Carrier 38AH044-084 specifications Optional Single-CircuitUnits and 38AH124,134

Table 8A Ð Refrigerant Piping Requirements for 38AH044-084

Optional Single-Circuit Units and 38AH124,134

Modular Units (Dual-Circuit) Ð 60 Hz

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE Ð FT (M)

UNIT

15-20

20-50

50-75

75-100

100-150

150-200

38AH

(4.6-6.1)

(6.1-15.2)

(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

7¤8

21¤8

7¤8

21¤8

11¤8

21¤8

11¤8

25¤8*

13¤8

25¤8*

13¤8

31¤8*

054

7¤8

21¤8

11¤8

25¤8

11¤8

25¤8

11¤8

25¤8

13¤8

31¤8*

13¤8

31¤8*

064;

Modules 124A,

11¤8

21¤8

11¤8

25¤8²

1 1¤8

25¤8²

1 3¤8

31¤8*

13¤8

31¤8*

13¤8

31¤8*

124B,134A

074;

11¤8

21¤8

11¤8

25¤8²

1 3¤8

31¤8²

1 3¤8

31¤8²

1 3¤8

31¤8²

1 5¤8

35¤8*

Module 134B

084

11¤8

25¤8²

1 1¤8

25¤8²

1 3¤8

31¤8²

1 3¤8

31¤8²

1 5¤8

35¤8²

1 5¤8

35¤8*

LEGEND

CV Ð Constant Volume

LÐ Liquid Line

S Ð Suction Line

VAV Ð Variable Air Volume

*Double suction riser required on all units con®gurations if condens- ing unit is elevated above evaporator.

²Double suction riser required on units with factory installed VAV op- tion or CV units with additional ®eld installed unloader on circuit A1 (lead) compressor if condensing unit is elevated above evaporator.

NOTES:

1.Addition of ®eld-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 design 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 ®ttings.

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 ef®ciency.

5.Double suction risers may be required if condensing unit is elevated above the evaporator. See footnotes and double suction riser table below.

6.Refer to Carrier System Design Manual, E20-II design program, or ASHRAE Handbook for further information on selecting pipe sizes for split systems.

7.All pipe sizes are OD inches. Equivalent sizes in millimeters follow:

in.	mm
7¤8	22.2
11¤8	28.6
13¤8	34.9
15¤8	41.3
21¤8	54.0
25¤8	66.7
31¤8	79.4
35¤8	92.1

Table 8B Ð Refrigerant Piping Requirements for Double Suction Risers,

38AH044-084 Optional Single-Circuit Units and 38AH124,134

Modular Units (Dual-Circuit) Ð 60 Hz

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE Ð FT

UNIT

15-50

50-75

75-100

100-150

150-200

38AH

(4.6-15.2)

(15.2-22.9)

(22.9-30.5)

(30.5-45.7)

(45.7-61.0)

A

B

C

A

B

C

A

B

C

A

B

C

A

B

C

044

Ð

Ð

Ð

Ð

Ð

Ð

1

5¤8

21¤8

25¤8

15¤8

21¤8

25¤8

15¤8

25¤8

31¤8

054

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

1

5¤8

25¤8

31¤8

15¤8

25¤8

31¤8

064

Modules 124A,

15¤8

21¤8

25¤8

15¤8

21¤8

25¤8

15¤8

25¤8

31¤8

15¤8

25¤8

31¤8

15¤8

25¤8

31¤8

124B,134A

074;

15¤8

21¤8

25¤8

15¤8

25¤8

31¤8

15¤8

25¤8

31¤8

15¤8

25¤8

31¤8

21¤8

31¤8

35¤8

Module 134B

084

15¤8

21¤8

25¤8

15¤8

25¤8

31¤8

15¤8

25¤8

31¤8

21¤8

31¤8

35¤8

21¤8

31¤8

35¤8

LEGEND

ÐÐ Not Required

Pipe A Ð Suction Riser Without Trap

Pipe B Ð Suction Riser With Trap

Pipe C Ð 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 ®ttings.

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 ef®ciency.

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.

18