Air innovations 99H0360-10, Installation, Operation And Maintenance Manual, Page: 80 / 85

80
Unit is operating and blows evaporator air but the supply air is not colder than the
return air from the cellar
Possible Cause Solution
Remote interface controller not set up
properly
Compressor not operating
Condenser airflow is blocked
Check remote interface controller setup in
the manufactures guide
High pressure switch open (button up)
Alarm will appear on remote interface controller
Remove blockage
Clean filter and coil (if needed)
Head Pressure (HP) switch is open
Reset HP switch
See reset instructions on pg. 70
Cellar temperature too cold (below 51° (10°C) when unit is running
Possible Cause Solution
Remote interface controller set too low
on cooling
Heating coil (optional) not operating
Remote interface controller set too low
on heating
Remote interface controller not controlling
temperature
Reset remote interface controller to
higher cooling temperature
Check for remote interface controller rise
across coil
Reset remote interface controller to
higher heating temperature
Remote interface controller mounted in
improper location
Cellar temperature too cold (below 51° (10°C) when unit is not running
Possible Cause Solution
Too much heat loss to adjacent spaces
Cellar loads are too high
Increase insulation around the ductwork
Check and clean filter and coil
Coil frozen – shut off unit for two hours
Install additional insulation
Humidity too low or supply air is too cold, without optional humidifier
Possible Cause Solution
Not enough evaporator airflow
Defective thermal expansion valve
Temperature set too cold
Remove blockage in supply or return ductwork
Check and clean filter and coil
Coil frozen – shut off unit for two hours
If under warranty call for service
If not under warranty call a refrigeration
technician
Raise temperature setpoint