York MILLENNIUM YCUL0045SC, Installation Operation & Maintenance

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YORK INTERNATIONAL
FORM 150.63-NM2
15
1
TABLE 5 – REFRIGERANT LINE PRESSURE DROPS (ENGLISH)
1 33
2-1/8 2.7 2970
11
7/8 8.9
211
5 2-5/8 1.0 1980 1-1/8 2.5
2 26
5
2-1/8 1.8 2340
9
3/4 12.4
5 2-5/8 .6 1560 7/8 5.7
1 33
2-1/8 2.7 2970
11
7/8 8.9
235
5 2-5/8 1.0 1980 1-1/8 2.5
2 33
2-1/8 2.7 2970
11
7/8 8.9
5 2-5/8 1.0 1980 1-1/8 2.5
1 39
2-1/8 3.7 3510
13
7/8 12.1
255
5 2-5/8 1.3 2340 1-1/8 3.4
2 33
2-1/8 2.7 2970
11
7/8 8.9
5 2-5/8 1.0 1980 1-1/8 2.5
1 39
2-1/8 3.7 3510
13
7/8 12.1
275
5 2-5/8 1.3 2340 1-1/8 3.4
2 39
2-1/8 3.7 3510
13
7/8 12.1
5 2-5/8 1.3 2340 1-1/8 3.4
SUCTION LINE LIQUID LINE
MODEL COPPER 2 PRESSURE
VELOCITY
4 NOMINAL COPPER 3 PRESSURE
NUMBER
SYSTEM
1
NOMINAL
TYPE L DROP
@ NOMINAL
TONS TYPE L DROP
YCUL00
NUMBER TONS
INCHES O.D. PSI/100 FT.
CAPACITY IN
UNLOADED INCHES O.D. PSI/100 FT.
FPM
Notes:
1. Based on R-22 at the nominal capacity of the unit or system, an ambient temperature of 95°F (35°C) and a suction temperature of 45°F
(7.2°C).
2. Suction line sizes were calculated based on a nominal maximum pressure drop to 3 PSI/100 ft. (20.7 kPa/30.5 m). 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 0.5 PSI/foot (3.4 kPa/
30 cm) 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 40 PSI (276 kPa) based on 15°F (8.3°C) 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 40 feet (12 meters) in length. The field connections
sizes are 7/8" for the optional factory mounted hot gas bypass valve.
Hot gas bypass is only available for refrigerant system number 1.