Large Capacity Start Up Control (Heating) - Daikin RXYQ96PYDN Service Manual

Special Control
7.1.2 Startup Control in Heating Operation
Actuator
Compressor 1
Compressor 2
Outdoor unit fan 1
Outdoor unit fan 2
Electronic expansion
valve (Main)
Electronic expansion
valve (Subcooling)
Electronic expansion
valve (Refrigerant
charge)
Four-way valve
(Heat exchanger switch)
Four-way valve (High/low
pressure gas pipe switch)
Solenoid valve (Main
bypass)
Solenoid valve (Hot gas)
Solenoid valve
(Refrigerant regulator
liquid pipe)
Solenoid valve
(Refrigerant regulator gas
vent pipe)
Solenoid valve
(Refrigerant regulator
exhaust pipe)
Solenoid valve
(Refrigerant regulator
discharge pipe)
Ending conditions
7.2

Large Capacity Start Up Control (Heating)

For startup, oil return operation, or setup after defrosting, start up multiple compressors at a high speed according to the
198
Elect.
Control
symbol
Symbol
REYQ REMQ
M1C M1C
— 0 Hz
M2C M2C
M1F M1F
— STEP4
M2F M2F
Y1E
EVM Y1E 0 pls
Y3E
Y2E
EVT Y3E 0 pls
Y5E
EVJ Y4E Y2E 80 pls
When
outdoor
heat
exchanger
is
evaporator:
Y2S ON
20SA Y3S
Y9S When
outdoor
heat
exchanger
is
condenser:
OFF
20SB Y8S Y2S OFF
Y5S
SVE Y6S OFF
Y10S
SVP Y4S Y5S OFF
SVL Y3S Y4S OFF
SVG Y1S Y1S OFF
SVO Y7S Y7S OFF
SVT Y6S Y8S OFF
A lapse of
60 sec.
before
startup
STEP1
52 Hz+OFF
20SA=ON: STEP7
20SA=OFF
+1step/15 sec. (When
Pc_max>313.2 psi)
-1step/15 sec. (When
Pc_max<256.65 psi)
20SA=ON: SH Control
20SA=OFF: 1375 pls
0 pls
80 pls
When outdoor heat exchanger
is evaporator: ON
When outdoor heat exchanger
is condenser: OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
A lapse of 15 sec.
SiUS34-801A_b
Startup control
STEP2
52Hz+OFF+2STEP / 20 sec.
(Until it reaches
Pc-Pe>56.55 psi)
20SA=ON: STEP7
20SA=OFF
+1step/15 sec. (When
Pc_max>313.2 psi)
-1step/15 sec. (When
Pc_max<256.65 psi)
20SA=ON: SH Control
20SA=OFF: 1375 pls
0 pls
80 pls
When outdoor heat exchanger
is evaporator: ON
When outdoor heat exchanger
is condenser: OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
• A lapse of 90 sec.
OR
• Pc - Pe>56.55 psi
VRVIII R-410A Heat Recovery 60Hz