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Refrigerant pipe diameter is different according to indoor unit to be connected. When using extension pipes, refer to the
tables below.
When the 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 the appropriate parts catalog, Optional parts "DIFFERENT
DIAMETER PIPE"(2-1.).
Unit : inch
Piping length each indoor unit (a, b, c, d) 82 ft. MAX.
Total piping length (a+b+c+d) 230 ft. MAX.
Bending point for each unit 25 MAX.
Total bending point 70 MAX.
It is irrelevant which unit is higher.
MAX. REFRIGERANT PIPING LENGTH & PIPE SIZE SELECTION
MXZ-4B36NA
Operating Range MXZ-4B36NA
a
b
c
d
Outdoor
unit
Indoor
units
49 ft.
33 ft.
49 ft.
Max. height difference
Cooling
Heating
Maximum
Minimum
Maximum
Minimum
Indoor intake air temperature
95°FDB, 71°FWB
67°FDB, 57°FWB
80°FDB, 67°FWB
70°FDB, 60°FWB
Outdoor intake air temperature
115°FDB
14°FDB
75°FDB, 65°FWB
6°FDB, 5°FWB
Indoor unit class
Extension pipe diameter
09 or less
Liquid 1/4
Gas 3/8
12
Liquid 1/4
Gas 3/8
15
Liquid 1/4
Gas 1/2
17
Liquid 1/4
Gas 1/2
18
Liquid 1/4
Gas 1/2
24
Liquid 1/4
Gas 5/8
Outdoor unit union diameter
For
Indoor unit A
Liquid 1/4
Gas 1/2
Indoor unit B
Liquid 1/4
Gas 3/8
Indoor unit C
Liquid 1/4
Gas 3/8
Indoor unit D
Liquid 1/4
Gas 3/8