Gree GTH36K3FI - Page 80

U-Match Series DC Inverter Service Manual
77
1.3.9 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.
Tighten the clamp until the screw head is less
then 4 mm from the hose.
①- Metal clamp
②- Drain hose (accessory)
③- Grey tape (accessory)
Insulate the pipe clamp and the drain hose
using heat insulation sponge.
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)
Figure 3-1-51
(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)
(6) Install one water trap for each unit.
(7) Installation of water trap shall consider easy cleaning in the future.
Figure 3-1-52 Figure 3-1-53 Figure 3-1-54
(8) Connection of drainage branch pipe to the standpipe or horizontal pipe of drainage main pipe