Vaillant V 12-025 HWI Training Manual page 40

9 PCB Explanation
9. The frosting protection of indoor evaporator:
After the compressor runs for 3 minutes, the
compressor, indoor fan and swaying wind stop
running if the temperature of the indoor coil keeps
no higher than -10 ºC within 3 minutes(The
programming data is 1E#).The compressor will be
restarted 6 minutes later. If the above phenomenal
occurs again within 6 minutes, the controller will cut
off all outputs of the system. The display screen
shows the temperature as "E8"which means the
frosting protection.
Dehumidification mode:
1. The range of the setting temperature: the default
value is 25ºC and it cannot be reset
2. Compressor working condition:
In the dehumidification mode, the indoor fan will runs
for 20ºC seconds with low speed and then the
working condition of the compressor is depended on
the indoor temperature which should be checked
every period.
• If Tr is no lower than 23ºC, both the indoor fan and
outdoor fan will runs for 7 minutes first and then
keeps idle for 5 minutes and goes round and round
like this.
• If Tr is lower than 23ºC, both the indoor fan and
outdoor fan will runs for 5 minutes first and then
keeps idle for 7 minutes and goes round and round
like this.
• If Tr is no higher than 10ºC, except the indoor fan
and the display screen, all equipment of the system
are not allowed to run.
3. Outdoor fan working condition: In the dehumidification
mode, the outdoor fan keeps running!
4. Indoor fan working condition: In the dehumidification
mode, the indoor fan runs at the low speed which
cannot be adjusted.
5. Four-way valve working condition:
The four-way valve is always closed in the
dehumidification mode
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6. The working condition of outdoor air door
The position of the air door is at 42° and cannot be
adjusted;
7. There is no high-power function in the
dehumidification mode.
Heating mode:
1. The range of setting temperature: 16ºC - 32ºC
2. Compressor working condition:
In the heating operation mode, the temperature
curve of the compressor is as below:
3. Outdoor fan working condition:
• Without overloading, the outdoor fan keeps running!
• When overloading, the working condition of the
outdoor fan will change with the change of the
indoor coil Tp, the curve of which is: (The critical
temperatures of overloading separately are the
programming data 25# and 24# and the default
values 56ºC and 52ºC)
4. Indoor fan working condition:
• There are four working conditions for indoor fan in
heating mode: High wind operation, mid wind
operation, low operation and automatic wind
operation.
• In the heating mode: the relationship curve of
indoor fan and the temperature of indoor coil Tp is
as the following
Split Type Installation Manual