Mitsubishi SRK10CES, Technical Handbook

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23
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(o) High pressure control
(i) Purpose:
Prevents anomalous high pressure operation during heating.
(ii) Detector: Indoor unit heat exchanger sensor (Th2)
(iii) Detail of operation:
Note (1) RPSmin: The lower one between the outdoor unit speed and the command speed
¡
Temperature list
A B C
RPSmin < 88 46 53.5 58.5
88 <
= RPSmin < 108
41 48.5 53.5
108 <
= RPSmin
36 43.5 48.5
Notes (1) When the indoor unit heat exchanger temperature is in the range of B~C ºC, the speed is reduced by 8 rps at each 20 seconds. When the temperature is C
ºC or over for 1 minute continuously, the inverter is stopped.
(2) When the indoor unit heat exchanger temperature is in the range of A~B ºC, if the inverter 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.
Unit : ºC
(Example) Fuzzy
Indoor unit heat exchanger temperature (˚C)
Lower limit
speed 35 rps
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
(p) Heating low outdoor temperature protective control
◆
< I >
(i) Operating conditions: When the outdoor air temperature sensor (Th5) is 4
°
C or lower continues for 30 seconds while
outdoor speed is other than 0rps.
(ii) Detail of operation: When the inverter command speed is less than 22rps, the speed is forcibly set at 22rps. However,
when the thermo becomes OFF, the speed is reduced to 0rps.
(iii) Reset condition: When the outdoor air temperature sensor (Th5) becomes 6
°
C or higher.
◆
< II >
(i) Operating conditions: When the outdoor air temperature sensor (Th5) is 0
°
C or lower continues for 5 minutes while
outdoor speed is other than 0rps.
(ii) Detail of operation:
Outdoor fan is stepped up by 1 speed step. (Upper limit 7th speed)
(iii) Reset condition: When the outdoor air temperature sensor (Th5) becomes 2
°
C or higher.
◆
< III >
(i) Operating conditions: When the outdoor unit is operating with the speed of other than 0rps, and when the outdoor heat
exchanger temperature (Th4) is less than -10
°
C for 1 minutes.
(ii) Detail of operation:
1
Outdoor air temperature <
= -7
°
C: The upper limit of inverter command speed is 60 rps.
2
Outdoor air temperature > -7
°
C: The upper limit of inverter command speed is 70 rps.
(iii) Reset conditions: When the either of the following conditions is satisfied
1
When the outdoor heat exchanger temperature (Th4) becomes -7
°
C or higher.
2 When the inverter command speed is 0rps.