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Due to our policy of continuous product innovation, some specications may change without notication.
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DUCTED | 71
Refrigerant Piping Design and Best Practices
REFRIGERANT PIPING DESIGN
Condensate Drain Piping
Condensate Drain Piping
Condensate drain piping should be constructed out of materials approved by local codes (generally PVC). Drain piping must have downward
gradient of at least 1/50 to 1/100; to prevent reverse flow, slope should not be straight up and down, and support hangers should be used at
3-5/16 to 5 foot intervals to keep the condensate drainage system stable.
The inside temperature of the drain piping can rise to about 50°F. When high temperature and humidity air touch the outside surface of the
drain pipe, condensation may form. To prevent condensation from forming, install polyethylene insulation 1/4 to 7/16 inches thick. Drain
piping must be properly insulated to prevent damage to the indoor unit and the ceiling.
Test the condensate drain piping system for leaks 24 hours after installation is complete. Use only water to test the drain piping.
Outdoor Units
See pages 56 to 61 for information in reference to outdoor unit placement and condensate drainage.
Indoor Units
Ceiling-Concealed Ducted indoor units include a factory-installed drain pump. Depending on the location of the indoor unit, condensation can
be drained directly to the outside of the building, or tied into a drainage piping system.
Table 46: Drain Piping Specications.
Indoor Unit
Drain Pipe Dia. (inches)
(External / Internal)
Drain Pump Drain Lift Height (inches)
Amount of Drainage (gpm)
(at 0.4 inches high)
Ceiling Concealed Ducted 1-1/4 / 1 Standard 27-9/16 0.106
Figure 62: Condensate Drain Piping Trap.
Models with drain pump
Models without drain pump
Polyethylene insulation 10t
PVC drain pipe
Metal clamp
Drain pan
Thermal insulation(bend area)
Flexible drain hose
Thermal insulation (drain pipe area)
Flexible hose
Drain pump
PVC elbow
PVC
Max.
31-1/2 inches
11-13/16 inches or less
Common drain pipe
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