Warranty and Return Policy ................................................................................................................................................................................... 3
RECEIVING 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
DIMENSIONAL DRAWING .................................................................................................................................................................................... 10
INSTALLATION INSTRUCTIONS .......................................................................................................................................................................... 11
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 Lead/Lag mode ....................................................................................................................................................................... 19
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
MAINTENANCE .................................................................................................................................................................................................... 29
Compressor .............................................................................................................................................................................................................................. 29
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
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.
- 2 -
TABLE OF CONTENTS
© 2022 nVent
89209668