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EHU-703
User Manual
40 pgs676.6 Kb0

Armstrong World Industries EHU-703, EHU-701, EHU-700, EHU-704 User Manual

Installation and Maintenance
Series EHU-700 Humidifiers
Please Read And Save These Instructions
The Armstrong Series EHU-700 humidifier is an electronically controlled, non-pressurized steam-generating humidifier, with its vapor discharged into a duct of an air-handling system or through a fan package. The Armstrong Series EHU-700 consists of three models: The EHU-701, 703 and 704. The maximum capacity of the series is 240 Ibs/hr.
Bulletin 527-G
DANGER
ELECTRICAL SHOCK HAZARD
HIGH VOLTAGES EXIST INSIDE THE HUMIDIFIER
To protect yourself and others from accidental shocks:
1. Keep the humidifier locked during normal operation and store the key in a safe location away from the humidifier.
2. ALWAYS DISCONNECT THE POWER SUPPLY AT THE CIRCUIT BREAKER OR SAFETY
SWITCH BEFORE OPENING ANY COVERS!
3. Before servicing the humidifier, learn where the high voltage parts are. KEEP HANDS AND METAL TOOLS AWAY FROM THESE AREAS!
Figure 2-1 Figure 2-2
2
TABLE OF CONTENTS
3
SECTION 1: PREPARATION AND INSTALLATION
WARNINGS.................................................................................................................. 2
PRE-INSTALLATION................................................................................................... 4
Check shipment................................................................................................ 4
Check local codes............................................................................................ 4
Site selection.................................................................................................... 4
INSTALLATION........................................................................................................... 6
Mounting........................................................................................................... 6
Electrical wiring................................................................................................ 6
Water supply..................................................................................................... 7
Drain connection............................................................................................... 7
Steam dispersion tube...................................................................................... 7
Control wiring.................................................................................................... 9
High limit humidistat......................................................................................... 11
Airflow switch.................................................................................................... 11
Audible alarm.................................................................................................... 12
Wiring diagram.................................................................................................. 12
SECTION 2: START-UP AND OPERATION
DISPLAY (INSTRUMENT) PANEL............................................................................... 13
START-UP PROCEDURE.............................................................................................. 14
SECTION 3: TROUBLESHOOTING AND MAINTENANCE
TROUBLESHOOTING GUIDE..................................................................................... 17
Principle of operation......................................................................................... 17
Operational guidelines....................................................................................... 18
Diagnostics......................................................................................................... 20
WATER QUALITY AND TREATMENT.......................................................................... 23
General.............................................................................................................. 23
Conductivity too low........................................................................................... 23
Conductivity too high......................................................................................... 24
MAINTENANCE............................................................................................................ 25
Parts................................................................................................................... 25
Recommended maintenance............................................................................. 29
Steam generator maintenance, general............................................................ 29
Tank removal and replacement......................................................................... 30
Chemical tank cleaning..................................................................................... 31
Fill and drain valve repair................................................................................... 33
TANK DISASSEMBLY,
ELECTRODE REPLACEMENT.................................................................................... 33
EHU-703,704..................................................................................................... 33
EHU-701, single and three phase...................................................................... 34
HUMIDISTAT DATA...................................................................................................... 36
Autocal Procedure............................................................................................. 36
Sensor Failure Protection.................................................................................. 36
High Limit Humidity Sensor .............................................................................. 38
Humidity Set Point Reset by Outside Temperature .......................................... 38
PRE-INSTALLATION
1) CHECK SHIPMENT
A claim should be filed with the transportation company (and reported to Armstrong) if any items are missing or damaged. Your shipment will arrive in two or three cartons.
One carton holds the humidifier with the steam generator installed, the control humidistat and sensing element, two short steam hoses, hose clamps, mounting plate and lag screws, and a clear drain hose. If you have ordered a duct pressure switch or a high limit stat, these too will be in the humidifier carton.
The steam dispersion tube(s) and fittings are contained in another carton ( two for the EHU 704).
Two complete sets of installation instructions have been shipped with your unit. One is for the installer's use. The second is for the owner's files.
2) CHECK LOCAL CODES
Series EHU-700 humidifiers should be installed in
accordance with ALL
applicable building, plumbing, and electrical codes.
3) SITE SELECTION
Electronic steam humidifiers must be installed in locations that allow routine inspection and accessibility for maintenance operations. See Figures 4-1 & 4-2 for access space.
Do not place electronic steam humidifers in locations where unusual instances of malfunction of the humidifier or the system might cause damage to non-repairable or un-replaceable, or priceless property.
4
e
s
Connection Access
2 G T
4 C
Figure 4-2. EHU-703/704
Figure 4-1. EHU-701
4" Min. Steam
enerator
ank Removal
" Side
learance
24" Front Clearance
4" Side Clearanc Both Side
5" Min. Drain
24" Side Clearance
5" Min. Drain Connection Access
The mounting surface should be a wall capable of supporting the maximum humidifier weight. The maximum operating weight is:
The location chosen should be inside with a minimum ambient temperature of 40°F. and a maximum of 100°F. The humidifier should not be mounted on hot surfaces.
The location should be close enough to the air duct so that the length of steam pipe is as short as possible. A length of 10 ft. or less is ideal; the maximum recommended length for running distribution piping is 40 feet of equivalent run. The number of piping elbows in the installation should be minimized (see Pages 7 and 8 for more information.)
The unit should have ready access to electrical service, a supply of ordinary tap water, and a sewer into which the drain line can discharge hot waste water. (Figure 5-1)
NOTE: Please contact factory for duct applications offering high static pressure (>4" WC).
5
Model unit
701 703
704
Water
60 Ibs. + 20 Ibs. = 83 Ibs. + 30 Ibs. =
95 Ibs. + 60 Ibs. =
Total
80 Ibs. 113 Ibs.
155 Ibs.
Figure 5-1
INSTALLATION
4) MOUNTING THE HUMIDIFIER MODEL EHU-701: Making sure the unit is level, hold it against the mounting surface and mark
the hole pattern. Attach the units to studs or other sturdy structure with the two 3/8"× 1½" lag screws provided.
MODELS EHU-703 & 704: Making sure the mounting bracket is level, attach it to studs or other
sturdy structure with the two 3/8"× 1½" lag screws provided. Hang the humidifier on the mounting bracket.
5) ELECTRICAL SERVICE WIRING
Refer to the nameplate on the unit for recommended fuse size. Table 6-1 relates the fuse size to the appropriate branch size. A complete wiring diagram shown in Figure 12-1 is located inside the door of the humidifier.
IMPORTANT: Please observe the following:
a. Make certain there is a manually operated interlocking circuit breaker or safety switch (not
furnished) in the electric service ACCESSIBLE TO AND WITHIN SIGHT OF THE HUMIDIFIER.
b. USE ONLY WIRE WITH COPPER CONDUCTORS RATED 90°C OR HIGHER
FOR HIGH VOLTAGE AND GROUNDING.
c. Pass high voltage ground lead through provided ferrite core (AN) between where it enters
the cabinet and where it connects to ground lug.
d. Ground the humidifier cabinet; a ground lug is provided in the wiring compartment.
6
Table 6-1. Series EHU-700 Capacities and Electrical Ratings
Nom
Recommended Output Per Hour @ Voltage Shown
Amp
Current Branch Circuit Single Phase Three Phase
Rating
Module
Wire
Circuit 120 208 240 277 208 240 346
1
380 415
2
480 600
Breaker lb kg lb kg 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 17 7.7 21 9.5 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 29 13.2 36 16.3 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 34 15.4 42 19 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 38 17.2 — — 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 48 21.8 60 27.2 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 58 26.3 72 32.7 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 77 34.9 96 43.5 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 96 43.5 120 54.4 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 45.4 115 52.2 — —
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 96 43.5 120 54.4 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 45.4 115 52.2 144 65.3 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 60.3 154 69.8 192 87.1 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 75.3 192 87.1 240 108.8 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 90.2 230 104.3 — —
NOTES:1346 Volt units require 346/200 volt 4-wire system.
2
415 volt require 415/240 volt 4-wire system.
KW rating = humidiity output (lbs/hr) x 0.345 (for energy calculations only; not for branch circuit sizing).
6) WATER FILL SUPPLY
Connect the unit to the building water supply (25 to 125 psig pressure). Install a shut-off valve near the humidifier. Connect the water supply to the 3/8" tube compression fitting on the fill valve adaptor.
NOTE: ORDINARY (POTABLE) TAP WATER IS RECOMMENDED. IF POTABLE WATER IS NOT
AVAILABLE, CONSULT THE FACTORY (SEE "WATER QUALITY AND TREATMENT SECTION OF THIS MANUAL, PAGE 23, FOR MORE INFORMATION). DO NOT USE BRACKISH OR CONTAMI­NATED WATER.
7) CONNECT DRAIN
Connect to a suitable waste draining system. Use the clear drain hose provided and a 1" copper pipe (Figure 7-1), pitched 1"per foot. The drain water may be as hot as 160°F. Drain it where it will not present a hazard to personnel. An air gap to prevent backflow is required if drain water is required to be less than 140°F, use of Temp-R-Drain will be required.
8) INSTALL THE STEAM
DISPERSION TUBE NOTE: Please
contact factory for duct applications offering high static pressures (>4"WC).
a. Verify that the proper length and type of
steam dispersion tube has been selected: See Chart 7-1 for proper dispersion tube lengths. The low capacity dispersion tube (Figure 7-2) is sloped toward the generator to allow for gravity drainage. On applications where the humidifier output capacity is greater than 40 Ibs/hr, a high capacity tube with a ½"O.D. drain tube must be used (Figure 7-3). Drain tube must have minimum 6" water seal (see Fig. 8-3).
b. Select a location on the duct that provides
adequate length for vapor mixing and the shortest connection length for vapor mixing and the shortest connection length to the humidifier. Preferably the location should be 6" downstream and/or 10 feet upstream from any dampers, vanes, bends in the duct, or controllers (i.e. high limit stat). See page 10 for details. Do not install the dispersion tube into ducts in which airflow exceeds 2,000 fpm. Do not restrict airflow in ducts with a depth of 8 inches or less. Avoid placing manifold in downward, high velocity air flow as dynamic air pressure will restrict steam flow.
7
Copper Pipe
40 lb/hr or Less
6
6
Figure 7-1
Chart 7-1. Selecting Proper Steam Dispersion Tube
Steam
Steam Disp. Duct Width
Weight
Disp. Tube Tube Length Min. Max. Model No.
in mm in mm in mm lb kg
D-1 12 304 11 279 16 406 3 1.4
D-1.5 18 457 17 432 22 559 3 1.4
D-2 24 609 23 584 34 864 4 2 D-3 36 914 35 889 46 1168 6 3 D-4 48 1219 47 1194 58 1473 8 3.6 D-5 60 1524 59 1499 70 1778 9 4 D-6 72 1829 71 1803 82 2083 10 4.5 D-7 84 2133 83 2108 94 2388 11 5 D-8 96 2438 95 2413 106 2693 12 5.5 D-9 108 2743 107 2718 118 2998 13 6
D-10 120 3048 119 3023 130 3302 14 6.4
Figure 7-2
Figure 7-3
1" I.D. Clear Hose Supplied with Unit
Fit Hose Inside 1-1/2" Pipe
1" or Larger
.00
6.00
5.25
Ø.22
4 Places
5.25
Ø1.75
Hole in Duct
For Steam Capacity
L
.00
3.50
1.00
6.00
5.25
R.88
R.37
Ø.22
4 Places
5.25
3.50
Hole in Duct
For Steam Capacity
Above 40 lb/hr
2.00
1.50
L
c. Use the template provided to cut installation
holes in the duct for the dispersion tube as in Figure 7-2 (and optional drain tube, Figure 7-3).
d. Insert the dispersion tube into the duct so
the holes face upward. Fasten the mounting plate to the outside of the duct with sheet metal screws. If the dispersion tube is 36" long or more, support the far end with threaded rod or similar means.
e. Connect the dispersion tube to the steam generator using 1¼" (EHU-701) or 1½" (EHU-703,704)
nom. size hard copper tube (customer supplied) and the two short hoses supplied with the humidifier (Figure 8-1). Pipe size may need to be increased to 1½" or 2" when piping runs are long or back pressure in duct is high, see Figure 9-2. If piping plus duct back pressure exceeds 4" WC, please consult factory. In addition, a short length of nominal
1½" threaded black iron pipe
and a copper tube to female pipe thread adaptor must be supplied by the customer for attaching the piping to 703 or 704 tanks (Figure 8-2).
A 1½" to 1¼" reducer will be required
to connect the dispersion tube to the steam pipe of Models EHU-703/704 (Figure 8-5).
The steam pipe must be free of kinks and sags to allow for gravity drainage of condensate. (Provide pitch of 1" per foot towards the unit.) Pipe supports may be required to accomplish this. Insulate the copper tube to minimize condensation.
The preferred installation of the dispersion tube is above the humidifier with a maximum piping run of 20 feet or less (Figure 8-3).
Figure 8-4 shows the correct installation when:
1) You cannot achieve a 1" per foot reverse slope of the piping.
2) Piping runs range from 20 to the maximum of 40 feet of equivalent run.
3) Elbows or vertical risers must be placed in the piping.
4) The steam dispersion tube MUST BE
below the humidifier. For this installation use a 1¼" copper tee for the drain connection of an EHU-701 or a 1½" copper tee for EHU-703 or 704 (Figure 8-5).
8
er
S
EHU-701
n d
1-1/2" to 1-1/4" Copper R
p
Figure 8-1. EHU 701
Figure 8-2. EHU 703/704
Figure 8-3
Figure 8-4
Figure 8-5
1-1/4" Copper Tube
1-1/2" I.D. Hose
EHU-701 Steam Generator To
1-1/2" Copper Tube
Copper Tube Female Pipe Adapt
1-1/2" Pipe
Hose Clamp
2" I.D. Hose
team
Outlet
Duct Above Outlet
6" Water Seal
Holes in dispersio tube to be installe in "UP" position
Floor
Drain
educer if Needed
1-1/2" I.D. Hose
1/2" PVC Tubing
1/2" O.D. Copper T ubing
CONTROL WIRING
NOTE: Wiring to the low-voltage controls should not run in the same conduits as the power supply
wiring because faulty signals could result. The use of either a metal conduit or shielded wire is required for all the control and / or safety wiring. When using metal conduit, the conduit must extend the entire length of the wire, and the conduit must be grounded at the humidifier cabinet. If the conduit does not extend the entire length of the control wire, the wiring must be shielded and the following guidelines must be used:
1. The wire shields and all unused conductors must be grounded externally to the humidifier cabinet.
2. Ensure a good connection between the shields / conductors and the metal bar of the humidifier cabinet.
Additionally, a supplied ferrite core must be installed around the control wiring between where the wire enters the humidifier cabinet and the low voltage terminal block.
9) CONTROL HUMIDISTAT
The Series EHU-700 is capable of accepting controls signals with the following characteristics:
a. 0-10 Vdc Humidistat
(Part No. A18609 and A18610) (H200 or H270 series)
b. 1.9-3.9 Vdc Humidistat
(Part No. C1471 or C1472)
c. 4-20mA, 250 Ω input impedance.
d. 0-10 Vdc, 50 kΩ input impedance.
e. 0-5 Vdc.
f. 0-135 ohms.
g. on/off
To adapt the EHU-700 to these different types of control humidistats, jumper BJ4 and BJ5 on the print­ed circuit board (Figure 9-1) must be manually changed and the humidistat must be wired to the appropriate connections of terminals 1, 2 & 17. Refer to Figure 9-1 or the sticker on the inside of the cabinet for proper jumper locations.
9
(
Pressure Loss in Copper Pipe
0
I
Figure 9-1
Figure 9-2
Chart 9-1
3"
(75 mm)
5-1/2"
140 mm)
5
4
3
n. WC
2 1
10
(40' Equivalent Run)
20
30
40
50
#/Hr. Steam
60
1-1/4"
70
1-1/2"
2"
90
100
110
12
80
Feet of equivalent copper pipe for copper pipe fittings
Fitting 1-1/4 1-1/2 2 45° Elbow 1.0 2.2 2.8 90° Elbow 2.5 4.3 5.5 90° Long Elbow 1.5 2.7 3.5 Tee 5.0 9 12
Wall Mounted Control Humidistat:
Wall-mounted humidistats are usually installed 4 ft. to 5 ft. above floor level. Often, the best location is beside a thermostat that controls temperature in the same space that is to be humidified, if that loca­tion meets the following criteria:
• The control humidistat should be located where it will be exposed to the average air condition of the space to be humidified.
• Avoid areas of restricted air circulation, or locations where the sensor will be subjected to air drafts, localized heat, or moisture sources.
• Locations near coffee machines, computer blower outlets, doors to other rooms, or windows that can be opened are not suitable.
10
e
C
ir
Figure 10-1
Modulating
High Limit
Sensor
Safety
High Limit
Humidistat
(optional)
6 - 10 Ft.
Air Flow Switch
Outdoor Temperatur Sensor
Outside A
Humidifier Location
Humidifier
onnections
Main Humidity Sensor
Duct Mounted Control Humidistat:
Duct-mounted control humidistats are also available for installation where sensing and control of return air or exhaust air ducts is preferable. (Figure 10-1)
Please refer to manufacturer's recommendations for further information on the location, mounting, and operation of the various control humidistats.
10) HIGH LIMIT DUCT HUMIDISTAT
Remove the jumpers tab from terminals 10 & 14 and wire the high limit stat between these terminals. Refer to Figure 10-1 and Figure 11-1 (the overall wiring diagram) for more information. A duct mounted high limit humidistat is recommended to prevent over-saturation of the duct air. Use an on-off controller that opens on fault (high humidity). Humidistat should be set for a maximum of 90% RH. Alternately, a modulation high limit humidistat may be used on applications such as variable air volume (VAV). Locate the high limit humidistat approximately 10' (3m) downstream of the dispersion manifold. If 10' (3m) is not available, consult the factory.
11) AIRFLOW SWITCH
An airflow switch is recommended to deactivate the humidifier when there is insufficient air flow in a duct system. A duct pressure switch is preferred as an airflow sensor. The pressure switch should open on insufficient airflow (opens on fault). Airflow switch should be mounted in supply air duct upstream of humidifier dispersion. Remove the jumper tabs between terminals 9 & 15 and wire the airflow sensor between these terminals. See Figure 11-1 and Figure 12-1 (the overall wiring diagram) for more information. Complete installation and wiring instructions are contained in the duct pressure switch package.
NOTE: LIMIT SWITCHES (HIGH LIMIT AND AIRFLOW SWITCHES) OPEN ON FAULT.
11
V
V
On-Off Humidistat
Figure 11-1
1.9 - 3.9 Vdc
oltage Source
17
Ground
Set BJ4 Stat Input Selector to 1.9 - 3.9 Vdc
2
Stat In
1
N/C
20
Set BJ5 Voltage Source to 12 Vac
Black White
Green
Part No.
C1471
or
C1472
Voltage Source
4-20 mA & 0-10 Vdc Setting*
oltage Source
*See Figure 10-1 for Armstrong 0-10 Vdc Humidistat Connections
17
Ground
2
Stat In
1
N/C
20
Set BJ4 Stat Input Selector to
0-10 Vdc or 4-20 mA
­+
Voltage Source
Switch Opens on RH Rise
17
Ground
2
Stat In
1
N/C
20
Set BJ4 Stat Input Selector to On/Off
Set BJ5 Voltage Source to +5 Vdc
Brown
Orange
Part No.
A8581
or
A8581A
0-135 Ω Ohm Potentiometer
Part No.
17
Ground
2
Stat In
1
N/C
20
Set BJ4 Stat Input Selector to 0-135 Ohm
Set BJ5 Voltage Source to +5 Vdc
A6707A
or
A18611
Humidity
Increase
12) AUDIBLE ALARM
There is an external alarm circuit provided. When an alarm condition is detected in the diagnostic routines, a relay contact closes allowing activation of an external Class II device connected between terminals 27 & 28. This circuit is rated to 1 amp.
12
Figure 12-1
Low-Voltage Low-Energy
Controls
Main Control Humidistat
High Limit* Humidistat
Air Flow* Switch
N.O. Alarm Relay
*Must be closed to run
24 VAC
Fill Valve
24 VAC
Drain Valve A
Panel Switches
Tank
Drain
On/Off
On/Off
Micro Controller
Printed Circuit
Board
LED
Display
Mode
Select
Three-Digit
Numerical Display
High Water
Switch A
Current
Transformer
24 VAC
Contactor
Steam
Generator A
Side 1
24 V Secondary
Power Transformer
Side 2
High Voltage
Terminals
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