Service manual

Section 7 Electrical Specifications
7-3
Defrost Timer
Function
Initiates the defrost cycle at preset times to prevent
evaporator frost buildup.
Specifications
Paragon 8145-00
See page 5-3 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
115
7.0
7.0
800
800
14-18
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
115
5.2
5.2
600
600
20-24
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