Instructions / Assembly

Page 28mrcool.com
Indoor Unit Installation
Step 8: Check Line Set Connectors for Leaks
1. After connecting the line set to the cassette , you
will now need to check the piping connections for
leaks. You can do this by using leak detection
spray, or applying a soapy water solution (liquid
detergent/water mixture) to the connection via a
spray bottle or brush. If any bubbles begin to
form, that indicates there is a leak, and the
connection needs to be re-tightened. Tighten
the connection and recheck it for leaks. Refer to
Electrical and Gas Leaks Checks section of
this manual for more detailed information.
Step 9: Wrap Line Set Connections
After confirming the line set connections do not leak,
you will now wrap the connections to insulate them
and prevent sweating.
1. Tightly wrap each line set connector with the
supplied sound deadening pads as shown in the
image below.
2. Then, install the two provided insulation sleeves
over the sound deadening pads. Secure them
into place by wrapping adhesive tape around the
sleeve and installing the provided cable ties
around the ends to prevent water leakage.
IMPORTANT:
You will be asked to check for leaks at the
piping connections multiple times
throughout the installation, because the
pressures within the lines will change once
the unit is turned on and this could reveal
leaks not present during the initial check.
These checks are imperative to ensure
refrigerant is not escaping the system. When
checking for leaks, if any bubbles form, it
indicates the system has a leak and the
connector needs to be re-tightened. For more
information, please refer to the Electrical
and Gas Leak Checks section of the manual.
Step 10: Install Water Receiver Tray
After wrapping and insulating the line set
connections of the cassette, you will now install the
plastic water receiver tray beneath the connectors.
1. Position the water receiver tray beneath the
connectors and secure it into place with a ST4.
8*12 screw (refer to Fig. 5.15). NOTE: Two
ST4.8*12 screws are included, one of them is
to be kept as a spare.
Step 11: Install Drainpipe & Adapter
During normal operation, the cassette will produce
condensate (water). The purpose of the drainpipe is
to effectively drain the condensate produced so
that it will exit from the pipe to the exterior of the
house. The cassette includes the drainpipe adapter,
however, the drainpipe will need to be purchased
separately.
ST4.8*12 screw
Water
Receiver
Tray
• Insulate all piping to prevent
condensation, which could cause property
damage.
• If the drain pipe is bent or incorrectly
installed, water could leak and cause a
water-level switch malfunction.
• In HEAT mode, the outdoor unit will
discharge water. Ensure that the drain
hose is placed in an appropriate areas to
avoid water damage and slippage.
DO NOT pull the drain hose forcefully. This
could cause it to disconnect.
CAUTION
NOTE ON PURCHASING THE DRAINPIPE
The installation of this unit requires a
drainpipe which must be purchased
separately. It is recommended to use PVC
piping that has an exterior diameter of 3/4 in
(19.05 mm). This type of piping can be
obtained through a local hardware store or
dealer. You may also need to purchase PVC
elbows, connectors, and glue so the piping
can be run and installed as described in the
following pages of the installation manual.
Fig. 5.15
Adhesive
Tape
Cable Ties