Special Control SiBE18-821_C
82 Function
3. Special Control
3.1 Startup Control
This control is used to equalize the pressure in the front and back of the compressor prior to the
startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON
to charge the capacitor.
In addition, to avoid stresses to the compressor due to oil return operation or else after the
startup, the following control is made and the position of the four way valve is also determined.
To position the four way valve, the master and slave units simultaneously start up.
3.1.1 Startup Control in Cooling Operation
3.1.2 Startup Control in Heating Operation
Thermostat ON
Pressure equalization control
prior to startup
Startup control
STEP 1 STEP 2
Compressor 0 Hz 57 Hz Unload
57 Hz Unload
+2 steps / 20 sec.
(until Pc – Pe > 0.39 MPa is achieved)
Outdoor fan STEP 7
Ta < 20°C: OFF
Ta ≥ 20°C: STEP
4
+1 step / 15 sec. (when Pc > 2.16 MPa)
–1 step / 15 sec. (when Pc < 1.77 MPa)
Four way valve (Y1S) Holds OFF OFF
Main electronic expansion
valve (Y1E)
0 pls 480 pls 480 pls
Subcooling electronic
expansion valve (Y3E)
0 pls 0 pls 0 pls
Hot gas bypass valve (Y2S) OFF
OFF OFF
Ending conditions
• Pc – Pe < 0.3 MPa
• A lapse of 1 to 5 min.
A lapse of 10 sec.
• A lapse of 130 sec.
• Pc – Pe > 0.39 MPa
or
or
Thermostat ON
Pressure equalization control
prior to startup
Startup control
STEP 1 STEP 2
Compressor 0 Hz 57 Hz Unload
57 Hz Unload
+2 steps / 20 sec.
(until Pc – Pe > 0.39 MPa is achieved)
Outdoor fan
From starting
~ 1 min. : STEP 7
1 ~ 3 min. : STEP 3
3 ~ 5 min. : OFF
STEP 8 STEP 8
Four way valve (Y1S) Holds ON ON
Main electronic expansion
valve (Y1E)
0 pls 0 pls 0 pls
Subcooling electronic
expansion valve (Y3E)
0 pls 0 pls 0 pls
Hot gas bypass valve (Y2S) OFF OFF OFF
Ending conditions
• Pc – Pe < 0.3 MPa
• A lapse of 1 to 5 min.
A lapse of 10 sec.
• A lapse of 130 sec.
• Pc > 2.70 MPa
• Pc – Pe > 0.39 MPa
or
or
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