Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 136

SCM-HG (4 room)
(b) Mode switching
Within the selected mode, the unit operates using the values shown below which were obtained by multiplying a conversion
coefficient to the indoor unit demand frequency.
Model (Indoor)
Operation Mode
Automatic
High
Medium
Low
Hi power
Econo
Note (1) The values in parenthesis ( ) indicate SRRM40HENG-L.
(c) Operation of Major Functional Components in Heating Mode
Operation
Functional
components
Demand frequency See preceding table
Fixed
According to mode switching
Indoor
unit fan
Automatic According to demand frequency
Outdoor unit fan According to decision frequency
Solenoid Valve
(SVA, B, C, D)
Electronic According to decision
expansion valve frequency
Compressor
(d) Hot Standby (When any of the following conditions is met, Hot Standby operation is activated.)
(i) Operating conditions
1 The power supply is ON.
2 Under the following conditions.
When the temperature detected by the outdoor air temperature sensor is at the ON
a
level as shown in the figure, and when 30 continuous minutes have passed since
the decision frequency has become 0 Hz after cooling or heating has been stopped.
When 20 minutes have passed since the power was turned on and the outdoor air temperature thermistor is in the
b
ON range.
(ii) Function
Low voltage is applied from the inverter to the compressor to preheat it. This melts and vaporizes refrigerant that has frozen
inside the freezer oil, making it easier for the refrigerant to circulate when the heating operation is started. This makes the
start of the heating operation faster.
(iii) Finishing conditions
1 When Hot Standby has been activated after the power has been turned on.
a When 20 minutes have passed since the power was turned on and the outdoor air temperature thermistor is in the
OFF range.
When the operating mode has been switched from stop to heating or cooling.
b
2 When operating under item (i) 2 .
When the outdoor air temperature thermistor is in the OFF range.
a
When the operating mode has been switched from stop to heating or cooling.
b
134
22 25
28 28
28 28
28 28
28 28
40 34
28 28
Thermostat OFF
Heating
(All indoor units)
0
(All indoor units)
Hot Keep
Hot Keep
OFF
ON According to stop mode
According to stop mode
ON OFF
28 32
28 ~ 40 28 ~ 42
28 ~ 40 28 ~ 42
28 28 ~ 30 28 ~ 42 (28 ~ 38)
28 28
40 40
28 28
Thermostat OFF Fan, stop, abnormal stop
(Some of indoor units) (Some of indoor units)
0
(Thermostat off units) (Fan, stop, abnormal stop units)
According to mode switching
According to demand frequency
According to decision frequency
OFF OFF
(Thermostat off units) (Fan, stop, abnormal stop units)
75 Pulses All closed
(Thermostat off units) (Fan, stop, abnormal stop units)
ON ON
40 50
28 ~ 46 28 ~ 80
28 ~ 46 28 ~ 80
28 ~ 61
28 34
42 (46) 80
28 28
Failure
(Outdoor Unit)
0 0
(All units)
Hot Keep
Hot Keep
OFF
According to stop mode
According to stop mode
OFF
ON
OFF
22°C 24°C
Outdoor air temperature