Gree U-MATCH Series Service Manual page 68

Extension drain piping
(commercially available)
1.2.9 Installing the Drain Pipes
(1) Insert the drain pipe to the drain outlet of the unit and then tighten the clamp securely with tape.
(2) Connect the extension drain pipe to the drain pipe and then tighten the clamp with tape.
During the installation, distance from soft drain pipe
to the gasket is 15±3mm when the bolt is tightened.
It is not allowed to apply PVC or other related glue in
the joints of two ends of drain pipe.
①. Metal clamp (accessory)
②. Insulation sponge (accessory)
(3) When unifying multiple drain pipes, install the pipes as Figure 3-1-51. Select converging drain
pipes whose gauge is suitable for the operating capacity of the unit (take the cassette type unit for
example).
(4) When the drain 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 shall be designed on the drainage side of each
indoor unit (Figure 3-1-52).
Insulating tube
(commercially
available)
Figure 3-1-50
15± 3mm
T-joint converging drain pipes
Figure 3-1-51
U-Match Series DC Inverter Service Manual
Insulating tape
(accessory)
1
Insulate the pipe clamp and the drain hose using
heat insulation sponge.
①. Metal clamp
②. Drain hose (accessory)
③. Grey tape (accessory)
T-joint converging drain pipes
65
Indoor unit
drain hose
2
3