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QUANTECH
33
SECTION 4 – INSTALLATION
Form QCC2-NM1
Issue Date: 5/20/2021
4
Refrigerant piping reference
R-410A Copper Line Sizing
When selecting pipe diameter and material for piping
R-410A systems such as used with QCC2 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 copper does not require a
derate when brazed. By comparison, ASTM B88 ma-
terial does take an annealing penalty when brazing,
which in some applications, could reduce the calcu-
lated yield strength to a level below the system design.
QCC2 Line Sizing Notes
The QCC2 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 QCC2 is 2 1/8 in.
Table 1 - Fitting Equivalent Lengths
*COPPER FITTING 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)
ASTM B280, type “L” pipe, 2 1/8 in. diameter has a
pressure rating of 608 psi per ASME 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), per ASME B31.5-2006
section 504.1.2, has a rating of 725 psi before the ad-
ditional 20% allowance is taken.
For more details, refer to
“ASHRAE Refrigeration
Handbook, Chapter 2” and YORK DX Piping Guide
“Form 050.40-ES2”.
Table 4 on page 34
lists refrigerant line connections
sizes per unit model number.
Table 2 - Refrigerant Piping Charges
R410A SUCT @ 36 DEG LIQ @ 105 DEG
SUCTION LINES
SIZE,
IN. (MM)
ID CU
FT
DENSITY
LB/CU
FT
OZ/
FT
GRAMS/
30 CM
1-3/8 (35) 1.3 0.0 2.1 0.3 8.1
1-5/8 (41) 1.5 0.0 2.1 0.4 11.5
2-1/8 (54) 2.0 0.0 2.1 0.7 20.0
2-5/8 (67) 2.5 0.0 2.1 1.1 30.9
LIQUID LINES
3/4 (19) 0.7 0.0 60.9 2.4 66.8
7/8 (22) 0.8 0.0 60.9 3.3 92.8
1-1/8 (29) 1.0 0.0 60.9 5.6 158.3
1-3/8 (35) 1.3 0.0 60.9 8.5 241.1