Gree MULTI18HP230V1CO Installation Manual page 19

TWD-1518 multi21+ install_printer.qxp_Layout 1 3/22/17 9:41 AM Page 37
PIPING INSTALLATION
Indoor Drain Piping
The indoor wall unit uses a gravity drain system. There is no internal condensate pump. The drain
hose must slope downward with no kinks, raises or fluctuations.
1. Connect the field supplied drain hose to the outlet
pipe of indoor wall unit. A field supplied transition or
adapter may be required. Secure connection with a
field supplied hose clamp.
2. On the interior portion, apply pipe insulation to the
entire drain line and joints to prevent sweating.
3. The through-wall hole for the drain hose must be lower than
the indoor wall unit drain outlet for a functional gravity drain system.
4. Install field supplied drain hose with a downward slope from the Indoor wall unit
drain outlet to the drain hose outlet.
Correct
The drain hose The drain hose
slopes downward. cannot raise upward.
5. Route the condensate drain hose in the safety location to
dispose of the condensate water.
NOTE: A condensate pump accessory (sold separately) is recommended for the
indoor unit when adequate line pitch cannot be provided for gravity drainage.
Outlet pipe
Incorrect Incorrect
The drain hose
cannot raise upward.
OUTDOOR UNIT INSTALLATION
Outdoor Unit Dimensions
Drain hose
Drain hose
30K Unit
Insulate
drain hose
36K and 42K Unit
24
36.2 14.6
38.4 17.3
15.7
24.0
40.0
14.3
42.5 17.3
24.8
14.8
31.0
43.4
17