Startup Control In Heating Operation - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C
5.2

Startup Control in Heating Operation

Actuator
Compressor 1
Compressor 2
Compressor 3
Outdoor unit fan 1
Outdoor unit fan 2
Electronic expansion
valve (Main)
Electronic expansion
valve (Subcooling)
Electronic expansion
valve (Refrigerant
charge)
Solenoid valve
(Refrigerant regulator gas
purging pipe)
Four way valve
(Heat exchanger switch)
Solenoid valve
(Refrigerant regulator
liquid pipe)
Solenoid valve (Hot gas)
Solenoid valve (Main
bypass)
Solenoid valve
(Refrigerant regulator
discharge pipe)
Solenoid valve
(Refrigerant regulator
discharge pipe)
Four way valve (High/low
pressure gas pipe switch)
Ending conditions
Function
Pressure
Elect. equalization
Symbol
symbol control
before startup
M1C
— M2C 0 Hz
M3C
M1F
— STEP4
M2F
EVM Y1E 0 pls
EVT Y3E 0 pls
EVJ Y2E 80 pls
SVG Y1S OFF
20SA Y3S ON
SVL Y4S OFF
SVP Y5S OFF
SVE Y6S OFF
SVO Y7S OFF
SVT Y8S OFF
20SB Y2S OFF
A lapse of 60
sec.
Startup control
STEP1
52 Hz+OFF+OFF
20SA=ON: STEP7
20SA=ON: SH Control
0 pls
80 pls
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
A lapse of 15 sec.
Startup Control
STEP2
52Hz+OFF+OFF+2STEP / 20
sec.
(Until it reaches
Pc-Pe>0.39 MPa)
20SA=ON: STEP7
20SA=ON: SH Control
0 pls
80 pls
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
• A lapse of 90 sec.
OR
• Pc - Pe>0.39 MPa
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