MAXA BDS28A, Техническое руководство

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7.2.2 Dehumidifying mode
7.2.2.1 The condition and process of dehumidifying
If T
amb.
> T
preset
, DRY mode will act, the indoor fan, outdoor fan and compressor will run, and indoor fan will run at low
speed.
If T
set
- 2°C ≤ T
ambient
≤ T
preset
, the unit will keep running in the original mode.
If T
am.
≤ T
set
- 2°C, the compressor will stop running, the outdoor fan will delay 30 seconds to stop and the indoor fan will
run at low speed.
7.2.2.2 Protection function
Protection is the same as that under COOL mode.
7.2.3 HEAT mode
7.2.3.1 The condition and process of heating
If T
amb
≤ T
prset
+ 2°C, HEAT mode will act, the compressor, outdoor fan and reversal valve will run, the indoor fan will delay
3min to stop at the latest.
If T
prset
+2°C < T
amb
< T
prset
+ 5°C, the unit will keep running in the original mode.
If T
amb
> T
prset
+ 5°C, the compressor will stop, the outdoor fan will delay 30 sec to stop and Indoor unit fan blow with low
speed for 60s,during this period, fan speed is not changeable.
● In this mode, the temperature setting range is 16°C ~ 30°C.
The air conditioner will adjust the running frequency of the compressor automatically according to the change of ambient
temperature.
● When the unit is turned off in HEAT mode, or switched to other mode from HEAT mode, the four –way valve will be
powered off after the compressor stops.
Stop heating
Original running state
Start heating
Compressor
Outdoor Unit
Indoor Unit
Reversal valve
6min 3min 6min
3min
Set fan speed
3min
Run
T
amb
60s
30s 30s
60s
Stop
7.2.3.2 The condition and process of defrosting
When frost is detected in the condenser, the system will enter into defrosting state. When defrosting starts, the compressor
and indoor fan will stop, and the outdoor fan and four-way valve will delay 30 seconds to stop. The compressor will start
after 15 seconds and then defrosting will be started. When the compressor has run for 7 minutes or defrosting is finished,
the compressor will stop. After 30 seconds the four – way valve opens and after an other 60 seconds, the compressor and
outdoor fan resume running. The indoor fan will delay 3 minutes to run at the la test and temperature on the display panel
shows H1 .
Four-way valve
Compressor
Outdoor Unit
Indoor Unit
Run Stop
7min
The period of defrosting
3min Set fan speed