Installation and Maintenance
EHU-600 Series Humidifiers
5
recommended branch wire and fuse. See Sections 7, 8 and 9 for
control wiring information. A complete wiring diagram as shown in
Section 11 is located inside the door of the humidifier.
Wiring to the low-voltage controls should not run in the same conduit as
the power supply wiring because faulty signals could result. Shielded
cable is recommended.
Important: Please observe the following:
a.
Make certain there is a manually operated interlocking circuit
breaker or safety switch (not furnished) in the electric power
supply Located close to and within sight of the
humidifier.
b.
Disconnect the electric power supply at this circuit breaker or
switch whenever the unit is inspected or serviced. Do not use
the switch on the humidifier because this switch
disconnects the steam generator tank only.
c.
The voltage and phase of the unit must correspond to the
available voltage and phase.
d.
The fuse main breaker must be of sufficient size to handle the
maximum fuse rating as indicated on the specification label on
the unit.
e.
Ground the humidifier cabinet; a ground lug is provided in
the wiring compartment.
f.
Use only wire with copper conductors rated 90
o
C or higher
for high voltage and grounding.
g.
Avoid running high voltage wire next to PC board. Use bottom
knockout for high voltage wire inlet.
3.
Water Fill Supply
a. Only ordinary (potable) tap water should be used. Do not use
brackish or contaminated water.
b. Softened water may not be suitable. The softening process
can produce treated water with conductivity too high.
c.
Demineralized, deionized or distilled water is not recommended
unless it is blended with tap water. Consult factory if you have
one of these water supplies.
d. Humidifier maintenance and performance can be affected by
water quality. Ideal water conductivity is 200 to 400 micromhos.
Depending on the application (voltage, capacity, etc.), water
conductivities between 50 and 800 micromhos have been used
successfully. Please consult factory if micromhos are over
800. If unsure of water conductivity, Armstrong will test free of
charge. Consult factory.
e. Connect the water supply to the 3/8" tube compression fitting
on the fill valve adapter.
f.
Connect the unit to the building water supply (20 to 125 psig
pressure). Install a shut-off valve near the humidifier.
Figure 5-1: Mounting Brackets and
Bolt Locations
EHU-602
EHU-601
8-7/16
2-15/16
6-15/16
12
1/4
13
16
29-7/8
12
2 x
B
1/4
5 x
B
7/16
1-1/2
7/16
7/16
8-7/16
16
16-7/8
B
1/4
2 x
B
7/16
11/32
1-1/2
7/16
1/4
