47
D.
Defrost Termination: Defrost Completion
1a)
Freezer (auxiliary code P-5 and earlier)–LEDs 4 (Comp) and 5 (ConFM) are
on. LED 3 (EvapFM on) off:
When CTh reads 15
°
F (8.3
°
C) above setpoint or less,
cabinet temperature is displayed on DB. Defrost is complete.
1b)
RFH1-SSB(-HS)(-HSE) Freezer–LEDs 4 (Comp and ConFM) and 5 (DrH, PH,
and MH) are on. LED 3 (EvapFM on) off:
When CTh reads 15
°
F (8.3
°
C) above
setpoint or less, cabinet temperature is displayed on DB. Defrost is complete.
Legend:
CB
–control board;
ConFM
–condenser fan motor;
Comp
–compressor;
CTh
–cabinet thermistor;
DB
–display board;
DH
–defrost heater;
DrH
–drain heater;
DT
–defrost thermostat;
DTh
–defrost thermistor;
EvapFM
–evaporator fan motor;
MH
–mullion heater;
PH
–perimeter heater;
TXV
–thermostatic expansion valve
2b. Freezer (auxiliary code P-6 and later) and RFH1-SSB-HD Freezer
7)
Startup–No component LEDs are on. LED 3 (EvapFM on) is off:
EvapFM energizes.
2.5 min. Comp delay timer starts. Cabinet temperature appears on DB.
a)
EvapFM Diagnosis:
If EvapFM does not energize, make sure "door" is not
displayed on DB. If so, check that CB dip switch #3 is in the factory default position.
See, "II.E.4.c) Door Switch Type (S3 dip switch 3)." Check door switch continuity.
Next, check for 115VAC at CB K1 connector pin #3 (DBU wire) to a neutral (W wire).
If 115VAC is not present, replace CB. If 115VAC is present, check EvapFM blade for
binding and EvapFM continuity.
8a)
Cool Down–Freezer: LEDs 4 (Comp) and 5 (ConFM) are on (except RFH1-SSB-HD).
LED 3 (EvapFM on) is off:
2.5 min. Comp delay timer terminates. EvapFM continues.
Comp and ConFM, energize. 2.5 min. Comp minimum run timer starts.
8b)
Cool Down–RFH1-SSB-HD Freezer:LED 4 (Comp and ConFM) is on. LED 3
(EvapFM on) is off. LED 5 (CPH and DrH) is on after first cool down cycle:
2.5 min.
Comp delay timer terminates. EvapFM continues. CPH and DrH continue (after first cool
down cycle). Comp and ConFM, energize. 2.5 min. Comp minimum run timer starts.
a)
Comp Diagnosis:
Check that Comp energizes. If Comp does not energize, check
for 115VAC at CB K1 connector pin #10 (GY wire) to a neutral (W wire). If 115VAC is
not present, replace CB. If 115VAC is present, check for 115VAC at Comp relay black
(BK wire) and red (R wire) to a neutral (W wire). If 115VAC is not present on the
black (BK wire), check wiring connections. If 115VAC is present on black (BK wire)
but not on the red (R wire), Comp relay contacts are open. Confirm 115VAC on Comp
relay coil gray (GY wire) to a neutral (W wire). If 115VAC is present, and contacts
are open, replace Comp relay. Next, if 115VAC is present on the red (R wire), check
continuity of Comp overload. If overload is closed, check start capacitor, start relay,
and Comp motor winding. If overload is open, let overload cool and reset. Replace
overload if it does not reset. When overload closes, if Comp still does not start, check
start capacitor, start relay, and Comp motor winding.
