Johnson Controls R SERIES Installation And Maintenance Manual page 31

2.3.9 Installing the Condensate Pipes
(1) Insert the condensate pipe to the drain outlet of the unit and then tighten the clamp securely with
tape.
(2) Connect the extension condensate pipe to the condensate pipe and then tighten the clamp with
tape.
Tighten the clamp until the screw head is less then 4mm
(1/8inch) from the hose.
Metal clamp (accessory)
Insulation sponge (accessory)
(3) When unifying multiple condensate pipes, install the pipes as in Figure 3-1-51. Select converging
condensate pipes whose gauge is suitable for the operating capacity of the unit (take the cassette
type unit for example).
(4) When the condensate hose cannot keep a sufficient gradient, it is necessary to fit a riser
pipe (field supplied) to it.
(5) If the air flow of indoor unit is high, this might cause negative pressure and result in return suction
of outdoor air. Therefore, U-type water trap should be designed on the drainage side of each indoor
unit (Figure 3-1-52).
(6) Install one water trap for each unit.
(7) Installation of water trap should consider easy cleaning in the future.
Figure 3-1-52
Insulate the pipe clamp and the condensate hose
using heat insulation sponge.
Metal clamp
Condensate hose (accessory)
Grey tape (accessory)
Figure 3-1-51
Figure 3-1-53
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Figure 3-1-54