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035-15806-004 Rev. A (1000)
INSTALLATION
OUTDOOR UNIT
After the site has been selected a suitable equipment pad
should be provided. The suitable equipment pad should not
come in contact with the foundation or side of the structure
because sound may be transmitted to the residence. The
concrete pad need not be any larger than the outside dimen-
sions of the outdoor unit. The pad should be located far
enough away from the structure so the outside unit is not
closer than its minimum distances. See Figure 1. Set the out-
side unit upon the pad with care to avoid damage.
Do not remove the protective caps or plugs from the
unit refrigerant connections until the refrigerant lines
are run and ready for final connection. If this proce-
dure is not observed, dirt and other particles will get
into the system and plug various orifices and small
tubes.
INDOOR UNITS
Install the indoor coil in the furnace or air handler according to
the installation instructions packed with each component.
REFRIGERANT LINE
The following steps are very important when setting up a
refrigerant system and need to be followed completely to
ensure that a strong, flexible and leak tight system is
obtained.
The installation of the copper refrigerant tubing must be done
with care to obtain reliable, trouble-free operation.
1.
Selection of proper refrigerant tubing grade and size.
2.
Refrigerant line routing, cutting and fitting.
3.
Proper preparation of joint connections.
4.
Reassembling, cleaning and brazing the joint connec-
tions.
5.
Insulating the vapor line.
6.
Connecting the refrigerant lines to the indoor coil and
outdoor unit.
7.
Pressure leak test all joints.
8.
Evacuate refrigerant lines and indoor coil.
9.
Charging refrigeration system (if the line length is other
than 15 feet.) See Table 2.
Table 2: REFRIGERANT LINE CHARGES
Liquid OD
Vapor OD
3/8"
3/8"
3/8"
3/8"
1/2"
4
R-22 Charge, OZ/FT
5/8"
0.66
3/4"
0.68
7/8"
0.70
1-1/8"
0.76
1-1/8"
1.26
Use only ACR grade copper tubing and keep ends sealed
until joints are made.
The correct diameters of the refrigerant lines are listed on the
unit nameplate.
For best performance, select routing of refrigerant lines for
minimum distance and fewest number of bends.
Determine the path that the refrigerant lines will follow.
Starting at either the indoor coil or the outdoor unit refrigerant
line connections, carefully measure, cut de-burr and fit cop-
per refrigerant lines along the path previously determined.
NOTE:
If it is necessary for bends to be formed in the vapor
line, the radius should not be less than 12 inches.
Cut ends of the copper tubing square.
Remove all burrs from tubing with a reamer, file or de-burring
tool.
Slope tubing towards the outdoor unit.
When the indoor coil is above the outdoor unit the vapor line
should be sloped toward the outdoor unit with a fall of least 1/
4 inch per 5 FT.
When the outdoor unit is above the indoor coil the horizontal
runs should be sloped toward the outdoor unit as described
above.
INSULATION OF VAPOR LINE
Insulate vapor line with 3/8" (or that required by local code)
closed cell insulation.
Slide tubing insulation onto the vapor line so that it is covered
completely from the indoor coil to the outdoor unit. Be sure
that the tubing is capped before sliding on insulation.
It is not necessary to insulate the liquid line.
NOTE:
In areas of extreme temperatures and humidity,
additional insulation may be required to prevent excessive
condensation and loss of capacity.
Do not insulate liquid line and vapor line together. Liquid line
should not be in contact with the vapor line. See Figure 2..
Sheet Metal Hanger
Liquid
Line
Incorrect
Correct
FIGURE 2 : INSULATION OF VAPOR LINE
Tape
Insulated Vapor Line
Unitary Products Group
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