Table 20 — Direct Expansion Coil Circuiting Data (cont)
LARGE FACE AREA COILS (cont)
39T UNIT SIZE 17 21 26
CIRCUITING TYPE Half Full Double Half Full Double Half Full Double
Airflow (cfm) at 550 fpm 8895 11,439 14,215
Total Face Area (sq ft) 16.2 20.8 25.8
Tubes in Face 28 34 38
Tube Length (in.) 66
9
⁄
16
70
1
⁄
2
78
3
⁄
8
No. of Circuits — Total 14 28 56 17 34 68 19 38 76
4-Row Coil
Circuit Equivalent Length (in.) 54.9 32.7 — 57.5 34.0 — 62.7 36.6 —
Face-Split Coils
No. of TXVs 22—22—24—
No. of Circuits/Distributor* 7 14 — 8,9 17 — 9,10 9,10 —
Suction Connections (in. OD) 1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—
Distributor Connections (in. OD)
7
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
1
⁄
8
—
Distributor Tube Length (in.) 21 21 — 15 21 — 28 18 —
Distributor Nozzle Size† 10 10 — 12 12 — 15 15 —
Row-Split Coils
No. of TXVs 22—22—24—
No. of Circuits/Distributor* 7 14 — 8,9 17 — 9,10 9,10 —
Suction Connections (in. OD) 1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—
Distributor Connections (in. OD)
7
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
1
⁄
8
—
Distributor Tube Length (in.) 21 21 — 15 21 — 28 18 —
Distributor Nozzle Size† 10 10 — 12 12 — 15 15 —
6-Row Coil
Circuit Equivalent Length (in.) 83.0 40.8 — 87.0 42.7 — 94.9 46.7 —
Face-Split Coils
No. of TXVs 22—22—24—
No. of Circuits/Distributor* 7 14 — 8,9 17 — 9,10 9,10 —
Suction Connections (in. OD) 1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—
Distributor Connections (in. OD)
7
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
1
⁄
8
—
Distributor Tube Length (in.) 21 21 — 15 21 — 28 18 —
Distributor Nozzle Size† 10 10 — 12 12 — 15 15 —
Row-Split Coils
No. of TXVs 22—22—24—
No. of Circuits/Distributor* 7 14 — 8,9 17 — 9,10 9,10 —
Suction Connections (in. OD) 1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—
Distributor Connections (in. OD)
7
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
1
⁄
8
—
Distributor Tube Length (in.) 21 21 — 15 21 — 28 18 —
Distributor Nozzle Size† 10 10 — 12 12 — 15 15 —
8-Row Coil
Circuit Equivalent Length (in.) — 54.9 26.7 — 57.5 28.0 — 62.7 30.6
Face-Split Coils
No. of TXVs —2 4 —2 4 —4 8
No. of Circuits/Distributor* — 14 14 — 17 17 — 9,10 9,10
Suction Connections (in. OD) —1
5
⁄
8
1
5
⁄
8
—1
5
⁄
8
1
5
⁄
8
—1
5
⁄
8
1
5
⁄
8
Distributor Connections (in. OD) —1
3
⁄
8
1
3
⁄
8
—1
3
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
1
⁄
8
Distributor Tube Length (in.) — 21 13 — 21 21 — 18 13
Distributor Nozzle Size† —10 5 —12 6 —15 8
Row-Split Coils
No. of TXVs —2 4 —2 4 —4 8
No. of Circuits/Distributor* — 14 14 — 17 17 — 9,10 9,10
Suction Connections (in. OD) —1
5
⁄
8
1
5
⁄
8
—1
5
⁄
8
1
5
⁄
8
—1
5
⁄
8
1
5
⁄
8
Distributor Connections (in. OD) —1
3
⁄
8
1
3
⁄
8
—1
3
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
1
⁄
8
Distributor Tube Length (in.) — 21 13 — 21 21 — 18 13
Distributor Nozzle Size† —10 5 —12 6 —15 8
LEGEND
TXV — Thermostatic Expansion Valve (Field-Supplied)
*Where each distributor has the same number of circuits, that number is shown once. When a coil has
an uneven number of circuits per distributor, both values are shown. For example, the upper coil of a
half-circuit size 32 large face area coil has 5 circuits on one distributor and 6 circuits on the other
distributor; the lower coil has 6 circuits on each distributor.
†Factory-supplied distributors have factory-selected nozzle sizes shown. If necessary, replace factory-
supplied nozzles with field-supplied and installed nozzles. Consult Electronic Catalog
AHU Builder™
program for correct nozzle selection.
52
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