Table 20 — Direct Expansion Coil Circuiting Data (cont)
MEDIUM FACE AREA COILS (cont)
39T UNIT SIZE 17 21 26
CIRCUITING TYPE Half Full Double Half Full Double Half Full Double
Airlfow (cfm) at 550 fpm 6989 9420 11,970
Total Face Area (sq ft) 12.7 17.1 21.8
Tubes in Face 22 28 32
Tube Length (in.) 66
9
⁄
16
70
1
⁄
2
78
3
⁄
8
No. of Circuits — Total 11 22 44 14 28 56 16 32 64
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—22—
No. of Circuits/Distributor* 611 — 714 — 816 —
Suction Connections (in. OD) 1
1
⁄
8
1
3
⁄
8
—1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—
Distributor Connections (in. OD)
7
⁄
8
1
3
⁄
8
—
7
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
3
⁄
8
—
Distributor Tube Length (in.) 21 18 — 21 21 — 15 21 —
Distributor Nozzle Size† 6 6 — 10 10 — 12 12 —
Row-Split Coils
No. of TXVs 22—22—22—
No. of Circuits/Distributor* 611 — 714 — 816 —
Suction Connections (in. OD) 1
1
⁄
8
1
3
⁄
8
—1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—
Distributor Connections (in. OD)
7
⁄
8
1
3
⁄
8
—
7
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
3
⁄
8
—
Distributor Tube Length (in.) 21 18 — 21 21 — 15 21 —
Distributor Nozzle Size† 6 6 — 10 10 — 12 12 —
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—22—
No. of Circuits/Distributor* 611 — 714 — 816 —
Suction Connections (in. OD) 1
1
⁄
8
1
3
⁄
8
—1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—
Distributor Connections (in. OD)
7
⁄
8
1
3
⁄
8
—
7
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
3
⁄
8
—
Distributor Tube Length (in.) 21 18 — 21 21 — 15 21 —
Distributor Nozzle Size† 6 6 — 10 10 — 12 12 —
Row-Split Coils
No. of TXVs 22—22—22—
No. of Circuits/Distributor* 611 — 714 — 816 —
Suction Connections (in. OD) 1
1
⁄
8
1
3
⁄
8
—1
3
⁄
8
1
5
⁄
8
—1
3
⁄
8
1
5
⁄
8
—
Distributor Connections (in. OD)
7
⁄
8
1
3
⁄
8
—
7
⁄
8
1
3
⁄
8
—1
1
⁄
8
1
3
⁄
8
—
Distributor Tube Length (in.) 21 18 — 21 21 — 15 21 —
Distributor Nozzle Size† 6 6 — 10 10 — 12 12 —
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 —2 4
No. of Circuits/Distributor* — 11 11 — 14 14 — 16 16
Suction Connections (in. OD) —1
3
⁄
8
1
3
⁄
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
3
⁄
8
1
3
⁄
8
Distributor Tube Length (in.) — 18 13 — 21 13 — 21 21
Distributor Nozzle Size† — 6 3 — 10 5 — 12 6
Row-Split Coils
No. of TXVs —2 4 —2 4 —2 4
No. of Circuits/Distributor* — 11 11 — 14 14 — 16 16
Suction Connections (in. OD) —1
3
⁄
8
1
3
⁄
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
3
⁄
8
1
3
⁄
8
Distributor Tube Length (in.) — 18 13 — 21 13 — 21 21
Distributor Nozzle Size† — 6 3 — 10 5 — 12 6
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 61 medium face area coil has 6 circuits on each distributor; the lower coil has 6 circuits
on one distributor and 7 circuits on the other 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.
56
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