Heating High Pressure Control - Mitsubishi Heavy Industries FDT40VF Technical Manual

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Upper limit 60 rps
ON
Lower limit 45 rps
A
B
(c) Reset conditions: When either of the following condition is satisfied
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.
(2) When the indoor heat exchanger temperature is in the range of C~D ºC, the speed is reduced by 8 rps at each 10 seconds. When the temperature is D ºC
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
4rps
(1)
(3)
(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
8rps
(2)
(1)
8rps
(2)
0rps
C
D
Unit : ºC
D
61
61
59
C
D
22
25
25
28

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