Daikin RTSQ20PY1 Service Manual page 117

SiBE31-801_C
8.1.2 Pump down Residual Operation in Heating Operation (Outdoor Unit)
Actuator
Compressor 1
Compressor 2
Compressor 3
Outdoor unit fan 1
Outdoor unit fan 2
Electronic expansion valve (Main) Y1E
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
8.1.3 Function Unit [Only applicable to heating operation at low outdoor
temperature]
Part name
Compressor
Electronic expansion valve (Liquid
injection)
Electronic expansion valve (Two-
stage switching-1)
Electronic expansion valve (Two-
stage switching-2)
Solenoid valve (Hot gas)
Solenoid valve (Two-stage pressure
reducing)
Solenoid valve (Bypass 1)
Solenoid valve (Bypass 2)
Solenoid valve (Liquid line switch)
Ending conditions
Function
Elect.
Master unit operation
symbol
M1C 124 Hz
M2C OFF
M3C OFF
M1F
Fan STEP No. 8
M2F
0 pls
Y3E 0 pls
Y2E 80 pls
Y1S OFF
Y3S ON
Y4S OFF
Y5S OFF
Y6S ON
Y7S OFF
Y8S OFF
Y2S OFF
• 3 min.
• Master unit Pe<0.24 MPa
or • Master unit Pc>3.14 MPa
• Master unit Tdi>110°C
• Master unit Tp>140°C
Electrical symbol
M1C
Y1E
Y2E1
Y2E2
Y1S
Y2S
Y3S
Y4S
Y5S
Slave unit operation
(RTSYQ20PY1 only)
OFF
Fan STEP No. 4
0 pls
0 pls
80 pls
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
Function unit operation
OFF
0 pls
0 pls
0 pls
OFF
OFF
OFF → ON (Pc>2.45MPa)
OFF → ON (Pc>2.45MPa)
OFF → ON (after a lapse of 15 sec.)
A lapse of 30 sec.
Special Control
106