Necessary Conditions For System Construction - Mitsubishi Electric MXZ-8B48NA Technical & Service Manual

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NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

REFRIGERANT SYSTEM DIAGRAM
Condenser / evaporator
temperature thermistor Room temperature
(TH5 or RT12) thermistor (TH1 or RT11)
Pipe temperature
thermistor / liquid
(TH2 or RT13)
Indoor units
Outdoor unit MXZ-8B48NA
MXZ-8B48NAR1
PAC-AKA51BC
Branch box
PAC-AKA31BC
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
2 branches pipe (joint)
: optional parts
A A
B
4-way valve
E
Service port
D
C
B Strainer
#50
A
Ball valve
Check valve
Thermistor (TH-A~E)
(Low Pressure)
(Gas pipe temperature)
Strainer
LEV A~E
#100
(Linear expansion valve)
Strainer
#100
Stop valve
Strainer
#100
Service port
Capillary
Capillary
tube3
tube4
Branch box
Capillary tube 1
(For return of oil
from oil separator)
2.5 0.8 L1000
( 0.098 0.031 L(39-1/2))
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 B
Branch box #1
A
B
Branch box #2
MXZ-8B48NA MXZ-8B48NAR1
Check valve
Bypass valve(SV2)
(High Pressure)
Bypass valve (SV1)
Strainer
#100
Capillary
tube1
High
pressure
switch
63H
Capillary Oil separator
tube2
Thermistor TH4
(For MXZ-8B48NA)
Low
(Discharge temperature)
pressure
switch
63L
Thermistor TH8
(Fin temperature)
Accumulator
Compressor
Thermistor TH4
Strainer
(For MXZ-8B48NAR1)
#100
(Compressor temperature)
Outdoor unit
Capillary tube 3
Capillary tube 2
ahead of LEV
(For SV2)
(in cooling mode)
4 2.4 L250
( 0.157 0.094 L10)
( 4
( 0.157
( 4
( 0.157
B
B B
B B B
38
High pressure sensor
discharge pressure sensor
63HS
Thermistor TH7
(Outdoor temperature)
Thermistor TH6
(Pipe temperature : condenser)
Thermistor TH3
(Pipe temperature : liquid)
Distributor
with Strainer
Refrigerant flow in cooling
Refrigerant flow in heating
unit : mm (inch)
Capillary tube 4
behind LEV
(in cooling mode)
2.4 L140) 5
( 4 2.2 L130)
0.094 L(5-1/2)) 5 ( 0.157 0.087 L(5-1/8)) 5
2.4 L140) 3
( 4 2.2 L130)
0.094 L(5-1/2)) 3 ( 0.157 0.087 L(5-1/8)) 3
installation procedure (2 branch pipe (joint))
Refer to the installation manuals of MSDD-
50AR-E and MSDD-50BR-E.
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