SiBE12-908
Control Specification
Function and Control
31
3.4
Controls at Mode Changing / Start-up
3.4.1
Preheating Operation
Outline
Operate the inverter in the open phase operation with the conditions including the preheating
command from the indoor, the outdoor air temperature and discharge pipe temperature.
Detail
Preheating ON Condition
When outdoor air temperature is below 10.5ºC and discharge pipe temperature is below
10.5ºC, inverter in open phase operation starts. (The power consumption of compressor
during preheating operation is 35 W.)
OFF Condition
When outdoor air temperature is higher than 12ºC or discharge pipe temperature is higher
than 12ºC, inverter in open phase operation stops.
3.4.2
Four Way Valve Switching
Outline
During the heating operation current must be conducted and during cooling and defrosting
current must not be conducted. In order to eliminate the switching sound (as the four way valve
coil switches from ON to OFF) when the heating is stopped, the delay switch of the four way
valve must be carried out after the operation stopped.
Detail
The OFF delay of four way valve
Energize the coil for 150 sec after unit operation is stopped.
3.4.3
Four Way Valve Operation Compensation
Outline
At the beginning of the operation as the four way valve is switched, acquire the differential
pressure required for activating the four way valve by having output the operating frequency,
which is more than a certain fixed frequency, for a certain fixed time.
Detail
Staring Conditions
1. When starting compressor for heating.
2. When the operating mode changes from the previous time.
3. When starting compressor for starting defrosting or resetting.
4. When starting compressor for the first time after the reset with the power is ON.
5. When starting compressor after operation stop by the cooling / heating mode change-over
malfunction.
Set the lower limit frequency to
Hz for 60 seconds with any conditions with 1 through 5
above.
3.4.4
3-Minute Standby
Prohibit to turn ON the compressor for 3 minutes after turning it off.
(Except when defrosting. )
40 class
50 class
Cooling
56Hz
40Hz
Heating
68Hz
54Hz
