Haier AC122ACERA [335/408] Electric control functions

Haier AC182ACERA [335/408] Electric control functions
1.3.8 Modify the EEV angle according to the discharging temp. Td
If the upper limitation of open range reachs 470, stop add the tolerance. Within 10 minutes after
compressor starts up, it will not modify. The detecting period is 2 miunites.
Cooling mode Modification angle
103ć discharging temp.
+5 degree/2 miunites, it will stop until up to the max. permitted
opening angle +50
90ć discharging temp.=103ć
Keep the angle
=90ć
-1 degree/2 miunites, and reduce to 0 degree gradually
Heating mode Modification angle
102ć discharging temp.
+5 degree/2 miunites, it will stop until up to the max. permitted
opening angle +50
88ć discharging temp.=102ć
Keep the angle
=88ć
-1 degree/2 miunites, and reduce to 0 degree gradually
1.4 4-way valve control
z The 4-way valve control in defrosting: refer to the defrosting procedure.
z 4-way valve control in other modes:
In heating mode, 4-way valve will open in 15 seconds after compressor starts up. When compressor not
startup or in non-heating mode, 4-way valve will close to ensure the compressor has stopped for at least 2
minutes and 55 seconds.
compressor ON
OFF
4-way valve ON
OFF
15 seconds (E) 2 minutes and 55 seconds
1.5 Outdoor defrosting control
There are two defrost methods according to the different system. The outdoor dip-switch is used to realize
the defrost method change-over because of the same PCB for 3HP, 4HP, 5HP and 6HP unit. For the samll
outdoor unit such as AU362AHERA adopt the ordinary defrost method, that is stop unit and change to cooling
defrost, for the double fan system auch as AU48NAIERA, AU60NAIERA etc. adopt realtime bypass defrost,
that is some refrigerant is bypassed to condenser for defrosting in heating mode without stop the unit,
meanwhile ensure the heating progress of indoor unit. When there is a little frost on condenser, some
refrigerant is bypassed to condenser for defrosting to ensure the outdoor fan motor works in the small wind
resistance condition. The ordinary defrost method can also be used for the double fan system.
A. Ordinary defrost
In heating mode, defrosting temp. sensor Te will check the frosting condition of outdoor heat exchanger
and make defrosting control.
1.5.1 Tao˚15ć(E), not enter defrost;
1.5.2 In heating mode, if the compressor has run for 10 minutes (E) and run for 45 minutes in all, the system
will measure the defrosting temperature sensor Te(check the frosting condition of outdoor heat exchanger)
and outdoor ambient temp. sensor Tao, if the below condition can be met for continous 5 minutes, the unit will
enter defrosting operation:
a. 5ć(E)<Tao<15ć, Te<=-6ć(E);
Electric control functions
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