SiUS30-1301
D. Heating and Simultaneous Cooling/Heating Operation (When the condensing unit water cooled heat exchanger
is used as evaporator.)
(In case there are indoor units operating with cooling thermostat "ON".)
High temp. High pressure gas
High temp. High pressure liquid
Low temp. Low pressure gas
Low temp. Low pressure liquid
Refrigerant Circuit
Indoor Unit ON (Cooling) + Thermo. ON
Heat exchanger
FAN ON
EXP
Filter
Filter
(Normal operation)
Branch Selector Unit
Filter
EVL
EVLS
EVH
EVHS
EVSC
Filter
Filter
Condensing Unit
Check valve
SV
Solenoid valve
Check valve
Pressure
regulating
valve
Filter
Indoor Unit ON (Heating) + Thermo. ON
Heat exchanger
FAN ON
EXP
Filter
Filter
(Normal operation)
Filter
EVL
EVLS
EVH
EVHS
Filter
Filter
Solenoid valve
SV
Filter
Heat exchanger pipe
Filter
Electronic
expansion valve
Capillary
tube
Four-way valve
Solenoid valve
SV
Check
valve
Check valve
Strainer
Filter
Capillary
tube
Solenoid
Low pressure
valve
Gauge port
sensor
1/4" flare connection
Filter
To other condensing unit
Refrigerant Flow for Each Operation Mode
Indoor Unit ON (Heating) + Thermo. ON
Heat exchanger
FAN ON
EXP
Filter
Filter
(Normal operation)
EVSC
EVL
EVLS
EVH
Filter
Filter
Filter
Fusible
plug
Electronic
expansion valve
Filter
Filter
Water
inlet
SV
Plate heat
Solenoid valve
exchanger
Capillary
tube
Water
Service
outlet
port
Capillary
tube
Four-way valve
Gauge port
S1NPH
High pressure
sensor
S1PH
High pressure
switch
Compressor
INV.
Filter
EVHS
EVSC
Filter
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