Use and Care Manual

IMPORTANT:
Page 26mrcool.com
Indoor Unit Installation
Step 7: Connect Line Set to Cassette
In this step, you will align and connect the
pre-charged line set to the ceiling cassette.
TOOLS NEEDED:
1. Do not remove the plastic seals of the piping
connection points of the cassette, or the
corresponding line set connector, until
immediately before they are to be connected. The
plastic seals on each of the connectors should be
color-coded to match the seals of the cassette
connection points they are to be connected to.
2. Align the quick connectors at the end of the line
set which was routed to the ceiling hole with the
adapters of the cassette. Ensure the dimensions
of the connecting refrigerant pipe match. Unscrew
the seals and place the screw connector of the
line set onto the threads of the piping connection
point of the cassette and tighten the first few
threads by hands.
NOTE ON WRENCH SIZES
Depending on the capacity rating of your
unit, (18K, 27K, 36K, 48K) the wrench sizes
needed will vary, refer to the table below
(the unit uses metric sizes, the standard sizes
listed are approximations). Based on the
availability of wrenches in some of the sizes
needed, the recommended method is to use
crescent wrenches (adjustable-type) that can
be adjusted to fit the size each step requires.
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Opened-ended wrench sizes needed, based on
condenser capacity (1x of each of these).
18K & 24K 36K & 48K
3/4” / 19 mm 3/4“ / 19 mm
7/8” / 22 mm 15/16“ / 24 mm
15/16” / 24 mm 1“ / 26 mm
1” / 26 mm 1-1/8” / 29 mm
1-1/4” / 31 mm
1x HVAC Torque Wrench (if available)
1x Allen key, 5 mm
1x Phillips-head screwdriver
1x leak-detection spray or a soapy water
solution (liquid detergent/mix, applied by brush
or spray bottle)
Or 2x
Crescent
Wrenches
• Follow the detailed instructions for
connecting the line set to the indoor unit and
outdoor units. A warranty will only be
provided if the line set is installed correctly as
described in the instructions.
• To prevent leaks, ensure that the Quick
Connect
®
connectors are free of dirt. Moisture
or dirt will adversely affect the function of
the connectors and could lead to a risk of
refrigerant loss (not covered by the
warranty).
• Only install the line set outdoors in dry
weather.
• The line set must not be plastered over after
being installed.
• Always wear work gloves and goggles and use
caution when handling refrigerant. Please
make sure that refrigerant is never allowed
to enter the environment. Improper handling
of refrigerant may be harmful to your health.
• The equipment must never be operated
without the line set connected, otherwise the
equipment will be damaged immediately.
• Quick Connect
®
line set connections must
only be tightened using the appropriate
open-ended or crescent (adjustable)
wrenches.
DO NOT remove the sealing caps and
stoppers from the line set or valves until
immediately before they are to be
connected.
DO NOT smoke during the installation.
WARNING
Refrigerant Pipe Connectors (both ends):
If the screw connections are tightened with too little
torque, they will leak. If they are tightened with too
much torque, the screw connections could suffer
damage. Please refer to the torque requirements
section for more information. If you do not feel
confident connecting the line set connectors yourself,
it is imperative that you contact the MRCOOL
®
customer service team or an HVAC professional.
Pat. https://mrcool.com/mrcool-patents/
IMPORTANT:
The line sets are designed to only be installed
once. The seal within the line set cannot be
guaranteed if they are installed more than
once. This will void the warranty. They also
contain a compression fitting to seal and do
not require a thread sealant (Teflon tape, etc.).
Using a sealant may actually cause the
connection to leak over time.