CellarPro AIR HANDLER 6500 HORIZONTAL, 7090 - Manual (Page 36)

36
Troubleshooting Issues – All Configurations
Issue Possible Causes Potential Solutions
No cooling: no refrigerant flow.
If the "snowflake" icon is
illuminated on the
temperature display control
and the compressor
running.
No power to
compressor Power supply to Condensing Unit interrupted.
Restore power.
Check for loose wires and reconnect.
High pressure
safety shutdown
/ high discharge
pressure Locate and correct source of high condensing
head pressure
Condenser fan not operating in ambient
temperatures above 90°F. Ensure that there is
power to the Condensing Unit.. Replace
condenser fan if necessary.
Dirty or obstructed condenser coil: clean and remove
all obstructions to airflow
Insufficient ventilation: reference Condensing
Unit installation guidelines for proper placement
and ambient temperature requirements. Correct
to ensure adequate air ventilation to and from the
Condensing Unit.
Intermittent
power to
compressor
Check for loose wires and secure.
Compressor cycling on internal thermal overload
protection. Replace start capacitor/relay
assembly
Faulty compressor. Consult factory
No cooling: Evaporator fan
not blowing.
If the "fan" icon is illuminated
on the temperature display
control, the fan should be
blowing air.
No power to fan Power supply to Evaporator interrupted. Restore
power.
Power supply to fan interrupted: loose wire.
Inspect for loose fan wiring and reconnect.
Fan obstructed With power to unit disconnected, check the
rotation of the blower fan. If fan does not spin
freely, inspect for and remove obstructions. If no
obstructions are found, the fan may need to be
replaced. Consult factory.
Fan running but
not drawing air
through coil. Fan short cycling: Make sure all housing panels
are attached to the unit. Replace missing panels.
Coil is blocked with ice. Refer to the "Iced coil"
section.
Iced coil Insufficient number
of defrosts Turn system off and melt ice from coil. Decrease
the defrost interval from the default value of 16
hours by changing second level parameter "idF"
to a minimum setting of 4 hours. If this corrects
the problem, optimize the defrost frequency by
setting and observing the system at different set
points above “4” and below “16”..
Low refrigerant
charge Leak in system. Find and repair leak, recharge
system
Mal-functioning
expansion valve. If expansion valve is faulty, replace.
No airflow See "Evaporator fan not blowing" section