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Refrigerant Tubing
Tubing Length & Elevation
Copper tubing to connect the indoor and outdoor units is sup-
plied by others or it can be ordered from the factory. See
Table 2 and Figure 5 for requirements.
Table 2: Refrigeration Tubing Requirements
Model
20
Maximum Length, ft.
49'
Max. elevation, ft, H
26'
Max. number of bends
10
Liquid tube size - OD
1/4"
Gas tube size - OD
5/8"
Note: The refrigerant pre-charged in the outdoor unit is for tubing length up to 25
ft. See Table 7 for additional R-22 refrigerant required on runs longer than 25 ft.
Figure 5. Tubing length and elevations
Outdoor Unit
Outdoor Unit
Elevation
Tubing Preparation
•
Do not use contaminated or damaged copper tubing. Do
not remove plastic, rubber plugs or brass nuts from the
valves, fittings, tubings and coils until you are ready to
connect suction or liquid line into valves or fittings.
•
If any brazing work is required, ensure that the nitrogen
gas is passed through coil and joints while the brazing
work is done. This will eliminate soot formation on the
inside wall of the copper tubing.
•
Cut the copper tubing with a tube cutter (See Figure 6).
Page 8
25
30
40
50
49'
115'
115'
115'
26'
49'
49'
49'
10
10
10
10
3/8"
3/8"
3/8"
3/8"
5/8"
5/8"
3/4"
3/4"
Indoor Unit
Elevation
Indoor Unit
•
Remove burrs from cut ends by holding tubing down-
wards to prevent metal chips from entering the tubing.
•
Slide the flare nuts, for both the indoor unit and outdoor
unit onto the copper tubing.
•
Flare the tubing as shown in Figure 6 and Table 3.
•
The flare must be even and not cracked or scratched.
Figure 6. Cutting and Flaring Tube
Cutting Copper Tube
1/4 Tube
Copper Tube
Flaring Tool
Table 3: Tube Flaring Dimensions
Tube Diameter - OD
Inch
1/4
3/8
5/8
Tubing Connection To Units
•
Connect the copper tubing to both the indoor and outdoor
units (See Figure 7).
•
Torque each flare nut to specifications (See Table 4).
•
Cover both tubes individually with 3/8" wall foam insul-
lation.
Figure 7
Unit Fitting
Table 4:
Tube Size (in.)
1/4
3/8
5/8
See Table 3
X
X (in.)
Imperial
Rigid
.051
.028
.063
.039
.087
.067
Flared Tube
Flare Nut
Torque (ft./lb.)
13.3
31.0
48.0
IM 820
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