Carrier 38AH044-134 - Manual (Page 17)

Table 7A — Refrigerant Piping Requirements, 38AH044-104 Dual-Circuit Units — 50 Hz
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)
UNIT 15-25 25-50 50-75 75-100 100-150 150-200
38AH (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% % 1% % 1% % 2У8 Va 2Уе Va 2У8
Ckt В % 1% % 1% Va 1% Va 2У8 Va 2Va Va 2У8
054
Ckt A % 1% Va 1% Va 1% Va 2Уб Va 2Va Va 2У8
Ckt В % Wa Va 1% Va 2У8 Va 2Уа ^Va 2Va 1У8 2%*t
064
Ckt A % Wa Va 1% Va 2yst Va 2Va\ V/a 2Va\ 1У8 2%”
Ckt В % 1% Va 2У8 Va 2Ув Va 2Va V/a 2%* ' 1У8 2%’
074
Ckt A % 1% Va 2Уа Va 2Ув Va 2Va ^Va 2%t 1У8 2%t
Ckt В % 2Ув Va 2Уб 1У8 2Ув 1У8 2% V/a 2% 1У8 2%
084
Ckt A % 2Va Va 2Ув 1У8 2Ув 1У8 2%t 1У8 2Щ 1У8 2%t
Ckt В % 2Va Va 2Ув 1Ув 2У8 1Уа 2% 1У8 2% 1У8 2%
094
Ckt A % 2Va IVe 2Ув ^ 1У8 2%” 1У8 2%” 1У8 2%” 1% ЗУв”
Ckt В % 2Va % 2Уе 1У8 2У8 1У8 2¥8*t 1У8 2%*t 1У8 2%’t
104
Ckt A % 2Va Va 2Ув 1У8 2Уа 1У8 2%” 1У8 2У8** 1% ЗУе”
Ckt В % 2Va 1У8 2Ув 1У8 2% 1У8 2Va 1% 2% 1% ЗУ8”
i.
LEGEND
CV — Constant Volume
L — Liquid Line
S — Suction Line
VAV — Variable Air Volume
’Double suction riser required on units with field installed unloader
on circuit B compressor if condensing unit is elevated above
evaporator.
TDouble suction riser required on units with field installed unloader
on circuit B 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 B 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 Manual, E20-II 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
Va 159
Va 22 2
V/a 28 6
V/a 34 9
V/a 41 3
2Va 54 0
2Va 66.7
ЗУ8 79 4
ЗУ8 92 1
Table 7B— Refrigerant Piping Requirements for Double Suction Risers,
38AH054-104 Dual-Circuit Units — 50 Hz
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)
UNIT 50-75 75-100 100-150 150-200
38AH 15.2-22.9) (22.9-30.5) 30.5-45.7) 45.7-61.0
A В C A В С А В С А В С
054
Ckt A
Ckt В ___ ___
—
___
—
___
— —
___ V/a 2Уа 25/8
064
Ckt A 1% V/a 2У8 V/a V/a 2Ув 15/8 15/8 2У8 V/a 2Уа 25/8
Ckt В — — — — — — 15/8 2Уа 25/8 V/a 2Уа 25/8
074
Ckt A
Ckt В ___ ___
—
___ ___ ___
15/8 2Уа 25/8 V/a 2Уа 25/8
084
Ckt A
Ckt В
___ ___
— V/a 2У8 25/8 15/8 2Уа 25/8 V/a 2Уа 25/8
094
Ckt A V/a 2Vs 2% V/a 2Уз 25/8 15/s 2Уа 25/8 V/a 25/8 ЗУз
Ckt В — — — V/a 2Ув 25/8 15/8 2Уа 25/8 V/a 2У8 25/8
104
Ckt A —
— —
V/a 2Уе 25/8 15/8 2Уа 25/8 V/a 25/8 ЗУб
Ckt В — — — — — — — — — V/a 25/8 ЗУ8
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.
3.
4.
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 7A notes for metric
equivalents
Refer to Fig. 13 for double suction riser construction
17