EHU-800 Series Humdifiers

EHU-800 Series Humdifiers
EHU-800 Series
Humdifiers
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-800 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 1. 100% demand.
Filling with water. Low, increasing steam output.
The humidity demand, sensed by the transmitter, 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 1).
When the water level rises, as shown in Figure 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 transmitter 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 2. 100% demand. Fill valve cycling to maintain output. High
water level. High, constant steam output.
Figure 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 a high 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 EHU-800, an “End of
Season” drain is initiated to eliminate the potential for stagnant
water to remain in the tank.
Figure 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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EHU-800 Series Features and Benefits
Armstrong has been producing an EHU series for over 35 years with over six different series upgrades. We can truly say the 800
series is the smartest of them all. The brains of this unit is the 24VAC main PC board with an on board controller. The PC board
is connected to the digital display and keypad, making the unit user friendly as well as making a plethora of information visible
on the display. Taking it one step further, this unit also comes standard with native Modbus Controls, which creates a gateway
for the information to be visible on your desktop. See below for some of the Features & Benefits that can be found in the EHU800 series.
Digital Display w/ Keypad: Digital display that has the capability to see 50
different screens from current amp draw to when the unit will drain again, etc.
Self Diagnostics: The unit continuously monitors the operation through selfdiagnostics. If it sees an issue the unit first tries to fix it itself and then if the problem
persist it will display one of eight messages to indicate the condition.
Adjustable Output: The EHU-800 series units are fully modulating, but the unit
also has the ability to limit the maximum output. If anything in your system is
to change such as the CFM, temp, ect, the output of the unit can be capped to
accommodate each application.
Cleanable Tank: The tank provided with the EHU-800 series combines
economical maintenance and convenience. You can easily disassemble and
inspect the steam generator tank. The digital display will also alert when
maintenance is needed. The onboard controller will analyze the amount of run
time based on demand. When it is necessary, you have the option to clean the
tank or replace it entirely.
Standard Communications: As mentioned above, all EHU-800 series units
come standard with Modbus communications (RS485 connection). This allows
the user to communicate with the humidifier through the Building Management
System (BMS). The humidifier can be controlled and monitored from a remote
location. Everything that is accessible through the front display of the humidifier,
will be visible through the BMS. With being native Modbus, the unit can be easily
converted to BACnet or Lonworks with the use of a protocol translator.
Onboard Controller: This series also features an onboard controller, which
gives the user the capability to install sensors instead of a standard humidistat
or modulating high limit. This makes wiring easier as the sensors that are used
to monitor the space conditions with the BMS can also be used to control the
humidifier.
External connections: The water and drain connections
are easily accessible points on the bottom of the unit
to make installation much simpler and easier. This also
eliminates some connection points inside the cabinet to
help reduce the risk of electric failure due to moisture in the
cabinet.
Smaller footprint: Over the years the EHU series
has been the smallest of all the atmospheric steam
generators. The width of the EHU-800 is slightly
smaller than its predecessors, making it even easier
to install.
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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EHU-800 Series Dimesions and Weights
Steam
Outlet (X)
Drain
Outlet (X)
Water
Inlet (X)
Steam
Outlet
Spacing
Drain
Outlet
Spacing
A
B
C
D
E
F
G
H
I
J
K
EHU
801
413
(16.3)
647
(25.5)
253
(9.96)
274
(10.8)
243
(9.56)
93
(3.66)
126
(4.96)
96
(3.78)
188
(7.40)
EHU
803
498
(19.6)
807
(31.8)
358
(14.1)
316
(12.4)
236
(9.29)
451
(17.5)
179
(7.05)
99
(3.90)
293
(11.5)
EHU
804
854
(33.6)
807
(31.8)
358
(14.1)
316
(12.4)
236
(9.29)
451
(17.5)
179
(7.05)
99
(3.90)
293
(11.5)
Output
lbs/hr
Operating
Water
Inlet (X)
Model
Emptying
Drain
Outlet (X)
Weight kg (lb)
Steam
Outlet (X)
Humidifier
Dimensions in mm (inches)
19 (42) 25 (55)
358
(14.1)
518
(20.4)
32
(70)
57
(126)
50
(110)
100
(220)
Single Phase
kg/hr
120
Amp
208
kW
Amp
240
kW
Amp
277
kW
Amp
kW
6.3
1.5
5.4
1.5
EHU 801 (One small generator)
4.4
2
12.5
1.5
7.2
1.5
18.8
2.3
10.8
2.3
9.4
2.3
8.1
2.3
18.1
3.8
15.7
3.8
13.6
3.8
21.7
6.0
6.6
3
11.0
5
17.6
8
11.0
5
17.6
8
28.9
6.0
25.1
6.0
22.0
10
36.1
7.5
31.3
7.5
27.1
7.5
33.1
15
54.2
11.3
47.0
11.3
40.7
11.3
44.1
20
62.7
15.0
54.3
15.0
55.1
25
67.9
18.8
44.1
20
72.3
15.0
55.1
25
90.4
18.8
60.1
30
108.4
22.6
77.2
35
EHU 803 (one large steam generator)
31.3
3.8
EHU 804 (two large steam generators)
78.3
18.8
94.0
22.6
81.4
22.6
109.6
26.3
95.0
26.3
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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EHU-800 Series Capacity Tables
Output
lbs/hr
Three Phase
kg/hr
208
240
Amp
kW
Amp
380
kW
Amp
480
600
kW
Amp
kW
Amp
kW
EHU 801 (One small generator)
6
3
6.3
2.3
5.4
2.3
11
5
10.4
17
8
16.7
3.8
9.0
3.8
5.7
3.8
4.5
3.8
3.6
3.8
6.0
14.5
6.0
9.1
6.0
7.2
6.0
5.8
6.0
22
10
20.9
7.5
18.1
7.5
11.4
7.5
9.0
7.5
7.2
7.5
33
44
15
17.1
11.3
13.6
11.3
10.9
11.3
20
22.8
15.0
18.1
15.0
14.5
15.0
EHU 803 (one large steam generator)
33
15
31.3
11.3
27.1
11.3
44
20
41.7
15.0
36.2
15.0
55
25
45.2
18.8
66
77
28.6
18.8
22.6
18.8
18.1
18.8
30
34.3
22.6
27.1
22.6
21.7
22.6
35
40.0
26.3
31.7
26.3
25.3
26.3
88
40
45.7
30.1
36.2
30.1
28.9
30.1
99
45
40.7
33.8
32.6
33.8
110
50
45.2
37.6
36.2
37.6
55
25
52.2
18.8
66
30
62.6
22.6
54.3
22.6
77
35
73.0
26.3
63.3
26.3
88
40
83.5
30.1
72.3
30.1
99
45
93.9
33.8
81.4
33.8
51.4
33.8
110
50
90.4
37.6
57.1
37.6
121
55
62.8
41.4
49.7
41.4
39.8
41.4
132
60
68.5
45.1
54.3
45.1
43.4
45.1
143
65
74.3
48.9
58.8
48.9
47.0
48.9
154
70
80.0
52.6
63.3
52.6
50.6
52.6
165
75
85.7
56.4
67.8
56.4
54.3
56.4
176
80
91.4
60.2
72.3
60.2
57.9
60.2
187
85
76.9
63.9
61.5
63.9
198
90
81.4
67.7
65.1
67.7
209
95
85.9
71.4
68.7
71.4
220
100
90.4
75.2
72.3
75.2
231
105
95.0
78.9
76
78.9
242
110
79.6
82.7
EHU 804 (two large steam generators)
Recommended Branch Circuits
Rating Amp
Wire
1-12
13-15
16-20
21-24
(AWG)
14
12
10
10
8
8
6
4
3
1
0
(mm2)
3
4
6
6
10
10
16
25
35
50
50
15
20
25
30
40
50
60
80
100
125
150
Circuit Breaker
25-32
33-40
41-48
49-64
68-80
81-100
101-120
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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Typical Specification
Master SECTION 15810
Suggested Specification for EHU-800 Series
HUMIDIFIER
“Electrosw Type or Canister Humidifier”:
PART 1, GENERAL
Steam humidifier for distribution of humidity (steam vapor) into airhandling system or directly into space shall be of the self-contained,
electrically controlled design.
1.01 WORK INCLUDED
A. Steam Humidifier, Control Cabinet, Piping
and Controls.
1.02 RELATED WORK
A. Electrical distribution Division 16000
B. Plumbing water distribution and drainage.
Section 15400
C. Ductwork Insulation. Section 15290
D. Air Handling Section 15850
1.03SUBMITTALS
A. Submit shop drawings and product data
under provisions of Section 01300.
B. Shop drawings shall indicate assembly,
dimensions, weights, construction details and
all field connection details and all mounting and
housing details.
A.Humidifier shall generate steam from ordinary tap water.
B.Humidifier shall have modulating control to provide 20% to 100%
capacity. Maximum capacity of humidifier shall self regulate with no
other manual adjustment.
C.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 digital display will indicate when it is dirty and needs cleaning or
replacing.
D.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.
E.Drain water will be tempered by the fill valve.
F.Fill and drain connections to be located outside of the cabinet.
C. Product data shall indicate dimensions,
weights, capacities, ratings, construction
details, electrical characteristics.
G.Digital display and keypad functions to include:
D. Submit manufacturer’s installation
instructions and operating and maintenance
manuals.
3. Error log
1.04 DELIVERY, STORAGE AND HANDLING
A. Deliver products to site in factory fabricated
protective containers.
B. Store in a clean dry place and protect
from weather and construction traffic, handle
carefully to avoid damage to components,
enclosures and finish.
1.05 ENVIRONMENTAL CONDITIONS
A. Do not operate unit for any purpose,
temporary or permanent until all water supply
and drainage connections have been made and
all safety controls are functioning properly.
1.06WARRANTY
A.Provide manufacturer’s two year standard
warranty.
PART 2, PRODUCTS
2.01 ACCEPTABLE MANUFACTURERS
A. Armstrong
2.02 STEAM GENERATOR TYPE HUMIDIFIERS
1. Displayed diagnostics
2. Ability to limit max output
H.Humidifier shall have continuous self-diagnostics checking to monitor
the operation of the unit.
I. The unit will shut down the tank (current to electrodes) to prevent
unsafe operation and the display 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 high-water 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 unit status menu that will display unit amperage
draw, humidistat demand percentage, steam output (in lb/hr) as well as
fill and drain valve operation and high water.
M. Humidifier shall incorporate electrical terminals for installation of
controlling humidistat, high limit humidistat, fan interlock switch, and
Class 2 alarm device.
N.Humidifier is interoperable through native MODBUS communications
protocol. Upon request, humidifier may be supplied with BACnet or
LonWorks communications protocol.
O.Humidifier is field adaptable to utilize onboard controller for use with
0-5Vdc, 0-10Vdc, 4-20mA sensors or can accept an input signal from
external controller/humidistat (0-5Vdc, 0-10Vdc, 4-20mA or on/off).
P. The humidifier fill water line(s) shall have an air gap to prevent backflow
(siphoning) of contaminated water into water supply system.
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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Typical Specification
Optional points:
PART 3, EXECUTION
1.
3.01INSTALLATION
3.
Humidifier(s) shall have all internal components
contained in a steel cabinet with a key-locked
access door to prevent unauthorized access.
Humidifier shall be supplied with two hose cuffs
for connection to hard copper tube (customer
supplied)
4.
Dispersion Devices
a.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.
b.Humidifier shall be supplied with HumidiPack
prefabricated separator/header and multiple
dispersion tube assembly designed for the
application in order to shorten the non-wettable
vapor trail.
c.When applicable, humidifier 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 remote mounting from the
humidifier.
A.Install Armstrong humidifiers as indicated on drawings and
as indicated in schedules in accordance with manufacturer’s
instructions.
3.02 MANUFACTURERS FIELD SERVICES:
A.Supply services of factory trained representative to check
installation for compliance with manufacturer’s requirements and to
supervise start-up and testing of humidifiers.
3.03DEMONSTRATION
A.Demonstrate all humidifiers to be fully functional. See 15990 for
testing procedure.
END OF SECTION 15810
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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Armstrong provides intelligent system solutions that improve utility performance, lower energy consumption,
and reduce environmental emissions while providing an “enjoyable experience.”
Armstrong International
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Designs, materials, weights and performance ratings are approximate and subject to change without notice. Visit armstronginternational.com for up-to-date information.Bulletin 552
Printed in U.S.A. - 4/14
Armstrong,
816 Maple
Street,
Three Rivers,
269-273-1415,
269-278-6555
© 2014 Armstrong International, Inc.
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