Viking VCBF036RSS Service Manual page 24

Component Testing
Component Description
ECM Condenser fan moves cooling air across
condenser condenser coil and compressor body.
motor
Condenser fan motor is in parallel circuit
with compressor.
Evaporator fan Evaporator fan moves air across
motor evaporator coil and throughout
refrigerator cabinet.
Refrigerator Single pole, single throw switch
light switch completes circuit for light when door is
open.
Freezer light/ Single pole, Double throw switch
Interlock completes circuit for light when door is
switch open. Completes circuit for dispenser
when door is closed.
Water valve Controls water flow to the ice maker.
Controlled by thermostat in ice maker.
See Ice Maker section for further
information.
Drier Drier is placed at post condenser loop
outlet and passes liquefied refrigerant to
capillary.
Desiccant (20) 8 x 12 4AXH - 7 M>S> -
Grams
24
Test Procedures
Check resistance across motor. If no resistance
across motor, replace motor.
1. Disconnect power to unit.
2. Disconnect fan motor leads.
3. Check resistance from ground connection
solder. Trace to motor frame must not exceed
.05 ohms.
4. Check for voltage at connector to motor with
unit in refrigeration mode and compressor
operating.
Check resistant across terminals.
Switch arm depressed
"NO" terminals Open
Switch arm up
"NO" terminals Closed
Check resistant across terminals.
Switch arm depressed:
• "NO" terminals Open
• "NC" terminals Closed
Switch arm not depressed:
• "NC" terminals Open
• "NO" terminals Closed
Check resistance across coil windings.
Drier must be changed every time the system is
opened for testing or compressor replacement.
NOTE: Drier used in R12 sealed system is not
interchangeable with drier used in R134a
sealed system. Always replace drier in
R134a system with correct part number.
Before opening refrigeration system, recover
HFC134a refrigerant for safe disposal.
1. Cut drier out of system using the following
procedure. Do not unbraze drier.
2. Applying heat to remove drier will drive
moisture into the system.
3. Score capillary tube close to drier and break.
4. Reform inlet tube to drier allowing enough
space for large tube cutter.
5. Cut circumference of drier 1 ¼" below
condenser inlet tube joint to drier.
6. Remove drier.
©2007 Viking Preferred Service