Comfortstar Service manual for 13seer Cooling Only Condensing
7
combination of the unit size and the maximum refrigerant line length. Refrigerant Line Sizing
Refrigerant Line Length (Ft)
Unit Size
0 – 50
50 – 100
100 – 250
(Ton)
Line Outside Diameter (In)
Suction
Liquid
Suction
Liquid
Suction
Liquid
1.5
5/8
3/8
7/8
3/8
/
/
2.0
5/8
3/8
7/8
3/8
/
/
2.5
3/4
3/8
7/8
3/8
/
/
3.0
3/4
3/8
3/4
3/8
7/8
3/8
3.5
7/8
3/8
1-1/8
3/8
1-1/8
3/8
4.0
1-1/8
1/2
1-1/8
1/2
1-1/8
1/2
5.0
1-1/8
1/2
1-1/8
1/2
1-1/8
1/2
Table 3
R-22 Cooling Capacity Loss For Various Line Lengths &Tube Diameters
Cooling Capacity loss(%) at Total Equivalent Line Length(ft.) Refer to
Long Line Application Guideline to calculate equivalentlength
Model
Size
Liquid
line(in.)
Acceptable
Vapor Line
Size(in.)
Standard
Application
Long line Application (Requires Accessories)*
25'
50'
80'
81'
100'
125'
150'
175'
200'
225'
250'
18
0
1
1
1
1
/
/
/
/
/
/
24
5/8
0
1
1
1
2
/
/
/
/
/
/
30
0
1
1
1
1
/
/
/
/
/
/
36
1
2
3
3
4
5
5
6
7
8
9
42
3/8
3/4
1
2
4
4
5
6
7
8
10
11
12
48
7/8
1
2
2
2
3
4
5
5
6
7
8
60
1/2
1-1/8
1
2
3
3
5
6
7
8
9
10
11
Table 4
The factory charge is sufficient for 25 feet of standard liquid line. For longer or shorter liquid line
lengths, adjust the charge as follows:
3/8" Liquid line +/- 0.6 oz. Per foot
1/2" Liquid line +/- 0.8 oz. Per foot.
Vertical Separation between Indoor and Outdoor Units
Maximum allowable vertical separations
between indoor and outdoor units are 100' when the indoor unit is below the outdoor unit , and 60' when the
indoor unit is above the outdoor unit.
To ensure good oil return to the compressor when the indoor unit is below the outdoor unit,
suction line oil trap should be used as illustrated in Fig. 5.
Tubing Connections
! CAUTION
-
Use extreme caution in removing the caps from the suction and liquid line fittings, as
there is pressure present. A fitting is on the liquid line to remove pressure.
! CAUTION
-
Condensing units are charged with refrigerant. Condensing unit liquid and suction valves are
closed to contain the charge within the unit. Do not force the valve stem against the retaining ring. If the
valve stem is backed out past the retaining ring, system pressure could force the valve stem out of the valve
body and possibly cause personal injury.
