Carrier 38AH044-134 - Manual (Page 19)

Table 9A — Refrigerant Piping Requirements for 38AH044-084 Optionai Singie-Circuit Units and
38AH124,134 Modular Units (Duai Circuit) — 50 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 % 2У8 Ve 2У8 1У8 2Уа 1Уа 2%* 1У8 2%* 1% 2%*
054 % 2Ve V/8 2Уа 1У8 2%* 1Уа 2%* 1Уа 2%* 1% ЗУа*
064;
Modules 124A,
124B,134A
% 2Va V/a 2%t 1У8 2%t 1Уб 2%-f 1% ЗУа* 1% ЗУа*
074;
Module 134B
% 2Ув tVa 2%t 1У8 2%t 13/a ЗУ8* 1% ЗУе* 1% ЗУа*
084 IVe 2У8 V/a 25/st 1% ЗУа* 1% ЗУа* 1% ЗУа* 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 additionai field installed unloader on circuit A1
(lead) 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
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 CD inches Equivaient sizes in millimeters
follow:
in. mm
% 15.9
Ve 22 2
1Уа 28 6
1% 34 9
1% 41 3
2У8 54 0
2% 66.7
ЗУа 79 4
ЗУа 92 1
Table 9B — Refrigerant Piping Requirements for Doubie Suction Risers,
38AH044-084 Optional Single-Circuit Units and 38AH124,134 Modular Units (Dual Circuit) — 50 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)
A В c A В С А В С А В С А В С А В С
044 1% 2Уа 25/8 15/8 25/а 25/а 15/8 25/8 25/8
054 — — — — — — 1% 2Уа 2% 1% 2Уа 25/8 15/8 2У8 25/8 15/8 25/а ЗУа
064;
Modules 124A,
124B, 134A
— — — 1% 2Уа 2% 1% 2Уа 2% 1% 2Уа 25/8 15/8 25/8 ЗУе 15/8 25/а ЗУа
074;
Module 134B
— — — 1% 2Уа 2Уа 1% 2Уа 2% 1% 25/8 ЗУ8 15/8 25/8 ЗУа 15/8 ЗУа 35/а
084 — — — 1Уа 2Уа 2% 1% 2% ЗУа 1% 25/8 ЗУа 15/8 25/а ЗУа 15/8 ЗУа 35/8
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 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
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 CD inches See Table 9A notes for metric
equivalents
6 Refer to Fig 13 for double suction riser construction
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