Viking VUAR144 - Component Testing Procedures; Evaporator Plate and Compressor Testing; Capacitor and Condenser Testing

Component Testing Procedures
16 SMR-0003 © Viking Range Corporation
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
Component Test Procedure Service Action
Evaporator Plate
Perform visual check of frost pattern on
evaporator plate...................................... A uniform frost pattern indicates a satisfactory •
ow of refrigerant through evaporator.
An incomplete or uneven frost pattern indicates •
a possible blockage in evaporator or a low
refrigerant charge in the system.
Compressor
Disconnect power to unit.1.
Discharge run capacitor by shorting 2.
across terminals with a resistor 1
minute (some models)
Remove leads from compressor 3.
terminals.
Set ohmmeter to lowest scale.4.
Check for resistance/continuity 5.
across the following:
Start winding/Run winding (See •
Compressor section) ........................
Run/Common/Start terminals to •
compressor housing .........................
If run winding or start winding reads high to •
innite resistance (open), replace compressor.
If run winding or start winding reads no •
resistance (dead short), replace compressor.
If continuity to ground is found in any of the •
three terminals, replace compressor.
Run Capacitor
(some models)
Disconnect power to unit.1.
Remove capacitor from circuit.2.
Discharge capacitor by shorting 3.
terminals with a resistor for 1
minute.
Check resistance across capacitor 4.
terminals with ohmmeter set to kΩ
scale ................................................. Good - needle swings to zero and slowly •
moves back to innity.
Open - needle does not move. Replace run •
capacitor.
Shorted - needle moves to zero and stays. •
Replace run capacitor.
High resistance leak - needle jumps to •
zero and then moves back to constant high
resistance (not innity). Replace run capacitor.
Condenser
Perform visual check to ensure that
sufcient airow passes over the
condenser ............................................... Ensure that there is no blockage of the intake •
or exhaust side of condenser.
Ensure that condenser is free of dust, lint, or •
hair that may hinder heat transfer.