9
Figure 9-3. Compressed air hook-up for humidifiers
utilitzing two Armstrong Duct Humidity Controllers,
one as the humidity controller, the other as a high
limit controller.
Figure 9-2. Compressed air hook-up for air operated
humidifiers incorporating safety interlock for shut down
in the event of power failure to fan.
NOTE: The Armstrong CS Series, EHU-600 Series, and EHU-700 Series Humidifiers, along with the
Armstrong HC-4000 Series HumidiClean and GFH Series Gas Fired HumidiClean can be used in conjunction
with the HumidiPack. The HumidiPack will not include the control valve, steam traps or strainer in these
applications. (HumidiPackPlus is not compatible with these humidifiers.)
Step 9A: Install Pneumatic Piping in accordance with Figures 9-1, 9-2, or 9-3 or engineer’s layout.
a. Control Air Supply. Unless otherwise specified, air supply for Armstrong Humidifiers
should be 20 psig maximum. This air must be clean and dry.
b. Air Piping. ¼” plastic tubing or equivalent is recommended for all air connections.
Step 10A. Install and Connect Humidity Controller as specified by the design engineer in accordance with
manufacturer’s instructions. If location is not specified, it may be installed in the area controlled or in either the
return air or exhaust air ducts.
Auxiliary Controls
High Limit Duct Humidity Controller. A high limit humidistat is recommended downstream from the
HumidiPack panel. The location of the high limit humidistat should be beyond the wetable vapor distance but
not beyond any filters. The purpose of the high limit humidistat is to override the controlling humidistat. This
high limit humidistat automatically prevents local saturation at the point of steam introduction. It also prevents
overloading the duct with vapor in the event of failure of air conditioning system components, incorrect control
settings, or tampering. See Figure 9-3.
Interlocks for Shutdowns. Humidifiers should be interlocked with fans for shutdown on power failure or other
system trouble. Interlock should be such that control valve will bleed its control air to atmosphere on a system
shutdown rather than be locked in its position at time of shutdown. See Figure 9-2.
Figure 9-1. Standard compressed air hook-up for
pneumatic control.
Armstrong
Control Valve
Humidity
Controller
Duct High Limi
Humidity Controller
Gauge
Shut Off
Valve
Main Line
15 P.S.I.
Line In
120V or 240V
Electric Pneumatic
Valve (120V or 240V)
Armstrong
Control Valve
Humidity
Controller
Main Line
15 P.S.I.
Gauge
Duct
Fan Motor
Armstrong
Control Valve
Main Line
15 P.S.I.
Duct Hi
h
Limit Humidity
Controller
Duct
Humidity
Controller
Shut Off
Valve
Gauge
R
RS
S
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