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Limited Warranty and Remedy
Armstrong International, Inc. (“Armstrong”) warrants to the original user of those products supplied by it and used in the service and in the manner
for which they are intended, that such products shall be free from defects in material and workmanship for a period of one (1) year from the date of
installation, but not longer than 15 months from the date of shipment from the factory, [unless a Special Warranty Period applies, as listed below].
This warranty does not extend to any product that has been subject to misuse, neglect or alteration after shipment from the Armstrong factory. Except
as may be expressly provided in a written agreement between Armstrong and the user, which is signed by both parties, Armstrong
DOES NOT MAKE
ANY OTHER REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR ANY IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE
The sole and exclusive remedy with respect to the above limited warranty or with respect to any other claim relating to the products or to defects or any
condition or use of the products supplied by Armstrong, however caused, and whether such claim is based upon warranty, contract, negligence, strict
liability, or any other basis or theory, is limited to Armstrong’s repair or replacement of the part or product, excluding any labor or any other cost to
remove or install said part or product, or at Armstrong’s option, to repayment of the purchase price. As a condition of enforcing any rights or remedies
relating to Armstrong products, notice of any warranty or other claim relating to the products must be given in writing to Armstrong: (i) within 30 days
of last day of the applicable warranty period, or (ii) within 30 days of the date of the manifestation of the condition or occurrence giving rise to the claim,
whichever is earlier.
IN NO EVENT SHALL ARMSTRONG BE LIABLE FOR SPECIAL, DIRECT, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES,
INCLUDING, BUT NOT LIMITED TO, LOSS OF USE OR PROFITS OR INTERRUPTION OF BUSINESS
The Limited Warranty and Remedy terms herein
apply notwithstanding any contrary terms in any purchase order or form submitted or issued by any user, purchaser, or third party and all such contrary
terms shall be deemed rejected by Armstrong.
Special Warranty
Periods are as follows: Series EHU-800 Electric Steam Humidifier, Series HC-6000 HumidiClean Humidifier and GFH Gas Fired Humidifier with Ionic
Beds: Two (2) years after installation, but not longer than 27 months after shipment from Armstrong’s factory.
Principle of operation
CAUTION: Disconnect the electric power supply at the circuit breaker or switch whenever the unit is to be inspected or serviced.
DO NOT USE THE TANK
ON/OFF SWITCH ON THE HUMIDIFIER BECAUSE THIS SWITCH DISCONNECTS THE STEAM GENERATOR TANK ONLY PRINCIPLE OF OPERATION - AN
OVERVIEW
The Armstrong Series EHU-800 electronic steam humidifier converts ordinary tap water to steam and distributes it within the air being humidified to
bring the relative humidity up to the desired level.
The humidity demand is sensed by the humidistat. A microcontroller converts this demand signal into an amperage requirement. If humidistat demand
is above 20%, the internal power contactor closes, applying voltage to the electrodes, and the fill valve opens to begin filling the tank. Water enters the
bottom of the steam generator tank and rises until it reaches the electrodes. Upon contact, electrical current flows through the water, causing it to boil
and produce steam. As the water level rises increased electrical current flows through the water, producing more steam. This increase will continue until
the desired current level (i.e. required steam output) is reached. At this point, the fill valves will cycle off and on to maintain the desired amperage ±5%.
The desired current level is a function of the nominal current rating, humidistat demand, and the automatic capacity adjustment feature.
When the humidistat senses the added moisture in the air, the demand for humidity begins to drop. As the demand drops, the output of the unit is
modulated down by boiling away water and not filling. This allows the amperage to decrease, thereby reducing the steam flow. The fill valve can then
cycle at the lower steam output (current) requirement. When the humidistat demand signal drops below a minimum 25% demand, the contactor is de-
energized, and steam output stops Steam output may also be stopped by a duct high-limit humidistat or a fan interlock switch. These devices prevent
excess moisture and condensation in the duct by opening the tank contactor if there is too much humidity or insufficient airflow within the duct.
A high-water float switch prevents water carry-over into the duct due to an excessive water level in the tank. When the high water limit is reached the
display will read “high Water Level” in the humidifier status menu and the fill valve is blocked until some water is boiled away and the water level drops.
This is common during startup. If the display reads “High Water Level” and the water level is in the lower half of the steam generator, contact the factory
for assistance. This is due to high static pressure. Installation of a fill cup extension kit could be required. If an overcurrent situation is detected, the
overcurrent protection circuit will drain water from the tank to reduce current flow. If the overcurrent persists, the contactor will be de-energized to stop
all current flow.
The Series EHU-800 patented automatic capacity adjustment feature eliminates manual adjustment and improves humidity control. This feature auto-
matically adjusts maximum output up or down depending on the humidity demand history. When the unit is first turned on the maximum output is 40%.
If the demand stays high, the unit automatically steps up the maximum output and will reach 100% maximum output after one hour.. An automatic drain
cycle blows down mineral-laden water to increase steam generator life and reduce maintenance requirements. The frequency and duration of the drain
cycle will vary with supply water conductivity, steam output, and humidistat demand history. When it is initiated automatically, the drain valve cycle oc-
curs at the beginning of a fill cycle. The incoming cold water tempers the drain water to less than 70°C (160ºF) after 72 hours of no demand; the unit will
initiate an “End-of-Season” drain to remove stagnant water.
