Haier AU96NFTAHA Service Manual page 37

a. Control of outdoor unit
No. Item
Capacity control
1
Fan control
2
Cooling by-pass
3
control
4
Defrosting control
Refrigerant and
oil recovery
5
control
b. Function of each part
No. Item
Exhaust temperature
sensor Td
1
Suction temperature
sensor Ts
Pressure sensor
High pressure Pd
2
Low pressure Ps
Heat exchanger
3
Temperature sensor TE
Solenoid valve (SV1)
4
Solenoid valve (SV2)
5
Solenoid valve (SV4)
6
High pressure switch
7
PMV
8
(1) Conduct comprehensive calculation for running demand from indoor unit group
to determine the running capacity;
(2) Make running capacity change according to the demand of excess or insufficient
capacity given by indoor unit group;
(3) Make running capacity change according to pressure, temperature.
(1) When cool, make fan speed of outdoor unit have corresponding change according
to the change of high pressure
(10HP: 2 combinations, Grade 6; 6HP: Grade 3)
(1) Judge the overheating of cooling cycle, make proper amount of liquid enter into
the by-pass loop.
(1) Detect the temperature of heat exchanger and conduct defrosting running.
(1) Regularly conduct control of refrigerant and oil recovery for some indoor unit
groups not running; during recovery control, the refrigerant will flow in all
indoor unit groups and the running frequency will also change.
Check the overheating of cooling cycle, use PMV to control cooling by-pass.
Control running capacity
Control revolution of outdoor fan
Conduct protection control according to the pressure
Control the by-pas of two-way solenoid
Detect the temperature of heat exchanger, conduct defrosting control
When running, act when high pressure is too high (6HP)
When cool, act when high pressure is too low
When heat, act when the fixed frequency compressor is started
When stop, act when the difference between high pressure and low
pressure is too large
Act before commercial compressor is started (10HP)
Act when high pressure reaches 2.94 MPa to stop running
Detect the temperature according to the exhaust temperature sensor and suction
temperature sensor to make the refrigerant enter into the by-pass.
34
Specification
Specification
(6HP and 10HP)
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