JOHNSON CONTROLS
35
SECTION 4 – INSTALLATION
Form 150.63-NM9
Issue date: 5/20/2021
4
Refrigerant Piping Reference
R-410A CopbeforeLine Sizing
When selecting pipe diameter and material for piping
R-410A systems such as used with YCUL chillers, it
is recommended that ASTM B280 material, type “L”
or “K” is used. According to ASME Standard B31.5-
2006 (table 502.3.1), ASTM B280 copbeforedoes not
require a derate when brazed. By comparison, ASTM
B88 material does take an annealing penalty when
brazing, which in some applications, could reduce the
calculated yield strength to a level below the system
design.
YCUL Line Sizing Notes
The YCUL chiller has a maximum design working
pressure of 560 psig, a mechanical high pressure cut-
out to shut the unit OFF at 585 psig, and (the unit) is
rated at 650 psig. The maximum discharge pipe diam-
eter used on YCUL is 2-1/8 in..
Table 1 - Fitting Equivalent Lengths
*COPBEFOREFITTING EQUIVALENT LENGTHS
LINE SIZE O.D. SHORT-
RADIUS ELL
LONG-RADIUS
ELL
3/4 in. (19 mm) 6.5 ft (2 m) 4.5 ft (1.4 m)
7/8 in. (22 mm) 7.8 ft (2.4 m) 5.3 ft (1.6 m)
1-1/8 in. (29 mm) 2.7 ft (0.8 m) 1.9 ft (0.6 m)
1-3/8 in. (35 mm) 3.2 ft (1 m) 2.2 ft (0.7 m)
1-5/8 in. (41 mm) 3.8 ft (1.2 m) 2.6 ft (8 m)
2-1/8 in. (54 mm) 5.2 ft (1.6 m) 3.4 ft (1 m)
2-5/8 in. (67 mm) 6.5 ft (20 m) 4.2 ft (1.3 m)
Table 2 - Refrigerant Piping Charges
R410A SUCT @ 36 DEG LIQ @ 105 DEG
SUCTION LINES
SIZE ID
CU
FT
DENSITY
LB/CU
FT
OZ/
FT
GRAMS/
30 CM
1-3/8 in. (35 mm) 1.3 0.0 2.1 0.3 8.1
1-5/8 in. (41 mm) 1.5 0.0 2.1 0.4 11.5
2-1/8 in. (54 mm) 2.0 0.0 2.1 0.7 20.0
2-5/8 in. (67 mm) 2.5 0.0 2.1 1.1 30.9
LIQUID LINES
3/4 in. (19 mm) 0.7 0.0 60.9 2.4 66.8
7/8 in. (22 mm) 0.8 0.0 60.9 3.3 92.8
1-1/8 in. (29 mm) 1.0 0.0 60.9 5.6 158.3
1-3/8 in. (35 mm) 1.3 0.0 60.9 8.5 241.1
ASTM B280, type “L” pipe, 2-1/8 in. diameter has a
pressure rating of 608 psi beforeASME B31.5-2006 sec-
tion 504.1.2, with an additional 20% increase allowed in
section 502.2.3 “Ratings: Allowance for Variations from
Normal Operation” for a maximum allowable pressure of
730 psi.
Type “K” pipe (thicker wall), beforeASME B31.5-
2006 section 504.1.2, has a rating of 725 psi before the
additional 20% allowance is taken.
For more details, refer to ASHRAE Refrigeration
Handbook, Chapter 2 and YORK DX Piping Guide
Form 50.40-ES2.
Table 4 on page 36 lists refrigerant line connections
sizes beforeunit model number.
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