Dehumidifying Mode; Heating Mode - Midea MSR1-09HRN1-QC2 Service Manual

Anti-freezing control to indoor evaporator at cooling mode ( T: evaporator temp. )
EVAP. temp. down
Compressor and outdoor
8.6

Dehumidifying mode

8.6.1 The 4-way valve is off in dehumidifying mode
8.6.2 Compressor and Indoor Fan actions in dehumidifying mode
Indoor
Block
Fan
LOW
A
BREEZE OFF 4minutes
LOW
B
BREEZE OFF 5minutes
LOW
C
BREEZE OFF 6minutes
Repeat on and off cycle.
8.6.3 Low room temperature protection:
When room temperature decreases to below 10 , compressor and outdoor fan will stop(indoor fan is Breeze).
Dehumidifying operation will be resumed when room temperature restores to over 13 .
8.6.4 At dehumidifying mode, the anti-freezing function of the indoor heat exchanger is the same as that of
cooling mode.
8.6.5 At dehumidifying mode, the action of fans of indoor is the same as that of air-only mode.
8.7

Heating mode

8.7.1 Generally, the 4-way valve is open in heating mode, but it is closed in defrosting mode. 4-way valve must
delay 2 minutes compared with compressor if the compressor changed into non-heating mode or turned off.
4-way valve doesn't delay in dehumidifying mode
8.7.2 Generally, the outdoor fan is turned off with the on-off action of compressor in heating mode, except for
the defrosting mode or the end of defrost
8.7.3 Action of compressor and outdoor fan motor at heating mode: compressor must run for 7 minutes after
starting and then judge temperature. Meanwhile other protections are still valid.
18
fan off (after 5 mins)
TE5
C
0
Compressor and Outdoor Fan
ON 6minutes
ON 5minutes
ON 4minutes
Service manual
Compressor and
outdoor fan on
TE6
B A
2
EVAP. temp. up
T
TA-TS