Field Controls S2020, S2000 OWNER MANUAL
This sym bol on
FIG 2
the produ ct means
the produ ct is
listed by
Underwriters
348E
Labor atories, Inc
INSTALLATION INSTRUCTIONS
& OWNER MANUAL
FIELD CONTROLS ELECTRONIC STEAM UNIT - POWER HUMIDIFIER
MODELS S2000 (120VAC) and S2020 (240VAC)
Application: Forced Air Ducted Furnaces, Heat Pumps and Air Handlers
The Steam Humidi er you have purchased has been
designed to be simple to install, operate and maintain.
Read this manual before you install the humidi er.
Figures 1 and 2 will assist you in installing and maintaining
your Steam Humidi er. This product should be installed
according to local and national codes and standards.
Parts included in Steam Humidi er package are:
1. Self-piercing Saddle Valve
2. Installation Instructions and Owner’s Manual
3. Mounting Templates x2
4. Installation Hardware Package
5. Insulation and Tape
6. Automatic Drain Assembly (Shipped loose)
7. Humidistat - Model #072000 (if ordered)
8. 1/2” I.D. Drain Hose - 8 f t
9. Anode #Z100 (located on lower ange of tank ba e)
FIG 2
Options and additional parts recommended:
1. Water Hammer Arrester
2. Anode
3. Decorative Under Duct Cover
4. Gasket Material to seal anges (installer provided)
5. Model APD Current Sensing Switch, or other Air ow Proving Switch.
6. Steam Treament Water Cartridge
Electronic Steam Unit - Power Humidi er
Table of Contents
Speci cations ................................................................................................................................2
Simpli ed Installation Instructions ........................................................................................3
Detailed Installation Instructions ...........................................................................................3
Control Wiring Solutions ..................................................................................................5, 6, 9
Dimensional Data ........................................................................................................................7
Air Ramp .........................................................................................................................................8
Variable Speed Wiring Diagram .............................................................................................9
Relative Humidity Chart ............................................................................................................9
Initial Start-Up Sequence ........................................................................................................10
Start-Up/Service Indicators ........................................................................................10, 11, 12
Service and Replacement Parts ............................................................................................13
Model 07200- Smart Digital Humidistat ............................................................................14
OAS - Outside Air Sensor ...................................................................................................16-19
Anode Assembly (Z100)...........................................................................................................20
Decorative Cover (SC100)....................................................................................................... 21
Water Hammer Arrester (WH-100)........................................................................................22
Water Conditioning System (WC-25)....................................................................................23
Air Proving Device (ADP) ........................................................................................................24
Inside Duct Mounting Bracket (IDB)....................................................................................25
Under Duct Mounting Bracket (UDB)................................................................................. 26
Water Level Probe Replacement ......................................................................................... 27
Water Fill Valve Replacement ............................................................................................... 28
page 2
SIMPLIFIED INSTALLATION INSTRUCTIONS
1. CHECK WATER PROBE ASSEMBLY
2. ASSEMBLE/INSTALL DRAIN VALVE ASSEMBLY
3. INSULATE WATER TANK RESERVOIR
The Insulation MUST be
applied to the tank regardless of the mounting location.
4. LOCATION - Required Criteria
DO NOT INSTALL this unit in an attic period. Do Not Install
this unit in any area that may fall below 35 degrees F.
Installing unit in area 35°F or less will void your warranty!
preferred
If a suitable means of gravity draining the unit is not available
or cannot be provided, the unit will work with the drain valve
electrically disconnected. Call the Technical Support Hotline
for Instructions.
5. WEIGHT - Required Criteria
DO NOT install this unit into berglass duct without
adequate structural support!
6. MOUNTING TEMPLATES
1. Inspect water probe assembly
2. Assemble and install drain valve assembly.
3. Insulate the water reservoir. See Figure 3.
4. Select the mounting location on the duct and tape on the
mounting template.
5. Drill the (8) 1/8” mounting holes.
6. Cut out the humidi er opening in the duct.
7. Insert the humidi er into the opening and screw in place.
8. Connect the drain line.
9. Flush and connect the water line.
10. Make 24VAC electrical connections to achieve fan operation
and Interlock circuit.
11. Install and connect to humidistat.
12. Plug power cord into a grounded dedicated 120VAC, 20 amp
outlet for S2000 (240VAC, 15amp for S2020).
DETAILED INSTALLATION INSTRUCTIONS
1. CHECK WATER PROBE ASSEMBLY
Before installing drain valve assembly, inspect water probe
assembly. Heater element should be ¼” away from the brass
water temperature sensor. The wire probe must be vertical
(pointing towards bottom of reservoir). Check for alignment of
probe assembly prior to installation. Probe may have been
shifted in position or become loose during shipping. Probe
assembly must be tight and should not rotate. If loose,
remove cover and tighten water probe nut. Refer to probe
supplement insert on page 28.
2. ASSEMBLE/INSTALL DRAIN VALVE ASSEMBLY (See gure 18)
Before assembling the drain valve assembly, apply water
tight sealant to all metal to metal connections. Connect the
drain cock valve to the “T” adapter, then the “T” adapter to
the solenoid. Connect the barbed tee to the solenoid and
then connect the over ow tube. After installation, insert the
Molex plug into the right side of the steam humidi er
control panel socket.
3. INSULATE WATER TANK RESERVOIR
With insulation foil side down, remove adhesive backing.
Align humidi er so that front side of unit meets long edge of
insulation. Fold insulation up onto sides of humidi er and
press rmly. Apply 5 continuous strips from the tape
provided to seal the foil as shown. The tape will prevent the
sharp duct edges from damaging the foil. Use additional foil
tape to repair damage to the foil.
applied to the tank regardless of the mounting location.
The Insulation MUST be
FIG 3
INSULATION
(FOIL SIDE OUT )
USE TAPE TO SEAL THE
FOIL TO THE FRONT
MOUNTING PLATE
(3 PLACES-SIDE AND BOTTOM)
USE TAPE TO SEAL
OUTSIDE EDGE OF
THE FOIL (2 PLACES)
4. LOCATION - Required Criteria
DO NOT INSTALL this unit in an attic period. Do Not Install
this unit in any area that may fall below 35 degrees F.
Installing unit in area 35°F or less will void your warranty!
The steam humidi er can be installed in either the warm air
supply or the cold air return ducts; however the
location would be in the warm air supply duct of the system.
This humidi er does not require warm air to evaporate the
water in order to provide humidity, but it will operate more
e ciently in the warm air duct and condensation is less likely
to occur on the surrounding cold surfaces. E ciency is lost
in a return air duct location.
When selecting a location on the duct, be certain that there is
enough room in the duct for the water reservoir. There should
be at least ve (5) inches above the reservoir and the reservoir
should not occupy more than about 25 percent of the duct
space. If this criteria cannot be met, you should install the unit
under the duct by means of the tank ange. See Figure 13 and
UDB supplement insert on page 27.
If a suitable means of gravity draining the unit is not available
or cannot be provided, the unit will work with the drain valve
electrically disconnected. Call the Technical Support Hotline
for Instructions.
It is highly recommended but not required that the use of
Fiberglass duct-board with this product includes an anti-
microbial treatment.
5. WEIGHT - Required Criteria
Providing Adequate Structural Support for this unit is the
responsibility of the Installer. It is recommended to reinforce
the cut openings with folded lengths of sheet- metal to provide
rigidity to the duct opening.
Now the screws must pass through 3 layers of metal when
inserted.
adequate structural support!
9 lbs. empty and 15 lbs when full of water.
6. MOUNTING TEMPLATES
Two mounting templates are provided. Choose the correct
template for your mounting method. Tape the mounting
template to the duct. The template must be leveled using the
top of the cutout on the template.
The template should be located so that the bottom of the
preferred
DO NOT install this unit into berglass duct without
Both models weigh approximately
page 3
reservoir cut-out is ush with the inside of the bottom of the
7. DRILL HOLES AND CUT OPENINGS
8. WATER SUPPLY - Required Criteria
A. WATER SUPPLY USING THE SADDLE VALVE FURNISHED WITH
UNIT.
NOTE:
NOTE:
NOTE:
NOTE:
NOTE:
B. OVERFLOW & DRAIN LINES - Required Criteria
DO NOT route the hose above the
humidi er.
9. MOUNTING THE STEAM HUMIDIFIER
NOTE:
10. STEAM OPERATION - Required Criteria
duct for horizontal duct mount. Most ducts are insulated allow for
additional space, about one (1) inch, must be accounted for
when determining the location for the bottom of the reservoir
cut-out. If you are mounting it under the duct, make sure the duct
is level.
7. DRILL HOLES AND CUT OPENINGS
Safely predrill eight 1/8” diameter mounting holes in the duct.
These can be drilled through the template at the locations
indicated on the template.
Safely remove the air duct material by cutting along the
mounting template cut lines.
Insert and/or mount the Humidi er and secure it to the duct with
the provided screws.
FIG 4
B. OVERFLOW & DRAIN LINES - Required Criteria
The use of an over ow 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 tting and use a hose clamp
to secure. Route the hose to a suitable drain, avoiding kinks,
traps and sharp objects.
humidi er. Failure to install all necessary drain lines may result in water leaks during normal operating conditions, and
voids all warranties.
When routing the S2000 drain hose into a condensate
pump, be sure to cut the end of the hose at a sharp angle
to prevent the hose from bottoming out in the pan. It could
result in poor draining or no draining at all. Failure to do so
may result in water backing up into the S2000 reservoir and
eventual over ow. See Figure 5.
DO NOT route the hose above the
CUT ON LINE
MOUNTING TEMPLATE
MODEL S2000 & S2020
1. TAPE TEMPLATE IN LEVEL P OSITION.
2. DRILL (8) H OLES FOR SHEET ME TAL SC REWS
SHOWN ON TE MPLATE (DO NOT DRILL
LARGER T HAN 1/8” DIAMETER .
3. USE SOLID LI NE TO CUT OUT OPENING F OR
HUMIDIFE IR
4. MOUNT HU MIDIFIER PER INSTRU CTION.
CUT ON LINE
8. 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 cold water line. Avoid
connecting to water lines from a Reverse Osmosis system or
De-ionized water systems. The supply water must read a
minimum of 25 ppm in order for the Steam unit to reliably
sense the water.
NOTE: Never install the saddle valve on the bottom of the water
pipe. Sediment in the water pipe may clog the saddle valve. Flush
the line before connecting to the unit. 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” tting with a valve may be required to meet code or, if low
water pressure causes frequent water alerts on the steam
humidi er.
NOTE: Flush the new water line before connecting it.
NOTE: The use of City water or Municipal water is preferred.
Softened water is preferred over untreated well water. Specify the
Optional WC-25 disposable water lter for treating any water
supply that is very high in mineral content. Refer to water
conditioning system supplement insert information on page 24.
NOTE: Use optional water hammer arrester (WH-100) if water
spikes occur (pipes bang) during ll ups. Refer to water hammer
arrester supplement insert information on page 23.
page 4
CORRECT
DRAIN HOSE
INCORRECT
COMPENSATE
PUMP
X
FIG 5
9. MOUNTING THE STEAM HUMIDIFIER
Use gasket material to seal where the front plate or tank
ange contacts the duct-work. Place the humidi er
reservoir into the opening in the duct and secure with eight
(8) sheet metal screws. Refer to page 8 and 9 for additional
humidi er mounting location information.
NOTE: If the duct-work will not support the unit in a level
position with the reservoir full of water, the duct-work
must be reinforced. Both steam models weigh approximately 9 lbs. empty and approximately 15 Lbs. when full of water.
10. STEAM OPERATION - Required Criteria
Because of the high humidity output of the steam
humid er, it must not be operated without proper fan
operation. The steam humidi er is designed to be
"Dominant" over the HVAC System Blower. The "System"
Blower will be operated by the humidi er when the water
tank temperature reaches 170° F. A minimum of 800 cfm @
800-900 fpm is required for proper operation of the steam
humidi er. Lower velocities may result in excessive
condensation inside the duct. See Air Proving Feature under
section 11 B. See Variable Speed on Page 9.
A temperature sensor is mounted in the water reservoir of
the humidi er. As the water temperature increases to about
170° F, the computer closes a set of blower relay contacts
to start the HVAC system fan. When the water cools to
about 140° F, the computer will open the relay contacts to
shut o the fan. This operational sequence drastically
decreases the chances of condensation occurring inside the
duct-work.
11. WIRING THE STEAM HUMIDIFIER
11. WIRING THE STEAM HUMIDIFIER
IMPORTANT:
Failure to do so will void all warranties.
DO NOT
DO NOT
Doing so will void all warranties.
A. INSTALLINGAND WIRING THE HUMIDISTAT
NOTE:
Follow wiring instructions carefully!
DO NOT
connect any foreign voltage to the “H”
terminals
of the humidi er!
B. FIELD WIRING
AIR PROVING FEATURE:
WARNING:
IMPORTANT NOTE:
IMPORTANT: Dedicated fused circuits and outlets of the
proper voltage and current ratings must be provided. Use a
NEMA 5-20R receptacle for the S2000 and a NEMA 6-15R
receptacle for the S2020. All wiring must conform to local
and national codes.
Failure to do so will void all warranties.
DO NOT cut o the grounded plug and/or hard wire this unit
to line voltage!
unit!
Doing so will void all warranties.
A. INSTALLINGAND WIRING THE HUMIDISTAT
DO NOT use extension cords to operate this
A humidistat, such as the Model #072000 is required to
control the Steam Humidi er. The humidistat may be
installed on the wall in the living space or on the return air
duct.
NOTE: Continuous fan operation should be initiated
if the humidistat is installed on the return air duct!
Instructions for installation are packaged with each
humidistat.
DO NOT
of the humidi er! The Humidi er supplies its own control
Follow wiring instructions carefully!
connect any foreign voltage to the “H”
terminals
voltage. Simply connect the two “H” terminals straight to
any dry contact humidistat terminals.
If you are using a 3rd party Humidistat that has powered
terminals, you must use an isolating relay to operate the
Steam Humidi er. Failure to do so will result in circuit
board failure and will void all warranties.
FIG
Heat
ONLY
Thermostat
at R
R W G
Typi cal
Furnace
6
Heat Only System and
Steam Humidi er with standard
dry contact Humidistat
S2000 & S2020 Hu midi er
Low Voltage Term inal Block
G1
Dry Conta ct
Humidistat
062000 Humidistat
AHG2RH
Fact ory
Jumper will
stay in plac e
unless a eld
install ed Air
Proving Device
is used.
A
B. FIELD WIRING
Schematics on the following pages describe the
suggested interlock wiring arrangement for di erent
HVAC systems. Interlocking may be performed on systems
that provide a 24VAC NEC Class 2 terminal block for system
control.
AIR PROVING FEATURE: The Steam Humidi er has an
integrated air proving feature that allows the user to install
a current sensing switch, air ow proving switch and/or
high humidity switch in the duct and easily achieve fail safe
shutdown in the event of fan/blower failure. This feature
prevents the Steam Humidi er from operating unless
adequate air ow is proven thereby avoiding a saturated
duct condition. Refer to Air Proving Device Current Sensing
Switch Supplement insert information on page 25.
WARNING: It is highly recommended to use an air ow
proving device. In particular Duct-Board applications
should always use an air ow proving device.
A factory jumper wire is provided and must be removed
w h e n c o n n e c t i n g t h e s a f e t y s w it c h o r o th e r eld supplie d air
ow proving device. Leave the jumper in place if you
decide not to use the air ow proving feature.
IMPORTANT NOTE: If the Steam Humidi er is removed and
disconnected from the system, the blower interlock circuit
must be restored to its original con guration. Failure to do
so may result in loss of blower operation during cooling
mode.
page 5
Note
WARNING: DO NOT perform this test with the wires
connected to the Steam Humidi er. Temporarily
disconnect them. Refer to Figure 11.
AIR PROVING DEVICE TEST:
CONTROL WIRING SOLUTIONS FOR VARIOUS HVAC SYSTEMS
Additional diagram shown on page 5
The latest improvement to the Field Controls
humidi ers is the new “Air ow Interlock Feature” provided
on the low voltage terminal block. Due to popular demand
we have made it easier for you to achieve fail safe lockout in
the event the fan or blower on the HVAC system does not
operate when called upon. A high humidity or air ow
proving device is necessary.
You must still determine the type of proving device you
want to use. We recommend our new Model APD switch,
(P/N: 090558A0001). Refer to APD Application
contained in this manual. But then all you have to do
is connect two low voltage wires from your air proving
device straight to the Steam Humidi er’s “A” terminals. No
additional eld relays or components are needed.
The Steam Humidi er monitors the air ow circuit
anytime it is operating the blower on the HVAC
system. If the Steam Humidi er detects a loss of air ow
longer than 1 minute, it will shutdown the heating
element and stop producing eam to avoid saturating
the duct.
You must test the air proving device when you install
it to make sure it will function properly.
Note
WARNING: DO NOT perform this test with the wires
connected to the Steam Humidi er. Temporarily
disconnect them. Refer to Figure 11.
AIR PROVING DEVICE TEST:
1. After installing the air proving device, test for
continuity across the normally open contacts with the
fan/blower o . You should read in nity (nocontinuity)
when the fan/blower is o .
2. Turn on the fan/blower at the thermostat and test for
continuity across the normally open contacts with the
fan/blower running. You should now read continuity (a
complete circuit) when the fan/blower is running.
page 6
12. HUMIDIFIER MOUNTING LOCATION
12. HUMIDIFIER MOUNTING LOCATION
Figure 12 re ects the basic dimensions of the S2000 or S2020 Steam Humidi er. This data is useful in determining the room needed to
install the unit in a certain location. The data can also be used to determine the minimum duct size the Steam Humidi er can be inserted
into. The Steam Humidi er should not obstruct more than 25% of the cross sectional area of the selected duct. For Example: The humidi er tank measures 8 inches wide (including the ange) times the length of 11.6 inches=92.8 square inches. We are only concerned with the
obstruction on a at plane. Which is why the ange is taken into account but not the depth of the tank. This assumes an up- ow con guration. If the con guration is horizontal, then the Steam Humidi er will obstruct approximately 70 square inches of duct area. The tank
ange is no longer a factor.
At 92.8 square inches, the smallest duct plenum that can accommodate the Steam Humidi er mounted internally would be approximately
20” by 19”. 20x19=380 square inches multiplied by .25 = 95 square inches.
Steam Humidi er square inches of obstruction= 92.8 square inches. Up- ow con guration. 25 percent of 20x19 duct= 95 square inches.
Steam Humidi er square inches of obstruction= 69.6 square inches. Horizontal- ow con guration. 25 percent of 12x24 duct=72 square
inches.
In either case, avoid installing the Steam Humidi er on any duct size where the unit will consume more than 25% of the cross sectional
area of the duct at the point of insertion. Doing so may result in turbulent air ow, lower velocities and condensation inside the duct. Avoid
all of these conditions by selecting an “under the duct” location and specify the SC100 decorative tank cover to give it a nished look.
page 7
Suitable locations to install your
Caution: UV lamps may destroy certain plastics/rubber unless shielding
is applied to those surfaces.
DO NOT
DO NOT
Steam Humidi er on an Up- ow
or horizontal HVAC System. Notice
that some of the locations are X’d
out. These are poor locations for the
Steam Humidi er and may result
in lower capacity output and/or
excessive condensation. Try to avoid
mounting the unit within 2 feet of
any 90 degree turns. Allow at least 5
inche s of clearance above the tank.
The unit should not be installed
within 5 feet of an Electronic Air
Cleaner, 4-5 inch thick Media lters,
or a UV Lamp.
Caution: UV lamps may destroy certain plastics/rubber unless shielding
is applied to those surfaces.
DO NOT install the Steam Humidi er
on a Down- ow HVAC system. Avoid
Fiberglass Duct-Board as it cannot
support the weight of the Steam
unit when full of water.
stall the Steam Humidi er in an attic
or crawl space exposed to freezing
temperatures.
DO NOT in-
AIR RAMP
Improves velocity
Remember to insulate the water
reservoir with supplied insulation.
under extreme velocities it m ay be
necessary to double wrap the tank
and/or the tank ange to prevent
excessive heat loss. Also remember to
use gasket material on duct opening
to prevent metal to metal heat loss
and to prevent against condensation
and air leakage.
AIR RAMP (FOR UNDERDUCT MOUTNING ONLY)
-FABRICATE FROM CORROSION-RESISTANT SHEET METAL
(CUTOUT FROM METAL DUCT TO BE USED)
- ATTACH TO UPSTREAM EDGE OF CUTOUT
-DO NOT OBSTRUCT MORE THAN 25% OF THE DUCT AREA
page 8
14. SETTING THE HUMIDISTAT
14. SETTING THE HUMIDISTAT
“Relative Humidity Chart”
IMPORTANT:
13. VARIABLE SPEED
It is recommended that humidistat settings of 30-45% not be
exceeded. If condensation is noticed on windows during very
cold outside temperatures, the humidistat setting should be
lowered.
The maximum recommended relative humidity for your
home depends upon many factors such as outdoor air
temperature, type and placement of insulation, vapor
barriers, e ectiveness 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 most
comfortable with. Also, as the outdoor temperature uctuates,
it may be necessary to adjust the humidity level of your system
a few times during the heating season.
Refer to the
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.
IMPORTANT: If the humidi er is installed in the return air plenum
the humidistat must be located at least ve (5) feet upstream
from the humidi er. Fan should be operated in continuous mode
when the humidistat is mounted in the return air plenum.
Mounting the humidistat on an interior wall is always preferable
to mounting on the return duct. But mounting the humidistat on
an interior wall takes more time, material and labor than a return
duct location. Sometimes it may be impossible to mount a
humidistat on an interior wall and the return duct location is the
only solution.
“Relative Humidity Chart” as a starting point for
Variable Speed WIRING DIAGRAM RELATIVE HUMIDITY CHART
FIG 15
13. VARIABLE SPEED
The diagram above should be followed if it is required to operate the fan system at high speed during the humidify operation. Such a requirement may be
necessary if condensation occurs inside the duct-work due to the lower velocities of a variable speed system when only the fan is running.
The “Y” circuit must be wired exactly as shown to achieve the correct operation. This wiring con guration may result in the loss of the “enhanced” latent
e ect operations of your variable speed HVAC system. If you do not want this to happen, you should consider installing a di erent type of whole house
humidi er that does not require dominance over the HVAC fan and full CFM capacities while operating.
Variations on this diagram are available. Contact Field Controls Technical Support Hotline.
page 9
15. START-UP & OPERATING SEQUENCE
16. SERVICE “LED” INDICATORS
INITIAL START-UP SEQUENCE OF OPERATION SERVICE “LED” INDICATORS
NOTE:
D. BLOWER:
E. The "FILL" LED
F. DRAIN:
NOTE:
NOTE:
15. START-UP & OPERATING SEQUENCE
Once the Steam Humidi er has been installed
and the water, drain, humidistat and blower
interlock connections completed, the humidi er
may be started.
A. Disconnect the water line. Turn on the water
supply and ush the line into a bucket.
Reconnect the water line.
B. Set the humidistat to a setting higher than the
room RH level.
C. Plug the S2000 Humidi er line cord into a 120
VAC, 20 amp source. (240VAC, 15amp for S2020).
D. The Green "POWER" LED should blink rapidly and
the drain valve will open momentarily upon
initial startup. The "FILL" LED will illuminate and
water should begin to ll the Water Pan. The
Power LED will now blink slowly.
E. When the water has reached the probe level
the "FILL" lamp and ll valve will be turned o ,
and the "HEATER" LED and heater element will
be turned on. The “POWER” LED will blink slow
and steady.
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 humidi er is operating properly.
16. SERVICE “LED” INDICATORS
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 ashing when there is power to the
unit, the CPU and/or circuit board may have
failed.
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
lling.
C. HEATER: When the water reaches its 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 humidi er is unplugged while in
steaming operation and then plugged back in, a
rapid ashing 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. To accelerate a cool
down, simply turn the HVAC system fan on via
the thermostat.
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 illumi
nated at the sametime and the "POWER" LED will
be blinking slowly.
E. The "FILL" LED will illuminate and the water
reservoir will re ll at irregular intervals, depending
on the boil o rate. The "HEATER" LED should
remain illuminated unless the humidistat opens or
the humidi er enters a drain cycle or failure mode.
. DRAIN: This LED will be illuminated when the
microprocessor cycles the humidi er into a Mainte
nance 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 ll valve will open
to re ll the reservoir and resume normal operation.
This mode will last about one hour and the micro
processor will automatically restart the unit after
wards, if there is a call for humidity. This drain cycle
will occur once every 8-12hours, to reduce the min
eral concentration in the tank and let the heater
cool- down. 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 humidi ers is
called “Fill on Request”. The unit will not re ll
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.
page 10
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