Max Refrigerant Piping Length; Additional Refrigerant Charge - Mitsubishi Electric MXZ-3C54VA Service Manual

MXZ-4C71VA
R.V. coil
Refrigerant flow in cooling
OFF
ON Refrigerant flow in heating
Indoor unit
D
Indoor unit
C
Indoor unit
B
Indoor unit
A
Indoor unit
A
Indoor unit
B
Indoor unit
C
Indoor unit
D

MAX REFRIGERANT PIPING LENGTH

Piping length each indoor unit (a, b, c, d)
Total piping length (a+b+c+d)
Bending point for each unit
Total bending point
It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

Outdoor unit
Refrigerant piping length (one way, 4 unit total)
precharged
(g) 40m
2,700
0
Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 40)
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, refer to "PARTS CATALOG".
Indoor unit
class Pipe diameter
Liquid
15/20/22/25/35/42
Gas
Liquid
50
Gas
Liquid
60
Gas
High-pressure
switch
Oil separator
Stop valve with
service port
Muffler
Capillary tube
Strainer LEV A
#100
Strainer
#100
LEV B
Strainer
#100
Strainer LEV C
#100
LEV D
Strainer
#100
50m
200
Extension pipe diameter
6.35(1/4) Liquid
9.52(3/8) Gas
6.35(1/4) Liquid
12.7(1/2) Gas
6.35(1/4) Liquid
15.88(5/8) Gas
Compressor
Discharge
temperature
thermistor RT62
Capillary tube
4-way valve
Stop valve
LEV E
Power
receiver
Indoor
25m
units
60m
25
60
60m
400
6.35(1/4)
Indoor unit A
9.52(3/8)
6.35(1/4)
Indoor unit B
12.7(1/2)
6.35(1/4)
Indoor unit C
15.88(5/8)
Indoor unit D
23
Outdoor heat
exchanger
temperature
thermistor
RT68
Strainer
#100
Distributor
a
b
Outdoor
unit
c
d
Outdoor unit union diameter
For
Liquid
Gas
Liquid
Gas
Liquid
Gas
Liquid
Gas
UNIT: mm
FAN-OUT
Ambient
temperature
thermistor
RT65
Defrost
thermistor
RT61
Capillary tube
Max.
Height
difference
15m
15m
10m
UNIT: mm (inch)
6.35(1/4)
12.7(1/2)
6.35(1/4)
9.52(3/8)
6.35(1/4)
9.52(3/8)
6.35(1/4)
9.52(3/8)