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
89101404
- 2 -
NOTE: Some of the information in this manual may not apply if a special unit was ordered. If
additional drawings for a special unit are necessary, they have been inserted. Contact nVent
Equipment Protection if further information is required.
WARRANTY AND RETURN POLICY
https://hoffman.nvent.com/en/hoffman/warranty-information
TABLE OF CONTENTS
Warranty and Return Policy ...................................................................................................................................................................................2
RECEIVING THE AIR CONDITIONER .....................................................................................................................................................................3
HANDLING AND TESTING THE AIR CONDITIONER ............................................................................................................................................3
HOW TO READ MODEL NUMBERS........................................................................................................................................................................3
TECHNICAL INFORMATION ..................................................................................................................................................................................4
Sequence of Operation ..............................................................................................................................................................................................................4
Heating ...............................................................................................................................................................................................................................4
Cooling ...............................................................................................................................................................................................................................4
Standard and Optional Component Operation ........................................................................................................................................................................4
Thermostat ........................................................................................................................................................................................................................4
Remote Access Control (optional) ..................................................................................................................................................................................4
Head Pressure Control ......................................................................................................................................................................................................4
Contactor (115V 12000 BTU/Hr. Units only) ...................................................................................................................................................................4
Contactor (460V Units only) .............................................................................................................................................................................................4
Overload (460V Units only) ............................................................................................................................................................................................... 4
Phase Monitor ...................................................................................................................................................................................................................5
460V to 230V Transformer ...............................................................................................................................................................................................5
115V to 10V or 230V to 10V Transformer (optional) .....................................................................................................................................................5
115V to 24V or 230V to 24V Transformer and Relay (optional) ....................................................................................................................................5
Schematics and Wiring Diagrams for Thermostat Control ....................................................................................................................................................5
G521216GXXX Generic Schematic (actual unit options may vary) .............................................................................................................................. 5
G52 All Other Generic 1-Phase Schematic (actual unit options may vary) ..................................................................................................................6
G52 Generic 3-Phase Schematic (actual unit options may vary) ..................................................................................................................................6
G521216GXXX Generic Wire Diagram (actual unit options may vary) ......................................................................................................................... 7
G52 All Other Generic 1-Phase Wire Diagram (actual unit options may vary) ............................................................................................................. 8
G52 Generic 3-Phase Wire Diagram (actual unit options may vary) .............................................................................................................................9
INSTALLATION INSTRUCTIONS ..........................................................................................................................................................................10
DIMENSIONAL DRAWINGS ..................................................................................................................................................................................10
8000 BTU/Hr. With Thermostats ............................................................................................................................................................................................10
12000 BTU/Hr. With Thermostats ..........................................................................................................................................................................................11
8000-12000 BTU/Hr. (G520846G05X, G521246G05X) With Thermostats .........................................................................................................................11
8000 BTU/Hr. (G520846G15X) With Thermostats ................................................................................................................................................................12
12000 BTU/Hr. (G521246G15X) With Thermostats..............................................................................................................................................................12
REMOTE ACCESS CONTROL (optional) .............................................................................................................................................................14
INTRODUCTION ........................................................................................................................................................................................................................14
ENERGIZING THE CONTROLLER ............................................................................................................................................................................................14
CONTROL STATUS INDICATION .............................................................................................................................................................................................14
DISPLAYING AND CHANGING PROGRAM VARIABLES ........................................................................................................................................................15
OPERATING PARAMETERS .....................................................................................................................................................................................................15
ALARM PARAMETERS .............................................................................................................................................................................................................15
DISPLAYING TEMPERATURE SENSOR #2 .............................................................................................................................................................................15
COMPRESSOR RESTART TIME DELAY ...................................................................................................................................................................................15
ALARM OUTPUT CONTACT ....................................................................................................................................................................................................15
ALARM INPUT CONNECTION .................................................................................................................................................................................................16
ALARM CONDITION DISPLAY .................................................................................................................................................................................................16
AIR CONDITIONER UNIT COMMUNICATION FEATURES ......................................................................................................................................................16
USB COMMUNICATION ..................................................................................................................................................................................................16
ETHERNET COMMUNICATION ......................................................................................................................................................................................16
USING THE PC INTERFACE TOOL ...........................................................................................................................................................................................17
USB COMMUNICATION MODE.......................................................................................................................................................................................17
ETHERNET COMMUNICATION MODE ...........................................................................................................................................................................18
Remote Access Control Pin-out ..............................................................................................................................................................................................19
Schematic and Wiring Diagram for Remote Access Control ...............................................................................................................................................20
G52 1-Phase Generic Schematic (actual unit options may vary) ................................................................................................................................20
G52 Generic 3-Phase Schematic (actual unit options may vary) ................................................................................................................................21
G52 Generic Wire Diagram for Remote Access Control (actual unit options may vary)...........................................................................................22
G52 Generic 3-Phase Wire Diagram for Remote Access Control (actual unit options may vary) ............................................................................23
DIMENSIONAL DRAWINGS ..................................................................................................................................................................................24
G52 Generic Model Drawing With Remote Access Control..................................................................................................................................................24
INSTALLATION INSTRUCTIONS WITH REMOTE ACCESS CONTROL ..............................................................................................................25
MAINTENANCE.....................................................................................................................................................................................................26
Compressor ..............................................................................................................................................................................................................................26
Inlet Air Filter .............................................................................................................................................................................................................................26
How To Remove, Clean or Install a New Inlet Air Filter .........................................................................................................................................................26
Condenser and Evaporator Air Movers ..................................................................................................................................................................................27
Refrigerant Loss .......................................................................................................................................................................................................................27
Refrigerant Properties Chart (R 134a) ....................................................................................................................................................................................28
Functional Data ........................................................................................................................................................................................................................28
8000 BTU/Hr. Unit Characteristics .........................................................................................................................................................................................29
12000 BTU/Hr. Unit Characteristics .......................................................................................................................................................................................30
SERVICE DATA ......................................................................................................................................................................................................31
Components List ......................................................................................................................................................................................................................31
TROUBLE SHOOTING ...........................................................................................................................................................................................32
Basic Air Conditioning Trouble Shooting Check List - Thermostat Version ........................................................................................................................ 32
Symptoms and Possible Causes - Thermostat Version .......................................................................................................................................................33
Basic Air Conditioning Trouble Shooting Check List - Remote Access Control Version ...................................................................................................34
Symptoms and Possible Causes - Remote Access Control Version ................................................................................................................................... 35