Carrier 38AH044-134 - Manual (Page 16)

Table 6A — Refrigerant Piping Requirements — 38AH044-104 Dual-Circuit Units — 60 Hz
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)
UNIT 38AH
15-25 25-50 50-75 75-100 100-150 150-200
(4.6-7.6) (7.6-15.2) (15.2-22.9) (22.9-30.5) (30.5-45.7) (45.7-61.0)
L s L S L S L S L S L s
044
Ckt A % 1% У8 1У8 Ув 2Ув Уе 2Уе Уе 2Ув Va 2Ув
Ckt В % 1% У8 1% Ув 2Ув Ув 2Ув Va 2Уе Va 2Ув
054
Ckt A % 1% У8 1% Ув 2Ув Va 2Ув Va 2Ув Va 2Ув
Ckt В У8 1% У8 2У8 Ув 2Ув 1Ув 2Ув 1Ув 2Ув 1У8 2%*
064
Ckt A % 1% У8 2Ув Ув 2Ув Уе 2Ув 1Уе 2Ув 1Ув 2%t
Ckt В % 2Ve У8 2Ув Ув 2Ув 1Ув 2Ув 1У8 2% 1У8 2%
074
Ckt A % 2Ve У8 2Уа Ув 2Ув 1Ув 2Ув 1Ув 2%t 1У8 2%t
Ckt В % 2V8 1У8 2У8 1У8 2Ув 1Ув 2% 1Ув 2% 1% 2%
084
Ckt A % 2V8 1Ув 2Ув 1Уе 2Ув 1У8 2%t 1% 2%t 1Ув 2%t
Ckt В V8 2Уа 1У8 2Ув 1Ув 2Ув 1Ув 2% 1У8 2% 1Ув 2%
094
Ckt A % 2V8 1Уб 2Уа 1 Ve 2%t 1Ув 2%t 1% 2%t 1% ЗУв“
Ckt В % 2Ve Ув 2У8 V/a 2Ув 1Ув 2% 1Уа 2% 1Ув 2%
104
Ckt A % 2Ув 1У8 2Ув 1Ув 2%t 1Уз 2%t 1Ув 2%t 1У8 ЗУв“
Ckt В % 2Ув 1Уб 2Ув 1Ув 2Уе 1Ув 2% 1% ЗУв“ 1У8 ЗУв“
LEGEND
CV — Constant Volume
L — Liquid Line
S — Suction Line
VAV — Variable Air Voiume
‘Double suction riser required on units with field installed unloader
on circuit В compressor if condensing unit is elevated above
evaporator.
tDouble suction riser required on units with field installed unloader
on circuit В compressor if condensing unit is elevated above
evaporator.
“Double suction riser required on all unit configurations if condens­
ing unit is elevated above evaporator.
NOTES:
1. Addition of 2 unloaders to circuit В compressor is not
recommended
2 38AH094 and 38AH104 piping sizes apply only to factory sup­
plied unit configurations They do NOT take into account any field
installed unloaders
3 Piping sizes are based on unit operation above 40 F (4 4 C) satu­
rated suction temperature (SST) When operating below 40 F
(4 4 C), refer to Carrier System Design Manuai, E20-IÌ piping de­
sign program, or ASHRAE Handbook to select proper line sizes
4 Pipe sizes are based on the total linear length shown for each
column, plus a 50% allowance for fittings.
5 Suction and liquid line sizing is based on pressure drop equivalent
to 2 F (1.1 C) at nominal rating conditions. Higher pressure drop
design criteria may allow selection of smaller pipe sizes, but at a
penalty of decreased system capacity and efficiency
6. Double suction risers may be required if condensing unit is el­
evated above the evaporator See footnotes and double suction
riser table below
7 Refer to Carrier System Design Manual or to E20-II design
programs for further information on selecting pipe sizes for split
systems
8. All pipe sizes are OD inches Equivalent sizes in millimeters
follow
in. mm
% 15.9
Уе 22.2
v/a 28.6
V/a 34 9
V/a 41 3
2Уа 54 0
2% 66 7
ЗУв 79 4
3% 92 1
Table 6B — Refrigerant Piping Requirements for Double Suction Risers,
38AH054-104 Duai-Circuit Units — 60 Hz
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)
UNIT 38АН
50-75 75-100 100-150 150-200
15.2-22.9) (22.9-30.5 30.5-45.7 (45.7-61.0
A В С А В С А В С А В С
054
Ckt А
Ckt В
_
— — — — —
___ ___
—
V/a 2Ув 2%
064
Ckt A
Ckt В
_
___
— — — —
___
—
___
V/a 2Va 2%
074
Ckt A
Ckt В
_
___
— —
___
— 1Ув 2Ув 2% 1Ув 2Уа 2%
084
Ckt A
Ckt В
_
— — 1Ув 2Уе 2% 1Уе 2Ув 2% V/a 2Va 2%
094
Ckt A
Ckt В 1У8 2Ув 2% V/a 2Ув 2% 1% 2Ув 2% V/a 2% ЗУв
104
Ckt A 1Ув 2Ув 2¥а V/a 2Ув 2% 1Ув 2Ув 2% V/a 2% ЗУв
Ckt В — — — — — — 1Ув 2% ЗУв V/a 2% ЗУв
LEGEND
— — Not Required
Pipe A — Suction Riser Without Trap
Pipe B — Suction Riser With Trap
Pipe C — Suction Line to Condensing Unit
NOTES.
1 See Refrigerant Piping Requirements table at top of page to de­
termine need for double suction risers.
2 Pipe sizes are based on the total linear length, shown for each
column, plus a 50% allowance for fittings.
Suction and liquid line sizing is based on pressure drop equivalent
to 2 F (1 1C) at nominal rating conditions Higher design pressure
drop criteria may allow selection of smaller pipe sizes but at a pen­
alty of decreased system capacity and efficiency.
Refer to Carrier System Design Manual or to E20-II design
programs for further information on selecting pipe sizes for split
systems
All pipe sizes are OD inches. See Table 6A notes for metric
equivalents
Refer to Fig. 13 for double suction riser construction
16