Master Bilt WCC-23SR, Service Manual

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18
ELECTRONIC CONTROLLER INSTRUCTION
No Function
Controlled
Description
Part
4 Defrost Heater
Function Compressor
Evap-Fan Motor
Con-Fan Motor
5 Forced Compressor
Defrost Evap-Fan Motor
Con-Fan Motor
Heater
6 Compressor Compressor
Restart Con-Fan Motor
Prevent
7 Power Comp.
Failure Evap-Fan Motor
Back-Up Con-Fan Motor
Function
8 Door opening Buzzer
Alarm function LED
9 Buzzer Buzzer
Function
A. Pre-Cool Step
a. It prevents from extreme temperature risie during defrost function.
b. Comp. Con-Fan Motor and Evap-Fan Motor run continuously during pre-cool
step.
c. 88 LED indicates inside temperature and bar LED indicates setting temperature
level.
d. If F-sensor is sensing lower temperature than -22°F(-30°C) or pre-cool step
interval reach in 30 minutes, pre-cool step goes off.
B. Heater defrost step
a. The defrost heater is energized.
b. 88 LED displays ‘dF’ and bar LED indicates setting temperature level.
c. The defrost heater warms the evaporator coil thereby melting all frost that
accumulated during the previous refrigeration cycle.
e. When D-sensor is higher than 50°F(10°C), heater goes off.
f. If for any reason D-heater’s On time exceeds 40 minutes for any reason, a back-
up defrost termination is also provided.
g. If D-sensor’s temperature does not reach 50°F(10°C) in 40 minutes, error code
will be recorded on a MICOM.
C. Pause step
a. Time = 3 minutes.
b. 88 LED displays 'dF' and bar LED indicate setting temperature. level.
D. Fan delay step
a. Max. Time = 5 min
b. Only Comp. Is On.
c. If D-sensor’s temperature goes down under 14°F in 5 minutes, Evap-Fan Motor
turns on immediately.
a. Press the MANUAL DEFROST button for the 5 seconds.
- Defrost mode can be canceled by pressing "MANUAL DEFROST" button for
the five seconds.
b. Forced defrost mode.
1) The pre-cool step is omitted.
2) Start from heater defrost step.
3) Next procedure is same as that of the defrost function.
1. Compressor will not come on for 3 minutes after compressor off, even though
the F-sensor is at on point.
1. Compressor will not start for 3 minutes after power failure.
2. Evap-Fan Motor is on.
1. If door is opened, fan operating indicating lamp turns off and door open
indicating lamp turns on.
2. If door is opened for more than 30 seconds, display will beep 3 times.
3. If door is opened for more than 60 seconds, display will beep 5 times.
4. If door is opened for more than 5 minutes, display will beep continuously.
1. Beep sound rings 1 time after initial power on.
2. Beep sound rirgs whenever each button is pressed.
3. Beep sound rings if door is opened a certain time period.
(See the door opening alarm function)
9
TEMPERATURE D.F.
8
7
6
5
4
3
2
1
FAN DOOR
MANUAL DEFROST
TEMPERATURE
˚F