Viking VUAR140 Troubleshooting Guide download pdf (Page 73)

Component Description Test Procedures

Motor, DC fans Refrigerator fan circulates See Refrigeration and Defrost Component Checks made at high

cold air into refrigerator voltage board. For DC fan voltage check procedures at high

voltage board.

Condenser evaporation fan Check for voltage across terminals.

And out through toe grille

to assure complete conden-

sate evaporation.

DC fan motors are

connected in series with

semi-conductor switch.

Overload/Relay Overload is a temperature 1. Disconnect power to the refrigerator.

and current sensing device. 2. Remove relay cover and pull relay off compressor. Pull

overload protector off compressor common terminal.

Overload opened when high 3. With ohmmeter, check the resistance between male terminal

current or high compressor and female pin receptacle terminal which pushes onto

temperature is sensed. compressor common terminal. At ambient room

temperature overload protector should have less than 1 ohm

resistance. An open overload protector will have infinite

After overload opens, reset resistance.

Can require up to two hours

Depending on ambient

Temperature and residual

Heat load in compressor. Relay (see PTC relay)

Relay, PTC When voltage is connected With power off check resistance across terminals 2 and 3. Refer

and relay is cool, current to Technical Data Sheet for values for model being serviced.

passed through relay to

start winding. After a short

time, current heats the

resistor in relay and

resistance will rise blocking

current flow through relay.

Start winding remains in the

circuit through run capacitor.

Solid state relay plugs

directly on compressor

start and run terminals

relay terminals 2 and 3 are

connected within relay. Run

capacitor is connected to

relay terminal 3. L2 side of

the 120 VAC power is

connected to relay terminal 2.

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Viking VUAR140 Troubleshooting Guide Page 73

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