Instructions / Assembly

Page 27 mrcool.com
Indoor Unit Installation
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 Fig. 5.14 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 cassette. Using two
appropriately 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 arrow, 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 previous steps for the other connector.
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)
1
2
Line Set Connector Torque Specifications
Fig. 5.14