Daikin J Series Service Manual Page 141

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Flow of Refrigerant SiE18-201
130 Flow of Refrigerant
1.5 Low Outside Air Temperature Cooling
THERMISTOR
LIQUID PIPE
OUTDOOR UNIT
MOTOR
MOTOR
DC FAN
DC FAN
DISTRIBUTOR
(
DEL
)
PROPELLER
PROPELLER
M
M
FAN
FAN
REFRIGERANT FLOW
THERMISTOR
(
DOA
)
OUTDOOR TEMPARATURE
HEAT EXCHANGER
COOLING
HEAT EXCHANGER
(
DE
)
THERMISTOR
DISCHARGE PIPE
COMPRESSOR
THERMISTOR
HEADER
OIL
SEPARATOR
FILTER
(
DO
)
ELECTRONIC
EXPANSION VALVE
FILTER
ELECTRONIC
EXPANSION VALVE
EV
G
FILTER
LOW PRESSURE
EV
L
4-WAY VALVE
FILTER
SENSOR
CAPILLARY TUBE
FILTER
SP
HIGH PRESSURE
SWITCH
HPS
ELECTRONIC
EXPANSION VALVE
ACCUMULATOR
CAPILLARY TUBE
CHECK VALVE
FILTER
EV
P
FILTER
FLEXIBLE
TUBE
FILTER
FILTER
CHECK VALVE
SUCTION PIPE
THERMISTOR
LIQUID LINE
STOP VALVE
GAS LINE
STOP VALVE
(
DS
)
RECEIVER
EXPANSION VALVE
(
BYPASS
)
FILTER
FILTER
ELECTRONIC
EV
H
EXPANSION VALVE
(
ROOM A
)
EXPANSION VALVE
(
ROOM B
)
EXPANSION VALVE
(
ROOM C
)
ELECTRONIC
ELECTRONIC
ELECTRONIC
EV
C
EV
B
EV
A
FILTER
FILTER
FILTER
THERMISTOR
(
DGC
)
THERMISTOR
(
DGB
)
THERMISTOR
(
DGA
)
THERMISTOR
(
DLC
)
THERMISTOR
(
DLB
)
THERMISTOR
(
DLA
)
GAS SIDE
GAS SIDE
GAS SIDE
LIQUID SIDE
LIQUID SIDE
LIQUID SIDE
EXPANSION VALVE
(
BYPASS
)
FILTER
FILTER
ELECTRONIC
EV
H
EXPANSION VALVE
(
ROOM A
)
EXPANSION VALVE
(
ROOM B
)
ELECTRONIC
ELECTRONIC
EV
A
EV
B
FILTER
FILTER
THERMISTOR
(
DLA
)
THERMISTOR
(
DLB
)
THERMISTOR
(
DGA
)
THERMISTOR
(
DGB
)
GAS SIDE
GAS SIDE
LIQUID SIDE
LIQUID SIDE
EXPANSION VALVE
(
BYPASS
)
FILTER
FILTER
ELECTRONIC
EV
H
EXPANSION VALVE
(
ROOM A
)
EXPANSION VALVE
(
ROOM B
)
ELECTRONIC
ELECTRONIC
EV
A
EV
B
FILTER
FILTER
THERMISTOR
(
DLA
)
THERMISTOR
(
DLB
)
THERMISTOR
(
DGA
)
THERMISTOR
(
DGB
)
GAS SIDE
GAS SIDE
LIQUID SIDE
LIQUID SIDE
FIELD PIPING
FIELD PIPING
(
CuT
)
(
6.4CuT
)
SIRROCO FAN
FAN MOTOR
M
HEAT EXCHANGER
FIELD PIPING
FIELD PIPING
(
CuT
)
(
6.4CuT
)
SIRROCO FAN
FAN MOTOR
M
HEAT EXCHANGER
FIELD PIPING
FIELD PIPING
(
CuT
)
(
6.4CuT
)
SIRROCO FAN
FAN MOTOR
M
HEAT EXCHANGER
FIELD PIPING
FIELD PIPING
(
CuT
)
(
6.4CuT
)
SIRROCO FAN
FAN MOTOR
M
HEAT EXCHANGER
FIELD PIPING
FIELD PIPING
(
CuT
)
(
6.4CuT
)
SIRROCO FAN
FAN MOTOR
M
HEAT EXCHANGER
FIELD PIPING
FIELD PIPING
(
CuT
)
(
6.4CuT
)
SIRROCO FAN
FAN MOTOR
M
HEAT EXCHANGER
FIELD PIPING
FIELD PIPING
(
CuT
)
(
6.4CuT
)
SIRROCO FAN
FAN MOTOR
M
HEAT EXCHANGER
BP UNIT
(M1303)
Productive operation patterns
Cooling 1-room operation (2.5kW, 1-room operation with low outside air temperature)
A pressure difference must be kept in cooling mode with low outside temperature in order
to maintain the compressor reliability. To ensure such pressure difference, keep the EVL
fully open and let the refrigerant stay in the outdoor heat exchanger.
System control motorized valve : EVG
Each room distribution control motorized valve : EVU
EVL SC control (Not fully closed)
EVP Freeze-up protection control
EVG Target discharge pipe temperature
control
EVU SH control
EVT Full close
EVH Full close
"ON"
"OFF"
"OFF"
"OFF"
"OFF"
"OFF"
"ON"
: High pressure liquid refrigerant
: High pressure high temp. gas refrigerant
: Low pressure low temp. liquid or gas refrigerant
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