Series EHU-700 Electronic Steam Humidifier

Series EHU-700 Electronic Steam Humidifier
Series EHU-700 Electronic Steam Humidifier
Accurate Humidity Control with Virtually No Manual Adjustment
The Armstrong EHU wraps up accurate control and reliability
in a well-designed package that’s just too smart to be imitated.
No other electronic humidifier does a better job of stabilizing
and simplifying humidity control. That’s because only Armstrong
offers full modulation and a patented self-regulating maximum
output feature. It’s an exclusive combination—and powerful
peace of mind when it comes to humidification.
When you install an Armstrong Series EHU Electronic Steam
Humidifier, you can forget about tiresome manual adjustment
and messy trial-and-error maintenance. A free videotape
­(available upon request) clearly explains proper installation,
operation and maintenance procedures. So you get accurate,
automatically adjusted humidity control that’s virtually hands-free.
Self-Diagnostics. Now, That’s Smart…
Very sensible indeed. Internal software routines automatically
monitor the operation of the HumidiMinder and display
­messages to indicate the condition. The unit will report on 10
different conditions.
The Series EHU Humidifiers come in conveniently sized m
­ odels.
The largest provides steam output up to 240 lb/hr. No matter
which unit you choose, you’ll get the benefits of Armstrong’s
more than 60 plus years of problem solving ­experience in steam
humidification.
…And Sensible Protection, Too
Accurate, reliable humidity control is a sensible precaution to
protect your investment in materials, equipment and personnel.
Increasing the temperature of indoor air without adding
moisture decreases its relative humidity (RH). And when RH
falls to ­levels commonly found in heated indoor environments,
­moisture-retaining materials such as wood, paper, textile fibers
and a wide range of food and chemicals begin to deteriorate.
Dry air can also increase static electricity buildup, which may
actually sabotage production and office equipment. Computer
rooms, printing operations, clean rooms and laboratories are
especially sensitive to static charges due to parched air.
When humidity levels are not properly controlled, indoor air
quality also suffers. According to ASHRAE Standard 62-1999
on indoor air quality: “…Relative humidity in habitable spaces
preferably should be maintained between 30% and 60%
relative humidity... Steam is preferred as a moisture source for
­humidifiers but care should be exercised to avoid contamination
from boiler water or steam supply additives.”
Indoor air quality, proper control of moisture output, efficiency
and ease of maintenance. Since steam scores high on all of
these factors, a steam humidifier is clearly the best choice. And
an Armstrong EHU may just be the smartest.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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How the Series EHU-700 Works
An Armstrong Series EHU converts ordinary tap water to
steam and distributes it to bring the relative humidity up to the
desired level. It’s ideal for providing humidification where no
steam is available or where a steam source is too remote for
easy or economical piping.
Figure 131-1. 100% demand.
Filling with water. Low, increasing steam output.
The humidity demand, sensed by the humidistat, is indicated
by the EHU demand display. A microprocessor converts this
demand signal into an amperage requirement. The internal
power contactor closes, applying voltage to the electrodes,
and the fill valve begins to fill 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
(Figure 131-1).
When the water level rises, as shown in Figure 131-2,
increased electrical current flows through the water, producing
more steam. This increase will continue until the required
output of steam (i.e. amperage requirement) is reached.
At this point, the fill valve will cycle to maintain the required
amperage. When the humidistat senses the added moisture
in the air, the demand for humidity begins to drop. As the
demand falls, the output of the unit modulates down by
decreasing amperage, and therefore steam flow. The fill
valve can then cycle at the lower steam output (amperage)
requirement.
Figure 131-2. 100% demand. Fill valve cycling to maintain output.
High water level. High, constant steam output.
Figure 131-3 shows what happens when the humidistat
demand ­signal drops below a minimum demand: The
contactor is ­
de-energized, and steam output stops.
A duct high-limit humidistat or an air flow interlock switch
may also stop steam output. These devices prevent excess
moisture and condensation in the duct. The Series EHU
may also be used in combination with an Armstrong EHF-2
or EHF-3 Fan Package for direct area discharge of steam.
A high-water float switch prevents water carryover into the
duct due to too high a water level in the tank. An automatic
drain cycle blows down mineral-laden water to extend tank
life and reduce ­maintenance. An overcurrent protection circuit
will drain water from the tank to reduce current flow and then
de-energize the contactor to stop current flow if overcurrent
still exists. After a period of no demand on the Series EHU700, an “End of Season” drain is initiated to eliminate the
potential for stagnant water to remain in the tank.
Figure 131-3. No demand.
Contactor opens. No steam output.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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Self-Regulation Makes the Armstrong
Series EHU-700 a Smart Choice
Standard full modulation stabilizes humidity.
As room humidity changes, the Series EHU-700 steam output
changes to maintain set point. Since output varies with water
level, the unit need only adjust the tank water level to achieve
continuous modulating output (from 10% to 100% of capacity).
Less efficient units simply turn on and off via a contactor in
response to room changes. Due to its unique full modulating
control feature, the output of the Armstrong Series EHU-700
is continuously adjusted to satisfy the necessary humidity
­requirements. Modulating control also means gradual increases
in amperage.
Exclusive patented self-regulating maximum output
improves control and consistency.
In low-demand situations, oversized units quickly shut down
because a fraction of the output satisfies the requirement. This
on/off behavior is called “hunting” because the unit never finds
its set point. The EHU automatically adjusts m
­ aximum output
in response to the operating history of the demand signal to
­virtually eliminate “hunting.” Working in ­conjunction with full
modulation, this feature provides better control under varying
demands—with no manual adjustment of maximum output
required. See Chart 132-1.
Chart 132-1. This chart represents the patented self-regulating
maximum output of the EHU Series from start-up. To avoid
hunting, the unit gradually increases capacity from 40% of
­maximum to 60% to 80%. In this case, the output satisfies the
humidistat demand at a level below 80% of maximum capacity.
The modulating feature then takes over and controls the unit
output. The self-regulating maximum output can then adjust up
(to 100% in this example) or down (to 60%) as demand history
warrants. The feature intermittently “resizes” the humidifier’s
maximum capacity to avoid hunting and to provide humidity
control.
As we have seen, Series EHU-700 makes steam from ordinary
tap water. That’s why they’re ideal for humidification when
no steam source exists or when providing a steam humidifier
would be too impractical or costly. They’re also ideal because
they come with built-in Armstrong reliability, convenience and
efficiency. See for yourself.
Clean steam discharge
to duct manifold
Fill cup with integral air
gap prevent backflow
into water supply
Locking cabinet
prevents tampering
Lightweight steam
generator is repairable
or replaceable
Large ported single drain
connection (on single
tank units)
Inlet strainer protects
fill valve
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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Standard built-in diagnostics simplify maintenance,
eliminate guesswork.
Internal software routines constantly monitor operating history
of the EHU to detect patterns of abnormal operation. For the
Series EHU-700, standard built-in diagnostics detect small
problems before they become big ones so you can minimize the
cost and expense of repair and cleaning. And in the event of a
serious malfunction—a plugged drain line, for example—the unit
is designed to attempt corrections before automatically shutting
down.
Cleanable tank combines economical maintenance
and convenience.
You can easily disassemble and inspect the Series EHU-700’s
steam generating tank. And thanks to the Dirty Tank Indicator,
you’ll know when to do so. Software routines analyze the
­operating history of the Series EHU-700 over a long period of
time to detect conditions that indicate a need for tank cleaning.
When it is necessary, you have the option to clean the tank or
replace it entirely.
Adapts easily to humidistat signals so it saves you
money.
The standard unit includes the Armstrong modulating control
humidistat. You can easily adjust the unit in the field to accept
any of the following common control signals: on/off (SPST
relay), 1.9-3.9 Vdc, 4-20 milliamp or 0-10Vdc as the main
­control signal. Additional input terminals are provided for on/
off air flow and duct high-limit humidity controls. Advanced
controls include a VAV controls package that can include
a modulating high limit humidistat and outdoor temperature
reset. The s­ etpoint can be adjusted by a dial on the front
cover.
Automatic drain timer balances efficiency and long
operating life.
The Series EHU-700 automatically varies tank flushing based
on the operating history and the water’s mineral content
­(conductivity). The result? Positive, self-regulating mineral
­control that responds automatically to changes in mineral
­accumulation caused by changing water supply or water
­consumption due to varying steam output. For you, that
means simple operation—no controls to set, no seasonal
adjustment—and a long, efficient service life.
Why the Series EHU-700 is Easier to Troubleshoot and Maintain
Running diagnostics.
Standard software routines continually monitor operation
and display coded messages indicating the condition.
Connections to an external alarm circuit are provided.
Under “alarm” conditions noted, a relay contact closes,
allowing ­activation of an external Class 2 device.
Input/Output (I/O) diagnostics.
Installation errors account for most start-up problems. The
I/O circuit diagnostics can help pinpoint simple problems
and avoid unnecessary service calls.
Installation/Operation Video.
A free video tape is available to help ensure proper
installation, operation and maintenance. Contact factory.
Table 133-1. Diagnostic Display
Display
Interpretation
C00
Normal operation
C01
High-water condition
C02
Tank needs cleaning
C03
Interlock circuit open
C04
High-limit stat open
C05
Drain system malfunction
C06
Fill system malfunction
C07
Overcurrent malfunction
C08
Manual tank shutoff
C09
I/O diagnostics
Unit Response
Stop water fill
Alarm
Power off to tank
Power off to tank
Alarm and shutdown
Alarm and shutdown
Alarm and shutdown
Power off to tank
Perform I/O display
Engage the I/O diagnostics
by pressing “Mode Select”
switch until “Diagnostic”
mode indicator light
­illuminates. In sequence,
the unit will automatically:
1. Actuate the fill valve,
drain valve, contactor
and the related indicator
lights.
2. Read and display the
controlling stat signal
as a percentage of
demand.
3. Check the interlock and
high-limit stat circuits
and display any fault
conditions.
4. Return to previous
­operation condition and
display % humidistat
demand.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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The Series EHU-700 is designed to provide maximum flexibility
for steam distribution. Steam can be distributed through an
air-handling system (normally an existing air duct) or directly
into the area being humidified with the Armstrong EHF fan
­packages.
Duct-type distribution.
Where an existing air duct system is available, steam can be
introduced into the duct through steam dispersion tube(s).
(See Figure 134-2.)
The selection of the steam dispersion tube(s) should meet the
duct requirements as noted in Table 134-1. As an example,
if the air duct in which you are installing the humidifier has a
width between 17” and 22”, you should use steam dispersion
tube Model D-1.5. If the steam dispersion tube would be
located below the humidifier (see Figure 134-3), install a drip
leg with water seal.
Area distribution method.
Model EHU-600 or EHU-701 humidifier. The EHF-3 is designed
to be direct mounted on a EHU-703. The EHF-2 and EHF-3
units may be hung on a wall and used in conjunction with any
­appropriate EHU humidifier.
The maximum humidity dispersion capacity of each EHF-2
area fan package is 30 lbs/hr (14 kg/hr). It incorporates a
blower rated at 115 V-1.3 amp. CFM rating is 280 CFM @
1,380 RPM.
The maximum humidity dispersion capacity of the EHF-3 unit
is 120 lbs/hr (54 kg/hr). It incorporates a blower rated at 120
V-2.90 amp. CFM rating is 465 CFM @ 1,530 RPM.
The EHF-2 fan unit has an on-off switch that connects to the
EHU and turns the humidifier on when the fan is on.
Note: The EHF-2 fan unit requires a separate 120 V power
­supply. The electrical power supply of the EHF-2 does not
­connect into the EHU humidifier.
The Armstrong EHF fan packages provide humidity distribution
where an air-handling duct system is not available. The
­attractive EHF-2 unit may be installed directly on top of the
The EHF-3 can be used (upon request) with power supplied to
the EHU through a step-down transformer.
Figure 134-1. EHU Dispersion Tube and
EHU Dispersion Tube with Drain Tube.
Figure 134-2. Duct-type distribution.
For capacities to
40 lb/hr (18 kg/hr)
For capacities above
40 lb/hr (18 kg/hr)
Table 134-1. Selecting Proper Steam Dispersion Tube
Duct Width
Steam Disp.
Steam
Disp. Tube Tube Length
Min.
Max.
Model No.
in
mm
in
mm
in
mm
D-1
12
304
11
279
16
406
D-1.5
18
457
17
432
22
559
D-2
24
609
23
584
34
864
D-3
36
914
35
889
46
1168
D-4
48
1219
47
1194
58
1473
D-5
60
1524
59
1499
70
1778
D-6
72
1829
71
1803
82
2083
D-7
84
2133
83
2108
94
2388
D-8
96
2438
95
2413 106 2693
D-9
108 2743 107 2718 118 2998
D-10
120 3048 119 3023 130 3302
Weight
lb
3
3
4
6
8
9
10
11
12
13
14
Figure 134-3. Model EHU-703 with
steam dispersion tube located below humidifier.
kg
1.4
1.4
2
3
3.6
4
4.5
5
5.5
6
6.4
See Figure 140-1. When unit has maximum capacity of above 40 lbs/hr
(18 kg/hr), use steam dispersion tube with 1/2” drain.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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The following factors must be considered in the selection and
ordering of the proper unit.
1.Capacity required.
You must compute the maximum amount of moisture required to
determine which size unit is necessary.
Refer to the Humidification Engineering section of this
catalog or Armstrong’s Humid-A-ware™ Humidification
Sizing and Selection Software (can be downloaded at
armstronginternational.com) for detailed information on
calculating humidification loads. Humidification loads are
generally sized on a worst case basis where design conditions
exist for a limited time, and do not require a safety factor. Output
ratings for EHU humidifiers are average output. It is normal for
steam output to decrease during and immediately following drain
cycles. Consult your Armstrong Representative or the factory if
this poses a control problem for your system.
Example: Assume the humidification load is 45 lbs/hr, and the
available power supply is 480 V 3-phase. Starting at the top
of the capacity table (Table 136-1, Page 136) and going down
the 480 V c­ olumn, we find the EHU-703 is required. Reading to
the left, we find that current module CM 20 is needed, and the
branch ­circuit should be rated for 25 amps.
­flexibility. The maximum recommended distance for
running ­copper tubing is 40 feet equivalent pipe length.
See Bulletin 527 for additional information.
5.Specify spare steam generator.
If the humidifier is going to be in continuous service on a year
round basis, Armstrong recommends the purchase of a spare
steam generator to minimize the service interruption during
inspection or cleaning.
Duct Unit
6.Specify steam dispersion tube (Table 134-1, Page 134).
Select the proper steam dispersion tube that meets the duct
requirements. As an example, if the air duct in which you are
installing the humidifier has a width between 17” and 22”, you
should use steam dispersion tube Model D-1.5.
7.Specify options required:
„„ Duct high-limit stat (recommended). You may order a duct
high-limit stat. A typical setting for the high-limit stat is 85
­percent RH. Stat opens when relative humidity exceeds
setting.
2.Specify electric characteristics of unit required.
„„ Fan interlock (recommended). A duct pressure switch
may be ordered to activate the humidifier by sensing
airflow in a duct system. The pressure switch prevents
humidifier operation if there is insufficient air movement in
the duct system.
3.Standard humidistat sensing range is 10-90% RH.
Note: Please contact factory for duct applications offering
high static pressure (>4” WC) or velocities over 2000 FPM.
Avoid placing dispersion tube in downward, high velocity
airflow.
4.Use proper connecting materials.
Area Unit
8.Specify the EHF fan package.
Specify the voltage, phase and cycles for unit on the order. Total
amperage must be determined for installation purposes. (See
Capacity Table 136-1, Page 136.)
Specify room- or duct-type humidistat. Or you may provide your
own humidistat and/or controller.
Two short hose cuffs are provided (four with the EHU-704) to be
used with hard copper tube to connect the generator tank to the
steam dispersion tube. Armstrong recommends using insulated
copper tubing. If requested, flexible hose is available (for model
EHU-701) in 10-foot lengths for installations which require
Figure 135-1. EHF-2 fan
package mounted on EHU-701.
Be sure fan package’s capacity matches unit’s capacity.
EHF-2 up to 30 lbs/hr (14 kg/hr).
EHF-3 up to 120 lbs/hr (54 kg/hr).
Figure 135-2. EHF-3 fan package
mounted on wall above EHU-703.
Figure 135-3. Two EHF-3 fan packages
mounted on wall above EHU-704.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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Series EHU-700 Capacities and Electrical Ratings
Table 136-1. Series EHU-700 Capacities and Electrical Ratings
Output Per Hour @ Voltage Shown
Recommended
Nom
Single Phase
Three Phase
Current Branch Circuit
Amp
Module
120
208
240
277
208
240
3461
380
4152
Circuit
Rating
Wire
Breaker lb kg lb kg lb kg lb kg lb kg lb kg lb kg lb kg lb kg
EHU-701 Humidifier (One Small Steam Generator)
7
CM 7
14
15
2 0.9 4 1.8 5 2.3 6 2.7 7 3.2 8 3.6 12 5.4 13
6
15 6.8
12
CM 12 14
15
4 1.8 7 3.2 8 3.6 10 4.5 12 5.4 14 6.3 21 9.5 23 10.4 25 11.3
14
CM 14 12
20
5 2.3 8 3.6 10 4.5 11 5
15 6.8 17 7.7 24 10.9 27 12.2 29 13.2
16
CM 16 12
20
6 2.7 10 4.5 11 5 13 6
17 7.7 19 8.6 28 12.7 30 13.6 33 15
20
CM 20 10
25
— — 12 5.4 14 6.3 16 7.3 21 9.5 24 10.9 35 15.9 38 17.2 42 19
24
CM 24 10
30
— — 14 6.3 17 7.7 19 8.6 25 11.3 29 13.2 42 19 — — — —
32
CM 32
8
40
— — 19 8.6 22 10 26 11.8 33 15 38 17.2 — — — — — —
40
CM 40
8
50
— — 24 10.9 28 12.7 32 14.5 42 19 — — — — — — — —
EHU-703 Humidifier (One Large Steam Generator)
20
CM 20 10
25
— — 12 5.4 14 6.3 16 7.3 21 9.5 24 10.9 35 15.9 38 17.2 42 19
24
CM 24 10
30
— — 14 6.3 17 7.7 19 8.6 25 11.3 29 13.2 42 19 46 20.9 50 22.7
32
CM 32
8
40
— — 19 8.6 22 10 26 11.8 33 15 38 17.2 55 24.9 61 27.7 66 29.9
40
CM 40
8
50
— — 24 10.9 28 12.7 32 14.5 42 19 48 21.8 69 31.3 76 34.5 83 37.6
48
CM 48
6
60
— — 29 13.2 33 15 39 17.7 50 22.7 58 26.3 83 37.6 91 41.3 100 45.4
EHU-704 Humidifier (Two Large Steam Generators)
40
CM 20
8
50
— — 24 10.9 28 12.7 32 14.5 42 19 48 21.8 69 31.3 76 34.5 83 37.6
48
CM 24
6
60
— — 29 13.2 33 15 39 17.7 50 22.7 58 26.3 83 37.6 91 41.3 100 45.4
64
CM 32
4
80
— — 39 17.7 45 20.4 51 23.1 67 30.4 77 34.9 111 50.3 122 55.3 133 60.3
80
CM 40
3
100
— — 48 21.8 56 25.4 64 29 83 37.6 96 43.5 138 62.6 152 68.9 166 75.3
96
CM 48
2
125
— — 58 26.3 67 30.4 77 34.9 100 45.4 115 52.2 166 75.3 182 82.5 199 90.2
NOTES:
lb
480
kg
lb
600
kg
17
29
34
38
—
—
—
—
7.7
13.2
15.4
17.2
—
—
—
—
21
36
42
—
—
—
—
—
9.5
16.3
19
—
—
—
—
—
48
58
77
96
115
21.8 60
26.3 72
34.9 96
43.5 120
52.2 —
27.2
32.7
43.5
54.4
—
96
115
154
192
230
43.5
52.2
69.8
87.1
104.3
54.4
65.3
87.1
108.8
—
120
144
192
240
—
346 Volt units require 346/200 volt 4-wire system.
415 volt require 415/240 volt 4-wire system.
KW rating = humidity output (lbs/hr) x 0.345 (for energy calculations only; not for branch circuit sizing).
1
2
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Suggested Specification for Series EHU-700
Steam humidifier for distribution of humidity (steam vapor) into
air-handling system or directly into space shall be of the selfcontained, electrically 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 shall have modulating control to provide 10% to
100% capacity.
D. Maximum capacity of humidifier shall self regulate with no
manual adjustment.
E. Humidifier shall have tanks that can be taken apart for
inspection, cleaning and, if needed, repair. Alternatively, the
same tank can be disposed of and replaced. The humidifier
shall monitor the tank and the display will indicate when it
is dirty and needs cleaning or replacing.
F. Drain cycle will be self regulating both in frequency and
duration to maximize tank life while minimizing energy
waste. The drain cycle will automatically control mineral
buildup based on water conductivity, humidity demand
history and steam output rate. Drain water will be tempered
by the fill valve.
G.Humidifier shall include “End of Season” drain.
H. Humidifier shall have programmed diagnostics to display
input and output circuit status.
I. Humidifier shall have continuous self diagnostics checking
to monitor the operation of the unit. The unit will shut down
the tank (current to electrodes) to prevent unsafe operation
and a visual display code will indicate cause of failure.
Causes of failure include drain system malfunction, fill
system ­malfunction and overcurrent malfunction.
J. Humidifier shall incorporate a high-water float switch
to mechanically sense a high-water condition. A highwater probe that electrically senses high water will not be
­acceptable.
K. Humidifier will provide a relay contact closure to indicate a
system failure or dirty tank condition. The contact closure
will allow for activation of an external Class 2 alarm device
(customer supplied). Circuit is rated to 1 ampere.
L. Humidifier will have a digital display to monitor unit
­amperage draw, humidistat demand percentage, steam
­output (as a percentage) and diagnostic codes. The display
mode will be user selectable. Lights will indicate fill and
drain valves operation, tank off, high water and display
mode selected.
M.The humidifier fill water line(s) shall have an air gap to
­prevent backflow (siphoning) of contaminated water into the
water supply system.
N. Humidifier shall incorporate electrical terminals for
­installation of controlling stat, duct high-limit stat, fan
­interlock switch, and Class 2 alarm device.
O.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 10’) to adequately span the widest
­dimension of the duct.
P. 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.
Q.Humidifier shall be supplied with two hose cuffs for
­connection to hard copper tube (customer supplied).
R. 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: 2-10 Vdc, 4-20 milliamp and on/off control
(SPST relay).
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
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Dimensional Drawings and Physical Data for Series EHU-700
Table 138-1. Materials and Weights
Materials
EHU-701
EHU-703
EHU-704
Generator Tank
Polypropylene
16 ga Top & Bottom;
Cabinet Material
16 ga Steel
18 ga Sides; Steel
Cabinet Finish
Baked-On Epoxy Enamel Coating
Type 430
Electrodes
Galvanized Carbon Steel
Stainless
Hose Cuffs
EPDM (Ethylene Propylene) Rubber
Dispersion Tube
Type 18-8 Stainless Steel
Duct Model
Dispersion Tube
Type 18-8 Stainless Steel
Area Fan Unit Model EHF-2 and 3
Cabinet
Steel - 18 ga. with Epoxy Enamel Coating
120 VAC, 60 Hz., 1.3 amp
Blower Fan EHF-2
280 CFM @ 1,380 RPM
120 VAC, 50/60 Hz., 2.9 amp
Blower Fan EHF-3
465 CFM @ 1,530 RPM*
Weights
Approximate
Maximum
Model No.
Shipping Weight
Operating Weight
EHU-701
60 lb
27 kg
80 lb
36 kg
EHU-703
83 lb
38 kg
113 lb
51 kg
EHU-704
95 lb
43 kg
158 lb
72 kg
EHF-2 Package
33 lb
15 kg
32 lb
15 kg
EHF-3 Package
34 lb
15 kg
33 lb
15 kg
*208, 240, 480 and 600 VAC available
Table 138-2. Physical Data
EHU-701
EHU-703
EHU-704
in
mm
in
mm
in
mm
“A” Width
18
457 19-1/2 495 33-1/2 851
“B” Height
23
584
31
787
31
787
“C” Depth
11-1/2 292
14
356
14
356
“D” Tank Drain (Side)
6-5/8
168 3-1/4 83 3-1/4 83
“E” Tank Drain (Front)
10-5/16 262 14-3/4 375 14-3/4 375
“G” Tank #2 Drain
N/A
N/A
N/A
N/A 28-3/4 730
“H” Steam Outlet #1
12-1/2 318 12-1/2 318 12-1/2 318
“I” Steam Outlet #2
N/A
N/A
N/A
N/A
14
356
“J” Supply Water (Side)*
8-1/4
210 9-1/4 235 9-1/4 235
“K” Supply Water (Front)
15-1/2 394 3-3/4 95 3-3/4 95
“L” Electrical Power (Side)
3-1/8
79
2
51
2
51
“M” Electrical Power (Front) 4-1/2
114 2-1/2 64 2-1/2 64
“N” Fan Height (EHF-2)
13
330
N/A
N/A
N/A
N/A
“N” Fan Height (EHF-3)
16
406
16
406
16
406
*Water connection is 3/8” (10 mm) copper compression fitting.
Figure 138-1. General Installation Concept
Electronic steam humidifiers must be installed in locations
that allow routine inspection and accessibility for maintenance
­operations.
Do not place electronic steam humidifiers in locations where
unusual instances of malfunction of the humidifier or the system
might cause damage to non-repairable, unreplaceable, or
­priceless property.
Proper installation of electronic steam humidifiers discharging
to air handling systems should always include a high limit
humidistat and an air proving switch or fan interlock.
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
138
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Armstrong International - EU
armstronginternational.eu
Armstrong International - China
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Armstrong International - India
armstronginternational.in
Armstrong International, Korea
armintl.co.kr
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Figure 139-1. Model EHU-701
with EHF-2 Fan Package —
Front View
Figure 139-2. Model EHU-701
with EHF-2 Fan Package —
Side View
Figure 139-3. Model EHU-703 — Front View
Note: The EHF-3 is a remote mounted direct discharge unit.
Figure 139-4. Model EHU-704 — Front View
Figure 139-5. Model EHU-703
and 704 — Side View
Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.
Armstrong International - NA
armstronginternational.com
Armstrong International - EU
armstronginternational.eu
Armstrong International - China
armstronginternational.cn
Armstrong International - India
armstronginternational.in
Armstrong International, Korea
armintl.co.kr
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