Daikin EWYQ230DAYN Сервис мануал онлайн [365/524] 403923

Daikin EWAQ180DAYN Сервис мануал онлайн [365/524] 403929
ESIE06-05 Functional Control for a Standalone Unit
Part 2 – Functional Description 2–139
3
2
4
5
1
If a and b conditions are both satisfied at the same time give priority to control a
(Discharge SH = Discharge thermistor
temperature - Saturated gas
temperature for high pressure)
Additional EVV
Functions
Adjust cool/heat function
After initializing process, if compressor starts up in cooling or heating mode, it goes to the specified
output (service/EEV menu) for electronic expansion value. After reaching the ADJUST
COOL/ADJUST HEAT EV Opening, it will go to normal superheat control.
Low ambient
condition function
Low ambient condition.
After initializing process, if the compressor starts up in heating mode and the ambient temperature is
below the COOL or HEAT AMB. CONST setpoint, it goes to the specified output for the electronic
expansion valve. After reaching above ADJUST COOL/HEAT EV opening, it will go to normal
superheat control.
FF control on comp.
capacity
Feed forward control for compressor loading/unloading. If the compressor load goes up or down, the
controller will change (open/close) the electronic expansion valve opening. Different values are used
in cooling or heating mode.
FF control or
ambient
Feed forward control on low ambient.
If the compressor load goes up or down AND the ambient temperature is below the COOL/HEAT AMB.
CONST setpoint, the controller will change the EEV opening.
Fan down/up
control
When the fan stage changes:
drastic change of high pressure will happen
drastic shortage/Excess of capacity for expansion valve occurs.
Therefore, an adjustment of the electric expansion valve opening will be done.
Low pressure
control
EVV low pressure control: when the LP drops below the setpoint, additional pulses will be given to the
electronic expansion valve to prevent that the circuit trips on LP safety.
Variable control condition
a If Discharge SH < 20°C, continuous for
3 minutes. Raise the target suction SH
with 0.5°
Judge when 1 compressor is satisfied
(Reset the timer then).
b If discharge SH > C, continuous for 3
minutes. Drop the target suction SH
with 0.5°
Judge when 1 compressor is satisfied
(Reset the timer then).

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