37
Cleaning the Humidifier (Optional)
If the unit was furnished with a humidifier, it requires periodic maintenance. Follow the
instructions in the humidifier guide.
Electric Heat
The heating coil 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 only 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 temperature should rise above the return air temperature by
an amount shown in the specifications.
Extreme Climate Protection
The purpose of the Extreme Climate Protection 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 to 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 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 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 times/hour.
Summary of Contents for 99H0204-20
Page 12: ...12 Overview of the Evaporator Fig 1...
Page 14: ...14 Overview of the Condenser Fig 2...
Page 15: ...15 Refrigeration Illustration Fig 3...
Page 16: ...16 Wiring Diagram for SP25 Fig 4 DS025 Condenser...
Page 18: ...18...
Page 19: ...19 Specifications Wine Guardian Specification Sheet 60Hz models...
