Mitsubishi Heavy Industries SRRM25ZF-S, Technical Manual, Page: 61 / 127

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59
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(3) Dew condensation prevention control for the cooling and dehumidifying operation
(STM, SRRM type only)
⽧
< I >
(a) Operation condition: During cooling or dehumidifying operation, 20 minutes elapsed after starting (with indoor command
speed something other than 0 rps), under the following conditions.
1) When the fan speed is set to “AUTO” or “HI”, or operation mode is set to “HI POWER”
(b) Detail of operation:
The upper limit of the indoor command speed is set to the maximum number of revolutions at fan
speed “MED”.
(c) Rest conditions: Any one of the following conditions.
1) Fan speed set to anything other than “AUTO” or “HI”, or operation mode set to something other than “HI POWER”
2) 50 minutes elapsed after starting (with indoor command speed something other than 0 rps)
3) When indoor command speed is set to 0 rps
⽧
< II >
(a) Operation condition:
During cooling or dehumidifying operation after starting (with indoor command speed set to some-
thing other than 0 rps), and all of the following conditions are satisfied.
1) When fan speed set to “AUTO” or “HI”, or operation mode to “HI POWER”.
2) When the indoor heat exchanger temp.(Th
I
-R
1
) rises 5˚C or more relative to the lowest temperature within the first 3
minutes of operation.
(b) Detail of operation:
The upper limit of the indoor command speed is set to the maximum number of revolutions at fan
speed “MED”.
(c) Rest conditions:
Any one of the following conditions.
1) Fan speed set to anything other than “AUTO” or “HI”, or operation mode set to anything other than “HI POWER”
2) 30 minutes elapsed after this command starts
3) Indoor command speed set to 0 rps
(4) High pressure control
(a) Purpose:
Prevents abnormally high pressure operation during heating.
(b) Detector: Indoor unit heat exchanger sensor (Th
I
-R
1
)
(c) Detail of operation:
Notes (1) When the indoor unit heat exchanger temperature is in the range of B~C
°
C, the indoor command speed is reduced by 8 rps at each 20 seconds.
When the temperature is C
°
C or over for 1 minute continuously, the compressor is stopped.
(2) When the indoor unit heat exchanger temperature is in the range of A~B
°
C, if the indoor command speed is been maintained and the operation has
continued for more than 20 seconds at the same speed, it returns to the normal heating operation.
(3) Indoor blower retains the fan tap when it enters in the high pressure control. Outdoor blower is operated in accordance with the speed.
(4) 22~35 type: 20 rps. 50~60 type: 35 rps
¡
Temperature list
A B C
Th
I
-A <
= 24
48.5 56 62
24 < Th
I
-A <
= 27
47.5 53 61
27 < Th
I
-A 46.5 50 60
Unit :
°
C
(Example) Fuzzy
Indoor unit heat exchanger temperature (˚C)
Lower limit (4)
After lapse of 20 Sec. or over (2)
After lapse of 20 Sec. or over
(2)
After lapse of 20 Sec. or over
(2)
B C
8 rps (1)
8 rps
0 rps
A