VRF-SVX26D-EN
19
Insulation
After determining that there are no leaks in the refrigerant pipes or drainage hose, insulate them
as described in these sections.
Insulating Refrigerant Pipes
1.
Use the table below to select the insulation type for each pipe size.
2. Wrap insulation around the entire surface of each pipe, from the indoor unit to the outdoor unit,
overlapping insulation to avoid gaps. Clamp insulation tightly to pipe.
•
Do not wrap the gas and liquid refrigerant pipes together.
•
Avoid compressing the insulation as much as possible.
•
Be sure there are no cracks or deformities in the insulation at bends in pipes.
•
If necessary double the insulation to prevent condensation from forming in warm or humid
areas.
•
Cut off excess insulation.
Insulating the Drainage System
Insulate (field supplied) the entire surface of the drain pipe that is inside the building, including the
connection between the drain hose and drain stub. Clamp tightly.
Pipe
Pipe size (in.)
Insulation, EPDM or NBR (in.)
Standard conditions
(86°F [30°C], 85%)
High humidity conditions
(a)
(86°F [30°C], over 85%)
Liquid pipe
1/4 – 3/8
3/8
3/8
1/2 – 2
1/2
1/2
Gas pipe
(b)
1/4 1/2
3/4
3/8 – 1
3/4
1.0
1-1/8 – 1-3/4
1-1/4
2 1.0
1-1/2
(a) When installing insulation in any of the following environments, use insulation required for high humidity conditions: Buildings with close proximity to
bodies of water or hot springs or on the side of a hill in which the building is partly covered by earth; ceilings frequently exposed to moisture such as
in restaurants, saunas, swimming pools, and corridors of dormitories or studios near a frequently-used outdoor exit; buildings with no ventilation system.
(b) Internal temperature of gas pipe is higher than 248°F (120°C).
