© 2022 nVent
89209668
- 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.
TABLE OF CONTENTS
Warranty and Return Policy ................................................................................................................................................................................... 3
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
115V to 10V or 230V to 10V Transformer (optional) ..................................................................................................................................................... 4
115V to 24V or 230V to 24V Transformer and Relay (optional) ................................................................................................................................... 4
Schematics and Wiring Diagrams for Thermostat Control .................................................................................................................................................... 5
G521216GXXX Generic Schematic (actual unit options may vary) .............................................................................................................................. 5
G520816GXXX Generic Schematic (actual unit options may vary) .............................................................................................................................. 5
G521216GXXX Generic Wire Diagram (actual unit options may vary) ......................................................................................................................... 6
G52 8K AND 12K 230V Generic Schematic (Actual Unit Options May Vary)............................................................................................................... 7
G520816GXXX Generic Wire Diagram (actual unit options may vary) ......................................................................................................................... 8
G52 8K AND 12K 230V Generic Wire Diagram (Actual Unit Options May Vary) .......................................................................................................... 9
DIMENSIONAL DRAWING .................................................................................................................................................................................... 10
INSTALLATION INSTRUCTIONS .......................................................................................................................................................................... 11
DIGITAL THERMOSTAT CONTROLLER (OPTIONAL) ......................................................................................................................................... 12
Overview.................................................................................................................................................................................................................................... 12
ENERGIZING THE CONTROLLER ............................................................................................................................................................................................ 12
CONTROL STATUS INDICATION ............................................................................................................................................................................................. 12
DISPLAYING AND CHANGING PROGRAM Settings .............................................................................................................................................................. 15
To view or access the settings ....................................................................................................................................................................................... 15
Heat/Cool Operating Parameters ........................................................................................................................................................................................... 15
Alarm Parameters .................................................................................................................................................................................................................... 15
DISPLAYING TEMPERATURE DATA ON SCREEN .................................................................................................................................................................. 17
COMPRESSOR RESTART TIME DELAY................................................................................................................................................................................... 17
ALARM OUTPUT CONTACT .................................................................................................................................................................................................... 17
ALARM INPUT CONNECTION ................................................................................................................................................................................................. 17
PRIMARY-SECONDARY (PS) MODE ....................................................................................................................................................................................... 18
Connecting units together in Primary/Secondary mode ...................................................................................................................................................... 18
Connecting units together in Lead/Lag mode ....................................................................................................................................................................... 19
AIR CONDITIONER UNIT REMOTE COMMUNICATION FEATURES ...................................................................................................................................... 20
USB COMMUNICATION .................................................................................................................................................................................................. 20
ETHERNET COMMUNICATION ...................................................................................................................................................................................... 20
USING HOFFMAN PC INTERFACE TOOL ............................................................................................................................................................................... 21
USB COMMUNICATION MODE ...................................................................................................................................................................................... 21
USB COMMUNICATION MODE ...................................................................................................................................................................................... 22
ETHERNET COMMUNICATION MODE .......................................................................................................................................................................... 23
REMOTE ACCESS CONTROL PIN-OUT ................................................................................................................................................................................... 24
Schematic and Wiring Diagram for Remote Access Control ............................................................................................................................................... 25
G52 8K and 12K 115V Generic Schematic (actual unit options may vary) ................................................................................................................ 25
G52 8K and 12K 230V Generic Schematic (actual unit options may vary) ................................................................................................................ 25
G52 8K AND 12K 115V Generic Wire Diagram for Remote Access Control (actual unit options may vary) .......................................................... 26
G52 8K AND 12K 230V Generic Wire Diagram for Remote Access Control (Actual Unit Options May Vary) ........................................................ 27
INSTALLATION INSTRUCTIONS WITH REMOTE ACCESS CONTROL ............................................................................................................. 28
MAINTENANCE .................................................................................................................................................................................................... 29
Compressor .............................................................................................................................................................................................................................. 29
Inlet Air Filter ............................................................................................................................................................................................................................. 29
How To Remove, Clean or Install a New Inlet Air Filter ......................................................................................................................................................... 29
Condenser and Evaporator Air Movers .................................................................................................................................................................................. 30
Refrigerant Loss ....................................................................................................................................................................................................................... 30
Refrigerant Properties Chart (R 134a) .................................................................................................................................................................................... 31
Functional Data ........................................................................................................................................................................................................................ 31
8000 BTU/Hr. Unit Characteristics ......................................................................................................................................................................................... 32
12000 BTU/Hr. Unit Characteristics ....................................................................................................................................................................................... 33
SERVICE DATA ...................................................................................................................................................................................................... 34
Components List ...................................................................................................................................................................................................................... 34
F-GAS INFORMATION .......................................................................................................................................................................................... 35
TROUBLE SHOOTING ........................................................................................................................................................................................... 36
Basic Air Conditioning Trouble Shooting Check List - Thermostat Version ........................................................................................................................ 36
Symptoms and Possible Causes - Thermostat Version ....................................................................................................................................................... 37
Basic Air Conditioning Trouble Shooting Check List - Remote Access Control Version ................................................................................................... 38
Symptoms and Possible Causes - Remote Access Control Version ................................................................................................................................... 39
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