HISEER AS10/LF, Руководство по эксплуатации, установке и обслуживанию

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38
Service Guide
The pump PWM running control (Y3)
On cooling mode, when compressor is on, pump PWM
runs as EV05 for 3 minutes, then runs with
(
Inlet
temperature-Outlet temperature
)
=EV03 as target via
PID control . when compressor is off, pump PWM runs
as EV06.
On heating mode, when compressor is on, pump PWM
runs as EV05 for 3 minutes, then runs with
(
outlet
temperature - Inlet temperature
)
=EV04 as target via
PID control
；
when compressor is off, pump PWM runs
as EV06.
On DHW mode, pump PWM runs as EV05. After DHW
temperature reaches preset temperature, if the unit does
not need to do cooling or heating, pump PWM is off.
pump PWM runs as EV05 on defrosting.
As other situation, when pump is on, PWM is EV06,
PWM is off when pump is off.
Pump PWM will starts running for 3 minutes when
pump is off for 24 hours to avoid seizure
Defrosting control
The unit is equipped with hot gas defrosting. When
the conditions of defrosting are met, the fan stops, the
4 way valve changes direction and the hot gas flows
out to the finned coil heat exchanger instead. After the
condition to exit defrosting is met, 4 way valve change
gas flow direction ,the fan starts, the hot gas flows into
brazed plate heat exchanger and the unit returns to
normal operation.
Defrosting starting conditions (all must
be met)
1. Ambient temperature B3
＜
DF03
2. The unit running time after previous defrosting
＞
DF06
3. Ambient temp. B3 minus LPS B11
＞
DF04, last
DF05 time
4.
LPS B11
≤
DF12.
Defrosting exit condition ( any of the following
condition is met)
1. HPS B12 ≥ DF09 ,last 10 seconds.
2. Defrost time ≥ DF10
4. Temperature sensor B1, B2,B6 ,B11 or B12 trouble.