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7
NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION
REFRIGERANT SYSTEM DIAGRAM
MXZ-8B140VA MXZ-8B140YA MXZ-8B160VA MXZ-8B160YA
Condenser / evaporator
temperature thermistor
Room temperature
thermistor (TH1 or RT11)
(TH5 or RT12)
Thermistor (TH-A~E)
(Gas pipe temperature)
(Linear expansion valve)
Strainer
#100
Pipe temperature
thermistor / liquid
Capillary
(TH2 or RT13)
Indoor units
MXZ-8B140VA
MXZ-8B160VA
Outdoor unit
MXZ-8B140YA
MXZ-8B160YA
PAC-AK52BC
Branch box
PAC-AK31BC
Piping connection size
A
{9.52
Liquid (mm)
{15.88
Gas (mm)
■ In case of using 1-branch box
Flare connection employed (No brazing)
A
■ In case of using 2-branch boxes
A
B
OCH480A
4-way valve
E
Service port
D
C
B
A
Ball valve
Check valve
(Low Pressure)
Strainer
LEV A~E
#100
Stop valve
Strainer
#100
Service port
Capillary
tube3
tube4
Branch box
Capillary tube 1
(For return of oil
from oil separator)
2.5
0.8
L1000
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
Bypass valve(SV2)
Bypass valve (SV1)
Strainer
#100
Strainer
#50
Capillary
tube1
Capillary
tube2
Low
pressure
switch
63L
Accumulator
Strainer
#100
Outdoor unit
Capillary tube 2
(For SV2)
4
2.4
L250
B
B
B
Branch box #1
B
B
B
19
High pressure sensor
discharge pressure sensor
Check valve
63HS
(High Pressure)
Thermistor TH7
(Outdoor temperature)
Thermistor TH6
(Pipe temperature : condenser)
Thermistor TH3
(Pipe temperature : liquid)
High
Distributor
pressure
with Strainer
switch
63H
Oil separator
Thermistor TH4
(Compressor temperature)
Thermistor TH8
(Fin temperature)
Compressor
Refrigerant flow in cooling
Refrigerant flow in heating
Capillary tube 3
ahead of LEV
(in cooling mode)
( 4
2.4
L140)
5 ( 4
( 4
2.4
L140)
3 ( 4
B
■ installation procedure (2 branch pipe (joint))
Refer to the installation manuals of
MSDD-50AR-E and MSDD-50BR-E.
unit : mm
Capillary tube 4
behind LEV
(in cooling mode)
2.2
L130)
5
2.2
L130)
3
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