Refrigeration Cycle System Protection - Mitsubishi Heavy Industries FDT Series Technical Manual

Outdoor heat exchanger temperature = < 21ºC
a)
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)
21ºC < Outdoor heat exchanger temperature = <
b)
After the outdoor fan speed maintains at A speed for 20 seconds; if the outdoor heat exchanger temperature is 21ºC~
ºC, maintain outdoor fan speed.
After the outdoor fan speed rises (up) to 1 speed for 60 seconds; if the outdoor heat exchanger temperature is higher
ºC, gradually increase outdoor fan speed by 1 speed. (Upper limit 3rd speed)
3) Reset conditions:
a) The outdoor air temperature (TH2) is 25ºC or higher.
b) The compressor command speed is 0 rps.
(b) Heating
Operating conditions: When the outdoor air temperature (TH2) is 4ºC or lower continues for 30 seconds while the
1)
2) Detail of operation:
3) Reset conditions:
a) The outdoor air temperature (TH2) is 6ºC or higher.
b) The compressor command speed is 0 rps.

(16) Refrigeration cycle system protection

(a) Starting conditions
1) When 5 minutes (Heating : 9 minutes) have elapsed after the compressor ON or the completion of the defrost control
2) Other than the defrost control
3) When, after meeting the conditions of a) and b) above, the compressor speed, indoor air temperature (Th
indoor heat exchanger temperature (Th
Operation mode
Cooling
Heating
(b) Contents of control
1) When the conditions of 1) above are met, the compressor stops.
2) Error stop occurs when the compressor has stopped 3 times within 60 minutes.
(c) Resetting condition
ºC
compressor command speed is other than 0 rps.
-R) have met the conditions in the following table for 5 minutes:
I
Compressor speed (N) Indoor air temperature (Th1)
N 10 Th
=
N 0 Th
= =
-
ºC
Indoor air temperature (Th1)/
Indoor heat exchanger temperature (Th2)
Th
I
= =
Th
I
=
3 1 9 -
'12 • PAC-T-173
-R
I I
I I
-A) and
I