Use and Care Manual

Page 30mrcool.com
Refrigerant Piping Connection
TORQUE REQUIREMENTS
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: Torque ratings 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 overtighten the connector, and that once the lines have been fully connected, you follow
the steps to check for leaks. If you do not feel comfortable attempting this, please contact a qualified
HVAC technician.
3. Using the image below as a guide, and the steps
outlined in this paragraph, you will now tighten the
nuts of the screw connectors of the Quick
Connect
®
line set to the indoor 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,” as shown in the
image below. Now, turn the wrench marked “2” in
the direction of the rotational arrows, as shown,
while holding the other wrench in place. 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, as listed in the table to the right (based on
pipe/coupling size).
* If an HVAC torque wrench is NOT available:
Using two wrenches you used to tighten the
connector, once the connector is snug, turn the
wrench slightly beyond that point to torque the
connector,but do not overtighten it.
4. Repeat the same process for the second line.
1
2
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
(on
connector)
Coupling
Size
inch (millimeter)
Tightening
Torque
lb-ft (N-m)