INDOOR UNITS
Install the indoor coil in the furnace or air handler according to
the installation instructions packed with each component.
REFRIGERANT LINES
The following steps are very important when setting up a
refrigeration 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 connections
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.
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 copper
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 at 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.
RE-ASSEMBLING, BRAZING AND CLEANING
OF JOINT CONNECTIONS
CAUTION: When using hard solder, an inert gas such as dry
nitrogen must be introduced and permitted to flow
through tubing during brazing to displace air and
prevent oxidation.
Remove the Schrader valve cores from the service valves.
Remove the plugs from the service valve field tubing connec-
tions. Clean the joints to be brazed.
NOTE: Do not overheat the connection to be brazed as this
can cause improper flow of solder, resulting in a weak
and leaking joint. Never apply heat directly to face of
fitting.
When brazing copper tubing it is very important to preheat the
entire joint before applying the solder. This is done by sweeping
the flame steadily and evenly around the fitting, to bring both
fitting and tubing up to equal temperature before applying the
solder.
Reassemble groups of tubing and fittings, brazing several
joints instead of one joint at a time. This reduces the chance
for error in the alignment of the assembly. Replace Schrader
valve cores. DO NOT OPEN SERVICE VALVES AT THIS TIME.
NOTE: Do not heat solder by direct contact with flame of the
torch.
INSULATION OF VAPOR LINE
Insulate vapor line with 3/8" 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, unless it is subject
to excess heat in an uninsulated area.
NOTE: In areas of extreme temperatures and humidity, addi-
tional 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.
REFRIGERANT LINE SUPPORT
Refrigerant lines should be supported in a way that no dips or
sags occur. We recommend four feet between supports. If
refrigerant lines are to be attached to the home structure, care
should be taken to eliminate the transmission of vibrations.
Braze refrigerant lines to indoor coil and outdoor unit. Attach
the refrigerant lines to the indoor coil first. Remove plugs from
the indoor coil, then clean joints to be brazed. Braze refrigerant
lines to the indoor coil. Attach refrigerant lines to the outdoor
unit.
LIQUID OD
VAPOR OD
R-22 CHARGE, OZ/FT
3/8"
5/8"
0.66
3/8"
3/4"
0.68
3/8"
7/8"
0.70
3/8"
1-1/8"
0.76
TABLE 2 - REFRIGERANT LINE CHARGES
550.46-N1YI
Unitary Products Group
3
