Heating High Pressure Control; Heating Overload Protective Control; Indoor Heat Exchanger Temperature - Mitsubishi Heavy Industries FDT Series Technical Manual

Upper limit 60 rps
ON
Lower limit 45 rps
A B
(c) Reset conditions:
1) The outdoor air temperature (TH2) is D ºC or higher.
2) The compressor command speed is 0 rps.
(5)

Heating high pressure control

(a) Purpose: Prevents anomalous high pressure operation during heating.
(b) Detector: Indoor heat exchanger thermistor (Th
(c) Detail of operation:
(Example) Fuzzy
Notes (1) When the indoor heat exchanger temperature is in the range of B~C ºC, the speed is reduced by 4 rps at each 10seconds.
or higher continues for 1 minute, the compressor is stopped.
(3) When the indoor heat exchanger temperature is in the range of A~B ºC, if the compressor command speed is been maintained and the operation has contin-
ued for more than 10 seconds at the same speed, it returns to the normal heating operation.
(4) Indoor blower retains the fan tap when it enters in the high pressure control. Outdoor blower is operated in accordance with the speed.
Temperature list
RPSmin < 50
50 < = RPSmin < 115
115 < = RPSmin < 120
120 < = RPSmin
Note (1) RPSmin: The lower one between the outdoor speed and the compressor command speed

(6) Heating overload protective control

(a) Indoor unit side
1) Operating conditions :
2) Detail of operation :
3) Reset conditions :
ON
Upper limit 75 rps
Lower limit 35 rps
C D
Outdoor air temperature (°C)
After lapse of 10 sec. or over
After lapse of 10 sec. or over
After lapse of 10 sec. or over
A
Indoor heat exchanger temperature(°C)
A B
45 52
45 52
45 ~ 43 52 ~ 50
43 50
Values of A, B, C, D
OFF
First time
Since the seconds
times
-R)
I
(1)
(3)
4rps
(3)
4rps
lower limit
(3)
speed 35rps
B
C
54.5
57
57 61 ~ 59
55
H
H
- 316 -
'12 • PAC-T-173
Outdoor air temp. (˚C)
A B
9 11
16 19
(2)
8rps
(1) (2)
8rps
0rps
C D
Unit : ºC
D
61
61
59
C D
22 25
25