7
Steam
Dispersion
Tube
Selection
Table 7-1
Area Steam Distribution
The EHF-3 fan package (minimum of 2 required for HC-4500) is designed to be hung on a wall to
operate as a remote mounted, direct area discharge option. It incorporates a blower rated at 120v-
2.90 amps. CFM rating is 465 @ 1530 RPM. The fan package requires a separate 120 volt power
supply (optional stepdown transformer available). Consult Armstrong Installation Bulletin IB-95 for
more information.
Alternative for shortened non-wettable vapor trail
For applications with particularly limited downstream absorption distance, Armstrong HumidiPack
may be considered. HumidiPack is a prefabricated separator/header and multiple dispersion tube
assembly. It provides uniform distribution and shortened non-wetting vapor trail. Consult
Armstrong Installation Bulletin No. 560 for more information.
Control Wiring
Wiring for low voltage controls should not be run in same conduit as the power supply. Use of
shielded wire or a separate dedicated metal conduit is required. When shielded cable is used,
shield is to be grounded at the humidifier only. Refer to Figures 8-1 and 8-2 for wiring schematics.
Control Humidistat
1. Locate control humidistat where it will sense the average air condition of the space to be
humidified. Avoid areas of restricted circulation or locations where the sensor will be
subjected to drafts, localized heat or moisture sources.
2. Optional duct mounted humidistats are available to sense return or exhaust air, if preferred.
3. Set DIP switch S-3 in upper left portion of the PC board to proper range for the
humidistat control signal to be used. See Figure 9-1 and 22-1. Also set voltage source
jumper (J3) to proper range. See Fig. 9-1 for location of switches plus Figure 22-1
and applicable wiring diagram on Page 8 for correct switch setting.
4. Wire standard Armstrong 0-10 Vdc humidistat as shown in Figure 8-1. For use of
alternative humidistats, please refer to Figure 8-2.
Min. [cm]
Max. [cm]
D-1
DL-1
12" [30]
11" [28]
16" [41]
D-1.5
DL-1.5
18" [46]
17" [43]
22" [56]
D-2
DL-2
24" [61]
23" [58]
34" [86]
D-3
DL-3
36" [91]
35" [89]
46" [117]
D-4
DL-4
48" [122]
47" [119]
58" [147]
D-5
DL-5
60" [152]
59" [150]
70" [178]
D-6
DL-6
72" [183]
71" [180]
82" [208]
D-7
DL-7
84" [213]
83" [211]
94" [239]
D-8
DL-8
96" [244]
95" [241]
106" [269]
D-9
DL-9
108" [274]
107" [272]
118" [300]
D-10
DL-10
120" [305]
119" [302]
130" [330]
HC-4100,
HC-4100 DI,
HC-4145 and
HC-4145 DI Model
"D" Dia.
HC-4100,
HC-4100 DI,
HC-4145 and
HC-4145 DI Model
1-1/2"
2-3/8"
Duct Width
Steam
Dispersion
Tube Length
(L) [cm]
HC-4300,
HC-4300 DI,
HC-4500 and
HC-4500 DI Model
"D" Dia.
HC-4300,
HC-4300 DI,
HC-4500 and
HC-4500 DI Model
