JOHNSON CONTROLS
41
SECTION 4 – INSTALLATION
FORM 150.73-NM2
ISSUE DATE: 09/07/2020
4
TABLE 5 -
REFRIGERANT LINE PRESSURE DROPS (ENGLISH)
MODEL
NUMBER
SYSTEM
NUMBER
NOMINAL
TONS
SUCTION LINE
LIQUID LINE
COPPER
TYPE L
INCHES OD
PRESSURE
DROP
PSI/100FT
VELOCITY
@ NOMINAL
CAPACITY
IN FPM
NOMINAL
TONS
UNLOADED
COPPER
TYPE L
INCHES OD
PRES-
SURE DROP
PSI/100FT
0248YE
1
40.6
2-5/8
1
1656
13.5
1-1/8
3.90
2
40.6
2-5/8
1
1656
3.5
1-1/8
3.90
0278YE
1
44.7
2-5/8
1.2
1818
14.9
1-1/8
4.92
2
39.6
2-5/8
0.9
1572
13.2
1-1/8
3.73
0298YE
1
44.7
2-5/8
1.2
1812
14.9
1-1/8
4.85
2
46.4
2-5/8
1.3
1896
14.9
1-1/8
5.26
0308YE
1
49.2
2-5/8
1.3
1896
14.9
1-1/8
5.21
2
49.2
2-5/8
1.3
1896
14.9
1-1/8
5.21
0338YE
1
44.4
2-5/8
1.2
1812
14.9
1-1/8
4.86
2
67.2
2-5/8
2.3
2598
33.6
1-1/8
9.26
0408YE
1
65.5
2-5/8
2.4
2658
32.8
1-1/8
9.64
2
65.5
2-5/8
2.4
2658
32.8
1-1/8
9.64
0468YE
1
93.9
3-1/8
2.1
2790
31.3
1-3/8
5.74
2
51.4
2-5/8
1.4
1926
14.9
1-1/8
5.28
0498YE
1
92.1
3-1/8
2
2658
30.7
1-3/8
6.31
2
66.1
2-5/8
2.3
2556
33.1
1-3/8
8.87
Refrigerant Piping Notes on page 39
.
REFRIGERANT PIPING 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 of 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 liq-
uid 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 iso
-
lation 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 con-
ditions.
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 compres-
sor 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 refriger-
ant vapor at the wall surface to move the oil up
the vertical rise. Using piping of this size will al-
low 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 by-
pass valve.
7. For more information,
refer to either the John-
son Controls DX Piping Application Guide or the
ASHRAE Refrigeration Handbook.
Hot gas bypass is only available for re-
frigerant system number 1.
Summary of Contents for YLUA0248 Series
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