Herrmidifier Dual Pneumatic - Manual (Page 6)

Dual-Pneumatic
I n s t a l l a t i o n , O p e r a t i o n & S e r v i c e M a n u a l
IV. PLUMBING
Each cabinet has an air inlet, water inlet, air outlet, water
outlet and a drain. All air connections are ¾” and all water
connections, including drain, are ½”.
1. Drain loop must extend 3” above highest location of
heads or water outlet port on cabinet. This loop allows
water pressure to be relieved on system shutdown while
maintaining water volume inside piping.
2. Piping from control cabinet to manifolds should be ¾”
for the air and ½” for the water piping unless otherwise
shown on your job specific drawings provided for your
project.
NOTE: Inlet water pressure must be in range of 50-100 psig.
Consult the factory if you are outside this range.
Supply Power
1. Supply power of 120 VAC, 5 amps is required.
2. Field wiring of the main power supply is connected
directly to the terminal strip in the control cabinet. A
ground lug is provided for the ground wire.
3. Install external over current protection and provide wiring
in accordance with the NEC, state and local codes.
4. Power supply must be “clean”; free of spikes, surges
and sags; +10%, -15% of nominal. Ground should be
true earth ground.
V. CONTROLS
Controls may be supplied by the factory or others. The
following information applies to all controls factory supplied
or furnished by others. All external electrical control
circuits are to be connected to the unit using the terminal
strip located in the electrical compartment. Field wiring
from humidistat to humidifier and between safety devices,
such as high limit humidistat and air proving switches,
should be 18 AWG stranded or 20 AWG solid wire. Wall
devices should be mounted at a height similar to that of
a typical thermostat and should be located in an area
that will provide good representation of the overall space
being humidified. Do not mount wall devices directly in
the air stream of a supply grille or room distribution unit.
Control Circuit Connections
ON/OFF
1. Control Input - Unit will operate with any two-position
device. Demand for humidity will close the contact.
2. Limit Input - Unit will operate with any two-position
device. The humidistat contact will open on humidity
rise.
WARNING
Do not mount any controls inside the unit or tap power
from any location in the unit, except as stated in these
instructions. Do not place objects near the cabinet. Do not
attach to dry wall without studs.
CAUTION
Any minerals that are in the water will be injected into the
airstream. Your application/process may require some
means of air or water filtration to complete a successful
application. Consult the factory if you should have any
questions. Softening the water only increases the TDS level.
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