Carrier 38AH044-134 - Manual (Page 18)

Table 8A — Refrigerant Piping Requirements for 38AH044-084 Optionai Single-Circuit Units and
38AH124,134 Modular Units (Duai-Circuit) — 60 Hz
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT (M)
UNIT 38AH
15-20
(4.6-6.1)
20-50
(6.1-15.2)
50-75
(15.2-22.9)
75-100
(22.9-30.5)
100-150
(30.5-45.7)
150-200
(45.7-61.0)
L s L s L s L s L S L S
044 % 2V8 % 2Ув 1У8 2Уа 1У8 2%* 1% 2%* 1% ЗУ8*
054 % 2У8 1У8 2% 1У8 2% 1У8 2% 1% ЗУ8* 1% ЗУ8*
064;
Modules 124A,
1248,134A
1У8 2У8 1У8 2%t 1У8 2%t 1% ЗУ8* 1% ЗУ8* 1% ЗУ8*
074;
Module 134B
1У8 2У8 1У8 2%t 1% 3V8t 1% 3yat 1% ЗУв| 1% 3%*
084 IVe 2%t 1У8 2%t 1% 3Vsf 1% 31/8t 1% 3%t 1% 3%*
LEGEND
CV — Constant Volume
L — Liquid Line
S — Suction Line
VAV — Variable Air Volume
‘Double suction riser required on all units configurations if condens­
ing unit is elevated above evaporator.
tDouble suction riser required on units with factory installed VAV op­
tion or CV units with additional field installed unloader on circuit A1
Oead) compressor if condensing unit is elevated above evaporator
NOTES;
1 Addition of field-installed unloaders on A2 (lag) compressor is not
recommended
2. 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
3. Pipe sizes are based on the total linear length shown for each
column, plus a 50% allowance for fittings.
4 Suction and liquid line sizing is based on pressure drop equivalent
to 2 F (1 1 C) at nominal rating conditions Higher pressure drop
7.
design criteria may allow selection of smaller pipe sizes, but at a
penalty of decreased system capacity and efficiency
Double suction risers may be required if condensing unit is el­
evated above the evaporator See footnotes and double suction
riser table below.
Refer to Carrier System Design Manual, E20-II design program,
or ASHRAE Handbook for further information on selecting pipe
sizes for split systems.
All pipe sizes are OD inches Equivalent sizes in millimeters
follow;
in. mm
% 159
% 22 2
1У8 28 6
1% 34 9
1% 41 3
2Ув 54 0
2% 66.7
ЗУ8 79.4
3% 92 1
Table 8B — Refrigerant Piping Requirements for Double Suction Risers, 38AH044-084 Optional Single-Circuit
Units and 38AH124,134 Moduiar Units (Dual-Circuit) — 60 Hz
TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE — FT
UNIT 38AH
15-50
(4.6-15.2
50-75
(15.2-22.9)
75-100
(22.9-30.5)
100-150
(30.5-45.7)
150-200
(45.7-61.0)
A В С А В С А В С А В С А В С
044 — — — — — — 1% 2Уа 2% 1% 2Уа 2% 1% 2% ЗУе
054 — — — — — — — — — 1% 2% ЗУа 1% 2% ЗУа
064
Modules 124A,
124B,134A
1% 2Ув 2% 1У8 2У8 2% 1% 2% ЗУа 15/а 2% ЗУа 1% 2% ЗУе
074;
Module 134B
1% 2Ув 2% 1% 2% ЗУз 1% 2% ЗУв 1% 2% ЗУе 2У8 ЗУв ЗУа
084 1% 2У8 2% 1У8 2% ЗУа 1У8 2% ЗУа 2Уа ЗУа 3% 2Уа ЗУе 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 Suction and liquid line sizing is based on pressure drop equivalent
to 2 F (1.1 C) 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
4. Refer to Carrier System Design Manual or to E20-II design
programs for further information on selecting pipe sizes for split
systems
5 All pipe sizes are OD inches See Table 8A notes for metric
equivalents
6 Refer to Fig 13 for double suction riser construction
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