Instructions / Assembly
mrcool.com Page 36
Outdoor Unit Installation
4. Using the first image below as a guide, starting
with the bottom screw connector, you will now
tighten the line set to the outdoor unit. Using
two appropriate sized open-ended wrenches
(depending on the dimensions of the connector),
or adjustable crescent wrenches, place one of
the wrenches on the nut marked “1”, and the
other wrench on the nut marked “2,” Now, turn
the wrench on nut “2” in the direction of the
rotational arrow, while holding the other wrench
in place, as seen in the first image below.
Continue to tighten the connector until snug.
NOTE: work quickly and make sure the
screw connectors do not become crooked as
you tighten them.
*If an HVAC torque wrench is available:
Once the connector is snug, using the torque
wrench, tighten the connector to the specified
torque rating, listed in the table to the right
(based on the pipe/coupling size).
*If an HVAC torque wrench is NOT available:
Using the two wrenches you used to tighten the
connector, once the connector is snug, then turn
the wrench slightly beyond that point to torque
the connector, but do not overtighten it.
5. Repeat the same process for the top screw
connector, using the second image below as a
guide. Then, repeat all of these steps for every
line set for all of the other air handlers (if
applicable).
1
1
2
2
IMPORTANT:
The coupling of the outdoor unit uses tapping
rings, if you disconnect and reconnect the
refrigerant pipes, it could cause it to leak.
This will also void the warranty.
NOTE ON EXCESS REFRIGERANT PIPING
Keep excess refrigerant hose coiled and
store it behind the condenser in a horizontal
position (flat with the ground).
1. Excessive force can break the connector or
damage the refrigerant piping. You must
not exceed the torque requirements
shown in the table below.
2. You can find the Outer Pipe Diameter
stamped (in inches) on the valve set of the
condenser. Refer to this when finding and
applying the torque values in the table
below.
3. Please note that there may be differences
in Torque Wrenches (i.e. automotive
torque wrench versus an HVAC torque
wrench) and that a socket style wrench
cannot be used in this installation.
NOTE: The torque specifications in the table
below are to be used if you have access to an
HVAC torque wrench. These are available for
purchase from online retailers. However, it is
possible to complete installation of
refrigerant line sets with conventional
open-ended/crescent wrenches. It is
imperative, however, that you not
over-tighten the connector, and that once the
lines have been fully connected, you follow
the steps to check the pipe connections for
leaks (Refer to the Electrical & Gas Leak
Checks section of this manual for more
information). If you do not feel comfortable
attempting this, please contact a qualified
HVAC technician.
TORQUE REQUIREMENTS
FA06
FA09
FA12
FA16
3/8 in
(9.5 mm)
1/2 in
(12.7 mm)
3/4 in
(19.1 mm)
1 in
(25.4 mm)
18-20 lb/ft
(24.4-27.1 Nm)
30-35 lb/ft
(40.6-47.4 Nm)
45-50 lb/ft
(61.0-67.7 Nm)
60-65 lb/ft
(81.3-88.1 Nm)
Stamp
(located on
connector)
Coupling Size
inch
(millimeter)
Tightening
Torque
foot pounds
(Newton meters)
Line Set Connector Torque Specifications