Hoshizaki AMERICA 73183 - Manual (Page 15)

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8) Cool Down Achieved–CTh cools to 3°F (1.7°C) below setpoint. EvapFM and MH
continue. Comp and ConFM de-energize. Diagnosis: Confirm Comp and ConFM
de-energize. If not, and Comp and ConFM were energized longer than 2 min., check
CTh status. See "II.D. Thermistor Check." If CTh ohm reading is in range and Comp
and ConFM continue longer than 2 min., check for 115VAC at CM C1 (R) to neutral (W).
If 115VAC is present, replace CM and DM with HS kit. If 115VAC is not present and
Comp and ConFM continue, check for 115VAC at CR #1 (R). If 115VAC is present,
replace CR.
9) Defrost–"dEF" is displayed during defrost. There is a 20-min. minimum defrost time,
a 1-hr. maximum defrost time, and a 2 hr. minimum defrost interval.
1a) Temperature-Initiated: DTh cools to 8.6°F (-13°C). EvapFM and MH continue.
Comp and ConFM de-energize.
1b) Manually-Initiated: To initiate a manual defrost, press and hold the lower button
for 5 seconds. "dEF" appears in the display. If energized, Comp and ConFM
de-energize.
2) Defrost Termination: DTh warms to 40°F (4.4°C). EvapFM and MH continue. Comp
and ConFM energize. 2-min. temperature display delay timer starts. 2 min. later,
cabinet temperature appears on DM.
Defrost Diagnosis:
a) Defrost Initiation: Has DTh cooled to 8.6°F (-13°C) or lower? Confirm DTh status.
See "II.D. Thermistor Check." If DTh is in proper range or manual defrost initiated,
confirm Comp and ConFM de-energize. If not, check for 115VAC at CM C1 (R) to
neutral (W). If 115VAC is present and DTh is within proper range, replace CM and
DM with HS kit. If there is no voltage at CM C1 (R) to neutral (W) and Comp and
ConFM do not de-energize, check for 115VAC at CR #1 (R) to neutral (W). If 115VAC
is present at CR l #1 (R) to neutral (W) and DTh is within proper range, replace CR.
b) Defrost Termination: Has DTh warmed to 40°F (4.4°C)? If not yet confirmed,
confirm DTh status. See "II.D. Thermistor Check." If DTh is in proper range, have
Comp and ConFM energized? If not, see "7d) Comp and ConFM Diagnosis"
above. 2-min. temperature delay timer terminates, temperature appears on display.
If temperature does not appear on display after 2-min., replace CM and DM with
HS kit.
Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;
CTh–cabinet thermistor; DM–display module; DS–door switch; DSR–door switch
relay;
DTh–defrost thermistor; EvapFM–evaporator fan motor;
HPS–high-pressure switch; MH–mullion heater