Mitsubishi Heavy Industries SRK60ZJX-S, Technical Manual

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'10 • SR-T-091
(p) Outdoor fan control at low outdoor temperature
◆
Cooling
1) Operating conditions:
When the outdoor air temperature (TH2) is 22ºC or lower continues for 30 seconds while the
compressor command speed is other than 0 rps.
2) Detail of operation:
After the outdoor fan operates at A speed for 60 seconds; the corresponding outdoor heat
exchanger temperature shall implement the following controls.
a) Outdoor heat exchanger temperature =< 21ºC
After the outdoor fan speed drops (down) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is
lower than 21ºC
, gradually reduce the outdoor fan speed by 1 speed. (Lower limit 1st speed)
b) 21ºC < Outdoor heat exchanger temperature =< 38ºC
After the outdoor fan speed maintains at A speed for 20 seconds; if the outdoor heat exchanger temperature is 21ºC~
38ºC, maintain outdoor fan speed.
c) Outdoor heat exchanger tempeature > 38ºC
After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is higher
than 38ºC, gradually increase outdoor fan speed by 1 speed. (Upper limit 3rd speed)
3) Reset conditions:
When either of the following conditions is satisfied
a) The outdoor air temperature (TH2) is 25ºC or higher.
b) The compressor command speed is 0 rps.
◆
Heating
1) Operating conditions:
When the outdoor air temperature (TH2) is 4ºC or lower continues for 30 seconds while the
compressor command speed is other than 0 rps.
2) Detail of operation:
The outdoor fan is stepped up by 2 speed step at each 20 seconds. (Upper limit 8th speed)
3) Reset conditions:
When either of the following conditions is satisfied
a) The outdoor air temperature (TH2) is 6ºC or higher.
b) The compressor command speed is 0 rps.
(q) Refrigeration cycle system protection
1) Starting conditions
a) When 5 minutes have elapsed after the compressor ON or the completion of the defrost control
b) Other than the defrost control
c) When, after meeting the conditions of a) and b) above, the compressor speed, indoor air temperature (Th1) and in-
door heat exchanger temperature (Th2) have met the conditions in the following table for 5 minutes:
Compressor speed (N) Operation mode
Cooling
Heating
Indoor air temperature (Th1)
Th1−4<Th2
Indoor air temperature (Th1)/
Indoor heat exchanger temperature (Th2)
Th2<Th1+6
10 Th1 40 <
=
<
=
0 Th1 40 <
=
<
=
50(40) N <
=
50(40) N
<
=
Note (1) Value in ( ) are for the model 50, 60.
2) Contents of control
a) When the conditions of 1) above are met, the compressor stops.
b) Error stop occurs when the compressor has stopped 3 times within 60 minutes.
3) Resetting condition
When the compressor has been turned OFF
Outdoor temperature > 10˚C
Outdoor temperature <= 10˚C
2nd speed
Outdoor fan
1st speed
¡
Value of A