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11.1. Insulation of refrigerant lines
To avoid condensation, provide sufficient anti-sweating insulation to the refrigerant pipes and drain pipes.
When using commercially available refrigerant pipes, be sure to cover them with insulating material with
a heat-resistant temperature rating of more than 100° C (212° F). The recommended thickness of the
insulation can be found in the chart below. This applies to both the liquid and gas pipes. Insulate all indoor
pipes with polyethylene insulation with a minimum density of 0.03 g/cm^3 [2.0 LB/ft^3] and a thickness as
specified in the table below.
Pipe size
6.4 mm to 25.4 mm [1/4 to 1 in]
28.6 mm to 38.1 mm [1-1/8 to 1-1/2 in]
• If the unit is used on the highest story of a building and under high temperature and high humidity, it is
necessary to use thicker insulation than specified in the table above.
• If there are customer's specifications, please follow them.
11.2. Piping size
Model
PAA-A18AA1
PAA-A18BA1
PAA-A24AA1
PAA-A24BA1
PAA-A30AA1
PAA-A30BA1
PAA-A36BA1
PAA-A36CA1
PAA-A42BA1
PAA-A42CA1
1
When PUZ outdoor unit is connected, please use 3/8" pipe size with PAC‑493PI for the liquid pipe.
2
When PUZ outdoor unit is connected, please use 5/8" pipe size with PAC‑A456JP‑E for the gas pipe.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
Liquid
Gas pipe
pipe
1
2
1/4"
1/2"
1
2
1/4"
1/2"
3/8"
5/8"
3/8"
5/8"
3/8"
5/8"
3/8"
5/8"
3/8"
5/8"
3/8"
5/8"
3/8"
5/8"
3/8"
5/8"
61
Insulation thickness
> 10 mm [7/16 in]
> 15 mm [5/8 in]
Drain pipe
O.D. 32 mm (1-1/4 in)
O.D. 32 mm (1-1/4 in)
O.D. 32 mm (1-1/4 in)
O.D. 32 mm (1-1/4 in)
O.D. 32 mm (1-1/4 in)
O.D. 32 mm (1-1/4 in)
O.D. 32 mm (1-1/4 in)
O.D. 32 mm (1-1/4 in)
O.D. 32 mm (1-1/4 in)
O.D. 32 mm (1-1/4 in)
© 2022 Mitsubishi Electric US, Inc.
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