nvent SPECTRACOOL G28 Series Instruction Manual
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nvent SPECTRACOOL G28 Series Instruction Manual

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SPECTRACOOL
Air Conditioner
G28 Model
INSTRUCTION MANUAL
Rev. A
© 2022 nVent
89209667
P/N 89209667

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Summary of Contents for nvent SPECTRACOOL G28 Series

  • Page 1 SPECTRACOOL Air Conditioner G28 Model INSTRUCTION MANUAL Rev. A © 2022 nVent 89209667 P/N 89209667...

  • Page 2: Table Of Contents

    Symptoms and Possible Causes - Thermostat Version ............................... 40 Basic Air Conditioning Trouble Shooting Check List - Remote Access Control Version ....................41 Symptoms and Possible Causes - Remote Access Control Version ........................... 43 F-GAS INFORMATION ......................................43 © 2022 nVent 89209667 - 2 -...

  • Page 3: Warranty And Return Policy

    Damage evident upon receipt should be noted on the freight bill. Damage should be brought to the attention of the delivering carrier -- NOT to nVent Equipment Protection -- within 15 days of delivery. Save the carton and packing material and request an inspection. Then file a claim with the delivering carrier.

  • Page 4: Technical Information

    118 F (165 psig), the condenser fans will power on. CONTACTOR (460V UNITS ONLY) The contactor on this model uses a 230V coil. OVERLOAD (460V UNITS ONLY) Set overload reset setting to automatic “A” and trip point dial to 1.6A. © 2022 nVent 89209667 - 4 -...

  • Page 5: Phase Monitor

    SCHEMATICS AND WIRING DIAGRAMS FOR THERMOSTAT CONTROL 4000 BTU 1-PHASE SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY) © 2022 nVent 89209667 - 5 -...

  • Page 6: 6000 Btu 1-Phase Schematic (Actual Unit Options May Vary)

    6000 BTU 1-PHASE SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY) G28 GENERIC 3-PHASE SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY) © 2022 nVent 89209667 - 6 -...

  • Page 7: 4000 Btu 1-Phase Wire Diagram (Actual Unit Options May Vary)

    4000 BTU 1-PHASE WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY) 89077284 © 2022 nVent 89209667 - 7 -...

  • Page 8: 6000 Btu 1-Phase Wire Diagram (Actual Unit Options May Vary)

    6000 BTU 1-PHASE WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY) 89081439 © 2022 nVent 89209667 - 8 -...

  • Page 9: G28 Generic 3-Phase Wire Diagram (Actual Unit Options May Vary)

    G28 GENERIC 3-PHASE WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY) © 2022 nVent 89209667 - 9 -...

  • Page 10: Dimensional Drawings

    DIMENSIONAL DRAWINGS 4000 BTU 115V WITH THERMOSTATS © 2022 nVent 89209667 - 10 -...

  • Page 11: 6000 And 4000 Btu 230V With Thermostats

    1/4-20 UNC (11) 31.9 ALUMINUM INLET FILTER 355.6 MOUNTING HOLES 89059479 BEHIND REMOVABLE PANEL. 15.26 387.6 NOTE: APPROVE TO TYPE 3R/4/12. MOUNTING GASKET SUPPLIED (NOT SHOWN). ACCESS HOLE TO .375 [9.5] O.D. DRAIN STUB © 2022 nVent 89209667 - 11 -...

  • Page 12: Installation Instructions

    24 VAC terminal strip by noting the locations on the correct wiring diagram. 8. Set thermostat for required cabinet temperature. Refer to Sequence of Operation on page 4 for thermostat adjustment and operation. 89059115 28100013 Surface Mount Partial Recess Mount Figure 1 Cut-out Drawing © 2022 nVent 89209667 - 12 -...

  • Page 13: Digital Thermostat Controller (Optional)

    Note: nVent Hoffman network card (RAC module) is an optional accessory, therefore, some of the air conditioners ship without the network card but it is upgradable upon request.
  • Page 14 Compressor Running • Steady ON while compressor is running White Evaporator Running White Electric heater ON White Primary and/or lead controller Compressor and Condenser fan OFF White Freeze control while illuminated White Power ON © 2022 nVent 89209667 - 14 -...
  • Page 15 © 2022 nVent 89209667 - 15 -...

  • Page 16: Displaying And Changing Program Settings

    Default value High temperature alarm setpoint 125 F Low temperature alarm setpoint 40 F Door open alarm setting ArOP Alarm relay output NOTES: (4) The alarm relay output logic is designed to be configurable © 2022 nVent 89209667 - 16 -...
  • Page 17 No effect on function setpoint Compressor and condenser fan turns OFF for the duration Frost alarm Evaporator coil freezes of alarm. Alarm clears when Closed the outlet temperature sensor reaches 59 F © 2022 nVent 89209667 - 17 -...

  • Page 18: Displaying Temperature Data On Screen

    This input is associated with the controller display alarm mnemonic dO (door open). To use this feature, remove the splice connector, and connect the two white wires to customer supplied enclosure door switch in its place. Note: do NOT apply power to this dry contact input. © 2022 nVent 89209667 - 18 -...

  • Page 19: Primary-Secondary (Ps) Mode

    7. Best recommendation is to configure the ACU that has Hoffman network card to be the primary one. CONNECTING UNITS TOGETHER IN PRIMARY/SECONDARY MODE Primary - Device ID 1 Secondary - Device ID 2 Secondary - Device ID 3 Secondary - Device ID 10 Figure 3 Primary-secondary network connectivity © 2022 nVent 89209667 - 19 -...

  • Page 20: Connecting Units Together In Lead/Lag Mode

    10. Set parameter H03 (total number of controllers connected) to 1 to 10. CONNECTING UNITS TOGETHER IN LEAD/LAG MODE Lead - Device ID 1 Lag - Device ID 2 Figure 4 Lead-Lag network connectivity © 2022 nVent 89209667 - 20 -...

  • Page 21: Air Conditioner Unit Remote Communication Features

    Air conditioners that include the optional Hoffman network card (RAC module) have remote communication capabilities utilizing SNMP, Modbus TCP, EtherNet/IP, Profinet Protocol via Ethernet connection, and Modbus RTU protocol via USB connection. nVent provides Windows interface application software that is available to download free from nVent support link https://go.nvent.com/remote-access-control-support-center. The Windows interface application software supports both Ethernet and USB communication.

  • Page 22: Using Hoffman Pc Interface Tool

    Enter the new network configuration to Device IP address, Gateway IP, and Trap IP, then click on Reprogram ACU • button to write to the network card. In order to be recognized the new networking configurations in local network, cycle power to the A/C unit is required. • © 2022 nVent 89209667 - 22 -...

  • Page 23: Usb Communication Mode

    Enter the new network configuration to Device IP address, Gateway IP, and Trap IP, then click on Reprogram ACU • button to write to the network card. In order to be recognized the new networking configurations in local network, cycle power to the A/C unit is required. • © 2022 nVent 89209667 - 23 -...

  • Page 24: Ethernet Communication Mode

    Refer to remote access control (RAC) Instruction Manual for configuring multiple units and with text message and email capability in Hoffman A.C. Monitor software. The remote access control Instruction Manual, P/N: 89091002 can be downloaded from nVent support center link, https://go.nvent.com/remote-access-control-support-center.

  • Page 25: Remote Access Control Pin-Out

    INLET TEMP PROBE DOOR OPEN SWITCH WHT63 GROUND RESERVED OUTLET TEMP PROBE RED45 MAL-FUNCTION ALARM BLU88 RESERVED UNIT REMOTE ON/OFF RESERVED RESERVED GROUND RESERVED DATA (-) DATA (+) GROUND DATA (-) DATA (+) GROUND © 2022 nVent 89209667 - 25 -...

  • Page 26: Schematics And Wiring Diagrams For Remote Access Control

    SCHEMATICS AND WIRING DIAGRAMS FOR REMOTE ACCESS CONTROL 4000 BTU 115V 1-PHASE SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY) 89204550 REV. A 4000 BTU 230V AND 6000 BTU 115V/230V 1-PHASE SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY) 89204317 REV. C © 2022 nVent 89209667 - 26 -...

  • Page 27: G28 Generic 3-Phase Schematic (Actual Unit Options May Vary)

    G28 GENERIC 3-PHASE SCHEMATIC (ACTUAL UNIT OPTIONS MAY VARY) 89204833 REV. A © 2022 nVent 89209667 - 27 -...

  • Page 28: 4000 Btu 115V 1-Phase Wire Diagram For Remote Access Control (Actual Unit Options May Vary)

    4000 BTU 115V 1-PHASE WIRE DIAGRAM FOR REMOTE ACCESS CONTROL (ACTUAL UNIT OPTIONS MAY VARY) 89204539 REV. B © 2022 nVent 89209667 - 28 -...

  • Page 29: 4000 Btu 230V And 6000 Btu 115V/230V 1-Phase Wire Diagram For Remote Access Control (Actual Unit Options May Vary)

    4000 BTU 230V AND 6000 BTU 115V/230V 1-PHASE WIRE DIAGRAM FOR REMOTE ACCESS CONTROL (ACTUAL UNIT OPTIONS MAY VARY) 89204202 REV. C © 2022 nVent 89209667 - 29 -...

  • Page 30: G28 Generic 3-Phase Wire Diagram For Remote Access Control (Actual Unit Options May Vary)

    G28 GENERIC 3-PHASE WIRE DIAGRAM FOR REMOTE ACCESS CONTROL (ACTUAL UNIT OPTIONS MAY VARY) 89204830 REV. B © 2022 nVent 89209667 - 30 -...

  • Page 31: Dimensional Drawings

    DIMENSIONAL DRAWINGS 4000 BTU 115V WITH REMOTE ACCESS CONTROL 4000 AND 6000 BTU 230V WITH REMOTE ACCESS CONTROL © 2022 nVent 89209667 - 31 -...

  • Page 32: Installation Instructions With Remote Access Control

    Electrical circuit should be fused with slow blow or HACR circuit breaker. 6. Set controller setpoints for required cabinet temperature. Refer to DISPLAYING AND CHANGING PROGRAM Settings on page 16 for setpoint adjustment and operation. 28100013 Figure 5 Cut-out Drawing © 2022 nVent 89209667 - 32 -...

  • Page 33: Maintenance

    1. Flush the filter with warm water from the exhaust side to the intake side. DO NOT USE CAUSTICS. 2. After flushing, allow filter to drain. Placing it with a corner down will assure complete drainage. © 2022 nVent 89209667...

  • Page 34: Condenser And Evaporator Air Movers

    CAUTION Operation of the air conditioner in areas containing airborne caustics or chemicals can rapidly deteriorate filters, condenser coils, blowers and motors, etc. Contact nVent Equipment Protection for special recommendations. REFRIGERANT LOSS Each air conditioner is thoroughly tested prior to leaving the factory to insure against refrigeration leaks. Shipping damage or microscopic leaks not found with sensitive electronic refrigerant leak detection equipment during manufacture may require repair or recharging of the system.

  • Page 35: Refrigerant Properties Chart (R407C)

    -9.7 21.1 71.5 -31.7 -6.8 23.9 -28.9 26.7 86.7 -26.1 29.4 -23.3 32.2 -20.6 113.3 -17.8 37.8 40.6 -12.2 43.3 146.7 -9.4 46.1 157.5 -6.7 18.5 48.9 -3.9 51.7 -1.1 45.5 12.8 51.5 © 2022 nVent 89209667 - 35 -...

  • Page 36: Functional Data

    65-80 0.8 - 1.5 23 - 43 91 - 161 19 - 29 17 - 27 G280(4/6)46GXXX 80-100 1.1 - 1.7 33 - 60 131 - 227 23 - 33 21 - 31 © 2022 nVent 89209667 - 36 -...

  • Page 37: 4000/6000 Btu Unit Characteristics

    +/- 10% of rated Cooling Amps at Max 10.4/10.1 4.6/5.8 9.9/11.4 4.6/5.8 1.7/1.9 1.7/1.9 Conditions Heating Amps 16.3 18.2 Compressor RLA / 7.75 / 42 2.6/17.7 5.4/36.2 2.6/17.7 1.7/7.7 Evaporator Fan RLA* Condenser Fan RLA* © 2022 nVent 89209667 - 37 -...

  • Page 38: Service Data

    10-1042-06 10-1042-13 Thermal Expansion Valve 10-1040-42 10-1040-42 89057143 89057143 89057143 Thermal Overload, 10-1007-77 10-1007-77 89114723 MRA5742-114 10-1007-18 MRA5742-114 Compressor Thermostat SPDT, 55-100F 10-1061-16 10-1061-16 10-1061-16 10-1061-16 10-1061-16 10-1061-16 Transformer 460/230V 800VA 10-1006-128 10-1006-128 © 2022 nVent 89209667 - 38 -...

  • Page 39: Trouble Shooting

    Is the compressor showing signs of this? YES, wait 5 minutes, then proceed to step 8. NO, possible problem: » Defective thermostat Repair or Replace » Defective overload defective part » Defective relay © 2022 nVent 89209667 - 39 -...

  • Page 40: Symptoms And Possible Causes - Thermostat Version

    Unit blows breakers Short in system Drain plugged Drain tube kinked Getting water in enclosure Enclosure not sealed (allowing humidity in) Mounting gasket damaged For additional technical support, contact nVent Equipment Protection at 800-896-2665. © 2022 nVent 89209667 - 40 -...

  • Page 41: Basic Air Conditioning Trouble Shooting Check List - Remote Access Control Version

    Restart Time Delay mode. Within 6 minutes, symbol 1 should display without flashing. Is symbol 1 displayed without flashing? YES, proceed to step 7. NO, possible problem: » Unit still in Recycle Time Delay mode » Enclosure temperature below cooling Wait and/or heat enclosure thermistor T1 setpoint temperature © 2022 nVent 89209667 - 41 -...
  • Page 42 9. Make sure the coils are clean then check the evaporator “air in” and “air out” temperatures. If the temperatures are the same: » Possible loss of refrigerant Repair or Replace defective part » Possible bad valves in compressor © 2022 nVent 89209667 - 42 -...

  • Page 43: Symptoms And Possible Causes - Remote Access Control Version

    Unit blows breakers Short in system Drain plugged Drain tube kinked Getting water in enclosure Enclosure not sealed (allowing humidity in) Mounting gasket damaged For additional technical support, contact nVent Equipment Protection at 800-896-2665. F-GAS INFORMATION G280426GXXX G280416GXXX G280446GXXX G280616GXXX G280455GXXX...
  • Page 44 Rev. A © 2022 nVent 89209667 P/N 89209667...

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