- -
57
1) When indoor coil temperature is lower than 5
℃
，
go back to initial action, when this do not meet, the unit
continue. When the fan stops in the beginning time of heat mode or working in low air speed more than 30 minutes,
it will indicates trouble of outdoor, and all relay turn off.
2) When outdoor unit trouble inspection is not asked,
4.2
The compressor control
:
4.2.1 Compressor 3 minutes protection: the same as cooling mode
4.2.2 The compressor runs when Ta is lower than Ts, when Ta is equal or higher than Ts, the compressor stops.
4.2.3 When in inspection function, the compressor stops.
4.2.4 Over heat protection:
Start-up condition: when the compressor have been in working for 2 minutes, if indoor coil temperature is equal
or higher than 70
℃
, over heat protection runs.
Over heat protection: the compressor stops for 6 minutes, indoor fan works in super low flow mode, then restart,
indoor fan works in low flow mode, if within 10 minutes, the indoor coil temperature is equal or higher than 70
℃
again, the unit shuts down and indicator trouble.
4.3 Indoor fan control
:
indoor fan is control by set temperature, room temperature and indoor coil temperature.
Action of indoor fan:
1) When room coil temperature is lower than 26
℃
, indoor fan don't run.
2) When room coil temperature is lower than 35
℃
, indoor fan works in weak flow for 5 minutes, low air flow for 2
minutes, and then works as the set air speed.
3) When room coil temperature is equal or higher than 35
℃
, indoor fan works in low air flow for 2 minutes, and
then works as the set air speed.
Heating period after the running of the fan: (Tc = indoor coil temperature Ta = room temperature)
When the difference of Tc and Ta reduce from
≥
5
℃
to -5
℃＜
Tc-Ta
＜
5
℃
, the fan remain the pre air flow, if
the air speed change, the air flow can only be reduced, the electricity heat shuts down.
1) When 0
＜
Tc-Ta
＜
3
℃
, electrical heater shuts down for more than 1 minute, indoor fan stops, otherwise the
fan speed changes to low flow.
2) When Tc -Ta
≤
0
℃
, indoor fan stops.
3) When Tc -Ta
≤
-5
℃
, goes into dehumidifying mode.
When Tc – Ta
≥
5
℃
again, if the fan is in static state, it goes into heat starting process, if the fan is in
working, and the electrical heater shuts down not more than 1 minute in -5
℃＜
Tc-Ta
＜
5
℃
, the fan speed
don't change, if it is changed, it can only be reduced. In other conditions, the fan speed works as set air
speed.
4.4 Swing louver control
: working action is the same as in cooling mode.
4.5 Electrical heater control
:
Start–up conditions: (all following conditions meet)
Tc - Ta
≥
5
℃
; Ts – Ta
≤
3
℃
; Ta
≤
23
℃
; indoor coil temperature
≤
55
℃
; electrical heater have been shut down
for 1 minute in -5
℃＜
Tc-Ta
＜
5
℃
, and not in hot starting process, electrical heater can still run.
Stop conditions: (one of following condiiton)
Tc - Ta
≤
5
℃
; Ta = Ts; Ta
≥
26
℃
; Tc
≥
60
℃
.
4.6 Clear spare heat function
:
After the electrical heater’s shutting down, indoor fan works in low flow for 30 seconds, and then stops.
4.7 Dehumidifying control
: (see outdoor unit control)
