SiUS04-702
Control Specification (09/12 Class)
Function and Control
37
3.3
Controls at Mode Changing / Start-up
3.3.1 Preheating Operation
Outline
Operate the inverter in the open phase operation with the conditions including the preheating
command from the discharge pipe temperature.
Detail
Preheating ON Condition
When the discharge pipe temperature is below 50ºF, inverter in open phase operation starts.
(The power consumption of compressor during preheat operation is 35 W.)
OFF Condition
When the discharge pipe temperature is higher than 54ºF, inverter in open phase operation
stops.
3.3.2 Four Way Valve Switching
Outline
Heat Pump Only
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 160 sec after unit operation is stopped.
3.3.3
Four Way Valve Operation Compensation
Outline
Heat Pump Only
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
Starting Conditions
1. When starting compressor for heating.
2. When the operating mode changes to cooling from heating.
3. When starting compressor for rushing defrosting or resetting.
4. When starting compressor for the first time after the reset with the power is ON.
5. When starting compressor for heating next to the suspension of defrosting.
6. When starting compressor next to the fault of switching over cooling / heating.
Set the lower limit frequency to 68 (model by model) Hz for 45 seconds with any conditions 1
through 6 above.
Содержание FTXS09DVJU
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Страница 191: ...Check SiUS04 702 180 Service Diagnosis...
Страница 247: ...RX09 12FVJU SiUS04 702 236 Removal Procedure When reassembling make sure to fit the hook Step Procedure Points...
Страница 254: ...SiUS04 702 RX09 12FVJU Removal Procedure 243 5 Pull the sound blanket bottom out Step Procedure Points...
Страница 259: ...RX09 12FVJU SiUS04 702 248 Removal Procedure 4 Lift the compressor up and remove it Step Procedure Points...
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