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TABLE 6 – REFRIGERANT LINE PRESSURE DROPS (METRIC)
MODEL
1
SYSTEM
NOMINAL
NUMBER
NUMBER
YCUL00
1
211
2
1
235
2
1
255
2
1
275
2
Notes:
1. Based on R-22 at the nominal capacity of the unit or system, an ambient temperature of 35°C (95°F) and a suction temperature of 7.2°C
(45°F).
2. Suction line sizes were calculated based on a nominal maximum pressure drop to 20.7 kPa/30.5 m (3 PSI/100 ft.). When calculating
suction line pressure drop for a specific application, it should be noted that system capacity decreases as suction line pressure drop
increases.
3. Liquid pressure drop (or gain) due to a vertical liquid line is not included in the tables and must be taken into account when determining
pressure drop (or gain) of the liquid line. The nominal value that must be included in the liquid line loss (or gain) is 3.4 kPa/30 cm (.5 PSI/
foot) of rise (or gain). To ensure a solid column of liquid refrigerant to the expansion valve, the total maximum pressure drop of the liquid
line should not exceed 276 kPa (40 PSI) based on 8.3°C (15°F) subcooled liquid. Vapor in the liquid line, even in small amounts, will
measurably reduce valve capacity and poor system performance will result. In addition, pressure loss for strainers, filter driers, solenoid
valves, and isolation valve or fittings are not included in this table, and must be taken into account.
4. Nominal Tons (KW) Unloaded is based on one compressor (per system) operating at design conditions.
5. Based on minimum compressor staging for the given pipe size, a double suction riser should be used to ensure proper oil return to the
compressor on all vertical suction risers. Oil returning up the riser moves up the inner surface of the pipe and depends on the mass
velocity of the refrigerant vapor at the wall surface to move the oil up the vertical rise.
6. Hot gas bypass lines are typically 7/8" for lines up to 40 feet and 1-1/8" for lines over 12 meters (40 feet) in length. The field connections
sizes are 7/8" for the optional factory mounted hot gas bypass valve. Note: Hot gas bypass is only available for refrigerant system
number 1.
Hot gas bypass is only available for refrigerant system number 1.
YORK INTERNATIONAL
COPPER
2
PRESSURE
TYPE L
DROP
kW
INCHES O.D.
kPa/30.5m
2-1/8
18.6
116
5
2-5/8
5
2-1/8
12.4
91
5
2-5/8
2-1/8
18.6
116
5
2-5/8
2-1/8
18.6
116
5
2-5/8
2-1/8
25.5
137
5
2-5/8
2-1/8
18.6
116
5
2-5/8
2-1/8
25.5
137
5
2-5/8
2-1/8
25.5
137
5
2-5/8
SUCTION LINE
VELOCITY
4
NOMINAL
@ NOMINAL
CAPACITY IN
UNLOADED
FPM
15.1
6.9
10.1
11.9
4.1
7.9
15.1
6.9
10.1
15.1
6.9
10.1
17.8
9.0
11.9
15.1
6.9
10.1
17.8
9.0
11.9
17.8
9.0
11.9
FORM 150.63-NM2
LIQUID LINE
COPPER
3
PRESSURE
kW
TYPE L
DROP
INCHES O.D.
kPa/30.5m
7/8
61.4
11
1-1/8
17.2
3/4
85.5
9
7/8
39.3
7/8
61.2
11
1-1/8
17.2
7/8
61.4
11
1-1/8
17.2
7/8
83.4
13
1-1/8
23.4
7/8
61.4
11
1-1/8
17.2
7/8
83.4
13
1-1/8
23.4
7/8
83.4
13
1-1/8
23.4
1
17
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