Installation Guide

Page 17 mrcool.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 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.
Double-check that all items are bundled in
accordance with Fig. 4.8
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
6. Feed the signal wire through this slot, from the
back of the unit to the front.
7. Facing the front of the unit, match the wire
colors with the labels on the terminal block,
connect the u-lug and firmly screw each wire
to its corresponding terminal.
DO NOT MIX UP LIVE AND NULL WIRES
This is dangerous, and can cause the air
conditioning unit to malfunction.
8. After checking to make sure every connection
is secure, use the cable clamp to fasten the signal
cable to the unit. Screw the cable clamp down
tightly.
9. Replace the wire cover on the front of the unit,
and the plastic panel on the back.
Step 7: Wrap piping and cables
Before passing the piping, drain hose, and the signal
cable through the wall hole, you must bundle them
together to protect them, insulate them, and save
space.
1. Bundle the drain hose, refrigerant pipes, and
signal cable according to Fig. 3.12.
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. 4.8
THE WIRING CONNECTION PROCESS MAY
DIFFER SLIGHTLY BETWEEN UNITS.
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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