User Guide
Page 23
mrcool.com
Indoor Unit Installation
Step 6: Connect drain hose
By default, the drain hose is attached to the left-hand 
side of unit (when you’re facing the back of the unit). 
However, it can also be attached to the right-hand side. 
NOTE ON DRAIN HOSE PLACEMENT 
Make sure to arrange the drain hose according 
to Fig. 5.5a.
DO NOT kink the drain hose.
DO NOT create a water trap.
DO NOT put the end of drain hose in water 
or a container that will collect water.
ENSURE UNUSED DRAIN HOLE IS PLUGGED
To ensure proper drainage, the drain hose must exit 
the unit on the same side as the refrigerant piping.
1.
Wrap the connection point firmly with included tape 
to ensure a good seal and to prevent leaks.
2.
For the portion of the drain hose that will remain 
indoors, wrap it with included insulation material to 
prevent condensation.
3.
Remove the air filter and pour a small amount of 
water into the drain pan to make sure that water 
flows from the unit smoothly.
4.
To prevent unwanted leaks, be sure that the 
factory installed rubber plug is in the unused 
drain hole.
Fig. 5.5a
Fig. 5.5b
Fig. 5.5c
Fig. 5.5d
Make sure there are NO
kinks or dents in the 
hose to ensure proper 
drainage.
NOT CORRECT
Dents in the drain hose 
will create water traps.
NOT CORRECT
Kinks in the drain hose 
will create water traps.
NOT CORRECT
DO NOT place the end 
of the drain hose in 
water or in containers 
that collect water. 
This will prevent 
proper drainage.










