CellarPro AIR HANDLER 6500 HORIZONTAL, 7090 - Manual (Page 38)

38
Continued - Troubleshooting Issues – Split System Configuration Only
Issue Possible Causes Potential Solutions
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” to ensure the
system is configured for maximum run time.
Low refrigerant
charge System charged incorrectly. Review process and
correct.
Leak in system. Find and repair leak, recharge
system.
Mal-functioning
thermostatic
expansion valve. Incorrect superheat setting: determine superheat
and adjust. If expansion valve is faulty, replace.
Expansion valve bulb not located correctly -
review installation instructions and correct.
Liquid flashing at the expansion valve inlet. See
"High liquid line pressure drop" section.
No airflow See "Evaporator fan not blowing" section
Insufficient liquid sub-
cooling Low refrigerant
charge System charged incorrectly. Review process and
correct.
Leak in system. Find and repair leak, recharge
system.
High liquid line
pressure drop Check for plugged filter drier and replace if
necessary.
Inspect pipe routing for proper piping practices
and correct.
Liquid line picking up too much ambient heat -
may need to insulate.