Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 199

3) Operation of function component in defrosting
Outdoor unit speed
Outdoor unit fan
4-way valve
Electronic expansion valve
EEVA,B
(Operating unit)
Electronic expansion valve
EEVA,B
(Stopped unit)
Start of defrost operation
4) Conditions for finishing defrosting
When any of the following conditions is met, the defrosting finishing operation will start.
1 When the temperature of the outdoor heat exchanger thermistor (Tho-R) is 9 °C or more.
2 When 10 minutes has passed after the start of defrosting.
(8) Determining the operating mode
The cooling and heating operating modes are the remote control switch mode that have been previously determined.
If a mode differing from these is selected after this, the selected mode will appear in the display of the remote control, but only the
fan will operate.
First operation
Example
Selected Mode Remote Control Display
1
Cooling Cooling
2 Heating
Heating
Example of operating pattern
Cooling
switch
A unit
ON
Heating
B unit switch
ON
Operation Operation
80 rps
Decision speed
0 rps
According to rps
OFF
ON
OFF
When 2 units are operating:
150 pulse
When 1 unit is operating:
200 pulse
EEV control
Opening in
relation to
conditions
Fully closed
Defrost operation
80 sec.
Second operation
Operation Selected Mode Remote Control Display
Cooling Heating
Heating Cooling
Cooling
Cooling
Fan
switch
ON
Operation Operation
Decision speed
200 pulse
Calculated start
Opening in relation
to conditions
Defrost end operation
80 sec.
Defrost end conditions
Notes
Operation
(1)
Heating Fan
• Different mode is
only fan operation.
Cooling Fan
Heating
switch Fan Heating
ON
Heating
Cooling
switch
Operation
SCM-HG (2 room)
Notes (1) Indoor unit fan is
in response to Hot
Keep.
(2) Outdoor unit fan
starts 6 seconds af-
ter the start of the
compressor.
Note (1) If the display shows
heating and the opera-
tion is fan, Hot Keep
will operate.
Heating
ON
Note (1) [ ] indicates current operation.
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