Startup Control; Cooling Start-Up Control - Daikin VRV - WII Service Manual

Startup Control

4. Startup Control

This startup control is used to provide the following control to reduce the compressor load resulting
from liquid return or else during compressor startup, and also determine the position of four way
valves.
4.1

Cooling Start-up Control

Both master and slave units operate same time for changing 4 way valve position
operation after completion.
Parts name
Compressor
Inverter cooling fan
4 way valve (Main)
4 way valve (for heat exchanger)
Main heat exchanger electronic exp. valve
Sub-cooling electronic exp. valve
Hot gas bypass solenoid valve
Water heat exch. oil return solenoid valve
Receiver gas charging solenoid valve
Receiver gas discharge solenoid valve
Non-operation unit liquid pipe stop
solenoid valve
Indoor unit fan
Indoor unit expansion valve
Cooling
BS 20RH
Heating
BS 20RT
Ending condition
62
Electrical
Symbol
symbol
— (M1C)
— (M1, 2F)
20S1 (Y5S)
20S2 (Y7S)
EV1 (Y1E)
EV3 (Y3E)
SVP (Y1S)
SVE (Y2S)
SVL (Y3S)
SVG (Y4S)
SVSL (Y6S)
— (M1, 2F)
EV (Y1E)
20RH (Y3S)
20RT (Y1S)
Thermostat ON
Pressure equalization
control before start-up
0 Hz
(until Pc-Pe > 71.05 psi)
OFF
Holding
Holding
0 pulse
0 pulse
OFF
OFF
OFF
OFF
ON
Indoor unit control
0 pulse
OFF
OFF
1 minute
SiUS30-604
→
Normal
Starting control
52Hz
+2 steps/20 sec.
Inverter cooling fan
control
OFF
OFF
2000 pulse
0 pulse
ON
OFF
OFF
OFF
ON
Indoor unit control
0 pluse Initial
opening
OFF
OFF
Max. 5 minutes
Function