Piping Connection Size - Mitsubishi Electric City Multi PUMY-SP112VKM Technical & Service Manual

7-4. REFRIGERANT SYSTEM DIAGRAM (WHEN USING BRANCH BOX)
Condenser / evaporator
Room temperature
temperature thermistor
thermistor (TH1 or RT11)
(TH5 or RT12)
Pipe temperature
thermistor / liquid
(TH2 or RT13)
Indoor units
PAC-MK31/33BC(B)
Branch box
PAC-MK51/53BC(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
OCH668B
E
D
Service port
C
B
Ball valve
A
Thermistor (TH-A–E)
(Gas pipe temperature)
LEV A–E
(Linear expansion valve)
Strainer
#100
A
Thermistor (TH2)
<HIC pipe>
B
Stop valve
C
D
Strainer
E
Service port
#100
Capillary tube
Branch box
Capillary tube behind LEV
(in cooling mode)
([4.0 o [3.0 o L130) o 3
([4.0 o [3.0 o L130) o 5
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
Strainer
Low pressure
sensor(63LS)
Solenoid
Check valve
valve
<Low pressure>
(SV1)
Thermistor (TH6)
<Suction pipe>
Accumulator
HIC
Strainer
Strainer
LEV-B
Strainer
Refrigerant flow in cooling
Refrigerant flow in heating
Outdoor unit
Unit: mm
B
B B B
Branch box #1
B B B
33
Check valve
<High pressure>
Oil separator
High pressure
sensor (63HS)
Strainer
Capillary High pressure
tube switch (63H)
Thermistor (TH4)
<Compressor>
Compressor
Strainer
LEV-A
Refrigerant flow in cooling (Main)
Refrigerant flow in heating (Main)
Refrigerant flow in cooling (Sub)
■ Installation procedure (2 branch pipe (joint))
Refer to the installation manuals of
MSDD-50AR-E.
Thermistor (TH7)
<Ambient>
Distributor
Thermistor (TH3)
<Outdoor liquid pipe>