Hoshizaki 73183 Refrigerator User Manual


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12
B. Sequence of Operation
1. Sequence Cycles and Shutdown
The steps in the sequence are as outlined below.
Note: 1. There is a slight delay at startup.
2. When power is turned on, the 2-hour high-temperature alarm timer is bypassed.
Therefore, a high-temperature alarm can occur at startup. To silence the alarm,
press and release the upper button. Alarm clears once temperature is within
factoryparameters.Fordetails,see"II.D.2.AlarmSafeties."
3. There is a 2-minute minimum Comp on time and a 2-minute minimum Comp off
time.
4. EvapFM de-energizes when door is opened on FS and when upper door is
opened on HS.
5. A oat-switch controlled condensate pump (located on top of the unit) is used to
pump evaporator condensation to the condensate pan.
6. On freezers, EvapFM is de-energized during defrost.
a) Refrigerator
1. Startup/Cool Down
EvapFM and MH energize. There is a slight delay before cabinet temperature or
high-temperature alarm (Hi) appears on DMand Comp and ConFM energize.
2. Cool Down Achieved
CM monitors cooling of the cabinet via CTh. CTh cools to 3°F (1.7°C) below setpoint.
EvapFM and MH continue. Comp and ConFM de-energize.
3. Cool Down Restart
CTh warms to 3°F (1.7°C) above setpoint. EvapFM and MH continue. Comp and ConFM
energize.
4. Defrost
"dEF"isdisplayedduringdefrost.Thereisa20-minuteminimumdefrosttimeanda
1-hour maximum defrost time.
a) Temperature Initiation: When DThcools to 8.6°F (-13°C) defrost begins. EvapFM and
MH continue. Comp and ConFM de-energize.
b) Manual Initiation: Manual defrost may be initiated by pressing and holding the lower
buttonuntil"dEF"appearsonDM.EvapFMandMHcontinue.CompandConFM
de-energize.
c) Termination: DTh warms to 40
°F (4.4°C). EvapFM and MH continue. Comp and ConFM
energize, 2-minute temperature display delay timer starts.
2-minute temperature display delay timer terminates and temperature display returns
to DM.
Note: There is a 2-hour minimum defrost interval.
Legend: CM–control module; Comp–compressor; ConFM–condenser fan motor;
CTh–cabinet thermistor; DM–display module; DTh–defrost thermistor;
EvapFM–evaporator fan motor; MH–mullion heater
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