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Outdoor Unit Control - Haier AU042FPERA Service Manual

Mrv s" series (4-6hp)
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14. Outdoor Unit Control

1. Compressor startup control
After receiving the outdoor startup instruction, outdoor open SV1 30 seconds and then standby. When startup, the
compressor will keep for 3 min at 45rps (when Ta<40°C) or 3 min at 40rps (when Ta>=40°C). In cooling mode, meet
running 1min & (Td-CT)≥20°C or Ps≤0.1MPa (or max. running time is 3min),quite the startup control;
In heating mode, meet running 1min and & (Td-CT)≥20°C or Ps≤0.1MPa (or max. running time is 3min), quite the
startup control;
During startup, the high pressure protection, high exhaust protection and current protection is priority and the low
exhaust up frequency protection is shielded.
2. Compressor output control
Compressor Pd/Ps control, control the compressor frequency to output appropriate cooling/heating capacity.
The control at the end of the startup control.
2.1 In cooling mode:
According to the ambient temperature select target Ps automatically
Effect priority mode
Mode
Target Ps
Setting value -R°C
Target Ps (set by dip
switch)
Target Ps
Setting value +2°C
R value setting: Ta<-5°C, Target Ps: setting value -8°C
-5°C≤Ta<12°C, Target Ps is the slope value of setting value and (setting value -8°C)
2.2 In heating mode:
According to the piping length to select target Pd and also according to the ambient temperature select target Pd
automatically
Effect priority mode
Mode
Target Pd
Setting value +3°C
Target Pd
Setting value +2°C
Target Pd
(set by dip switch)
Target Pd
3. Outdoor fan motor control
3.1 In cooling mode:
Outdoor fan motor running control during cooling mode is in high COP and 100% RPM running as much as
possible.
Outdoor fan control in the operation of the refrigeration in the relation between high COP operation principle is to
100% as much as possible the RPM.
Pd is the main control standard.
Energy-saving mode
(default)
Setting value -R°C
0
Setting value +2°C
Energy-saving mode
(default)
Setting value +3°C
Setting value +2°C
48
Setting value -2°C
Setting value -2°C
Outdoor ambient
temperature
Ta≤12°C
2
12°C<Ta<40°C
Ta≥40°C
Outdoor ambient
temperature
Ta≥15°C
Ta≥7°C
46
Ta≥-5°C
Ta<-5°C
37
Ps correction
during running
During running:
correct the Ps
according to the
compression ratio
Pd correction during
running
During running:
correct the Pd
according to the
compression ratio

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