User Manual
Table Of Contents
- Warranty and Return Policy
- RECEIVING THE AIR CONDITIONER
- HANDLING AND TESTING THE AIR CONDITIONER
- HOW TO READ MODEL NUMBERS
- TECHNICAL INFORMATION
- Sequence of Operation
- Heating
- Cooling
- Thermostat
- Remote Access Control (optional)
- Head Pressure Control
- Contactor (115V 12000 BTU/Hr. Units only)
- Contactor (460V Units only)
- Overload (460V Units only)
- Phase Monitor
- 460V to 230V Transformer
- 115V to 10V or 230V to 10V Transformer (optional)
- 115V to 24V or 230V to 24V Transformer and Relay (optional)
- G521216GXXX Generic Schematic (actual unit options may vary)
- G52 All Other Generic 1-Phase Schematic (actual unit options may vary)
- G52 Generic 3-Phase Schematic (actual unit options may vary)
- G521216GXXX Generic Wire Diagram (actual unit options may vary)
- G52 All Other Generic 1-Phase Wire Diagram (actual unit options may vary)
- G52 Generic 3-Phase Wire Diagram (actual unit options may vary)
- INSTALLATION INSTRUCTIONS
- DIMENSIONAL DRAWINGS
- REMOTE ACCESS CONTROL (optional)
- OPERATING PARAMETERS
- ALARM PARAMETERS
- Remote Access Control Pin-out
- Schematic and Wiring Diagram for Remote Access Control
- G52 1-Phase Generic Schematic (actual unit options may vary)
- G52 Generic 3-Phase Schematic (actual unit options may vary)
- G52 Generic Wire Diagram for Remote Access Control (actual unit options may vary)
- G52 Generic 3-Phase Wire Diagram for Remote Access Control (actual unit options may vary)
- DIMENSIONAL DRAWINGS
- INSTALLATION INSTRUCTIONS WITH REMOTE ACCESS CONTROL
- MAINTENANCE
- Refrigerant Properties Chart (R 134a)
- Functional Data
- 8000 BTU/Hr. Unit Characteristics
- 12000 BTU/Hr. Unit Characteristics
- SERVICE DATA
- Components List
- TROUBLE SHOOTING
© 2018 nVent
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TROUBLE SHOOTING
BASIC AIR CONDITIONING TROUBLE SHOOTING CHECK LIST - THERMOSTAT
VERSION
1. Check manufacturer’s nameplate located on the unit for correct power supply.
2. Turn on power to the unit. The evaporator (Enclosure or “COLD” air) impeller should come on. Is
there airow?
YES, proceed to step 3.
NO, possible problem:
» Open motor winding
» Stuck impeller motor
» Obstructed wheel
Repair or Replace
defective part
3. Check phase monitor indicator light, is it Illuminated?
YES, proceed to step 4.
NO, possible problem:
» Incorrect electrical phasing
De-energize unit and swap
any two power leads
to unit. If problem still
persists, replace phase
monitor. Refer to phase
monitor section of this
manual for additional
information.
4. Check thermostat setting and adjust thermostat to the lowest setting. This should turn the
condenser impellers and the compressor on. Did condenser impellers and compressor come on
when the thermostat was turned on?
YES, proceed to step 5.
NO, possible problem:
» Tripped customer door switch
» Defective thermostat
Replace part
5. Are all impellers and the compressor running? If not the unit will not cool properly.
6. Check condenser (Ambient or “HOT” air) impellers for airow. Is there airow?
YES, proceed to step 7.
NO, possible problem:
» Defective thermostat
» Open motor winding
» Stuck impeller motor
» Obstructed wheel
Repair or Replace
defective part
7. Carefully check the compressor for operation - motor should cause slight vibration, and the outer
case of the compressor should be warm. Is the compressor showing signs of this?
YES, wait 5 minutes, then proceed to step 8.
NO, possible problem:
» Defective thermostat
» Defective overload
» Defective relay
Repair or Replace
defective part