
Compressor ON
*11
Condenser Fan #4
C2
Fan Contactor
Fan OFF
Fan ON
*11
Motor Control Relay #6 = Compr#6
(R134a,R410a)
C2 Starter Compressor OFF Compressor ON
12
Liquid Line #2
C2
Solenoid
Cooling OFF
Cooling ON
13
Condenser Fan #5 C1 Fan Contactor Fan OFF Fan ON
14
Hot Gas Bypass #1
C1
Solenoid
Cooling OFF
Cooling ON
15
Hot Gas Bypass #2 C2 Solenoid Cooling OFF Cooling ON
*16
Condenser Fan #6
C2
Fan Contactor
Fan OFF
Fan ON
*16
Condenser Fan #4 C2 Fan Contactor Fan OFF Fan ON
*17
Condenser Fan #7
C1
Fan Contactor
Fan OFF
Fan ON
*17
Condenser Fan #5&7
(R134a,R410a)
C1 Fan Contactor Fan OFF Fan ON
18
Condenser Fan #8
C2
Fan Contactor
Fan OFF
Fan ON
18
Condenser Fan #6&8
C2
Fan Contactor
Fan OFF
Fan ON
Expansion I/O Controller
Digital Outputs
The following parameters are digital outputs from this controller.
Types: C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit
#
Description
Type
Output Off
Output On
1
Evap Water Pump Output #2 UT Pump Off Pump On
2
Cond Water Pump Output #2
UT
Pump Off
Pump On
3
Condenser Fan #9
C1
Fan OFF
Fan ON
4
Condenser Fan #10
C2
Fan OFF
Fan ON
Analog Inputs
The following parameters are digital outputs from this controller for Templifier operation only.
Types: C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, & UT = Unit
#
Description
Type
Output Off
Output On
1 Entering Evaporator Water Temperature
(R134a)
UT NTC Thermister
(10k@25°C)
-58 to 212°F
2
Demand Limit (R134a)
UT
4-20 mA Current
0-100 % Load
3 Liquid Line Temperature #1 (R134a) C1 NTC Thermister
(10k@25°C) -58 to 212°F
4 Liquid Line Temperature #2 (R134a) C2 NTC Thermister
(10k@25°C)
-58 to 212°F