Daikin VRV EMERION RXYQ-AATJA, Service Manual

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Refrigerant Circuit (Piping Diagrams) SiUS342303E
45 Part 2 Refrigerant Circuit
1.3 Indoor Low-Temperature Hydrobox
HXY48TAVJU*
No. in piping
diagram
Name Symbol Function
(1)
Pump
M1P
Circulates water to the local water piping and radiator. It
operates at a maximum of 4,800 rpm.
(2)
Flow switch
S1L
Detects an abnormality in the water circuit. If the flow rate of
water is below a certain value, an error will be issued.
(3)
Electronic expansion valve
K1E
In cooling operation, the superheating at the outlet of the
plate-type heat exchanger is controlled to be constant.
(4)
Thermistor
(outlet water temperature)
R1T
Detects the outlet water temperature of the plate-type heat
exchanger. It is used for thermo-off judgment.
(5)
Thermistor
(inlet water temperature)
R2T
Detects the inlet water temperature of the plate-type heat
exchanger.
(6)
Thermistor
(refrigerant liquid pipe) R3T
Detects the liquid pipe temperature of the plate-type heat
exchanger. It is used to judge the freeze-up prevention
control in cooling operation.
(7)
Thermistor
(refrigerant gas pipe)
R4T
Detects the gas pipe temperature of the plate-type heat
exchanger.
(8) Plate-type heat exchanger — Exchanges heat between refrigerant and water.
3D079034
G N I L P U O C K C I U Q . N N O C D E Z A R B E V L A V K C E H C . N N O C E R A L F
SPINNED PIPE E P I P D E H C N I P . N N O C E G N A L F SCREW CONN.
PLATE HEAT EXCHANGER
EVAPORATOR =
CONDENSOR =
REFR.IN
REFR.OUT
REFR.IN
REFR.OUT
R4T
R2T
R1T
R3T
WATER INLET
WATER OUTLET
WATER SIDE REFRIGERANT SIDE
FILTER FILTER
FILTER
FILTER
EXPANSION
VALVE
FLOWSWITCH
AIR PURGE
SHUT OFF VALVE WITH
DRAIN/FILL VALVE
FIELD INSTALLED
SHUT OFF VALVE WITH
DRAIN/FILL VALVE
FIELD INSTALLED
EXPANSION
VESSEL
PUMP
SAFETY VALVE
MANOMETER
THERMISTOR DESCRIPTION
R1T
OUTLET WATER HEAT EXCHANGER THERMISTOR
R2T INLET WATER HEAT EXCHANGER THERMISTOR
R3T REFRIGERANT LIQUID SIDE THERMISTOR
R4T REFRIGERANT GAS SIDE THERMISTOR
(2)
(4) (7)
(8)
(3)
(6) (5)
(1)