8
Installing and Piping the Humidifier
STEP 5: Provide Support for Humidifier Body
Suspension from the ceiling is usually best. In all models
except 90 and 91 sizes, there are flanged holes near the top
of the humidifier body for mounting purposes. See drawing on
Page 14.
STEP 6: Bring Steam Supply to the Manifold
as shown in
drawings at right. Be sure steam supply corresponds to
pressure stamped on humidifier. Do NOT use smaller pipe
sizes than shown in the table below for any connections. Take
steam supply line from the top of the supply main—
never
from
the side or bottom. See Steam Pipe Capacities on Page 14.
Expansion and Contraction.
With average length of supply
line, the dimension change from hot to cold should not exceed
2". Provide piping with 3 elbows to get swing to take care of
expansion and contraction.
STEP 7: Connect Manifold to Humidifier
as shown at the
left for the installation method you are using., Piping shown in
dotted lines is provided by the contractor. Unthreaded pipe,
size as per above, is used with the slip fitting on body. Do not
insert manifold or pipe more than 1.5" into body as measured
from face of manifold coupler nut. See Figure 9-1.
STEP 8: Install Drip Leg and Armstrong Inverted Bucket
Steam Trap.
Connect to low pressure return.
NEVER
connect
to return line carrying condensate from high pressure traps.
Table 8-1. Basic Dimensions of Installation Methods
Shown in Figure 5-1 and 5-2.
Humidifier Size
M
N
U
Min.
Min.
90 or DSA-90-M
-
5
3
/
8
"
10"
91 or DSA-91-M
2
5
/
8
"
5
11
/
16
"
13
1
/
4
"
92/1200 or DSA-92-M
2
3
/
4
"
8
9
/
16
"
13
1
/
4
"
93/1300 or DSA-93-M
4
3
/
8
"
8
9
/
16
"
24"
94/1400
5
5
/
8
"
12
1
/
2
"
28"
Table 8-2. Recommended Pipe Size
Humidifier Size
Supply
Strainer to
Manifold
Drip
Trap
Header to
Manifold
to Body
Leg
Piping
Strainer
Inlet
90 or DSA-90-M
1
/
2
"
1
/
2
"
1
/
2
"
1"
1
/
2
"
91 or DSA-91-M
3
/
4
"
1
/
2
"
1
/
2
"
1"
3
/
4
"
92/1200 or DSA-92-M
*
3
/
4
"
3
/
4
"
3
/
4
"
1"
3
/
4
"
93/1300 or DSA-93-M
*1
1
/
4
"
1
1
/
4
"
1
1
/
4
"
1
1
/
4
"
3
/
4
"
94/1400
2"
2"
2"
2"
3
/
4
"
*When steam supply is less than 5 psi use one pipe size larger.
Note:
Pitch supply piping to humidifier, 1/2" in 10 feet.
Drain and trap runouts exceeding 30 feet in length.
Avoid sags in piping.
Ream pipe and blow out at full steam pressure before connecting to
humidifier.
Figure 8-1. Typical Runout at End of Header
Figure 8-2. Long Runout
Figure 8-3. Runout with Pressure Reducing Valve
Figure 8-4. Single Runout to Multiple Humidifiers
Figure 8-5. Models 93/1300 and 94/1400 High Capacity vs. Low Capacity Piping Options
Steam Supply and Condensate Drainage Piping for the
Armstrong Humidifier
