Use and Care Manual

mrcool.com
Outdoor Unit Installation
If you are installing the unit on a wall-mounted
bracket, follow these steps:
1. Mark the position of the bracket holes based on
the dimensions in the Mounting Dimensions
chart on the previous page.
2. Pre-drill the holes for the expansion bolts.
3. Clean dust and debris away from the holes.
4. Place a washer and nut on the end of each
expansion bolt.
5. Thread expansion bolts through the holes in the
mounting brackets. Then, put the mounting
brackets in position and hammer the expansion
bolts into the wall.
6. Check that the mounting brackets are level.
7. If the feet of the outdoor unit have rubber pads
already installed, and you’re using a MRCOOL
®
wall-mounted bracket, remove them before
attempting to mount the condenser to the
bracket. The mounting bracket has rubber
isolating pads on it that will take the place of
these.
8. Carefully lift the unit and place its mounting feet
on the brackets.
9. Then, bolt the unit firmly to the brackets.
Page 35
Before installing a wall-mounted unit, make
sure that the wall is made of solid brick,
concrete, or a similarly strong material. The
wall must be able to support at least 4
times the weight of the unit.
CAUTION
TO REDUCE VIBRATION OF WALL-MOUNTED
OUTDOOR UNIT
If allowed, you can install the wall-mounted
unit with rubber gaskets to reduce vibration
and noise.
Step 4: Connect Line Set to Outdoor Unit
In this step, you will connect the coiled end of the
line set to the outdoor condenser. You will need
the wrenches you previously used when
connecting the line set to the indoor unit.
1. Remove the water tray from the side of the
outdoor unit as shown below in Fig. 6.6.
NOTE ON AIR HANDLER CONNECTION ORDER
WITH A MULTI-ZONE CONDENSER
If you’re installing the cassette as part of a
multi-zone system with other air handlers,
there is a guideline to which respective port
on the condenser each air handler should be
connected to. The line set connection ports on
a multi-zone condenser are labeled A,B,C,D,E,
etc. The capacities of the air handlers you use
will determine which ports they should be
connected to. The largest capacity air handler
should be connected to the “A” port. Then,
the next largest capacity air handler should
be connected to the “B” port and so on. To
distinguish the connectors to be connected to
the indoor units and outdoor unit, the
refrigerant pipe connectors have been
labeled “A”, “B”, “C”, “D”, and “E”. Ensure the
marks on the connectors match the indoor
units and outdoor unit respectively during
connection. If this guideline is not followed, it
could affect the heating/cooling performance
of the unit and/or system.
2. Do not remove the plastic seals from the
outdoor unit piping connectors and
corresponding refrigerant pipes (line set to be
attached) until immediately before you connect
them.
3. Align the refrigerant pipes so they line up with
the corresponding valves and have enough slack.
NOTE: The refrigerant pipes must be
connected to the valves with as little stress
as possible. Unscrew the plastic seals and place
the screw connector of the refrigerant line just
onto the threads of the outdoor unit, tightening
the first few threads by hand.
NOTE: Ensure the adapters attached to the
outdoor valves have been tightened properly
before attempting to connect the line set.
Fig. 6.6