31
OCH740
Capillary
tube
E
D
C
B
A
Strainer
#100
Condenser/evaporator
temperature thermistor
(TH5 or RT12)
Pipe temperature
thermistor/liquid
(TH2 or RT13)
Strainer
#100
Indoor units
Branch box
Outdoor unit
Thermistor (TH-A–E)
(Gas pipe temperature)
LEV A–E
(Linear expansion valve)
Room temperature
thermistor (TH1 or RT11)
Restrictor
valve
PAC-MK51/53BC
PAC-MK31/33BC
Branch box
Capillary tube behind LEV
(in cooling mode)
(ø4
o
ø3.0
o
L130)
o
5
(ø4
o
ø3.0
o
L130)
o
3
Unit: mm
LEV-A
LEV-B
HIC
Solenoid
valve (SV1)
High pressure
sensor (63HS)
High pressure
switch (63H)
Low pressure
sensor(63LS)
Oil separator
Service port
Strainer
Distributor
Compressor
Thermistor (TH4)
<Compressor>
Thermistor (TH7)
<Ambient>
<Outdoor liquid pipe>
Thermistor (TH3)
Ball valve
Strainer
4-way valve
Check valve
<Low pressure>
Thermistor (TH6)
<Suction pipe>
Check valve
<High pressure>
Strainer
Strainer
Strainer
Strainer
Thermistor (TH2)
<HIC pipe>
Stop valve
Service port
Capillary
tube
Accumulator
Strainer
Refrigerant flow in cooling
Refrigerant flow in heating
7-4. REFRIGERANT SYSTEM DIAGRAM (WHEN USING BRANCH BOX)
■ In the case of using 2-branch boxes
A
B
B
B
B
B
Branch box
A
A
A
B
B
B
B
B
2 branches pipe (joint)
: optional parts
Branch box #1
Branch box #2
■ In the case of using 1-branch box
Flare connection employed (No brazing)
■ Installation procedure (2 branch pipe (joint))
Refer to the installation manuals of
MSDD-50AR-E and MSDD-50BR-E.
Unit: mm
Capillary tube behind LEV (in cooling mode)
Branch box
PAC-MK54BC
(
ø
4 ×
ø
3.0 × L130) × 5
PAC-MK34BC
(
ø
4 ×
ø
3.0 × L130) × 3
Piping connection size
A
B
Liquid (mm)
ø
9.52
The pipe connection size differs according to the type and capacity of indoor
units. Match the piping connection size of branch box with indoor unit.
If the piping connection size of branch box does not match the piping connection
size of indoor unit, use optional different-diameter (deformed) joints to the branch
box side. (Connect deformed joint directly to the branch box side.)
Gas (mm)
ø
15.88
