34
a. Control of outdoor unit
No.
Item Specification
1
Capacity control
(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.
2
Fan control
(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)
3
Cooling by-pass
control
(1) Judge the overheating of cooling cycle, make proper amount of liquid enter into
the by-pass loop.
4
Defrosting control
(1) Detect the temperature of heat exchanger and conduct defrosting running.
5
Refrigerant and
oil recovery
control
(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.
b. Function of each part
No.
Item Specification
1
Exhaust temperature
sensor Td
Suction temperature
sensor Ts
Check the overheating of cooling cycle, use PMV to control cooling by-pass.
2
Pressure sensor
High pressure Pd
Low pressure Ps
Control running capacity
Control revolution of outdoor fan
Conduct protection control according to the pressure
Control the by-pas of two-way solenoid
3
Heat exchanger
Temperature sensor TE
Detect the temperature of heat exchanger, conduct defrosting control
4
Solenoid valve (SV1)
When running, act when high pressure is too high (6HP)
5
Solenoid valve (SV2)
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 (6HP and 10HP)
6
Solenoid valve (SV4)
Act before commercial compressor is started (10HP)
7
High pressure switch
Act when high pressure reaches 2.94 MPa to stop running
8
PMV
Detect the temperature according to the exhaust temperature sensor and suction
temperature sensor to make the refrigerant enter into the by-pass.
Все каталоги и инструкции здесь: http://splitoff.ru/tehn-doc.html
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