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6-3

ection 6 Component Check Procedures

Defrost Timer

FUNCTION

Initiates the defrost cycle at preset times to

prevent evaporator frost buildup.

SPECIFICATIONS

Grasslin

See page 3-3 for defrost timer adjustment.

CHECK PROCEDURES

1. Inspect the terminals for clean, tight

connections.

2. Verify that correct line voltage is at terminals

X and 3.

Voltage at

Terminals

X and 3

Action

Correct

If 24-hour dial is not turning,

replace automatic defrost

time clock

None Restore line voltage

3. Hook a voltmeter across the switch

terminals. Verify the readings below. If you

do not get these readings, replace the defrost

timer.

Cycle Terminals Expected Reading

2 and 4 0 volts - closed

3 and N 0 volts - closed

Cooling

3 and 1 Line volts - open

2 and 4 Line volts - open

3 and N Line volts - open

Start of

Defrost

3 and 1 0 volts - closed

Defrost Heater Element

FUNCTION

Defrosts the evaporator coil.

COIL HEATER SPECIFICATIONS

Model

°F/°C

Volt Amp Watt Ohm

20/-6.7

45/7.2

115

3.5

7.0

400

800

14-18

70/21.1 230 3.5 800 64-67

1/-17.2

2/-16.7

115

230

9.6

8.5

1100

1950

8-12

26-30

14/-10

18/-7.8

115

5.2

600

20-24

36/2.2 230 4.8 1100 45-49

CHECK PROCEDURES

1. Turn off the electric power to the reach-in

freezer.

2. Disconnect the leads to the defrost heater and

check across with an ohmmeter. See

specifications (above) for ohm values.

Results of Check Action

Continuity and ohm

value within

specifications

Element is OK

No continuity Replace the element

Ohm value not within

specifications

Replace the element

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 95 96

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Randell Freezer Manuale di Servizio Pagina 51

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