21
ELECTRONIC CONTROLLER INSTRUCTION
No Function
Controlled
Description
Part
4 Defrost Heater
Function Compressor
F-fan
C-fan
5 Defrost Heater
Function Compressor
F-fan
C-fan
1. Defrost function is controlled by time interval setting.
2. Time interval can be set by shifting dip s/w on the PCB.
3. Time interval setting is as follows.
Dip Switch Cycle time
No.1 No.2 (hours)
00 12
10 10
01 8
11 6
4. Factory setting is 6 hours
5. The first defrost function will start at the half value of setting time.
1. Defrost step
Pre-cool Heater defrost Pause Fan Delay
Comp. on off off on
F-fan on off off off
C-fan on off off on
Heater off on off off
Max time 30 min. 40 min. 3 min. 5 min.
If D-sensor temperature If D-sensor
is over 50˚F, heater temp. lower
goes off. than 14˚F,
If D-sensor is in error, then F-fan
heater goes off turns on
automatically 40 min immediately
after activated.
A. Pre-Cool Step
a. It prevents exceeding temperature rise during defrost function.
b. Comp., C-fan and F-fan run continuously during pre-cool step.
c. 88 LED indicates inside temp. and bar LED indicates setting temperature level.
d. Maximum pre-cool time is 30 min.
e. If F-sensor detects 1.8˚F lower temp. than lowest comp. off temp., in a 30 min.,
pre-cool step goes off.
f. Turbo Freeze mode is only one time prior to pre-cool step.
B. Heter defrost step
a. The defrost heater is energized.
b. 88 LED displays ‘dF’ and bar LED indicates setting temp. level.
c. The defrost heater warms the evaporator coil thereby melting all frost
accumulated during the previous refrigeration cycle.
d. When D-sensor is higher than 50˚F(10˚C), heater goes off.
e. If for any reason D-heater’s on time excess 40 min., a back-up defrost
termination is also provided.
f. If D-sensor’s temp. didn’t reach 50˚F(10˚C)
in 40 min., error code will be recorded on a
MICOM.
C. Pause step
a. Time = 3 min.
b. 88 LED displays ‘dF’ and bar LED indicates setting temp. level.
D. Fan delay step
a. Max. Time = 5 min
b. Only Comp. and C-fan are on.
c.
If D-sensor temp. goes down under 14˚F in 5 min., then F-fan turns on immediately.
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