94
a
b
c
d
Outdoor
unit
Indoor
units
10m
10m
10m
Refrigerant piping length (one way, 4 unit total)
Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 40)
Outdoor unit
precharged
(g)
60m
400
40m
0
50m
200
3,500
70m
600
Indoor unit
D
Ball valve with
service port
Ball valve
Distributor
Power
receiver
LEV A
LEV B
LEV C
LEV D
Oil separator
Compressor
High-pressure
switch
Distributor
Muffler
4-way valve
LEV E
Outdoor
heat
exchanger
Indoor unit
C
Indoor unit
B
Indoor unit
A
Indoor unit
A
Indoor unit
B
Indoor unit
C
Indoor unit
D
Capillary tube
Capillary tube
Capillary tube
Discharge
temperature
thermistor RT62
Strainer
#100
Strainer
#100
Strainer
#100
Strainer
#100
R.V. coil
OFF
ON
Refrigerant flow in cooling
Refrigerant flow in heating
Defrost
thermistor
RT61
Outdoor heat
exchanger
temperature
thermistor
RT68
Ambient
temperature
thermistor
RT65
Strainer
#100
Strainer
#100
MXZ-4A80VA -
E1
UNIT: mm
UNIT: mm (inch)
It does not matter which unit is higher.
ADDITIONAL REFRIGERANT CHARGE
MAX REFRIGERANT PIPING LENGTH
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 17-1.
Piping length each indoor unit (a, b, c, d) 25m
Total piping length (a+b+c+d) 70m
Bending point for each unit 25
Total bending point 70
Indoor unit
Extension pipe diameter
class Pipe diameter
22/25/35
Liquid 6.35(1/4) Liquid 6.35(1/4)
Gas 9.52(3/8) Gas 9.52(3/8)
50
Liquid 6.35(1/4) Liquid 6.35(1/4)
Gas 12.7(1/2) Gas 12.7(1/2)
60
Liquid 6.35(1/4) Liquid 6.35(1/4)
Gas 15.88(5/8) Gas 15.88(5/8)
71
Liquid 9.52(3/8) Liquid 9.52(3/8)
Gas 15.88(5/8) Gas 15.88(5/8)
Outdoor unit union diameter
For
Indoor unit A
Liquid 6.35(1/4)
Gas 12.7(1/2)
Indoor unit B
Liquid 6.35(1/4)
Gas 9.52(3/8)
Indoor unit C
Liquid 6.35(1/4)
Gas 9.52(3/8)
Indoor unit D
Liquid 6.35(1/4)
Gas 9.52(3/8)
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