Mitsubishi Electric PUMY-P112VKM3 Technical & Service Manual page 36

7-4. REFRIGERANT SYSTEM DIAGRAM (WHEN USING BRANCH BOX)
Condenser / evaporator
temperature thermistor Room temperature
thermistor (TH1 or RT11)
(TH5 or RT12)
(Linear expansion valve)
Strainer
#100
Pipe temperature
Capillary
thermistor / liquid
(TH2 or RT13)
Indoor units
PAC-MK51/52BC(B)
Branch box
PAC-MK31/32BC(B)
Piping connection size
A
Liquid (mm)
{9.52
Gas (mm)
{15.88
■ In case of using 1-branch box
Flare connection employed (No brazing)
A
■ In case of using 2-branch boxes
A
B
OCH632A
E
Service port
D
Strainer
C
B
Ball valve
A
Thermistor (TH-A–E)
(Gas pipe temperature)
LEV A–E
Thermistor (TH2)
<HIC pipe>
Stop valve
Strainer
Service port
#100
tube
Branch box
Capillary tube behind LEV
(in cooling mode)
([4 o [3.0 o L130) o 5
([4 o [3.0 o L130) o 3
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.)
Branch box
B B
2 branches pipe (joint)
: optional parts
A
A
B
Branch box #2
4-way valve
Solenoid
valve (SV1)
Strainer
Check valve
Strainer
<Low pressure>
Thermistor (TH6)
<Suction pipe>
Low pressure
sensor(63LS)
Accumulator
HIC
Strainer
Strainer
LEV-B
Strainer
Outdoor unit
Unit: mm
B
B B B
Branch box #1
B B B
36
Check valve
Thermistor (TH7)
<High pressure>
<Ambient>
High pressure
Oil separator
switch (63H)
Capillary
High pressure
tube
sensor (63HS)
Thermistor (TH4)
<Compressor>
Compressor
Strainer
LEV-A
Refrigerant flow in cooling
Refrigerant flow in heating
■ Installation procedure (2 branch pipe (joint))
Refer to the installation manuals of
MSDD-50AR-E and MSDD-50BR-E.
Distributor
Thermistor (TH3)
<Outdoor liquid pipe>