Mitsubishi Electric MXZ-3C68VA Service Manual download pdf (Page 23)

UNIT: mm

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".

UNIT: mm (inch)

Piping length each indoor unit (a, b, c, d) 25m

Total piping length (a+b+c+d) 60m

Bending point for each unit 25

Total bending point 60

MXZ-4C71VA

MAX REFRIGERANT PIPING LENGTH

Indoor unit

Extension pipe diameter

class Pipe diameter

15/20/22/25/35/42

Liquid 6.35(1/4) Liquid 6.35(1/4)

Gas 9.52(3/8) Gas 9.52(3/8)

Liquid 6.35(1/4) Liquid 6.35(1/4)

Gas 12.7(1/2) Gas 12.7(1/2)

Liquid 6.35(1/4) Liquid 6.35(1/4)

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)

Indoor unit

Power

receiver

LEV A

LEV B

LEV C

LEV D

Oil separator

Compressor

Muffler

4-way valve

LEV E

Indoor unit

Capillary tube

Discharge

temperature

thermistor RT62

Strainer

#100

Strainer

#100

Strainer

#100

Strainer

#100

Strainer

#100

R.V. coil

OFF

Refrigerant flow in cooling

Refrigerant flow in heating

Distributor

HEX-OUT

Outdoor heat

exchanger

temperature

thermistor

RT68

Defrost

thermistor

RT61

Capillary tube

Ambient

temperature

thermistor

RT65

FAN-OUT

Strainer

#100

Stop valve with

service port

Stop valve

High-pressure

switch

Outdoor

unit

Indoor

units

15m

10m

15m

Refrigerant piping length (one way, 4 unit total)

Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 40)

Max.

Height

difference

Outdoor unit

precharged

(g)

50m

200

40m

2,700

60m

400

It is irrelevant which unit is higher.

ADDITIONAL REFRIGERANT CHARGE

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 269 270

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Mitsubishi Electric MXZ-3C68VA Service Manual Page 23

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