Daikin WGZ045DW, WGZ035DW, WGZ050DW, WGZ055DW, WGZ060DW Operating And Maintenance Manual

...

Operating and Maintenance Manual

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

OMM 1130-2

Group: Chiller Part Number: OMM1130-2

Date: March 2014

Table of Contents

Introduction ....................................... 3

General D

Nomenclature ........................................ 3

Water Pressure Drop ............................. 3

Components .......................................... 6

escription .............................. 3

Unit Configuration ............................ 7

Field W ir

Control Panel Layout .......................... 10

Motor Protection Module .................... 10

ing Diagrams .......................... 8

Start-Up and Shutdown .................. 11

Sequence of Operation .................... 13

Start-up/C

ompressor Staging .............. 13

MicroTech II Controller .................. 17

Control

General Description ............................ 17

Expansion I/O Controller .................... 20

Setpoints .............................................. 21

Automatic Ad justed Limits ................. 23

Dynamic Defaults ............................... 24

ler Software Version ................ 17

Events & Alarms .............................. 24

Unit St

Limit Events ........................................ 28

op Alarms ................................. 24

Controller Operation ....................... 31

EXV Cont

rol ....................................... 49

Using the Controller ........................ 51

Menu Screen

Menu Descriptions .............................. 53

s ...................................... 52

BAS Interface .................................. 72

Parameter D

etails ................................ 73

Compressor Motor protection

Module.............................................. 76

Optional Controls ............................ 78

Voltage Monitor (Optional) ...... 78

Phase/

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

Troubles

hooting Chart ........................ 84

Warranty Statement ....................... 85

Products manufactured in an ISO Certified facility

Cover Picture: WGZ130DW without piping insulation installed for clarity

™® The followi ng are trad emarks or regist ered trademar ks of their respective companies: BA LonTalk, L granted by Echelon Corporation; Compliant Scroll from Copeland Corporation; Modbus from Schneider Electric;, MicroTech II, Open Choices from Daikin Applied.

ONWORKS, and the LONMARK logo are managed, granted and used by LONMARK International under a license

Cnet from ASHRAE ;

LONMARK,

2 OMM 1130-2

Introduction

Water-Cooled

Global Design

Scroll Compressor

Nominal Capacity (Tons)

W = Water-Cooled Cond. Design Vintage

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 (WGZDW), and complete refrigerant piping.

Uni

ts 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

A = Unit Less Cond.

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.

OMM 1130-2 3

Figure 1, Evaporator Pressure Drop, WGZ030D – WGZ200D

GPM Ft L/S kPa GPM Ft L/S kPa GPM Ft L/S kPa

WGZ030D A 56.3 2.6 3.5 7.7 90.0 6.3 5.6 18.8 150.0 16.6 9.4 49.7 WGZ035D B 64.9 3.6 4.1 10.8 103.8 8.8 6.5 26.3 173.0 23.2 10.8 69.4 WGZ040D C 76.3 2.9 4.8 8.6 122.1 7.0 7.6 20.9 203.5 18.5 12.7 55.2 WGZ045D D 85.3 3.9 5.3 11.6 136.5 9.5 8.5 28.4 227.5 25.1 14.2 74.9 WGZ050D E 96.4 3.0 6.0 9.1 154.2 7.4 9.6 22.1 257.0 19.5 16.1 58.4 WGZ055D F 105.8 4.1 6.6 12.1 169.2 9.9 10.6 29.6 282.0 26.1 17.6 78.1 WGZ060D G 113.4 5.2 7.1 15.4 181.5 12.6 11.3 37.7 302.5 33.3 18.9 99.4 WGZ070D H 131.6 4.3 8.2 12.8 210.6 10.5 13.2 31.4 351.0 27.7 21.9 82.8 WGZ080D I 146.8 3.9 9.2 11.6 234.9 9.5 14.7 28.4 391.5 25.1 24.5 74.9 WGZ090D J 163.3 3.8 10.2 11.3 261.3 9.2 16.3 27.5 435.5 24.3 27.2 72.6 WGZ100D K 183.4 3.8 11.5 11.3 293.4 9.2 18.3 27.5 489.0 24.3 30.6 72.6 WGZ115D L 237.6 5.0 14.8 15.1 380.1 12.3 23.8 36.8 633.5 32.5 39.6 97.0 WGZ130D M 237.6 6.6 14.8 19.8 380.1 16.2 23.8 48.4 633.5 42.8 39.6 127.8 WGZ150D N 277.9 6.5 17.4 19.3 444.6 15.8 27.8 47.2 741.0 41.7 46.3 124.7 WGZ170D O 317.4 5.7 19.8 17.1 507.9 14.0 31.7 41.8 846.5 37.0 52.9 110.5 WGZ200D P 352.7 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.

Minim um Fl ow & Pr. Drop

Nominal Fl ow & Pr. Drop

Maxim um Fl ow & Pr. Drop

Inch-Pound

S.I.

Curve

Ref

Model

Note

s: Minimum, nominal, and maximum flows are at a 16º F, 10º F, and 6º F chilled water temperature range respectively at AHRI tons.

4 WGZ030D through WGZ200D OMM 1130-2

Figure 2, Condenser Pressure Drop, WGZ030D – WGZ200D

Min. Flow & PD

Nom. Flow & PD

Max. Flow & PD

GPM

Ft.

L/S

kPa

GPM

Ft.

L/S

kPa

GPM

Ft.

L/S

kPa

WGZ030D

WGZ035D

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

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

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

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

WGZ060D

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

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

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

165.0

3.4

10.4

10.2

264

8.8

16.7

26.3

440.0

24.5

27.8

73.2

WGZ100D

WGZ115D

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

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

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

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

Pressure Drop (ft of water)

Flow Rate (GPM)

Unit Model

Ref

56.1 2.4

B C D E F

105.8 3.8

G H

183.4 3.4 11.6 10.2 293.4 8.8 18.5 26.3 489.0 24.4 30.9 72.9

L M N O P

352.7 7.4

3.5 7.2

6.7 11.4

22.3 22.1

89.7 6.3

169.2 9.7

564.3 18.8

5.7 18.8

10.7 29.0

35.6 56.2

149.5 17.4

282.0 26.8

940.5 52.3

9.4 52.0

17.8 80.1

59.3 156.3

OMM 1130-2 5

Components

4 2 3

Circuit 2 Circuit 1

Control Panel

Evaporator

Evaporator and Condenser Connections

Figure 3, Compressor Locations

NOTE:

Models WGZ150 to WGZ200 add a #5 compressor to circuit #1 and a #6 compressor to

circuit #2.

6 WGZ030D through WGZ200D OMM 1130-2

Unit Configuration

Comp

Condenser

Water

Evaporator

Chilled

Water

F-D

LWT

Legend:

Temperature Sensor Pressure Transducer Pressure (High Pressure Cutout) Temperataure Sensor, Leaving

Chilled Water Control

T T

LWT

Relief Valve Schrader Fitting Thermal Expansion Valve Sight Glass / Moisture Indicator Charging Valve

Solenoid Valve

F-D

Filter-Drier

Angle Valve

Ball Valve

The chiller units have two ref rigerant cir cuits, 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 watercooled 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: W electronic expansion valves.

GZ 150 to WGZ 200 have a shell-and-tube evaporator, three compressors per circuit, and

OMM 1130-2 7

Field Wiring Diagrams

Figure 5, WGZ030DW – WGZ200DW Field Wiring Diagram (Packaged Unit)

8 WGZ030D through WGZ200D OMM 1130-2

Figure 6, WGZ030DA – WGZ200DA Field Wiring Diagram (Remote Condenser)

OMM 1130-2 9

Control Panel Layout

Warning

(3) 120V/24V

LineV/120V

Control

Control Optional

Switch

Microtech

(2) Circuit

(4) Compressor

Grounding

Location for

Table 1, Typical Control Panel, 4-Compressor Unit

Controller

Mechanical

Hi-Pressure

Switch Relays

Circuit Breakers

Contactors

Optional External

Overloads

Transformers

Control Transformer

Transformer Fuses, Primary

Transformer Fuse, Secondary

Disconnect

Lug

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.

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..

10 WGZ030D through WGZ200D OMM 1130-2

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. Veri

13. Make sure all auxiliary load and control equipment is operative and that an adequate cooling load is

fy that all mechanical and electrical inspections by code authorities have been completed.

available for in it ia l st ar t-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.

OMM 1130-2 11

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 outle t valv es at the condense r. 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.

12 WGZ030D through WGZ200D OMM 1130-2

11. Check that the MicroTech II controller is set to the desired chilled water temperature.

CAUTION

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.”

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 temperatu re

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.

OMM 1130-2 13

41.5°

40.0°

38.5°

½DB

EWT

50.0°

10.0°

40.0°

EvapDelta-TSetLWT

StartDeltaT

46.5°F

36.5°F

Stop Delta T

t Up Temp is the LWT at which the first compressor starts. The start up temperature equals the stage

Star

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, t his 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 Shutdown Temperature = Cool LWT – (Cool LWT - 39.0

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.

14 WGZ030D through WGZ200D OMM 1130-2

F), and the

F) – Stop Delta T

When staging down, one compressor on each circuit will be left on until each circuit has only one

Description

Occurs When:

Action Taken

Below)

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

Evap T > Evap LWT SP + (DB/2)

with least starts, ON

After Stage Up Delay times out then, LVG

Evap T < Evap LWT SP – (CB/2)

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

After Stage Down Delay times out then, LVG

Evap T < Evap LWT SP – (DB/2)

Compressor on either circuit with most

run hours, OFF

After Stage Down Delay times out then, LVG

Evap T < Evap LWT SP – (DB/2)-StopDelta T

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

Stage #1 ON

(See Notes

Stage #2 ON Stage #3 ON

Stage #4 ON Stage #4 OFF Stage #3 OFF Stage #2 OFF Stage #1 OFF

Note 1: DB (Dead Band) = Evap Water Delta T x .3

Lvg Evap T > Evap LWT SP + (DB/2) +

Startup Delta T

After Stage Up Delay times out, then LVG

Evap T > Evap LWT SP + (DB/2)

After Stage Down Delay times out then, LVG

Available compressor with least starts,

Available compressor on either circuit

Remaining compressor, ON

Compressor with most run hours, OFF

Remaining compressor, OFF

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

OMM 1130-2 15

directions and the sequence of operation can be found on page 65. Some means of discharge pressure

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

ON 2 ON

3 ON

ON 3 ON

Stage #

5&7

Stage #

5&7

Stage #

5&7

9&11 1 ON 1 ON 1 ON

ON 2 ON

ON 3 ON

ON 4 ON

ON 5 ON

ON 6 ON

Stage #

Fan 2 Fan 4

Stage #

Fan 2 Fan 4 Fan 6

Stage #

Fan 2 Fan 4 Fan 6 Fan 8

ON 1 ON 1 ON

ON 2 ON

ON 3 ON

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

ON 1 ON 1 ON

ON 2 ON

ON 3 ON

ON ON

ON 4 ON

ON 5 ON ON

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 evapora tive -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

Circuit 2

1 2

Number of fans = 8 (R410A)Number of fans = 10 (R410A)Number of fans = 12 Fan 1 Fan 3 Fan

Number of Fans = 4 Number of fans = 6 Number of fans = 8

Fan 1 Fan 3 Fan

Fan

Fan 1 Fan 3 Fan

Fan

Number of fans = 8 (R410A)Number of fans = 10 (R410A)Number of fans = 12

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.

16 WGZ030D through WGZ200D OMM 1130-2

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

OMM 1130-2 17

Keypad/Display

Description

Type

Signal Source

Range

Evaporator Refrigerant Pressure #1 (R134a,R22)

0.1 to 0.9 VDC

0 to 132 psi

(R410a)

0.1 to 0.9 VDC

0 to 350 psi

Evaporator Refrigerant Pressure #2 (R134a,R22)

0.1 to 0.9 VDC

0 to 132 psi

Evaporator Refrigerant Pressure #2 (R410a)

0.1 to 0.9 VDC

0 to 350 psi

Condenser Refrigerant Pressure #1 (R134a,R22)

0.1 to 0.9 VDC

3.6 to 410 psi

Condenser Refrigerant Pressure #1 (R410a)

0.1 to 0.9 VDC

0 to 700 psi

(10k@25°C)

Condenser Entering Water Temperature or Outside Ambient Temperature (See Note below)

(10k@25°C)

Condenser Refrigerant Pressure #2 (R134a,R22)

0.1 to 0.9 VDC

3.6 to 410 psi

Condenser Refrigerant Pressure #2 (R410a)

0.1 to 0.9 VDC

0 to 700 psi

Reset of Leaving Water Temperature

4-20 mA Current

0-(10 to 80°F)

Demand Limit (R22, R410A)

4-20 mA Current

0-100 % Load

(10k@25°C)

Air Conditi oning

ALARM

VIEW

SET

< < <

Menu Key

Key to Screen Pathway

"Enter" Key

Arrow Keys

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

our arrow keys (UP, DOWN, LEFT, RIGHT) have three modes of use.

The f 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 DOWN Decrement 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

Evaporator Refrigerant Pressure #1

Leaving Evaporator Water Temperature UT

Compressor Suction Temperature #1 C1

Compressor Suction Temperature #2 C2

NTC Thermister

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.

18 WGZ030D through WGZ200D OMM 1130-2

-58 to 212°F

Table 4, Analog Outputs

Description

Output Signal

Range

Cooling Tower Bypass Valve Position

0 to 10 VDC

0 to 100% Open

Cooling Tower VFD Speed

0 to 10 VDC

0 to 100%

Circuit #2 Electronic Expansion Valve

0 to 10 VDC

0 to 100%

Description

Type

Signal

Unit OFF Switch

0 VAC (Stop)

24 VAC (Auto)

Pump Down Switch #1

0 VAC (Stop)

24 VAC (Start)

Evaporator Water Flow Switch

0 VAC (No Flow)

24 VAC (Flow)

Open

Pump Down Switch #2

0 VAC (Stop)

24 VAC (Start)

Motor Protection #2

0 VAC (Fault)

24 VAC (No Fault)

Open

Condenser Water Flow Switch (R134a,R410a)

0 VAC (No Flow)

24 VAC (Flow)

Phase Voltage Fault #1 (See Note 1 Below)

0 VAC (Fault)

24 VAC (No Fault)

Phase Voltage Fault #2 (See Note 1 Below)

0 VAC (Fault)

24 VAC (No Fault)

Ground Fault Prot. #1 (See Note 2 Below)

0 VAC (Fault)

24 VAC (No Fault)

Ground Fault Prot. #2 (See Note 2 Below)

0 VAC (Fault)

24 VAC (No Fault)

*14

Condenser Water Flow Switch

0 VAC (No Flow)

24 VAC (Flow)

*14

(

*15

Open

*15

(R134a,R410a)

0 VAC (Fault)

24 VAC (No Fault)

*16

Open

*16

(R134a,R410a)

Ice Mode Switch

0 VAC (Normal)

24 VAC (Ice)

Heat Mode Switch

0 VAC (Normal)

24 VAC (Heat)

Description

Type

Load

Output OFF

Output ON

Alarm

C1,C2,UT

Alarm Indicator

Alarm OFF

Alarm ON

Evaporator Water Pump

Pump Contactor

Pump OFF

Pump ON

Condenser Water Pump – Water Cooled = Y

Pump Contactor

3 Circuit #1 Electroni c E xpansion V alve 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 inpu ts to this contr oll er . C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit, *n = Refrigerant Dependent

Motor Protection #1 C1 0 VAC (Fault) 24 VAC (No Fault)

Open

Remote Start/Stop UT 0 VAC (Stop) 24 VAC (Start)

Open

Motor Protection #1

Motor Protection #2

C2 0 VAC (Fault) 24 VAC (No Fault)

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

Condenser Fan #1 – Water Cooled = N /

C1 / UT

Fan Contactor/

Fan OFF Fan ON

Motor Control Relay #1 = Compr#1 C1 Starter Compressor OFF Compressor ON

Continued next page.

OMM 1130-2 19

Table 6, Continued

Description

Type

Load

Output OFF

Output ON

Motor Control Relay #3 = Compr#3

Starter

Compressor OFF

Compressor ON

#2-Water Cooled=Y

(R134a,R410a)

Liquid Line #1

Solenoid

Cooling OFF

Cooling ON

Motor Control Relay #2 = Compr#2

Starter

Compressor OFF

Compressor ON

Motor Control Relay #4 = Compr#4

Starter

Compressor OFF

Compressor ON

*11

Condenser Fan #4

Fan Contactor

Fan OFF

Fan ON

*11

(R134a,R410a)

Liquid Line #2

Solenoid

Cooling OFF

Cooling ON

Hot Gas Bypass #1

Solenoid

Cooling OFF

Cooling ON

*16

Condenser Fan #6

Fan Contactor

Fan OFF

Fan ON

*16

*17

Condenser Fan #7

Fan Contactor

Fan OFF

Fan ON

*17

(R134a,R410a)

Condenser Fan #8

Fan Contactor

Fan OFF

Fan ON

Condenser Fan #6&8

Fan Contactor

Fan OFF

Fan ON

Description

Type

Output Off

Output On

Cond Water Pump Output #2

Pump Off

Pump On

Condenser Fan #9

Fan OFF

Fan ON

Condenser Fan #10

Fan OFF

Fan ON

Description

Type

Output Off

Output On

(R134a)

(10k@25°C)

Demand Limit (R134a)

4-20 mA Current

0-100 % Load

(10k@25°C)

Condenser Fan #3– Water Cooled =N /Tower Fan

Motor Control Relay #5 = Compr#5

Condenser Fan #2 – Water Cooled =N /Tower Fan

#1-Water Cooled=Y

Motor Control Relay #6 = Compr#6

Condenser Fan #5 C1 Fan Contactor Fan OFF Fan ON

Hot Gas Bypass #2 C2 Solenoid Cooling OFF Cooling ON

Condenser Fan #4 C2 Fan Contactor Fan OFF Fan ON

Condenser Fan #5&7

C1 /

Fan Contactor Fan OFF Fan ON

C1 Starter Compressor OFF Compressor ON

C2 /

Fan Contactor Fan OFF Fan ON

C2 Starter Compressor OFF Compressor ON

C1 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

Evap Water Pump Output #2 UT Pump Off Pump 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

Entering Evaporator Water Temperature

3 Liquid Line Temperature #1 (R134a)

4 Liquid Line Temperature #2 (R134a)

NTC Thermister

10k@25°C)

(

NTC Thermister

-58 to 212°F

20 WGZ030D through WGZ200D OMM 1130-2

Setpoints

Unit Enable

Off

Off, On

Control source

Switches

Keypad, Network, Switches

Ice w/Glycol, Test

20.0 to 85.0°F (R134a)

40. 0 °F

15.0 to 40.0 °F

110.o°F

110 to 165°F

Evap Delta T

10.0 °F

6.0 to 16.0 °F

Startup Delta T

10.0 °F

1.0 to 15.0 °F

Max Pulldown Rate

1.0 °F

0.5 to 5.0 °F

Evap Recirculate Timer

15 to 300 seconds

20.0°F

5.0 to 40.0°F

(Water-cooled = Yes)

Demand Limit

Off

Off, On

* Water Cooled

Off

Off, On

Clear Ice Delay

No, Yes

Hot Gas Delay Time

30 sec.

30 to 180 seconds

BAS Protocol

Modbus

BACnet, LonWorks, Modbus

Ident number

001

000-200

Baud rate

9600

1200,2400,4800,9600,19200

Units

F/psi

F/psi (only)

Language

English

English (only)

* Refrigerant Select

None

R22, R407C, R410A, R134a

Cooling Reset Type

None

None, 4-20mA, [Return( Refrig = R134a only)]

Cooling Maximum Reset

10 ºF

0 to 16 ºF

Compressor

# of Compressors (Refrig = R410A or R134a to select 6)

Clear Cycle Tmr

Off

On/Off

Stage Down Delay

20 to 60 sec

Start-Start

15 min

10 to 60 min

Stop-Start

5 min

3 to 20 min

The following parameters are remembered during power off, are factory set to the Default value, and can be adjusted to any value in the Range column.

The PW (password) column indicates the password level that must be active in order to change the setpoint. Passwords are as follows:

O = Operator [0100] M = Manager [2001]

Table 7, Setpoints (setpoints with * are set at Daikin Applied factory)

Description Default Range PW

*Unit Mode (R22, R407C, R410A Cool Cool, Cool w/Glycol, Ice w/Glycol, Test O Unit Mode (R134a) Cool Cool, Cool w/Glycol, Heat, Test

*Available Modes (R22,R407C,R410A) Cool *Available Modes (R134a) Cool

Evap LWT

Ice LWT Heat LWT (R134a only)

Stop Delta T

Evap Pump (Refrigerant = R410a,R134a) Cond Delta T (R134a only) Cond Pump Recirculate Timer

Cond Pump (Water-cooled=Yes & Ref=R410A or R134a

Low Ambient Lockout(Water-Cooled = No)

44. 0 °F

0.5 °F 0 to 3.0 °F

#1 Only

30 15 to 90 seconds M

#1 Only #1 Only, #2 Only, Auto, #1 Prim, #2 Prim M

35.0 °F

Cool, Cool w/Glycol, Cool/Ice w/Glycol

Test, Cool, Cool w/Glycol, Cool/Heat, COOL/HEAT

w/Glycol, Heat w/Glycol,

Without Glycol: 40.0 to 60.0°F

40.0 to 85.0°F (R134a Only)

With Glycol: 20.0 to 60.0°F (R22,R407C)

10.0 to 60.0°F (R410A)

#1 Only, #2 Only, Auto, #1 Prim,

#2 Prim

35 to 70 °F

If Speedtrol = Yes

-2.0 to70.0°F (R22,R407C)

-10.0 to 70.0 (R410A) N/A (R134a)

M M

O O

Ice Time Delay 12 hrs 1 to 23 hrs M

Cooling Start Reset Delta T 10 ºF 0 to 16 ºF (Refrig = R134a only) O

Stage Up Delay 240 sec 90 to 480 seconds M

OMM 1130-2 21

4 4, 6 M

Table 7

Expansion Valve Type

Electronic

Thermal, Electronic

Circuit 1 EXV Control

Auto

Auto, Manual

Circuit 1 EXV Position

N/A

0-100%

Circuit 2 EXV Position

N/A

0-100%

MaxOpPress

156

142 – 170 psig

SuperheatTarg

8-12°F

Alarms

Low Evap Pressure-Hold

Water: 405 psig

Water: 355 – 425 psig

37.0 to 42.0 °F

7.5 to 42.0°F (R410A)

Cond. Freeze

34.0 °F

18 to 42 °F

High Condenser Pressure Stop (Water-Cooled = Y

280 psi 420 psi

260 to 380 psi (R22, R407C)

375 TO 435 psi (R410A)

High Condenser Pressure Stop (Water Cooled = N)

380 psi 565 psi

260 to 380 psi (R22, R407C)

425 to 570 psi (R410A)

High Condenser Pressure Stop (R134a)

185 psi

170 to 425 psi

Evap Flow Proof

5 sec.

5 to 15 seconds

Cond Flow Proof

5 sec.

5 to 15 seconds

Recirc Timeout

3 min.

1 to 10 minutes

* Ground Fault ProtectionN N,Y

Low OAT Start Time

60 sec.

30 to 240 seconds

Condenser Fans (Water Cooled = N)

Number of fans 4 4 to 8 (10 for R410a)

Speedtrol Option

No,Yes

Stg on Deadband Stg 2

15 °F

15 to 25°F

Stg on Deadband Stg 3

10°F

10 to 15°F

Stg on Deadband Stg 4

10°F

10 to 15°F

Stg Off Deadband Stg 1

20°F

15 to 20°F

Stg Off Deadband Stg 2

15°F

10 to 15°F

Stg Off Deadband Stg 3

10°F

6 to 10°F

Stg Off Deadband Stg 4

10°F

6 to 10°F

Forced Fan 3 (>105°F)

Cooling Tower (Water Cooled = Y)

Tower Control

None

None, Temperature

Tower Stages 2 0 to 2

Stage Up Time

2 min

1 to 60 min

Stage Down Time

5 min

1 to 60 min

Stage Differential

3.0 °F

1.0 to 10.0 °F

Stage #1 On

70 °F

40 to 120 °F

Stage #2 On

75 °F

40 to 120 °F

None, Valve Set point, Valve Stage, VFD

65 °F

60 to 120 °F

Valve Deadband

2.0 °F

1.0 to 10.0 °F

Stage Fan Down @

20%

0 to 100%

Valve Control Range (Min)

10%

0 to 100%

Valve Control Range(Max)

90%

0 to 100%

Valve Type

NC to tower

NC, NO

Minimum Start Position

0 to 100%

Minimum Position @

60 °F

0 to 100 °F

Maximum Start Position

100%

0 to 100%

Error Gain

10 to 99

Slope Gain

10 to 99

Circuit 2 EXV Control Auto Auto, Manual M

, Continued

Description Default Range PW

Low Evap Pressure-Unload M High Cond Pressure – Unload

High Cond Pressure – Stop

Evap. Freeze

* Phase Voltage Protection N N,Y M

See following section; Automatic Adjusted Limits

Air: 550 psig

Water: 420 psig

Air: 565 psig

38.0 °F

Glycol: 17.5 to 42.0°F (R134a,R22, R407C)

Air: 410- - 555 psig

Water: 375 – 435 psig

Air: 425 – 570 psig

M M

Cond Sat Temp Target 100°F 80 to 120°F M Forced Fan 1 (>75°F) Forced Fan 2 (>90°F)

Valve/VFD Control None Valve Setpoint

Stage Fan Up @ 80% 0 to 100% M

Maximum Position @

22 WGZ030D through WGZ200D OMM 1130-2

Stage, Valve SP/VFD Stage

90 °F 0 to 100 °F

M M

Automatic Adjusted Limits

Mode

Refrigerant Type

Range

Unit Mode = Cool

R134a, R410A

40 to 60°F

Unit Mode = Cool w/Glycol

R134a

20 to 60°F

Unit Mode = Cool w/Glycol

R410a

15 to 60°F

Unit Mode = Ice

R410A

20 to 40°F

Mode

Refrigerant Type

Range

Unit Mode= HEAT

R134a

110 to 160ºF

Mode

Refrigerant Type

Range

Unit Mode = Cool

R134a, R410A

36 to 42°F

Unit Mode = Cool w/Glycol, Ice w/Glycol

Refrigerant Type

Range

R134a

N/A

R22, R407C

20 to 40°F

R410A

15 to 40°F

Mode

Refrigerant Type

Range

R410A

97 to 115 psi

w/Glycol

R410A

48 to 115 psi

Speedtrol

Range

Speedtrol = N

35 – 70°F

The following are set points that will be limited based on the option selected.

Evaporator Leaving W ate r Temperature

Conde

Evapor

Ice Lea

Low

nser Leaving Water Temperature

ator Freeze Temperature

R134a 18 to 42°F R410A 12.5 to 42°F

ving W ater Temperature

Evaporator Pressure Inhibit Loading and Unloading

Unit Mode = Cool Unit Mode = Cool w/Glycol, Ice

R134a

26 to 54 psi

12 to 54 psi

Ambient Lockout T empe rature

Low

Speedtrol = Y -2 – 70°F

NOTE:

The backup mechanical high pressure cutout is set at 450 psi for water cooled applications and

600 psi for air cooled for air-cooled applications.

OMM 1130-2 23

Dynamic Defaults

R134a

R410A

Low Evaporator Pressure Hold

29 psi

101 psi

405 psi WC

Some set points will have a particular default value loaded when another setting is changed.

Refrigerant Dependent Defaults

Set Point

Low Evaporator Pressure Unload High Condenser Pressure Unload 170 psi

High Condenser Pressure 185 psi

Refrigerant Type

28 psi

550 psi AC

565 psi AC 420 psi WC

100 psi

AC = Air Cooled, WC = Water Cooled (R134a is water cooled ONLY)

Number of Fans Dependent Defaults

When the number of fans setting is changed, the forced fan set points will default to values as shown in the following table:

Set Point

Forced Fan 1 (>75°F) 1 1 1 1 Forced Fan 2 (>90°F) 1 1 2 2 Forced Fan 3 (>105°F) 2 2 3 3

4 6 8 10

Number of Fans Set Point

Events & Alarms

Situations may arise that require some action from the chiller or that should be logged for future reference. Conditions that cause a shutdown and require manual reset is known as a stop alarm. Other conditions can trigger what is known as an event, which may or may not require action in response. All stop alarms and events are logged.

Unit Stop Alarms

The alarm output and red button is turned ON when any stop alarm occurs and turned off when all alarms have been cleared.

Evaporator Flow Loss

Alarm description (as shown on screen): Evapo rator Flow Loss Trigger:

1: Evaporator Pump State = Run AND Evaporator Flow Digital Input = No Flow for time > Evap Flow

Proof Set Point AND at least one compressor running.

2: Evaporator Pump State = Start for time greater than Recirc Timeout Set Point AND all pumps have

been tried AND Evaporator Flow Digital Input = No Flow.

Action T aken: R apid sto p all circu it s. Reset:

This alarm can be cleared at any time manually via the keypad or via the BAS clear alarm signal.

If active via trigger condition 1:

24 WGZ030D through WGZ200D OMM 1130-2

When the alarm occurs due to this trigger, it can auto reset the first two times each day, with the third occurrence being manual reset.

the auto-reset occurrences, the alarm will reset automatically when the evaporator state is Run again.

For This means the alarm stays active while the unit waits for flow, then it goes through the recirculation process after flow is detected. Once the recirc ula tion is complete, the evaporator goes to the Run state which will clear the alarm. After three occurrences, the count of occurrences is reset and the cycle starts over if the manual reset flow loss alarm is cleared.

If a

ctive via trigger condition 2:

If the flow loss alarm has occurred due to this trigger, it is always a manual reset alarm.

Condenser Flow Loss (Note: WaterCooled = On & TGZ units Only)

Alarm description (as shown on screen): Conden ser Flow Loss Trigger:

1: Condenser Pump State = Run AND Condenser Flow Digital Input = No Flow for time > Cond Flow

Proof Set Point AND at least one compressor running.

2: Condenser Pump State = Start for time greater than Recirc Timeout Set Point AND all pumps have

been tried AND Condenser Flow Digital Input = No Flow.

Action T aken: R apid sto p all circu it s. Reset:

This alarm can be cleared at anytime manually via the keypad or via the BAS clear alarm signal.

If a

ctive via trigger condition 1: When the alarm occurs due to this trigger, it can auto reset the first two times each day, with the third occurrence being manual reset.

For

the auto-reset occurrences, the alarm will reset automatically when the condenser pump state is Run again. This means the alarm stays active while the unit waits for flow, then it goes through the recirculation process after flow is detected. Once the recirculation is complete, the condenser pump goes to the Run state which will clear the alarm. After three occurrences, the count of occurrences is reset and the cycle starts over if the manual reset flow loss alarm is cleared.

If active via trigger condition 2: If the flow loss alarm has occurred due to this trigger, it is always a manual reset alarm.

Low Evaporator Pressure

Alarm description (as shown on screen): Evap Press Low Cir N Trigger: [Circuit State = Run AND Freezestat trip AND Low OAT Start not active]

OR Evaporator Press < Absolute Low Pressure Limit AND Circuit State = Run

The a

bsolute low pressure limit is 5 psi with R134a, R22, and R407C refrigerants and 20 psi with R410A

refrigerant.

Freezestat logic allows the circuit to run for varying times at low pressures. The lower the pressure, the shorter the time the compressor can run. This time is calculated as follows:

Freeze error = Low Evaporator Pressure Unload – Evaporator Pressure Freeze time =

[60 – 2.7 x freeze error] with R134a refrigerant, limited to a range of 20-60 seconds [60 – 1.6 x freeze error] with R22 and R407C refrigerant, limited to a range of 20-60 seconds [60 – freeze error] with R410A refrigerant, limited to a range of 20-60 seconds

OMM 1130-2 25

When the evaporator pressure goes below the Low Evaporator Pressure Unload set point, a timer starts. If this timer exceeds the freeze time, then a ‘Evap Press Low Cir N’ alarm trip occurs. If the evaporator pressure rises to the unload set point or higher, and the freeze time has not been exceeded, the timer will reset.

Action T aken: Rapid stop circuit Reset: This alarm can be cleared manually via the keypad if the evaporator pressure is above the absolute

low-pressure limit.

High Condenser Pressure

Alarm description (as shown on screen): Cond Press High Cir N Trigger: Condenser Pressure > High Condenser Pressure Set Point Action T aken: R apid stop circuit Reset: This alarm can be cleared manually via the keypad.

Mechanical High Pressure/Motor Protect

Alarm description (as shown on screen): MHP or Motor Prot N Trigger: MHP/MP input is low and over 150 seconds lapsed since controller boot-up Action T aken: R apid stop circuit Reset: This alarm can be cleared manually via the keypad if the MHP/MP input is high.

Phase Voltage Protection

Alarm description (as shown on screen): Phase/Voltage Cir N Trigger: PVM input is low and Phase Voltage set point = enable. Action T aken: R apid stop circuit Reset: Auto reset when PVM input is high

Ground Fault Protection

Alarm description (as shown on screen): Ground Fault Cir N Trigger: GFP input is low and Ground Fault set point = enable. Action T aken: R apid stop circuit Reset: This alarm can be cleared manually via the keypad.

Low OAT Restart Fault

Alarm description (as shown on screen): Low OAT Start Fail N Trigger: Circuit has failed three low OAT start attempts Action T aken: R apid stop circuit Reset: This alarm can be cleared manually via the keypad.

Evaporator Water Freeze Protect

Alarm description (as shown on screen): Evap Water Freeze Trigger: Evaporator LWT drops below evaporator freeze protect set point AND Unit State = Auto Action T aken: R apid sto p all circu it s Reset: This alarm can be cleared manually via the keypad or via the BAS clear alarm signal, but only if

the alarm trigger conditions no longer exist.

Leaving Evaporator Water Temperature Sensor Fault

Alarm description (as shown on screen): Evap LWT Sens Fault Trigger: Sensor shorted or open Action T aken: Normal stop all circuits Reset: This alarm can be cleared manually via the keypad, but only if the sensor is back in range.

Leaving Condenser Water Temperature Sensor Fault

Alarm description (as shown on screen): CondLWT Sens Fault Trigger: Sensor shorted or open AND TGZ unit (refrig = R134a) AND operating in ‘heat’ mode.

26 WGZ030D through WGZ200D OMM 1130-2

Action T aken: Normal stop all circuits Reset: This alarm can be cleared manually via the keypad, but only if the sensor is back in range.

Suction Temperature Sensor Fault

Alarm description (as shown on screen): SuctT Sensor Fail N Trigger: Sensor shorted or open AND Expansion Valve Type = Electronic Action T aken: R apid stop circuit Reset: This alarm can be cleared manually via the keypad, but only if the sensor is back in range.

Evaporator Pressure Sensor Fault

Alarm description (as shown on screen): EvapP Sensor Fail N Trigger: Sensor shorted or open. If failing high (open), logic has been added that requires the Leaving

Evaporator Temperature to be below 75°F. This will prevent nuisance trips due to conditions where the evaporator water temperature is high which could cause false alarms.

Action Taken: Rapid stop circuit Reset: This alarm can be cleared manually via the keypad, but only if the sensor is back in range.

Condenser Pressure Sensor Fault

Alarm description (as shown on screen): CondP Sensor Fail N Trigger: Sensor shorted or open Action Taken: Rapid stop circuit Reset: This alarm can be cleared manually via the keypad, but only if the sensor is back in range.

Condenser Entering or Outdoor Air Temperature Sensor Fault

Alarm description (as shown on screen): OAT Sensor Fault Trigger: Sensor shorted or open Action T aken: Normal stop all circuits Reset: This alarm can be cleared manually via the keypad, but only if the sensor is back in range

Evaporator Water Freeze Protect

the alarm trigger conditions no longer exist.

No Pressure Change at Start

Alarm description (as shown on screen): NoPressChgAtStartN Trigger: Circuit has failed twice on a No Pressure Change at Start Condition. A No Pressure Change at

Start Conditio n in d icates that after the start of the first compressor on the circuit, at least a 1 psi drop in evaporator pressure OR a 1 psi increase in condenser pressure has not occurred after 15 seconds of compressor operation.

Action T aken: R apid stop circuit Reset: This alarm can be cleared manually via the keypad.

EXB Comm Failure on CP1

Alarm description (as shown on screen): No EXB comm CP1 Trigger: CP1 does not have communication with either EXB1 for 60 seconds after power up. This alarm

will only occur if 10 Fan , evaporator pump #2, or condenser pump #2 operation is selected. After communication is established, when communication is lost to either EXB an immediate shutdown occurs.

Action T aken: R apid sto p all circu it s Reset: Auto clear when EXB1 is communicating with CP1.

OMM 1130-2 27

+ 61 hidden pages

Daikin WGZ045DW, WGZ035DW, WGZ050DW, WGZ055DW, WGZ060DW Operating And Maintenance Manual

Specifications and Main Features

Frequently Asked Questions

User Manual