-
44
-
(ii) Changing the defrosting start temperature
Turn the DIP switch (SW3-1) on the outdoor unit’s control PCB ON.
1) Defrosting condition A
After defrosting ends, 30 minutes passes cumulatively of the compressor running in a heating operation.
2) Defrosting condition B
After defrosting ends, 25 minutes passes cumulatively of the compressor running in a heating operation.
3) Other than items 1) and 2) above, other conditions are the same as the standard conditions.
(iii) Defrosting end conditions
If any of the following conditions is satisfied, the defrosting end operation starts.
1) 10 minutes and 20 seconds have passed since defrosting started.
2) When the outdoor heat exchanger temperature (sensed by Tho-R1, whichever one senses the lower temperature) is
12
°
C or higher continuously for 10 seconds.
(g)
Compressor protective control
( i ) Discharge pipe temperature control
If the discharge pipe temperature (Tho-D) after the compressor starts becomes higher than the set temperature, the
compressor’s speed is controlled to suppress the rise in the discharge pipe temperature. If it rises still higher, the com-
pressor is stopped.
1) Compressor speed control
2) Discharge pipe temperature abnormal
a) If the discharge pipe temperature has risen to 115
°
C or higher, the compressor is stopped. If it drops to 85
°
C or
lower, the compressor restarts automatically.
b) If the discharge pipe temperature is sensed to be 115
°
C or higher 2 times within a period of 60 minutes, or for 60
minutes continuously while the compressor is stopped, an abnormal stop (E36) is carried out.
Note (1) If the temperature does not drop to 85
°
C or lower continuously for 45 minutes after a discharge pipe temperature error occurs,
operation cannot be restarted. (This can be set using the remote controller.)
(ii) Power transistor temperature control
If the power transistor temperature (Tho-TR) rises to 85
°
C or higher, the compressor speed is controlled. If the power
transistor temperature drops to 81
°
C or lower, this control ends and the speed protection cancel operation starts.
100
105
Reset
Retention
The speed is reduced once every minute
Discharge pipe temperature (˚C)
85
115
Compressor operation
Compressor stops
Discharge pipe temperature (˚C)
81
85
Reset
Retention
The speed is reduced once every minute
Power transistor temperature (˚C)
