Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 58

From the previous page.
Control modes
2-2. Actuator at the end of defrosting operation
2. Stop
3. Defrosting prohibition
time
4-1. Requirements for starting
4. Defrosting prohibition
time
4-2. Requirements for ending
Actuator will be activated by the following procedure if any of the above
conditions except d & e is detected.
1 Start the outdoor fan.
2 Let the compressor operation frequency down to 30Hz from the defrosting
operation frequency.
3 Stop the compressor for 1 minute when the compressor operation frequency
becomes 30Hz.
After 1 to 3 are completed, set the compressor operation frequency to the
normal (start-up pattern A).
Defrosting prohibition time (T1 and T3) are decided by the previous defrosting
operation time (t2).
• Prohibition time table for ordinary region
Previous operation time
t2 [ 3 minutes
3 < t2 [ 7 minutes
7 < t2 [ 10 minutes
10 < t2 [ 15 minutes
t2 = 15 minutes
• Prohibition time table for high humidity region
Previous operation time
t2 [ 7 minutes
7 < t2 [ 15 minutes
• Others
Previous operation time
Operation mode has been changed to the other mode
except HEAT during defrosting operation.
Protection devices have worked during defrosting operation.
Initial prohibition time when power is reset.
Compulsory defrosting operation will be conducted if all items below are
satisfied when SW1-1 (OFF
(Conditions)
a. The compressor is operating.
b. 10 minutes have passed since the compressor started or the last defrosting
operation was conducted.
c. The outdoor liquid pipe temperature is less than 8:.
Same conditions as the above ending conditions of normal defrosting
Control details
Prohibition time
T1 T3
100 minutes 30 minutes
60 minutes 20 minutes
50 minutes 20 minutes
30 minutes 20 minutes
20 minutes 20 minutes
Prohibition time
T1 T3
50 minutes 20 minutes
20 minutes 20 minutes
Prohibition time
T1
40 minutes
10 minutes
40 minutes
ON) is detected during HEAT operation.
58
Remarks
T3
40 minutes
10 minutes
40 minutes