Quantech QCC2015CEE, Инструкция по установке, эксплуатации и обслуживанию, Страница: 34 / 172

QUANTECH
34
Form QCC2-NM1
Issue Date: 5/20/2021
SECTION 4 – INSTALLATION
Table 3 - Miscellaneous Liquid Line Pressure Drops
*MISCELLANEOUS LIQUID LINE PRESSURE
SOLENOID VALVE 2 TO 3 PSI (13.8 TO 20.7 kPa)
FILTER/DRIER 2 TO 3 PSI (13.8 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 of 3 PSI/100 ft. (20.7kPa30.5m).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 .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 correct 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. Using piping of this size will allow velocities at part load to fall
below 1000 fpm (5.08 m/s) minimum required for oil return.
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.
7. For more information, refer to either the YORK DX Piping Application Guide (Form 050.40-ES2) or the ASHRAE Refrigeration Handbook.
Hot gas bypass is only available for
refrigerant system number 1.
Table 4 - Refrigerant Line Connections
MODEL
NUMBER
TONS
SYSTEM
NUMBER
REFRIGERANT LINE
CONNECTION
SUCTION
LINE
LIQUID LINE
SUCTION LIQUID
COPPER
TYPE L
INCHES OD
NOMINAL
TONS
UNLOADED
COPPER
TYPE L
INCHES OD
015CEE 17.0 1 1.6 0.9 1-5/8 8.5 7/8
020CEE 20.1 1 1.6 0.9 1-5/8 10.1 7/8
025CEE 27.0 1 2.1 1.1 2-1/8 12.3 1-1/8
030CEE 30.9 1 2.1 1.1 2-1/8 15.5 1-1/8
040CEE 41.6
1 2.1 1.1 2-1/8 10.4 1-1/8
2 2.1 1.1 2-1/8 10.4 1-1/8
045CEE 44.1
1 2.1 1.1 2-1/8 11.7 1-1/8
2 2.1 1.1 2-1/8 10.4 1-1/8
050CEE 51.6
1 2.1 1.1 2-1/8 12.9 1-1/8
2 2.1 1.1 2-1/8 12.9 1-1/8
060CEE
59.5
1 2.1 1.1 2-1/8 14.9 1-1/8
2 2.1 1.1 2-1/8 14.9 1-1/8
070CEE 73.5
1 2.1 1.1 2-3/8 21.9 1-1/8
2 2.1 1.1 2-1/8 14.9 1-1/8