Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 835 / 1106

FDC-HKX
833
(11) Cooling operation control at lower outdoor air temperature (down to –5˚C)
(a) This control starts 1 minute after starting compressor during cooling or dehumidifying operation, controls the outdoor fan at the
outdoor temperature (Tho-A) being below 22˚C and enables the cooling operation.
(b) Outdoor fan control
Outdoor fan tap
140 model 224,280 models
(c) In cases of 224 and 280 only, the low outdoor air cooling control is releases temporarily when the number of operating compres-
sors is changed (1 unit
→
2 unit) and the outdoor fan is operated in the Hi mode. The low outdoor air temperature cooling control
becomes effective 2 minutes later.
(12) Snow protection fan control
If J6 on the outdoor unit PCB is opened, the outdoor fans on the units which have been stopped with the total or error stop are
operated in the Hi mode once at every 10-minute while the outdoor temperature is lower than 3˚C.
(13) Forced heating/cooling operation
With this control, SW3-7 on the outdoor unit PCB is turned on and CnG (equipped with short circuit pin) is shorted or opened so
as to forcibly determine whether the indoor unit is operated for cooling or heating. If any operation mode other than the forcible
mode is commanded from the indoor unit, the mode unmatch message is displayed on the remote controller or others and the
operation enters in the blowing mode.
Note (1) SW-7 is at OFF and CnG is open at the shipping from factory.
• Control A
For 140 : OFF, 1 ~ 2 speed control ranges
For 224, 280 : OFF, 1 ~ 3 speed control ranges
• Control B
For 140 : 1 ~ 3 speed control ranges
For 224, 280 : 1 ~ 4 speed control ranges
Fan tap 3 speed 2 speed 1 speed OFF
FM
01
Hi Me Lo OFF
Fan tap 4 speed 3 speed 2 speed 1 speed OFF
FM
01
Hi Hi Me Lo OFF
FM ON OFF OFF OFF OFF
(External air temperature)
SW3-7 CnG Operation
OFF Open/short Normal operation
ON
Open Cooling
Short Heating
ON
OFF
Control A
Outdoor air temperature (˚C)
Control B
Outdoor fan control effective
Outdoor air temperature (˚C)
02
Disabled