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IM 830-6
Direct Expansion (DX)
Notes:
1. Unless otherwise noted left hand connections
are the same as right hand connections.
2. Right-hand connections shown in figures.
3.
R
= Return,
S
= Supply,
L
= Liquid Line,
S
= Suction Line,
EH
= Electric Heat
4. Numerical codes [#] denote optional stain-
less steel drain pan (cooling coils).
Figure 48: Direct Expansion with Hot Water Unit
(Cooling Coil G[9]) (Heating Coils 65, 66, 67)
Note:
Direct Expansion (DX) coils have female sweat
connections. Interconnecting tubing is by others.
for correct tubing size.
Figure 49: Direct Expansion and Steam Unit
(Cooling Coil G[9]) (Heating Coils, 68, 69)
Note:
Direct Expansion (DX) coils have female sweat
connections. Interconnecting tubing is by others.
for correct tubing size.
Table 9: DX Coil (G) Connection Tubing
Unit Series
H07, V07
H10, V10
H13, V13
H15, V15
Suction Line O.D.
inches (mm)
3/4" (19)
3/4" (19)
7/8" (22)
7/8" (22)
Liquid Line O.D.
inches (mm)
3/4" (6.35)
1/4" (6)
3/8" (10)
3/8" (10)
Notes:
1.
All coils have the same end supply and return connections.
2.
All water stubs are
⅞
" I.D. (female) sweat and all steam coils are
1
⅛
" (female) sweat connections. All coil connections terminate 9"
(229mm) from the end of the unit.
Figure 50: Direct Expansion and Electric Heating Unit
(Cooling Coils G[9]) (Heating Coils 12, 13)
Table 10: Heat / Cool Coil Position / Combinations In Air Stream
First Position in Air Stream
Second Position in Air Stream
68, 69
G, 9
G, 9
12, 13
65, 66, 67
G, 9
Heating Coils
Cooling Coils
65 = 1 Row Hot Water Coil
G or 9 = Direct Expansion Coil
66 = 2 Row Hot Water Coil
67 = 3 Row Hot Water Coil
68 = Low Capacity Steam Coil
69 = High Capacity Steam Coil
12 = Low Electric Heat Coil
13 = High Electric Heat Coil