Carrier 38AH044-084 specifications 38AH054-104 Dual-CircuitUnits Ð 60 Hz

Table 6A Ð Refrigerant Piping Requirements Ð 38AH044-104 Dual-Circuit Units Ð 60 Hz

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE Ð 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

5¤8

15¤8

7¤8

15¤8

7¤8

21¤8

7¤8

21¤8

7¤8

21¤8

7¤8

21¤8

Ckt B

5¤8

15¤8

7¤8

15¤8

7¤8

21¤8

7¤8

21¤8

7¤8

21¤8

7¤8

21¤8

054

Ckt A

5¤8

15¤8

7¤8

15¤8

7¤8

21¤8

7¤8

21¤8

7¤8

21¤8

7¤8

21¤8

Ckt B

7¤8

15¤8

7¤8

21¤8

7¤8

21¤8

11¤8

21¤8

11¤8

21¤8

11¤8

25¤8*

064

Ckt A

7¤8

15¤8

7¤8

21¤8

7¤8

21¤8

7¤8

21¤8

11¤8

21¤8

11¤8

25¤8²

Ckt B

7¤8

21¤8

7¤8

21¤8

7¤8

21¤8

11¤8

21¤8

11¤8

25¤8

11¤8

25¤8

074

Ckt A

7¤8

21¤8

7¤8

21¤8

7¤8

21¤8

11¤8

21¤8

11¤8

25¤8²

1 1¤8

25¤8²

Ckt B

7¤8

21¤8

11¤8

21¤8

11¤8

21¤8

11¤8

25¤8

13¤8

25¤8

13¤8

25¤8

084

Ckt A

7¤8

21¤8

11¤8

21¤8

11¤8

21¤8

11¤8

25¤8²

1 3¤8

25¤8²

1 3¤8

25¤8²

Ckt B

7¤8

21¤8

11¤8

21¤8

11¤8

21¤8

11¤8

25¤8

13¤8

25¤8

13¤8

25¤8

094

Ckt A

7¤8

21¤8

11¤8

21¤8

11¤8

25¤8²

1 1¤8

25¤8²

1 3¤8

25¤8²

1 3¤8

31¤8**

Ckt B

7¤8

21¤8

7¤8

21¤8

11¤8

21¤8

11¤8

25¤8

11¤8

25¤8

13¤8

25¤8

104

Ckt A

7¤8

21¤8

11¤8

21¤8

11¤8

25¤8²

1 1¤8

25¤8²

1 3¤8

25¤8²

1 3¤8

31¤8**

Ckt B

7¤8

21¤8

11¤8

21¤8

11¤8

25¤8

11¤8

25¤8

13¤8

31¤8**

13¤8

31¤8**

LEGEND

LÐ Liquid Line S Ð Suction Line

*Double suction riser required on units with ®eld installed unloader on circuit B compressor if condensing unit is elevated above evaporator.

²Double suction riser required on units with ®eld installed unloader on circuit B compressor if condensing unit is elevated above evaporator.

**Double suction riser required on all unit con®gurations 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 con®gurations. They do NOT take into account any ®eld 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 ®ttings.

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 ef®ciency.

6.Double suction risers may be required if condensing unit is elevated 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
5¤8	15.9
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

Table 6B Ð Refrigerant Piping Requirements for Double Suction Risers,

38AH054-104 Dual-Circuit Units Ð 60 Hz

TOTAL LINEAR LENGTH OF INTERCONNECTING PIPE Ð 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

B

C

A

B

C

A

B

C

A

B

C

054

Ckt A

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ckt B

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

1

5¤8

21¤8

25¤8

064

Ckt A

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

1

5¤8

21¤8

25¤8

Ckt B

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

074

Ckt A

Ð

Ð

Ð

Ð

Ð

Ð

1

5¤8

21¤8

25¤8

15¤8

21¤8

25¤8

Ckt B

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

084

Ckt A

Ð

Ð

Ð

1 5¤8

21¤8

25¤8

15¤8

21¤8

25¤8

15¤8

21¤8

25¤8

Ckt B

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

094

Ckt A

15¤8

21¤8

25¤8

15¤8

21¤8

25¤8

15¤8

21¤8

25¤8

15¤8

25¤8

31¤8

Ckt B

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

Ð

104

Ckt A

13¤8

21¤8

25¤8

13¤8

21¤8

25¤8

13¤8

21¤8

25¤8

15¤8

25¤8

31¤8

Ckt B

Ð

Ð

Ð

Ð

Ð

Ð

1

3¤8

25¤8

31¤8

15¤8

25¤8

31¤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 determine 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 6A notes for metric equivalents.

6.Refer to Fig. 13 for double suction riser construction.

16