5. Refrigerant pipe specifications
Refer to the Outdoor Unit installation manual for more information on pipe size for the air handler and piping
configurations for the overall system.
To avoid dew drops, provide sufficient insulation to the refrigerant and drain pipes.
When using commercially available refrigerant pipes, be sure to wrap commercially available insulating
material (with a heat-resisting temperature of more than 212 °F [100 °C] and thickness given below) onto
both liquid and gas pipes.
Be also sure to wrap commercially available insulating material (with a form polyethylene’s specific gravity
of 0.03 and thickness given below) onto all pipes which pass through rooms.
1. Select the thickness of insulating material by pipe size.
Pipe size Insulating material’s thickness
1/4 in to 1 in [6.4 mm to 25.4 mm] Minimum of 3/8 in [10 mm]
1 1/4 in to 1 1/2 in [28.6 mm to 38.1 mm] Minimum of 5/8 in [15 mm]
2. If the unit is used on the highest story of a building and under conditions of high temperature and
humidity, it is necessary to use pipe size and insulating material’s thickness more than those given in
the table above.
3. If there are customer’s specifications, simply follow them.
PAC-AH001-1
21 © 2017 Mitsubishi Electric US, Inc.
ENGLISH
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