Armstrong World Industries EHU-703 User Manual
Page 7
6) WATER FILL SUPPLY
Connect the unit to the building water supply (25 to 125 psig pressure). Install a shut-off valve
near the humidifier. Connect the water supply to the 3/8" tube compression fitting on the fill valve
adaptor.
NOTE:
ORDINARY (POTABLE) TAP WATER IS RECOMMENDED. IF POTABLE WATER IS NOT
AVAILABLE, CONSULT THE FACTORY (SEE "WATER QUALITY AND TREATMENT SECTION OF
THIS MANUAL, PAGE 23, FOR MORE INFORMATION). DO NOT USE BRACKISH OR CONTAMI-
NATED WATER.
7) CONNECT
DRAIN
Connect to a suitable waste draining
system. Use the clear drain hose provided
and a 1" copper pipe (Figure 7-1), pitched
1"per foot. The drain water may be as hot
as 160°F. Drain it where it will not present a
hazard to personnel. An air gap to prevent
backflow is required if drain water is
required to be less than 140°F, use
of Temp-R-Drain will be required.
8) INSTALL THE
STEAM
DISPERSION TUBE NOTE: Please
contact factory for duct applications
offering high static pressures (>4"WC).
a. Verify that the proper length and type of
steam dispersion tube has been selected:
See Chart 7-1 for proper dispersion tube
lengths. The low capacity dispersion
tube (Figure 7-2) is sloped toward the
generator to allow for gravity drainage.
On applications where the humidifier output
capacity is greater than 40 Ibs/hr, a high
capacity tube with a ½"O.D. drain tube
must be used (Figure 7-3). Drain tube must
have minimum 6" water seal (see Fig. 8-3).
b. Select a location on the duct that provides
adequate length for vapor mixing and the
shortest connection length for vapor
mixing and the shortest connection length
to the humidifier. Preferably the location
should be 6" downstream and/or 10 feet
upstream from any dampers, vanes, bends
in the duct, or controllers (i.e. high limit stat).
See page 10 for details. Do not install the
dispersion tube into ducts in which airflow
exceeds 2,000 fpm. Do not restrict airflow in
ducts with a depth of 8 inches or less.
Avoid placing manifold in downward, high
velocity air flow as dynamic air pressure will
restrict steam flow.
7
1" I.D. Clear Hose
Supplied with Unit
Fit Hose Inside
1-1/2" Pipe
1" or Larger
Copper Pipe
L
For Steam Capacity
40 lb/hr or Less
5.25
6.00
6.00
Ø
.22
4 Places
5.25
Ø
1.75
Hole in Duct
6.00
6.00
R.88
3.50
1.50
Ø
.22
4 Places
1.00
5.25
R.37
5.25
2.00
3.50
For Steam Capacity
Above 40 lb/hr
Hole in Duct
L
Figure 7-1
Chart 7-1. Selecting Proper Steam Dispersion Tube
Steam
Steam Disp.
Duct Width
Weight
Disp. Tube
Tube Length
Min.
Max.
Model No.
in
mm
in
mm
in
mm
lb
kg
D-1
12
304
11
279
16
406
3
1.4
D-1.5
18
457
17
432
22
559
3
1.4
D-2
24
609
23
584
34
864
4
2
D-3
36
914
35
889
46
1168
6
3
D-4
48
1219
47
1194
58
1473
8
3.6
D-5
60
1524
59
1499
70
1778
9
4
D-6
72
1829
71
1803
82
2083
10
4.5
D-7
84
2133
83
2108
94
2388
11
5
D-8
96
2438
95
2413
106
2693
12
5.5
D-9
108
2743
107
2718
118
2998
13
6
D-10
120
3048
119
3023
130
3302
14
6.4
Figure 7-2
Figure 7-3