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suction riser should be used for listed pipe sizes to pro-
vide adequate oil return at reduced loads. The calculated
information was based on maintaining a minimum of
1000 fpm (5.08 m/s) refrigerant vapor velocity.
Condenser Below Evaporator
When the condensing unit is located below the evapo-
rator, the liquid line must be designed for both friction
loss and static head loss due the vertical rise. The value
of static head loss of 5 psi/ft.(3.4 kPa/30 cm) must be
added to the friction loss pressure drop in addition to
all pressure drops due to driers, valves, etc.
OIL TRAPS
All suction lines with a vertical rise exceeding 3 feet
(.91 meters) should have a "P" trap at the bottom and
top (inverted) of the riser. Suction lines with a vertical
rise exceeding 25 feet (7.6 meters) should be trapped
every 15 feet (4.6 meters).
TABLE 1 – FITTING EQUIVALENT LENGTHS
*COPPER FITTING EQUIVALENT LENGTHS
LINE SIZE O.D.
SHORT-RADIUS ELL
3/4" (19mm)
6.5 ft. (2m)
7/8" (22mm)
7.8 ft. (2.4m)
1-1/8" (29mm)
2.7 ft. (.8m)
1-3/8" (35mm)
3.2 ft. (1m)
1-5/8" (41mm)
3.8 ft. (1.2m)
2-1/8" (54mm)
5.2 ft. (1.6m)
2-5/8" (67mm)
6.5 ft. (20m)
TABLE 2 – 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
*
Pressure drops or equivalent length values are approximate. If
more precise value is desired, consult ASHRAE Refrigerant
Handbook.
TABLE 3 – REFRIGERANT PIPING CHARGES
SUCTION LINES
1-3/8" (35mm)
1-5/8" (41mm)
2-1/8" (54mm)
2-5/8" (67mm)
YORK INTERNATIONAL
LONG-RADIUS ELL
4.5 ft. (1.4m)
5.3 ft. (1.6m)
1.9 ft. (.6m)
2.2 ft. (.7m)
2.6 ft. (8m)
3.4 ft. (1m)
4.2 ft. (1.3m)
0.5 PSI (3.4 kPa)
REFRIGERANT LINE CHARGES
.2 oz./ft. (6 grams/30cm)
.3 oz./ft. (8 grams/30 cm)
.6 oz/ft. (17 grams/30cm)
.8 oz./ft. (23 grams/30cm)
REFRIGERANT CHARGE
The condensing unit is charged with 6 lbs. (2.7 kg) of
R-22 for a holding charge. The remaining operating
charge for the condensing unit, evaporator coil, and
refrigerant piping must be "weighed-in" after all refrig-
erant piping is installed, leak checked, and evacuated.
Final adjustment of refrigerant charge should be veri-
fied by subcooling values (refer to section on Pre-
Startup for checking subcooling). See Table 3 for Re-
frigerant Line Charges.
FILTER DRIERS
Liquid line filter driers and sight glass is factory sup-
plied for field installation on each refrigerant system.
REFRIGERANT PIPING REFERENCE
For more details, refer to ASHRAE Refrigeration Hand-
book, Chapter 2.
TABLE 4 – REFRIGERANT LINE CONNECTIONS
YCUL REFRIGERANT LINE CONNECTIONS
MODEL
SUCTION
YCUL0016
1-3/8" (35mm)
YCUL0026
1-5/8" (41mm)
YCUL0030
2-1/8" (54mm)
YCUL0036
2-1/8" (54mm)
YCUL0040
2-1/8" (54mm)
YCUL0046
2-1/8" (54mm)
YCUL0056
2-1/8" (54mm)
YCUL0060
2-1/8" (54mm)
YCUL0066
2-1/8" (54mm)
YCUL0076
2-1/8" (54mm)
YCUL0080
2-1/8" (54mm)
YCUL0086
2-1/8" (54mm)
YCUL0090
2-5/8" (67mm)
LIQUID LINES
3/4" (19mm)
2.7 oz./ft. (76 grams/30cm)
7/8" (22mm)
3.7 oz./ft. (105 grams/30cm)
1-1/8" (29mm)
6.2 oz./ft. (176 grams/30cm)
1-3/8" (35mm)
8.6 oz./ft. (244 grams/30cm)
FORM 150.63-NM1
1
LIQUID
7/8" (22mm)
7/8" (22mm)
7/8" (22mm)
7/8" (22mm)
7/8" (22mm)
7/8" (22mm)
7/8" (22mm)
7/8" (22mm)
7/8" (22mm)
1-1/8" (29mm)
1-1/8" (29mm)
1-1/8" (29mm)
1-1/8" (29mm)
13
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