Field Controls 094021a0104p, 094021a0004p Owner's Manual

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Installation

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Instructions &
Owner's Manual

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.

WATER INLET

WATER LEVEL
PROBE

HEATER

TEMPERATURE PROBE

FIG. 1

Familiarizing yourself with the items listed in Figures 1
and 2 will assist you in installing and maintaining your
Steam Power Humidifier.

WATER PAN

TANK BAFFLE

FOR DRAIN
VALVE DETAILS
SEE FIG. 8

WATER INLET

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OVERFLOW

"T" ADAPTER

MANUAL WATER DRAIN

BLOWER

INTERLOCK &

HUMIDISTAT CONN.

STATUS LIGHTS

AUTO DRAIN CONN.

FIG. 2

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

Copyright 1999-2003 EWC Controls All Rights Reserved.

C

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

SIMPLIFIED INSTALLATION INSTRUCTIONS

1. Insulate the water reservoir. See figure 3.

2. Select the mounting location on the duct and tape
on the mounting template.

3. Drill the (8) 1/8" mountings holes.

4. Cut out the humidifier opening in the duct.

5. Insert the humidifier into the opening and screw in
place.

If the humidifier installation does not meet the required criteria, consider using a different Autoflo model humidifier
such as a SC15 or 200P.

6. Connect the water line.

7. Connect the drain line.

8. Make 24 VAC electrical connections to blower
interlock.

9. Install and connect the humidistat.

10. Plug power cord into a grounded dedicated 120 VAC, 15
amp outlet for S2000 (240 VAC, 10 amp for S2020).

DETAILED INSTALLATION INSTRUCTIONS

1. INSULATE WATER TANK RESERVOIR

With insulation foil side down, remove adhesive backing.
Align humidifier so that front side of unit meets long edge of
insulation. Fold insulation up onto sides of humidifier and
press firmly. 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. The Insulation MUST be
applied to the tank regardless of the mounting location.

INSULATION
(FOIL SIDE OUT)

3. WEIGHT - Required Criteria

If the humidifier is installed on fiberglass duct, the
installer must provide structural support for the unit.

The fiberglass duct alone will not support the weight of the
steam humidifier, which is 9 Lbs. empty and 15 Lbs. when
full of water. Providing Adequate Structural Support for
this unit is the responsibility of the Installer

4. MOUNTING TEMPLATE

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 reservoir cut-out is flush with
the inside of the bottom of the duct for horizontal duct. Since
most ducts are insulated this 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.

USE TAPE TO SEAL THE FOIL
TO THE FRONT MOUNTING PLATE
(3 PLACES-SIDES AND BOTTOM)

FIG. 3

USE TAPE TO SEAL
THE OUTSIDE EDGE
OF THE FOIL
(2 PLACES)

2. LOCATION-LOCATION - Required Criteria

DO NOT INSTALL this unit in an attic unless freeze
and flood protection measures are taken! See page 12

for details. The steam humidifier can be installed in either the
warm air supply or the cold air return ducts; however the
preferred location would be in the warm air supply duct of the
heating system. This humidifier does not require warm air to
evaporate the water in order to provide humidity, but it will
operate more efficiently in the warm air duct and
condensation is less likely to occur on the surrounding cold
surfaces. Efficiency 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 five (5) inches above the reservoir and the reservoir
should not occupy more than about 25 percent of the duct
space. If this criteria can not be met, you should install the unit
under the duct by means of the tank flange. A template is
provided for installing the unit under the duct, on the cold air
return.

A suitable means of gravity draining the unit should be
available, Although the unit will work with the drain valve
physically or electrically disconnected. See page 12.

5. DRILL HOLES AND CUT OPENINGS

Use an electric drill, with grounded power cord, to drill eight
(8) mounting holes, 1/8" diameter, in the duct. These can be
drilled through the template at the locations indicated on the
template.

A saber saw or tin snips can be used to cut out the water
reservoir opening.

CUT ON LINE

MOUNTING TEMPLATE

MODEL S2000 & S2020

CUT ON LINE

1. TAPE TEMPLATE IN LEVEL POSITION.

2. DRILL (8) HOLES FOR SHEET METAL SCREWS
SHOWN ON TEMPLATE (DO NOT DRILL LARGER
THAN 1/8" DIAMETER.

3. CUT OUT SOLID LINE AREA AS MARKED.

4. MOUNT HUMIDIFIER PER INSTRUCTIONS.

CUT ON LINE

2

CUT ON LINE

FIG. 4

P/N 094021B0037

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.

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.

Note: Use a water hammer arrester (WH-100)

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.

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.

7. M OUNTING 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.

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.

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.

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. INSTALLING AND 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.

S2000 & S2020 Typical Wiring
and Blower Interlock Diagram

S2000 & S2020 Humidifier

Typical

Thermostat

G YWR

G YWR

Furnace

FIG. 5

B. FIELD WIRING

Heat & Cool System

G1 R G2 H H

Humidistat

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

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:

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

S2000 & S2020 Humidifier

Heat only

Thermostat

WR

GWR

Furnace

FIG. 6

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.

Heat Only System

G1 R G2 H H

Humidistat

10. SETTING THE HUMIDISTAT

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.

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.

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.

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
Outside
Temperature

-10 Deg. F

0 Deg. F

10 Deg. F

Relative

Humidity

40%
60%
80%

40%
60%
80%

40%
60%
80%

Indoor Relative

Humidity

When Outside

Air Is Heated To

72 Degrees F

1%
2%
2%

2%
2%
5%

4%
5%
7%

Maximum Safe

Recommended Indoor

Relative Humidity

20%

25%

30%

20 Deg. F

30 Deg. F

40%
60%
80%

40%
60%
80%

6%
8%

11%

8%
13%
17%

4

35%

40%