AutoFlo S2020 Humidifier User Manual

Installation
Instructions &
Owner's Manual
C
UL
R
US
This symbol on
the product means
the product is
listed by
Underwriters
Laboratories, Inc.
ELECTRONIC STEAM UNIT - POWER HUMIDIFIER
MODELS S2000 AND S2020
FOR GAS OR OIL FORCED AIR FURNACES, HEAT PUMPS AND ELECTRIC FURNACES
The AutoFlo Residential Power Humidifier you have purchased
has been designed to be simple to Install, Operate and Maintain.
Read this manual before you install the Humidifier.
Familiarizing yourself with the items listed in Figures 1
and 2 will assist you in installing and maintaining your
Steam Power Humidifier.
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WATER LEVEL
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TEMPERATURE PROBE
FIG. 1
Parts included in the Steam Humidifier package are:
1. Self Piercing Saddle Valve
2. Installation Instructions and Owners Manual
3. Mounting Templates x2
4. Installation Hardware package
5. Insulation and tape
6. Automatic Drain Assembly
7. Humidistat - Autoflo Models 062000 or 072000
8. 1/2” I.D. Drain Hose-8 FT.
9. Anode #Z 100
Options and additional parts recommended:
1. Water Hammer Arrester #WH 100
2. Anode #Z 100
3. Decorative under duct cover # Sc100
4. Gasket Material to seal flanges (field provided)
P/N 094021A0099 Rev. J
Copyright C 1999-2003 EWC Controls All Rights Reserved.
SIMPLIFIED INSTALLATION INSTRUCTIONS
DETAILED INSTALLATION INSTRP4.56603
I3
IION
0.000010000
A temperature sensor is mounted in the water reservoir of the
humidifier. As the water temperature increases to about 170
degrees F, the computer closes a set of blower relay contacts.
When the water cools to about 140 degrees F, the computer
will open the relay contacts.
6. WATER SUPPLY - Required Criteria
A. WATER SUPPLY USING THE SADDLE VALVE
FURNISHED WITH UNIT
Installation instructions for the saddle valve are printed on
the plastic bag containing the saddle valve and its
components. Tap into a 1/2” or 3/4” domestic hot water
line for best results, but a cold water line will do. Avoid
connecting to water lines from a Reverse Osmosis system.
The supply water must read a minimum of 25 ppm in
order for the Steam unit to reliably sense the water.
9. WIRING THE STEAM HUMIDIFIER
IMPORTANT: Dedicated fused circuits of the proper
voltage and current ratings must be provided. All
wiring must conform to local and national codes.
A. INSTALLINGAND WIRING THE HUMIDISTAT
A humidistat, such as the AutoFlo Models 062000 or
072000 is required to control the Steam Humidifier. The
humidistat may be installed on the wall in the living space
or on the return air duct. NOTE: Continuos fan operation
should be initiated if the humidistat is installed on the
return air duct! Instructions for installation are packaged
with the humidistat.
DO NOT connect any foreign voltage to the “H” terminals
of the humidifier. The unit supplies it’s own 24 volt
control voltage. Simply connect the two “H” terminals
straight to the humidistat terminals.
NOTE: Never install the saddle valve on the bottom of the
water pipe. Sediment in the water pipe may clog the
saddle valve. When tightening the hex compression nut,
tighten only enough to assure there are no leaks.
NOTE: Saddle valves do not meet plumbing codes in
some areas. A “T” fitting with a valve may be required to
meet code or, if low water pressure causes frequent water
alerts on the steam humidifier.
NOTE: Do not use any line which is served by a water
softener. If your home has a water softener, make the
water connections to a water line upstream from the water
softener. A water softener is not a demineralizer. It merely
exchanges various hard ions for soft ions in the water.
These soft ions, or minerals, will build up in the
humidifier, causing the need for frequent servicing. The
evaporation of softened water may also produce a white
powder which may be carried into the duct system and,
ultimately, into your home.
S2000 & S2020 Typical Wiring
and Blower Interlock Diagram
S2000 & S2020 Humidifier
Note: Use a water hammer arrester (WH-100)
Typical
Thermostat
if water spikes occur during operation.
B. OVERFLOW & DRAIN LINES - Required Criteria
The use of an overflow line and drain line is always
required.
Use the supplied 1/2” ID high temperature hose. Slip the
hose over the 1/2” OD “T” drain fitting and use a hose
clamp to secure. Route the hose to a suitable drain,
avoiding kinks, traps and sharp objects.
DO NOT route the hose above the humidifier.
Y
R W G
Y
G1 R G2 H
Furnace
NOTE: Previous models required two [2] drain hoses.
The new models include an integrated overflow tube with
a high temperature barbed “T” fitting. The new design
simplifies the installation process.
Failure to install all necessary drain lines will result in
water leaks during normal operating conditions, and
voids all warranties.
FIG. 5
H
Humidistat
Heat & Cool System
B. FIELD WIRING
All wiring must be made in accordance with local
codes and ordinances. DO NOT cut off the
grounded plug and/or hard wire this unit to line
voltage. Do not use extension cords to
7. MOUNTING THE STEAM HUMIDIFIER
Use gaskets to seal where the steam flanges contacts the
ductwork. Place the humidifier reservoir into the opening in
the duct and secure with eight (8) sheet metal screws.
NOTE: If the ductwork will not support the unit in a level
position with the water pan full of water, the duct-work
must be reinforced. Both steam models weigh
approximately 9 Lbs. empty and approximately 15 Lbs.
full of water.
operate this unit!
Figures 5 & 6 describes the suggested interlock
wiring arrangement for HVAC systems. Interlocking
may be performed on heating systems that provide a
24 VAC NEC Class 2 terminal for blower control.
IMPORTANT NOTE:
8. STEAM OPERATION
Because of the high output of this Humidifier, it must not
be operated in ducts or plenums without the blower
operating. The steam humidifier is designed to be
"Dominant" over the Heating-Air Conditioning System
Blower. The "System" Blower will be operated by the
humidifier, when humidity is required to meet the
demand. A minimum of 800 cfm is required for proper
operation of the steam humidifier. Lower velocities will
result in excessive condensation inside the duct.
R W G
If the Steam Humidifier is removed and
disconnected from the system, the
blower interlock circuit must be
restored to it's original configuration.
Failure to do so may result in loss of
blower operation!
3
10. SETTING THE HUMIDISTAT
S2000 & S2020 Humidifier
Heat only
Thermostat
R W
G1 R G2 H
It is recommended that humidistat settings of 30-40% not be
exceeded. If condensation is noticed on windows during
very cold outside temperatures, the humidistat setting should
be lowered.
H
The maximum recommended relative humidity for your
home depends upon factors such as outdoor air temperature,
type and placement of insulation, vapor barriers,
effectiveness of weather stripping, type of windows and
doors (including frames and jambs) and whether or not storm
windows and doors are used. With all these variables it is
nearly impossible to recommend a proper humidity setting.
The best humidistat setting is one that you are comfortable
with. Also, as the outdoor temperature fluctuates, it may be
necessary to adjust the humidity level of your system a few
times during the heating season.
R W G
Furnace
FIG. 6
Humidistat
Heat Only System
Refer to the "Relative Humidity Chart" as a starting point for
your proper humidistat setting. Generally, in a tighter and
better insulated house, the humidistat may be set higher than
in a drafty, un-insulated house.
Connect field wiring as shown in Figures 5 or 6.
IMPORTANT: If the humidifier is installed in the return air
plenum the humidistat must be located at least three (3) feet
upstream from the humidifier. Fan should be operated in
continuos mode when humidistat is mounted in the return air
plenum.
The humidistat has two (2) screw terminals which should be
connected to the low-voltage interlock plug. (Figure 5).
Wiring instructions for the 072000 model Humidistat are
packaged with the 072000.
RELATIVE HUMIDITY CHART
Outside
Relative
Humidity
Indoor Relative
Humidity
When Outside
Air Is Heated To
72 Degrees F
-10 Deg. F
40%
60%
80%
1%
2%
2%
20%
0 Deg. F
40%
60%
80%
2%
2%
5%
25%
10 Deg. F
40%
60%
80%
4%
5%
7%
30%
20 Deg. F
40%
60%
80%
6%
8%
11%
35%
30 Deg. F
40%
60%
80%
8%
13%
17%
40%
Outside
Temperature
4
Maximum Safe
Recommended Indoor
Relative Humidity
11. INITIAL START-UP - SEQUENCE OF OPERATION and SERVICE “LED” INDICATORS
Once the Steam Humidifier has been installed and the
water, humidistat and blower interlock connections
completed, the humidifier may be initially started.
D. BLOWER: When the water in the reservoir reaches
approximately 170 deg. F. the "BLOWER" LED will
be illuminated and the interlock wiring should turn the
system blower on. Depending upon the water and
ambient temperatures, it may take anywhere from four
to twelve minutes for the water to heat to 170 deg. F. If
the humidistat remains closed the "HEATER" and
"BLOWER" LED's will both be illuminated at the same
time and the "POWER" LED will be blinking slowly.
A. Flush and Turn "ON" the water supply to the steam
Humidifier.
B. Set the humidistat to a high or "ON" position.
C. Plug the S2000 Humidifier line cord into a 120
VAC, 15 amp source. (240VAC,10amp for S2020).
E. The "FILL" LED will illuminate and the water
reservoir will refill at irregular intervals, depending on
the boil off rate. Depending upon
the water
temperature, the "BLOWER" LED may remain
illuminated or may go off when the reservoir is filling.
The "HEATER" LED should remain illuminated
unless the humidistat opens or the humidifier enters a
drain cycle or failure mode.
D. The Green "POWER" LED should blink rapidly
and the drain valve will open momentarily upon initial
start up. The "FILL" LED will illuminate and water
should begin to fill the Water Pan.
E. When the water has reached the probe level the
"FILL" lamp and fill valve will be turned off, and the
"HEATER" LED and heater element will be turned
on. The “POWER” LED will blink slow and steady.
F. DRAIN: This LED will be illuminated when the
microprocessor cycles the humidifier into a
Maintenance Mode. After a fan forced cool down
period, the water is allowed to drain at 140 degrees F.
The drain valve will then close and the fill valve will
open to refill the reservoir and resume normal operation
This mode will last about one hour and the
microprocessor will automatically restart the unit
afterwards, if there is a call for humidity. This drain
cycle will occur once every 8-12hours, to reduce the
mineral concentration in the tank and let the heater cooldown. That will shed most deposits that have built up
on the heater. NOTE: The "POWER" LED will blink
rapidly during Maintenance mode.
NOTE: A unique feature of the “S” series humidifiers
is called “Fill on Request”. The unit will not refill with
water after a maintenance cycle, unless there is a
demand for humidity from the humidistat. This
ensures that the unit will not sit idle with standing
water, which can stagnate over time.
F. Once the water reaches 170 deg. F. the "BLOWER"
LED will illuminate and the system blower should start
up.
G. If the above steps have been successfully completed,
the humidifier is operating properly.
12. OPERATING SEQUENCE
A. POWER: In normal standby mode, when the
humidistat is not calling for humidity and the power
cord is plugged in, the "POWER" LED should be
blinking slowly. If the green "POWER" LED is not
flashing, when there is power to the unit, there has been
a malfunction in the microprocessor circuit.
G. FAILURE LED'S: When service is required,
these LED's will illuminate. If the humidifier enters a
failure mode, it must be manually reset by
disconnecting the power and then reconnecting it.
B. FILL: When the humidistat closes, on a call for
humidity, the "FILL" LED is illuminated, the Solenoid
Valve is open and the water reservoir is filling.
WATER: This will occur when the reservoir is not
filling up with water, not filling fast enough or the
microprocessor cannot recognize that the water is
touching the probe. Reverse Osmosis water or purified
(distilled/deionized) water sources should be avoided,
unless the final feed water measures at least 25 ppm
conductivity.
C. HEATER: When the water reaches it's proper level
the valve closes, the "FILL" LED goes out, the
"HEATER" LED is illuminated, and the Heater begins
to heat the water.
NOTE: If the humidifier is unplugged while in
operation and then plugged back in, A rapid
flashing of the “POWER” LED will occur and all
other functions will stop! The unit wants to
perform a water probe test, but cannot perform
this test until the water cools down. Simply wait
until the unit cools down and it will resume
normal operations.
HEATER: This will occur if the humidifier is not
boiling off water during the "HEATER" cycle. Water
in the reservoir is not reaching 170 deg. F. temperature,
or the unit has not detected a request for water in a 45
minute steaming time period. Both red LED’s will
illuminate in this condition.
THERMISTOR: This will occur if a short or open is
detected in the temperature probe.
5
13. MAINTENANCE/SPRING SHUTDOWN
K. Rinse out the reservoir. Be careful to keep water off of the
wiring compartment or the outside of the humidifier.
Allow the unit to dry thoroughly before using!
Proper maintenance and removal of mineral deposits is still
required on your steam humidifier in order to optimize
performance. Annual cleaning is a must and more frequent
cleaning may be necessary depending on the mineral content
of the water in your area.
A post winter cleaning and shutdown, will prevent hard
deposits from accumulating inside the bin, while the
humidifier is idle over the summer. Do not allow the unit to sit
idle for long periods without a proper draining, cleaning, and
shutdown. Failure to do so, will affect the performance of your
steam humidifier.
Maintenance and inspection of the unit requires removal of
the humidifier from the duct. This can be done following
these steps.
L. Reinstall the tank baffle and tighten the two (2) screws.
M. Re-install the unit in the duct and connect the water line, the
drain lines and the cable plug. Store the unit in this condition
for the summer, or continue to the next step.
N. Turn on the water supply. Inspect the water connections and
drain fittings for leaks.
O. Plug-in the S2000 power cord to the 120 VAC (240 VAC for
S2020) grounded outlet. DO NOT use an extension cord.
a. The green POWER light should blink slowly.
A. Unplug the power cord from the 120 volt source for
S2000 (240 volt for S2020) and allow the water to cool for
at least 30 minutes prior to removal.
b. If the humidistat is calling for humidity the water
valve will energize and the water pan will begin
to fill.
B. Turn off the water supply at the saddle tapping valve.
14. SERVICE INDICATORS
C. Remove the cable assembly wire plug from the top of the
plastic control housing.
Seven LED lamps provided on the front panel indicate the
functional status of the humidifier as shown in Figure 7 below.
D. Drain the water with the manual drain valve. NOTE: The
drain valve will be hot if the humidifier has not been
allowed to cool.
E. Disconnect the water and drain lines. NOTE: Some water
may drain out of the water line. Have a small container
ready to catch the water.
NOTE: Although the water has been drained, some water
may still remain in the humidifier reservoir along with
sediment. Be careful not to tip the unit over when
removing it from the duct.
Remove the eight (8) screws from the front mounting
plate.
F. Slide the humidifier out of the duct.
G. Remove the two (2) screws holding the tank baffle to the
pan flange and remove the baffle from the unit. Scrape all
mineral deposits from the baffle and wash baffle off as
described in step J. Remove the Anode from the baffle
plate and purchase a new one. Operating the unit without
the Anode will degrade the performance and increase
maintenance.
LED LIGHT EXPLANATION
H. Use a putty knife to scrape the minerals from the sides and
bottom of the water reservoir. DO NOT scrape on the
small temperature probe, or the heater element. Use a soft
emory cloth or brass brush.
POWER
- GREEN - BLINKING SLOWLY-IF POWER TO UNIT
SERVICE THERMISTOR - RED
SERVICE HEATER
-RED
SERVICE WATER
- RED
I. Carefully scrape the Water Level Probe to remove
mineral deposits. Use soft emory cloth if necessary.
J. Clean the Water Probe Insulator, inside the pan, with a
cloth and 50-50 mixture of water and vinegar, rinse with
fresh water. Inspect for any mineral deposits on the plastic
insulator. Repeat cleaning if necessary and thoroughly
dry. Use a small brass brush to clean deposits off the
heater element and thermistor probe. Be careful not to
damage any of the components.
- ON STEADY
- ON STEADY BOTH LED'S
- ON STEADY
BLOWER
- AMBER - ON STEADY WHILE PAN ABOVE 170 DEG F.
HEATER
- AMBER - ON STEADY WHILE HEATING (BOILING)
FILL
- AMBER - ON STEADY WHILE FILLING PAN
DRAIN
- AMBER - ON STEADY WHILE DRAINING PAN
IMPORTANT NOTE
ON THE INITIAL FILL AFTER INSTALLATION OR ANY TIME THE WATER PAN IS DRAINED THE PAN
MUST FILL WITH ABOUT THREE (3) TIMES THE AMOUNT OF WATER AS REQUIRED IN THE NORMAL
CYCLE OF FILLING. THE 'FILL TIMER' MAY TIME OUT BEFORE THE WATER LEVEL REACHES THE
WATER LEVEL PROBE CAUSING THE 'SERVICE CYCLE' TO BE STARTED. IF THE WATER FAILURE
ILLUMINATES, UNPLUG THE UNIT FROM ITS POWER SOURCE, WAIT ABOUT 15 SECONDS AND
RECONNECT THE POWER SOURCE. THE SERVICE LIGHT WILL GO OUT AND THE UNIT WILL
CONTINUE FILLING TO THE CORRECT LEVEL.
FIG. 7
6
SERVICE INDICATORS
5.The water valve may be defective and must be replaced
See replacement parts.
A. The green "Power" light does not blink off and on.
1. The S2000 is not connected to an active 120
VAC 15 Amp power source. (S2020, 240 VAC,
10 AMP).
6. The drain valve is unplugged or defective.
7. Debris is clogging the drain valve or drain line.
2. Call the Technical Support Hotline.
8. Reset the unit by unplugging the power cord and reconnecting.
B. The "HEATER" LED does not illuminate.
G.
1. The humidistat is not closed, calling for humidity or the
humidistat is wired incorrectly.
2. The unit is in the maintenance cycle.
Both Red Service Lights (error #3) are on.
HEATER FAILURE...This is an indication that the water
temperature is not increasing or reaching the boiling
point.
1. Faulty heater element or faulty wire connection.
C. The HVAC Blower will not operate, but the "Blower"
LED is on.
2. This can happen if the unit is operated without water
in the pan as a result of a water level probe malfunction,
due to lack of maintenance. The pan boils dry and overheats the water pan. If this condition occurs, call the
Technical Support Hotline.
1. The blower "Field" wiring and/or interlock circuitry is
incorrect.
2. The HVAC electric power is disconnected.
3. The unit has operated for 45 minutes without a request
for water, due to a leaking water fill valve, which is filling
the tank continuously.
3.The humidifier internal "Blower" relay is defective. Call
the Technical Support Hotline.
4. The HVAC Blower motor has failed.
If the humidifier seems to operate in a random manner
that doesn't seem to fit any of the pre-described
conditions, check the following:
D. The HVAC Blower will not operate and the "Blower"
LED is not on.
H.
1. The water pan temperature has not reached a high enough
temperature to activate the "Blower" relay, about 170
degrees Fahrenheit. This takes several minutes after the
"HEATER" LED is illuminated. Depending on the water
temperature and the surrounding condition, this may take
up to 12 minutes. If the problem continues, the heater
element may be defective, the thermistor temperature probe
may be defective. Contact the Technical Support Hotline.
1. Check to make sure that the wires used to connect the
humidifier to the humidistat are separate wires and not
part of a multi-wire bundle used to hook up the furnace
thermostat or any other device. The associated close
wires may create an induced voltage in the humidistat
wiring.
2. Make sure that the water level probe and plastic
insulator are clean and free of mineral build-up. It may
become electrically conductive to ground, sensing a false
indication that the water level is correct.
E. Red Service Light (error #1) is on constantly.
THERMISTOR ...This is an indication that the temperature
probe is open or shorted to ground. May also indicate the
probe has detected a pan temperature below 32 degrees F.
Or in excess of 230 degrees F., resulting in a total shutdown.
Try to reset the unit by unplugging the cord and
reconnecting, or call Technical Support.
3. If the electric solenoid valve makes a loud noise when it
closes, install an optional water hammer arrester to absorb
the spike. Frequent or erratic water fill cycles can be due
to air turbulence, when mounted in the supply air plenum.
4. The water probe uses the natural conductivity of the
water, to determine the proper water level in the reservoir.
Water that has been de-mineralized or over treated may
not allow the unit to function properly. Minimum 25 ppm
of total dissolved solids must be present in the water.
Add approximately 1 tablespoon of salt to the tank, to
temporarily remedy this problem.
F.
Red Service Light (error #2) is on constantly.
WATER ...This is an indication that the water fill time has
been exceeded. The water level did not reach the probe tip
in the given amount of time. It may also indicate an
unsuccessful drain cycle.
1. The water line is shut off at the saddle valve.
2. The water line is crimped or pinched.
3.The water valve inlet screen is plugged. Remove the
water line from the unit and check the screen found inside
the inlet side of the valve.
4.Unit is connected to a water source which is distilled,
over-filtered, de-mineralized, or from a reverse osmosis
system. Minimum 25 ppm water conductivity is
required. *The unit supply water must contain dissolved
solids in the water, or the processor will not be able to
detect the water level.
5. These steam humidifiers must be connected to
dedicated outlets of the proper current and voltage ratings.
The use of extension cords is not recommended.
DO NOT cut off the grounded plug and/or
hard wire this humidifier to line voltage.
This will void the warranty.
7
ITEM
S2000
PART NO.
1
2120
1
15. SERVICE AND REPLACEMENT PARTS
S2020
PART NO.
DESCRIPTION OF PART
120 VOLT HEATER ASSEMBLY
2240
240 VOLT HEATER ASSEMBLY
2
2001
2001
24 VOLT SOLENOID VALVE ASSEMBLY
3
2002
2002
THERMISTOR PROBE ASSEMBLY
4
2003
2003
WATER LEVEL PROBE ASSEMBLY
5
2004
2005
CIRCUIT BOARD ASSEMBLY
6
2006
2006
DRAIN VALVE ASSEMBLY
7
2007
2007
TANK BAFFLE
8
2008
2008
INSULATION KIT (not shown)
9
WH 100
WH 100
10
Z 100
Z 100
ANODE
11
2009
2009
UNDER DUCT STEAM COVER (not shown)
WATER HAMMER ARRESTER (not shown)
Ewc
CONTROLS INC.
385 Highway 33
www.ewccontrols.com
Englishtown, NJ 07726
e-mail: autoflo@ewccontrols.com
Tel. (800) 446-3110
Fax: (732) 635-8646
8
OVERFLOW TUBE,
.50 ID x 6" LG.
P/N 094021A0074
FIG. 8
SOLENOID VALVE, 24/60 VAC
P/N 094021A0040
BARBED TEE,
1/4-18 NPT TO 1/2"
P/N 094021A0073
BLACK WIRES
18GA. X 18" LONG
P/N 501052A0002
DRAIN COCK VALVE
P/N 094020A0055
JUMPER WIRE,
20GA. X 1.50" LONG
"T" ADAPTER, 1/4" NPT
P/N 094021A0038
MOLEX PLUG
P/N 205113A0098
EWC
CONTROLS INC.
385 Highway 33
www.ewccontrols.com
Tel. (800) 446-3110
Englishtown, NJ 07726
e-mail: autoflo@ewccontrols.com
Fax: (732) 635-8646
9
Tech. (800) 526-4048
APPLICATION NOTE
AN 131
AUTOFLO HUMIDIFIER
Z100 ASSEMBLY
INSTALLATION INSTRUCTIONS & OWNER'S MANUAL
Z100 REPLACEMENT INSTRUCTIONS
SUPPLEMENT TO THE AUTOFLO ELECTRONIC STEAM POWER HUMIDIFIERS
MODEL # S2000 AND S2020
The AUTOFLO steam humidifier now comes equipped with a factory installed Z100, which acts as a
sacrificial metal. Put simply, minerals in the water will attack and cling to the Z100. The minerals
will not attack the other components inside the humidifier as long as the Z100 is present and active.
This results in a dramatic decrease in mineral and scale build up on the critical components
inside the tank. In particular, it means less scale build up on the heating element which is subject to
damage from excessive scaling and over heating. This also means that efficiency stays high and
preventive maintenance is faster and easier.
The Z100 is positioned on the baffle plate inside the tank and is easily removed and replaced.
Remember that the Z100’s job is to become the target of mineral attack, so it will be heavily covered
with scale and should be replaced annually for best results.
To remove the Z100 you must have already unplugged and shutdown your steam humidifier and
allowed it to cool. The water tank has been drained, the water supply, drain lines and electrical wiring
have been disconnected and the unit has been removed from the duct.
Refer to the blow up view on Page 8. Using a phillips screwdriver, remove the two screws that hold the
baffle plate to the tank. Lift the baffle slightly back to clear the water probe and then straight up and
out of the tank. You can then see the round Z100, or rather what is left of it after a single season.
Notice the heavy scale build up on the Z100 that would have been on your element, if the Z100 was
not there. Use a rag or pliers to grasp the edges of the Z100 and simply unscrew it from the baffle
plate. Rinse off or wipe away any residual scale from the baffle plate and install a new Z100. Leave
a slight gap between the bottom of the Z100 and the baffle plate. Now re-insert the baffle plate into
the tank and secure with the two screws that were removed previously. It’s that simple.
The Z100 can also benefit the older model steam humidifiers. Simply lay the Z100 down into the baffle
plate in the same location as the factory installed model. DO NOT lay the Z100 down into the main
tank. It may come in contact with the heating element and damage it. The dimensions of the baffle
plate prevent the Z100 from falling down into the tank.
The Z100 is just the latest innovation in the AUTOFLO Steam Humidifier line as we continue in our pursuit
of Excellence Without Compromise.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-635-8646
10
E-Mail- info@ewccontrols.com
APPLICATION NOTE
Excellence Without Compromise
EWC
R
AN 147
FAN FAILURE SAFETY
LOCK-OUT CIRCUIT
“Field Provided”
CONTROLS INC.
The use of a safety lock-out circuit is highly recommended. The circuit below is effective at
stopping the humidifier operation if the fan motor fails for any reason. The use of a system
interlock is optional and not required for basic operation. Failure to incorporate a lock-out
can result in excessive condensation inside the duct work and/or possible flood damage,
if the HVAC Fan/Blower fails to operate. This solution is provided as a supplement. Flood or
water damage as a result of not using this diagram is not the responsibility of EWC Controls.
FAN FAILURE SAFETY LOCK-OUT CIRCUIT
S2000 & S2020 HUMIDIFIER
SEPARATE
SAIL SWITCH
OR
CURRENT SENSING
RELAY CONTACTS
TYPICAL
THERMOSTAT
R
W
G
Y
G1
R
G2
H
H
NO
NO
NC
C
K1 COIL
NO
R
W
G
Y
SPDT
K1 Interlock
Basic RELAY
24 VAC COIL
C
FURNACE
SPST
K2 Interlock
Optional RELAY
24 VAC COIL
HUMIDISTAT
K2 COIL
.
EWC Controls Inc. 385 Highway 33
. Englishtown, NJ 07726 . 800-446-3110 . 732-446-3110 . FAX
732-446-5362
“S” series AutoFlo Steam Humidifier
IMPORTANT NOTES:
LOCATION:
Installing the steam unit in the attic is NOT recommended. Freezing temperatures, the possibility of flood damage, the
possibility of producing an environment where mold can start, are all good reasons to avoid this location. However, a
successful attic installation can be performed if the following components and safety measures are included:
1. A safety catch pan should be fabricated and installed directly underneath the entire air handler and the steam unit.
2. Safety catch pan should have a water sensor with fail open dry contacts wired in series with the Steamer control circuit.
3. The Fail safe blower interlock circuit on page 11 should be utilized with all devices included in the diagram.
4. Insulating the water supply line and drain lines is mandatory. If code allows, apply heat tape to the water supply line and
then insulate it.
5. A decision to operate the Steamer without the automatic drain valve may be necessary, if a suitable downgrade slope to
drain is not available. The drain lines should never be trapped, kinked, or routed above the Steamer.
6. A separate High Humidity cut-out should be mounted in the attic itself, and wired in series with the Steamer control circuit.
7. Routine maintenance of the Steamer must be adhered to, and annual inspections for moisture and/or mold on the wood
surfaces should be performed.
8. All ductwork must be completely sealed as the source of excess moisture in the attic will come from leaky ductwork.
WATER SUPPLY:
1. Remember, the Steamer water supply must measure minimum 25 ppm conductivity in order for the processor to reliably
detect the presence of water and the proper water level.
2. Plastic 1/4” water supply tubing is supplied in the box for you however, we recommend the use of copper tubing in most
applications as it is stronger, more reliable, and can support the weight of the WH100 water hammer arrester.
3. Use of a water hammer is highly recommended to dampen out water spikes when the Steamer opens & closes the valve.
Field Notes:
EWC Controls Inc. 385 Highway 33
Englishtown, NJ 07726 800-446-3110 732-446-3110 FAX 732-446-5362