Specifications

SiBE341027 Detailed Control Functions
Function 45
2.3 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. Start both the master and the slave units
simultaneously to position the four way valve.
(1) Startup Control in Cooling Operation
(2) Startup Control in Heating Operation
[Ending conditions]
OR
· A lapse of 130 sec.
· Tc > 48˚C
· Pe < 0.54Pa
· Pc-Pe > 0.4MPa.
0 Hz
0 pls
Step 4
52 Hz
0 pls
10 sec.
Ta < 20˚C : OFF
Ta ≥ 20˚C : Step 4
+1 Step / 15 sec. (when Pc > 2.2 MPa)
-1 Step / 15 sec. (when Pc < 1.8 MPa)
+2 Step / 20 sec.
480 pls
Thermo. ON: Initial opening
Ta: Outdoor air temperature
Tc: High pressure equivalent
saturation temperature
Pc: Value detected by high
pressure sensor
Pe: Value detected by low
pressure sensor
Inverter compressor (INV.)
(M1C)
Electronic expansion valve
(Y1E: Main)
Inverter fan
(M1F)
Indoor unit electronic
expansion valve
(Y1E)
0 Hz
ON
OFF
0 pls
Step 4
+2 Step / 20 sec.
[Ending conditions]
OR
52 Hz
124 Hz
Initial opening
Step 8
10 sec.
· A lapse of 130 sec.
· Pc > 2.65MPa
· Pc-Pe > 0.4MPa.
Inverter compressor (INV.)
(M1C)
Electronic expansion valve
(Y1E: Main)
Inverter fan
(M1F)
Four way valve
(Y3S)