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FORM QCC3-EG1 (517)
Selection Data (Cont'd)
OIL TRAPS
All horizontal suction lines should be pitched at least 1/4" per foot (2 cm/m) in the direction
of the refrigerant flow to aid in the return of oil to the compressor. All suction lines with a
vertical rise exceeding 3 feet (.91 meters) should have a "P" trap at the bottom and top
of the riser. Suction lines with a vertical rise exceeding 25 feet (7.6 meters) should be
trapped every 15 feet (4.6 meters).
REFRIGERANT CHARGE
The condensing unit is charged with a dry nitrogen holding charge. The remaining operat-
ing charge for the condensing unit, evaporator coil, and refrigerant piping must be weighed
in after all refrigerant piping is installed, leak checked, and evacuated. Final adjustment of
refrigerant charge should be verified by subcooling values (refer to section on Pre-Startup
for checking subcooling).
REFRIGERANT PIPING REFERENCE
For more details, refer to ASHRAE Refrigeration Handbook, Chapter 2.
TABLE 1 - FITTING EQUIVALENT LENGTHS*
QCC3
3/4" (19mm)
7/8" (22mm)
1-1/8" (29mm)
1-3/8" (35mm)
1-5/8" (41mm)
2-1/8" (54mm)
2-5/8" (67mm)
*Copper Fitting Equivalent Lengths
TABLE 2 - MISCELLANEOUS LIQUID LINE PRESSURE DROPS
SOLENOID VALVE
FILTER/DRIER
SIGHT GLASS
TABLE 3 - REFRIGERATION PIPING CHARGES
R-410A SUCT @ 36 DEG LIQ @ 105 DEG
INSIDE
SIZE
DIAMETER
1-3/8
1.3
1-5/8
1.5
2-1/8
2.0
2-5/8
2.5
3/4
0.7
7/8
0.8
1-1/8
1.0
1-3/8
1.3
16
SHORT RADIUS ELL
6.5ft. (2m)
7.8 ft. (2.4m)
2.7ft. (0.8m)
3.2 ft. (1m)
3.8 ft. (1.2m)
5.2 ft. (1.6m)
6.5 ft (2.0m)
2-3 PSI (13.8 - 20.7kPa)
2-3 PSI (13.8 - 20.7kPa)
SUCTION LINES
DENSITY
CU FT
LB/CU
FT
0.0
2.1
0.0
2.1
0.0
2.1
0.0
2.1
LIQUID LINES
0.0
60.9
0.0
60.9
0.0
60.9
0.0
60.9
LONG RADIUS ELL
4.5 ft.(1.4m)
5.3 ft (1.6m)
1.9 ft. (0.6m)
2.2 ft. (0.7m)
2.6 ft. (0.8m)
3.4 ft. (1m)
4.2 ft. (1.3m)
0.5PSI (3.4 kPa)
OZ./FT.
GRAMS/30 CM
0.3
8.1
0.4
11.5
0.7
20.0
1.1
30.9
2.4
66.8
3.3
92.8
5.6
158.3
8.5
241.1
QUANTECH
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