Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 30

SRK-GZ
(k) High pressure control
(i) Purpose: Prevents abnormally high pressure operation during heating.
(ii) Detector: Indoor unit heat exchanger thermistor (Th2)
(iii) Detail of operation: (Example) Fuzzy
Notes (1) When the indoor unit heat exchanger temperature is in the range of 55 - 65(63)ºC, the frequency is reduced by 8 Hz (8 rps) at each
20 seconds.
(2) When the indoor unit heat exchanger temperature is in the range of 47.5(49.5) - 55ºC, if the inverter command frequency is been
maintained and the operation has continued for more than 6 minutes at the same frequency, 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
frequency.
(4) value in ( ) indicates 50 model.
(l) Stop mode
(i) Operating conditions: When the operation mode is changed, when the dehumidifying operation is changed from
the heating oriented mode to the cooling oriented mode or vice versa, or when the inverter frequency turns to 0 Hz.
[When 0 Hz is commanded from the indoor unit controller, when an outdoor protective function is actuated]
(ii) Detail of operation
S SRK25GZ-L1, 35GZ-L1
Function Operation
(Command
Inverter
frequency)
frequency
0
(Frequency
Indoor
dependent)
fan
OFF
ON
Indoor
power
OFF
relay
ON
Outdoor
fan
OFF
ON
4-way
valve
OFF
Note (1) When the start delay of compressor of indoor unit controller is actuated and the operation is reset, it takes 2 minutes and 55 seconds.
28
After lapse of 6 min. or over
After lapse of 6 min. or over
After lapse of 6 min. or over
47.5
Indoor unit heat exchanger temperature (˚C)
(49.5)
When stopped by indoor unit controller
Heating, heating Cooling, cooling
oriented dehumidifying oriented dehumidifying
(1)
3 min.
10 sec.
2 min.
2 min.
Stop Full stop Stop
(0 Hz command) (0 Hz command)
8 Hz (8 rps)
(3)
(4)
(3)
Lower limit
(3)
frequency 34 Hz
(30 rps)
55
65
(63)
When stopped or reset by outdoor unit protective function
Heating, heating
oriented dehumidifying
2 min.
(1)
3 min.
55 sec.
Hot keep
10 sec. 10 sec.
2 min.
Full stop Stop Restart
(0 Hz command)
(1),
8 Hz (8 rps)
0 Hz
Cooling, cooling
oriented dehumidifying
2 min.
55 sec.
10 sec.
2 min.
Stop Restart
(0 Hz command)