Installation and Maintenance
EHU-600 Series Humidifiers
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2.
Suggested Specification
Steam humidifier for distribution of humidity (steam vapor) into air handling system or directly into space
shall be of the self-contained, electronically controlled design.
a.
Humidifier shall generate steam from ordinary tap water.
b.
Humidifier(s) shall have all internal components contained in a steel cabinet with a key-locked
access door to prevent unauthorized access.
c.
Humidifier(s) shall be UL and CUL listed.
d.
Humidifier shall have modulating control to provide 10 to 100% capacity.
e.
Maximum capacity of humidifier shall self regulate with no manual adjustment.
f.
Humidifier shall have steam generator(s) that can be taken apart for inspections and cleaning, or
if needed, replacement of internal parts.
g.
Drain cycle will be self regulating for automatic control of mineral (conductivity) buildup.
h.
Humidifier shall have programmed diagnostics to confirm that input and output circuits are func-
tioning.
i.
Humidifier shall incorporate a demand meter to display status of main control humidistat signal.
j.
The electronic circuit shall provide automatic protection from excessive current and high water
overflow.
k.
The humidifier fill water line(s) shall have an air gap to prevent backflow (syphoning) of contami-
nated water into the water supply system.
l.
Humidifier shall incorporate electrical terminals for installation of controlling stat, duct high-limit
stat and fan interlock switch.
m. Humidifier shall be supplied with stainless steel steam dispersion tube(s) which provide uniform
steam distribution over the entire tube length and shall be supplied at various lengths (through
6 feet) to adequately span the widest dimension of the duct.
n.
When applicable, humidifier(s) shall have provisions for discharging steam vapor directly into
room area using factory available fan distribution units as an accessory. These units shall be
designed for either remote mounting or fit directly on top of humidifier.
o.
Humidifier shall be supplied with two hose cuffs for connection to hard copper tube (customer
supplied). 1 1/2" ID flexible rubber hose shall be available as an optional item.
p.
Humidifier shall be supplied with a humidistat capable of modulating the steam flow, or be capable
of working with the following common control signals without factory modification: 0-135 ohms,
2-10 Vdc, 4-20 milliamp and on/off control (SPST relay).
