Common Control - Daikin LXE10E-A14 Service Manual

https://daikin-p.ru

2.5.4 Common control

The following are controlled in different operation modes. (For the details, refer to the following pages.)
Control name
A Compressor ON/OFF control
B Starting control
C Evaporator fan speed control
D Superheat control
E High-pressure control
F Injection
G In-range control
H In-range masking control
I Capacity control
J Charging and releasing control
K Pump down control
L Economizer control
M Dehumidification (optional)
N Bulb mode (optional)
Control content
The compressor is operated on and off to
adjust the inside temperature.
At the start of the operation with low ambient
temperature,an oil temperature raising control is executed.
When a protection device activates at the operation
start, a high pressure/current control is executed.
The evaporator fan is switched to the high or low
speed according to the set point temperature.
In order to keep the superheat of the evaporator
optimum,the opening of the electronic expansion
valve is controlled.
In order to keep the high pressure optimum, the
opening of the electronic expansion valve is controlled.
In order to prevent the refrigerant oil from
deteriorating, the injection solenoid valve control or
electronic expansion valve control is carried out.
When the control temperature is within SP ±2˚C,
the in-range lamp is turned on.
After defrosting initiation, the in-range lamp
is kept on for 90 minutes.
The circulating flow rate of refrigerant is proportionally
controlled with suction modulating valve to keep the
control temperature variation within ±0.5˚C.
These functions control the heating capacity
for defrosting and heating operation.
The liquid refrigerant is collected into the liquid receiver
(water cooled condenser).
The economizer circuit is controlled to enhance
cooling capacity.
The unit can execute dehumidification by
reheat coil and humidity sensor.
For flower bulb transportation, the unit is
equipped with bulb mode control.
2-16
Operation mode
Partial
Frozen Chilled Defrost
frozen