7.2 Thermistors
The wine cellar utilizes two thermistors, one as the upper zone display thermistor and the other as the
lower zone display thermistor.
The upper zone thermistor (part number 41050208) is connected to the LED display and displays the
temperature inside the upper compartment.
The lower zone thermistor (part number 41050209) is connected to the LED display and displays the
temperature inside the lower compartment.
Both thermistors individually maintain their compartment set-points by cycling the compressor along
with their individual compartment fans.
In addition each heater/fan assembly is also cycled to maintain the desired set-point. This will occur only
when a compartment set-point is greater or equal to 49˚F. When a call for heat is detected, the compres-
sor, condenser, & compartment fan will cycle off and the heater/fan for that compartment will turn on
until set-point is obtained.
The display panel will flash E3 for a failure of the upper thermistor and E4 for a lower thermistor failure.
If both thermistors fail, the code will be displayed sequentially. An audible alarm will also sound six
times every minute if either one or both thermistors fail.
7.2.1 To Check Thermistor Resistance
1) Disconnect power to the wine cellar and drop the User Interface Control Housing to access the therm-
istor connections on back side of the board. (See figures 12.35 & 12.36).
2) Unplug the appropriate connector on the rear of the User Interface board.
3) Determine the temperature of the thermistor at its present location. Refer to the following chart and
determine the approximate resistance value of the thermistor to be tested.
4) With an ohm-meter, measure the resistance of the thermistor by inserting the tips of the test leads into
the two small holes on the thermistor plug previously removed.
5) Record the resistance value shown on the ohm-meter and determine if it corresponds to the reference
chart below.
6) If the resistance value falls outside the resistance values given by 4% or greater, the thermistor needs
to be replaced.
SEE PHOTO SECTION FOR REFERENCE TO ABOVE MENTIONED FIGURES
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Страница 10: ...Section 2 Dual Zone Characteristics 2010 Viking Preferred Service SMR 0005 ...
Страница 16: ...Section 3 Refrigeration Systems 2010 Viking Preferred Service SMR 0005 ...
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Страница 30: ...Section 5 Mechanical System Components 2010 Viking Preferred Service SMR 0005 ...
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