Vintage Cellars Wine Guardian Water-Cooled Cooling System - Manual (Page 44)

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Heating Coil Option
It is located between the evaporator coil and blower inside the transition duct. It contains the heating
element and high temperature limit switches. The heating coil is wired to work in conjunction with the
thermostat. Since the thermostat prevents the heating and cooling circuits from being energized at the
same time, no additional power wiring is needed. We do recommend using the AUTO mode on the
thermostat so it can switch from heating to cooling automatically. If using either the heat or cool only
mode, the thermostat will not switch automatically.
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 tem-
perature 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 compres-
sor. 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
frequenct 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 eight (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.