REFRIGERANT SYSTEM DIAGRAM
30
9
Unit:mm
MXZ-A18WV -
E1
High-pressure
protect thermistor
RT68
Compressor
Discharge
temperature
thermistor
RT61
R.V. coil
heating ON
cooling OFF
Refrigerant flow in cooling
Refrigerant flow in heating
Muffler
Outdoor
heat
exchanger
Muffler
LEV (A)
Evaporation
temperature
thermistor
RT63
LEV (B)
Strainer
#100
Strainer
Strainer
#100
Defrost
thermistor
RT62
Capillary tube
{
3.0
✕
{
1.8
✕
600
Capillary tube
{
1.8
✕
{
0.6
✕
750
Capillary tube
{
3.0
✕
{
2.0
✕
400
Capillary tube
{
3.0
✕
{
2.0
✕
400
Stop valve
(with service port)
Gas pipe temperature
B thermistor
Gas pipe temperature
A thermistor
Stop valve
Stop valve
Indoor
Unit B
Indoor
Unit B
Indoor
Unit A
Indoor
Unit A
Stop valve
(with service port)
4-way valve
{
8
{
6
{
6
{
12
{
12
●
Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the
tables below.
●
When diameter of refrigerant pipe is different from that of outdoor unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe, see page BACK COVER.
Indoor unit
Extension pipe diameter
class
Pipe diameter
Liquid
6.35(1/4)
Liquid
6.35(1/4)
07/09
Gas
9.52(3/8)
Gas
9.52(3/8)
Liquid
6.35(1/4)
Liquid
6.35(1/4)
12
Gas
12.7(1/2)
Gas
12.7(1/2)
Outdoor unit union diameter
For
Liquid
6.35(1/4)
Indoor unit A
Gas
9.52(3/8)
Liquid
6.35(1/4)
Indoor unit B
Gas
9.52(3/8)
Unit : mm (inch)
Piping length each indoor unit (a, b)
20m
Total piping length (a+b)
30m
Height difference between units (H)
10m
Bending point for each unit
15
Total bending point
30
❋
It does not matter which unit is higher.
Refrigerant piping length (one way, 2 unit total)
Calculation : Xg=20g/mx(Refrigerant piping length(m)-20)
Indoor
units
a
Outdoor
unit
b
H
H
H
Outdoor unit
precharged
30m
200
20m
0
25m
100
1,750
MAX REFRIGERANT PIPING LENGTH
OB319--1.qxp 03.12.3 0:55 PM Page 30
