York YCUL0020, Installation, Operation And Maintenance Manual

Page: 36 / 178

JOHNSON CONTROLS
36
Form 150.63-NM9
Issue date: 5/20/2021
SECTION 4 – INSTALLATION
Table 3 - Miscellaneous Liquid Line Pressure Drops
*MISCELLANEOUS LIQUID LINE PRESSURE
SOLENOID VALVE 2 psi to 3 psi (13.8 kPa to 20.7 kPa)
FILTER/DRIER 2 psi to 3 psi (13.8 kPa to 20.7 kPa)
SIGHT GLASS 0.5 psi (3.4 kPa)
*Pressure drops or equivalent length values are approximate. If more precise value is desired, consult ASHRAE Refrigerant Handbook.
Refrigerant Piping Notes
1. Based on R-410A 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. Nominal Tons (kW) Unloaded is based on one compressor (beforesystem) operating at design conditions.
4. Based on minimum compressor staging for the given pipe size, a double suction riser should be used to ensure probeforeoil 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.
5. Hot gas bypass lines are typically 7/8 in. for lines up to 40 ft and 1 1/8 in. for lines over 40 ft in length (12 m). The field connections sizes
are 7/8 in. for the optional factory mounted hot gas bypass valve. Note: Hot gas bypass is only available for refrigerant system number 1.
6. For more information, refer to either the
YORK DX Piping Guide
(
Form 050.40-ES2
) or the
ASHRAE Refrigertion Handbook
.
Table 4 -
Refrigerant Line Connections
YCUL TONS
SYSTEM
NUMBER
COPBEFORETYPE L
INCHES OD
NOMINAL TONS
(kW)
UNLOADED
SUCTION LIQUID
0020EE 17.0 1 1-5/8 7/8 8.5
0024EE 20.1 1 1-5/8 7/8 10.1
0031EE 27.0 1 2-1/8 1-1/8 12.3
0035EE 30.9 1 2-1/8 1-1/8 15.5
0045EE 41.6
1 2-1/8 1-1/8 10.4
2 2-1/8 1-1/8 10.4
0051EE 44.1
1 2-1/8 1-1/8 11.7
2 2-1/8 1-1/8 10.4
0055EE 51.6
1 2-1/8 1-1/8 12.9
2 2-1/8 1-1/8 12.9
0065EE 59.5
1 2-1/8 1-1/8 14.9
2 2-1/8 1-1/8 14.9
0072EE 73.5
1 2-3/8 1-1/8 21.9
2 2-1/8 1-1/8 14.9
Hot gas bypass is only available for
refrigerant system number 1.