Necessary Conditions For System Construction; Refrigerant System Diagram; Optional Parts - Mitsubishi Electric MXZ-8A140VA Technical & Service Manual

8

NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION

REFRIGERANT SYSTEM DIAGRAM

Condenser / evaporator
Room temperature
temperature thermistor
(TH5 or RT12) thermistor (TH1 or RT11)
Thermistor (TH-A~E)
(Gas pipe temperature)
(Linear expansion valve)
Strainer
#100
Pipe temperature
thermistor / liquid Capillary
(TH2 or RT13)
Indoor units
MXZ-8A140VA
MXZ-8A140VA
Outdoor unit
MXZ-8A140VA
MXZ-8A140VA
PAC-AK50BC
Branch box
PAC-AK30BC
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
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 o [0.8 o L1000
1
2
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
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 o [2.4 o L250
B B B
Branch box #1
B B B
installation procedure (2 branch pipe (joint))
Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.
38
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
(Discharge temperature)
Thermistor TH8
(Fin temperature)
Compressor
Refrigerant flow in cooling
Refrigerant flow in heating
Capillary tube 3
ahead of LEV
(in cooling mode)
([4 o [2.4 o L140) o 5 ([4 o [2.2 o L130) o 5
([4 o [2.4 o L140) o 3 ([4 o [2.2 o L130) o 3
B
unit : mm
Capillary tube 4
behind LEV
(in cooling mode)