Defrost - Hoshizaki Steelheart B Series Service Manual

B. Defrost
There are 2 types of defrost: Off Cycle Defrost (with evaporator fan motor) and Heated
Defrost (without evaporator fan motor).
Manual Initiation (All Models): Unplug the appliance from the electrical outlet,then
move the cabinet temperature control dial to the off position. Plug the appliance back
into the electrical outlet. The Green, Yellow, and Red LED turn on briefly. Rotate the
cabinet temperature control dial clockwise to position 4 (Yellow LED), counter-clockwise
to position 2 (Red LED), clockwise to position 8 (Green and Red LED). Defrost initiates.
See Fig. 2. Note: Once on the number position, confirm the appropriate LED turns on.
If not, move the cabinet temperature control dial back and forth until the LED turns on.
Once on, move to the next position. Defrost initiated.
1
2
3
2
Temperature Initiation: Evaporator temperature (defrost thermistor) achieves:
a) UR/WR: -4
F (-20
°
b) SR: No temperature initiation. Time only.
c) UF/WF: -31
F (-35
°
Defrost initiates. 1-hr. defrost lockout between defrost on UR/WR and UF/WF.
Time Initiation: 5-hr. cumulative compressor run timer terminates, defrost initiates.
a) UR/WR: 5-min. minimum and 55-min. maximum. Evaporator fan motor continues.
b) SR: 5-min. minimum and 45-min. maximum. Evaporator fan motor de-energizes
c) UF/WF: 1-hr. maximum defrost timers starts. Evaporator fan motor de-energizes.
Manual Termination: Turn the CTCD to the "OFF" position, then back to original setting
or unplug the appliance from the electrical outlet, then plug the appliance back into the
electrical outlet. Defrost terminated.
Temperature/Time Termination: Evaporator termination temperature (defrost
thermistor) achieved or backup maximum defrost timer terminates.
UR/WR: DTh warms to 45°F (7.2°C) or 55-min. max. defrost timer terminates.
SR: DTh warms to 46°F (7.7°C) or 45-min. max. defrost timer terminates.
UF/WF: DTh warms to 55°F (12.7°C) or 1-hr. max. defrost timer terminates.
Cabinet Temperature Control Dial
Fig. 2
C) or lower.
°
C) or lower.
°
2
2
4
2
28