Instructions / Assembly

Page 29 mrcool.com
Step 3: Connect Line Set to Indoor Unit Refrigerant Pipe Connectors (both ends):
IMPORTANT:
IMPORTANT:
Before you continue, it is essential that you read
the following instructions fully and carefully.
3.2 IMPORTANT INFORMATION
PLEASE READ FULLY BEFORE PROCEEDING TO NEXT STEP
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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.
• Follow the detailed instructions for connecting the
line set to the indoor unit and outdoor units. We can
only provide a warranty 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 foreign
bodies 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-type) 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.
3.3 Connecting the Quick Connect
®
Line Set to
the piping from indoor unit
1. Do not remove the plastic seals of the piping coming
from the indoor unit, or the appropriate 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 corresponding pipes they are to be
connected to.
2. Align the refrigerant pipes correctly, making sure the
dimensions of the connecting refrigerant pipe
match. Unscrew the seals and place the screw
connector of the line set just onto the threads of the
piping from the indoor unit and tighten the first few
threads by hands.
Refrigerant Piping Connection
NOTE: Depending on the capacity rating of your unit,
(12K, 18K, 24K, 36K) 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 that can be adjusted to fit the size
each step requires.
3.1 Tools needed
Opened-ended wrench sizes needed
(1x of each of these)
12K & 18K 24K & 36K
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
(adjustable-type)
Wrenches
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.
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