Indoor Low-Temperature Hydrobox - Daikin VRV RXYQ72-384XAYCA Service Manual

SiUS342004EB
1.3

Indoor Low-Temperature Hydrobox

HXY48TAVJU*
No. in piping
diagram
Pump
(1)
Flow switch
(2)
Electronic expansion valve
(3)
Thermistor
(4)
(outlet water temperature)
Thermistor
(5)
(inlet water temperature)
Thermistor
(6) (refrigerant liquid pipe)
Thermistor
(7)
(refrigerant gas pipe)
(8) Plate-type heat exchanger
F A L R E C O N . N
SCREW CONN.
WATER SIDE
WATER OUTLET
SHUT OFF VALVE WITH
DRAIN/FILL VALVE
FIELD INSTALLED
WATER INLET
SHUT OFF VALVE WITH
DRAIN/FILL VALVE
FIELD INSTALLED
Part 2 Refrigerant Circuit
Name
C H E K C V A V L E B R A
F A L N G E C O N . N P N I
AIR PURGE
FLOWSWITCH
MANOMETER
SAFETY VALVE
(1)
PUMP
FILTER
EXPANSION
VESSEL
Symbol
Circulates water to the local water piping and radiator. It
M1P
operates at a maximum of 4,800 rpm.
Detects an abnormality in the water circuit. If the flow rate of
S1L
water is below a certain value, an error will be issued.
In cooling operation, the superheating at the outlet of the
K1E
plate-type heat exchanger is controlled to be constant.
Detects the outlet water temperature of the plate-type heat
R1T
exchanger. It is used for thermo-off judgment.
Detects the inlet water temperature of the plate-type heat
R2T
exchanger.
Detects the liquid pipe temperature of the plate-type heat
R3T exchanger. It is used to judge the freeze-up prevention
control in cooling operation.
Detects the gas pipe temperature of the plate-type heat
R4T
exchanger.
— Exchanges heat between refrigerant and water.
E Z D C O N . N Q I U K C C O U L P N I G
C H E D I P E P SPINNED PIPE
(2)
(4)
R1T
(8)
PLATE HEAT EXCHANGER
EVAPORATOR =
CONDENSOR =
(5)
R2T
THERMISTOR DESCRIPTION
R1T OUTLET WATER HEAT EXCHANGER THERMISTOR
R2T INLET WATER HEAT EXCHANGER THERMISTOR
R3T REFRIGERANT LIQUID SIDE THERMISTOR
R4T REFRIGERANT GAS SIDE THERMISTOR
Refrigerant Circuit (Piping Diagrams)
Function
REFRIGERANT SIDE
REFR.IN
(7)
R4T FILTER
REFR.OUT
(3)
REFR.IN
EXPANSION
(6)
VALVE
FILTER FILTER
R3T
REFR.OUT
3D079034
40