SiME332106E
Startup Control
Part 4 Functions and Control
53
4. 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.
To avoid stresses to the compressor due to oil return or else after the startup, the following
control is made and the position of the four way valve is also determined.
Pc : High pressure sensor detection value
Pe : Low pressure sensor detection value
Ta : Outdoor air temperature
Te : Low pressure equivalent saturation temperature
Td : Discharge temperature
4.1 Cooling Startup Control
4.2 Heating Startup Control
0 Hz
0 pulse
480 pulse (fully open)
Step4
Te < 10°C
Te < Th2(
) – 10
&
INV
20 rps
Pc – Pe
0.42 MPa
&
INV > 20 rps
Pc – Pe
0.32 MPa
&
OR
Ta < 20°C: OFF
Ta
20°C: Step4
0 pulse
Frequency step up
5 sec. interval
+1step/15 sec. (Pc > 2.16 MPa)
–1step/15 sec. (Pc < 1.77 MPa)
Compressor (M1C)
Electronic expansion
valve (Main)
(Y1E)
0 pulse
480 pulse (fully open)
Electronic expansion
valve (Refrigerant jacket)
(Y3E)
Electronic expansion
valve (Injection)
(Y2E)
Inverter fan (M1F)
Th2 in "Pre-pressure
equalization"
0 Hz
Min.
step
15 sec.
Normal control
0 pulse
Step 4
Step 7Y
OR &
T (Ta – Te) control
45 sec. elapsed
10 sec. elapsed
Inverter frequency matched
Compressor (M1C)
Electronic expansion
valve (main) (Y1E)
Fan motor (M1F)
+15 Hz/20 sec.
OR &
15 min. elapsed
Four way valve ON
Td – Te > 10°C
