950-0265revC - 10 - November 30, 2020
Line set
connections
under the
brass caps
Service
Port
Installation (CONT’D).
CAUTION!
In cold climates, make sure that the drain hose is as vertical as possible to ensure swift water drainage. If water
drains too slowly, it can freeze in the hose and flood the unit.
Step 9
Refrigerant Line Set Piping
Interconnecting line set between the outdoor unit and the Indoor unit must have both
refrigerant lines insulated as condensing device is located in the outdoor unit.
Gently bend the line set stubs from the indoor unit to the desired location. Using (2)
properly sized wrenches remove the flare nuts from the Indoor unit line stubs.
The indoor unit is filled with a dry gas, check for release of this to ensure that no leaks
are present. Use a small amount of vacuum pump oil on the male flare threads to ease
installation.
Connect the line set to the stubs. Using 2 wrenches, 1 on the male & 1 on the female,
tighten the flare nuts.
DO NOT INSTALL A LIQUID LINE SIGHT GLASS OR FILTER DRIER IN THE SYSTEM.
Run the line set to the outdoor unit. Avoid tight bends and kinking the lines. It is
not recommended to braze line sets together or to the unit connections.
If line set length is in excess of that required, cut the pipes a little longer than
measured distance. Completely remove all burrs from the cut cross section of
pipes. Follow standard flaring procedures and use proper flaring tools for a leak
proof connection.
If a flared section is defective, cut it off and follow standard flaring procedures again.
See caution note page 4.
Align the center of the piping flare to its’ mating connector, then screw on the
flare nut by hand and then tighten the nut with a spanner and torque wrench.
Note
: Exceeding the tightening torque will damage the flare surface.
Step 10
Evacuation
After connecting the indoor and outdoor units, evacuate the air from the line set and the indoor unit.
Gauges can now be attached to the service port - SERVICE PORTS HAVE A 5/16
” CONNECTION TO
GAUGES.
Use caution to ensure that the proper size fittings are used
when connecting.
Once the gauges are attached the line set can be leak
checked using nitrogen at 300 PSIG. Evacuate the unit
down to a minimum of 500 Microns, break vacuum with
nitrogen to further leak check.
Re-evacuate the system down to 500 Microns or lower. This
is an R410A system, it is essential that a deep vacuum be pulled on the system to remove all traces of
moisture. (See page 21 for The Importance of a Deep Vacuum).
Tightening Torque Table
1/4
”
11-15
Ft-lbs
3/8
”
25-30
Ft-lbs
1/2
”
36-42
”
Ft-lbs
5/8
”
54-58
Ft-lbs
