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No additional maintenance is required for the heating coil. To test the heating coil operation,
set the thermostat on HEAT and set the temperature above the cellar temperature. The supply
air temperature should rise above the return air temperature by an amount shown in the
specifications.
Low Ambient Option
The purpose of the Low Ambient Option is to protect the compressor and refrigerant system.
It has two distinct components, a crankcase heater to keep the oil in the compressor warm and
prevent slugging on system start-up and a head pressure control to cycle the condenser fan on
and off automatically to maintain system head pressure.
To confirm that the system is working, feel the bottom of the heater when the compressor unit
has cycled off. When the unit starts, the condenser fan does not start at the same time as the
compressor. The condenser fan starts after the head pressure has built up. As the unit is
running the condenser fan cycles off and on while it holds the head pressure within a fixed
range. The amount of cycling (frequency and duration) depends on the air temperature. The
colder the air, the more frequent the cycling and with a longer duration.
Maintenance Schedule
Monthly
(or quarterly depending on experience with individual cellar)
Check filter and drain trap – clean if needed.
Check for noise or vibration.
Check for short-cycling of the unit – a turning on and off of the compressor unit
more than either (8) times/hour.
Yearly
(in addition to monthly)
Replace filters if worn or plugged beyond cleaning.
Check evaporator and condenser coils for dirt – use a vacuum with a brush
attachment to clean the coils.
Clean condensate pan under the evaporator coil by flushing. Be careful to keep the
drain pans clear of any and all debris.
Inspect cabinet for corrosion or rusting – clean and paint.
Inspect for dirt buildup on or inside the unit. Clean unit by vacuuming or wiping it
down.
Check for loose insulation, fasteners, gaskets or connections.
Check the wiring connections and integrity or cords.
Examine ducts for any cracks or breach.
Check fan and solenoid on humidifier.
Replace humidifier pad (if used).
