Installation Guide
Page 24mrcool.com
Indoor Unit Installation
DO NOT INTERTWINE SIGNAL CABLE WITH 
OTHER WIRES
While bundling these items together, do not 
intertwine or cross the signal cable with any 
other wiring.
2.  Using adhesive vinyl tape, attach the drain hose 
 to the underside of the refrigerant pipes.
3. Using insulation tape, wrap the signal wire, 
 refrigerant pipes, and drain hose tightly together. 
 See Fig. 5.7 for example. Double-check that all 
 items are bundled in accordance with Fig. 5.6.
DO NOT WRAP ENDS OF PIPING
When wrapping the bundle, keep the ends of 
the piping unwrapped. You need to access them 
to test for leaks at the end of the installation 
process (refer to Electrical Checks and Leak 
Checks section of this manual).
Step 8: Mount indoor unit
Step 7: Wrap piping and cables
Before passing the piping, drain hose, and signal 
cable through the wall hole, you must bundle them 
together to protect them, and tightly wrap them 
together with the provided tape.
1. Bundle the drain hose, refrigerant pipes, and
signal cable according to Fig. 5.6. 
DRAIN HOSE MUST BE ON BOTTOM
Make sure that the drain hose is at the bottom 
of the bundle. Putting the drain hose at the 
top of the bundle can cause the drain pan to 
overflow, which may lead to fire or water 
damage.
Indoor Unit
Space behind unit
Refrigerant piping
Drain hose
Signal wire
Insulation tape
Fig. 5.6
Fig. 5.7
If you installed new connective piping to the 
outdoor unit, do the following:
If you have already passed the refrigerant piping 
through the hole in the wall, proceed to Step 4.
Otherwise, double-check that the ends of the 
refrigerant pipes are sealed to prevent dirt or 
foreign material from entering the pipes.
Slowly pass the wrapped bundle of refrigerant 
pipes, drain hose, and signal wire through the 
hole in the wall.
Hook the top of the indoor unit on the upper 
hook of the mounting plate.
Check that unit is hooked firmly on mounting 
plate by applying slight pressure to the left and 
right-hand sides of the unit. The unit should not 
jiggle or shift.
Using even pressure, push down on the bottom 
half of the unit. Keep pushing down until the unit 
snaps onto the hooks along the bottom of the 
mounting plate.
Again, check that the unit is firmly mounted by 
applying slight pressure to the left and the 
right-hand sides of the unit.
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