Function Unit - Daikin RTSQ20PY1 Service Manual

Vrv iii-c r-410a heat pump 50hz
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Refrigerant Circuit
1.5

Function Unit

BTSQ20P
No.
Symbol
1
M1C
Inverter compressor
Electronic expansion valve (Liquid
2
Y1E
injection)
Electronic expansion valve (Two-
3
Y2E1
stage selection-1)
Electronic expansion valve (Two-
4
Y2E2
stage selection-2)
5
Y1S
Solenoid valve (Hot gas)
Solenoid valve (Two-stage
6
Y2S
pressure reduction)
7
Y3S
Solenoid valve (Bypass 1)
8
Y4S
Solenoid valve (Bypass 2)
Solenoid valve (Liquid line
9
Y5S
selection)
10
S1NPH High pressure sensor
11
S1PH
High pressure switch
12
Capillary tube
13
Capillary tube
14
R3T
Discharge pipe thermistor
15
R4T
Liquid temperature thermistor
Service port
To
Filter
indoor
unit
Gas pipe
Service port
Filter
Liquid pipe
(10) High pressure
S1NPH
sensor
(11) High pressure switch
S1PH
Compressor
(1)
INV
61
Name
Inverter compressor is operated on frequencies between 52Hz and
280Hz by using the inverter. Compressor operation steps: Refer to
page 93.
Used to conduct PI control so that the discharge pipe superheated
degree of the compressor will be kept constant.
Open (fully open) to conduct heating operation at low outdoor
temperatures (while in two-stage compression mode).
Used to prevent transitional suction pressure drops by hot gas
injection.
Open to conduct heating operation at low outdoor temperatures (while
in two-stage compression mode).
Open to conduct cooling operation or normal heating operation (while
in single-stage compression mode).
Open to conduct normal heating operation (while in single-stage
compression mode).
Used to detect high pressure.
Activated when pressure rises to stop operation, in order to prevent
high pressure from rising in case of a malfunction.
Used to return refrigeration oil separated through the oil separator to
the INV. compressor.
Used to prevent liquid sealing when operation stops.
Used to detect discharge pipe temperature.
Used to detect the equivalent saturation temperature of intermediate
pressure while in two-stage compression mode.
(2) Electronic
Check
expansion valve
valve
(5) Solenoid valve
SV
Check
Filter
valve
Filter
(14)
(12) Capillary tube
Function
SV
SV
(3) Electronic
expansion valve
(13) Capillary tube
Check valve
Check valve
SV
(9) Solenoid
valve
(6) Solenoid valve
Check valve
Gas and
liquid
(15)
separator
SiBE31-801_C
(7) Solenoid valve
(8) Solenoid valve
Filter
Gas pipe
(4) Electronic
expansion valve
Check
valve
Filter
Liquid pipe
Check valve
Filter
C: 3D060823
Refrigerant Circuit
To
outdoor
unit

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