American Standard Humidifier 200A User Manual

READ AND SAVE THESE INSTRUCTIONS  
HUMIDIFIERS  
OWNER’S MANUAL  
For Models *HUMD200A, 300A, 500A  
Includes Safety & Operating Instructions  
and Warranty Information  
* May be "A" or "T"  
10006174  
B2203330A  
5.04  
Pub No. 22-5036-01  
 
INTRODUCTION  
Thank you for your recent purchase of our humidifier. The addition of this  
product to your heating and cooling system will increase your level of  
comfort by adding just the right amount of moisture to your indoor  
environment. During the heating season, your humidifier will not only  
make you feel more comfortable, but it will help protect your home and  
your furnishings, as well.  
Your new humidifier is easy to use and easy to live with. Simple  
maintenance is required on a periodic basis to keep it in peak operating  
condition. This homeowner’s manual will outline these steps for you, as  
well as other basic operating procedures so you can enjoy the full  
benefits of your new humidifier.  
How Your Humidifier Operates:  
During the winter, your comfort relies on two things: the perfect  
temperature and the perfect amount of moisture. Your new humidifier will  
provide your home with the recommended indoor relative humidity to  
ensure your comfort all winter long.  
Replacement Humidifier Pads are available from your installing dealer.  
© 2004 American Standard Inc., All rights reserved  
- 1 -  
 
I. YOUR HUMIDIFIER  
Your new humidifier has been installed to operate in conjunction with the  
blower motor in your furnace. When the Humidifier Control calls for  
humidity and the blower motor is operating, water flows to the distribution  
tray located at the top of the unit. The water is evenly distributed across  
the width of the tray and over the Humidifier Pad. Dry, hot air is moved  
through this moisture laden Humidifier Pad where it is evaporated into a  
vapor. This now humidified air is circulated throughout your home.  
Humidified air helps to reduce static electricity, reduces wood furniture  
from drying out, helps prevent nasal passages from becoming too dry and  
makes your home more comfortable.  
Important Notes About Your Humidifier:  
When the humidifier is operating, there will be a small, steady stream of  
water to drain. Do not use the saddle valve to regulate the water flow. The  
saddle valve is designed to be either completely open or completely  
closed.  
Although your humidifier incorporates a self-flushing action, the Humidifier  
Pad will develop mineral build-up on it over time. To assure high  
capacity, trouble-free performance it should be replaced annually.  
The granular coating on the bottom of the distribution tray is designed to  
provide an even flow of water over the Humidifier Pad. Do not clean the  
mineral scale off the bottom of the distribution tray at the end of  
the humidification season. The scale actually provides an excellent  
track for the water to follow.  
- 2 -  
 
II. OPERATING INSTRUCTIONS  
Models HUMD300A and HUMD500A with Automatic Humidifier  
Control: (Manual Humidifier Control-see pg 4)  
Your Automatic Humidifier Control is installed in the cold air return.  
During the first heating season, your Automatic Humidifier Control needs  
to be set initially to match your home’s condition. Please follow these  
steps when adjusting your control (refer to Figure A).  
1. Turn the dial setting knob to “5,” which is within the normal range.  
During the next 24-48 hours it may be necessary to adjust the dial for  
more or less humidity, depending on your personal comfort and home’s  
requirements. Refer to the “Operation Guide” (Table 1).  
2. During the coldest portion of the first heating season, minor  
adjustments may be necessary. This is dependent upon your individual  
home construction, refer to the “Operation Guide” (Table 1).  
TABLE 1 – Operation Guide  
Condition  
Solution  
Condensation on windows  
Reduce the setting on the control dial  
by 1 increment.  
Lack of humidity  
Increase the setting on the control dial  
by 1 increment.  
Humidifier does not operate  
Turn dial to “Test.” Make certain furnace  
and blower are operating. If unit still  
doesn’t operate, consult your air  
conditioning and heating dealer.  
Humidifier won’t shut off  
Test mode  
Turn dial to “Off.” If unit continues to  
operate, consult your air conditioning  
and heating dealer.  
System operation is checked by setting the  
knob to “Test.” Make certain furnace and  
blower are operating. Humidifier will  
operate for one minute.  
The relative humidity in your home  
will now be accurately controlled  
to meet your needs and should not  
need further adjustment during  
future heating seasons. Make note  
of the dial setting in the event you  
temporarily move the knob when  
performing annual maintenance of  
the Humidifier.  
FIGURE A  
7
6
5
4
Off  
3
2
1
Humidity Level  
- 3 -  
 
Your Automatic Humidifier, is a high precision system that will accurately  
maintain the relative humidity in your home. For every 1°F change in  
outdoor temperature, the control will automatically adjust the indoor  
1
relative humidity (RH) by /2%. If you would like to determine the RH in  
your home, follow these steps:  
1. Determine the outdoor temperature.  
2. Activate the furnace blower by setting your thermostat fan switch to the  
“On” position, or setting your thermostat to a higher temperature.  
3. Turn the control dial setting to the “Off” position. Then, slowly turn the dial  
clockwise until you hear the solenoid valve “click on.” Next, slowly turn the  
dial counter clockwise until you hear the solenoid valve “click off.” At this  
point, make note of the dial setting.  
4. Locate your dial setting on Table 2. Follow the dial setting to the right  
until it intersects with the current outdoor temperature. This is the  
relative humidity in your home under existing conditions.  
5. Return the thermostat and the Humidifier Control to their original  
settings.  
TABLE 2 – % Relative Humidity Guide  
Outdoor Temperature (°F)  
-10  
10  
10  
10  
15  
20  
25  
30  
0
10  
10  
15  
20  
25  
30  
35  
40  
20  
15  
20  
25  
30  
35  
40  
45  
30  
20  
25  
30  
35  
40  
45  
45  
40  
25  
30  
35  
40  
45  
45  
45  
1
2
3
4
5
6
7
10  
10  
15  
20  
25  
30  
35  
As an example, if the outdoor temperature is 20°F, and, following step 3,  
the humidifier turns off at “5” on the dial range, then the RH in your home is 35%.  
The Automatic Humidifier will accurately control the humidity in your  
home to a maximum of 45% RH and a minimum of 10% RH. The values of  
outdoor temperature and dial settings may fall in between or outside of  
the listed values in Table 2. In these cases, you can only approximate your  
home’s actual indoor RH.  
- 4 -  
 
To check the humidifier’s operation, note the current setting and set the  
Automatic Humidifier Control to the test mode when the furnace blower  
motor is operating. Water will flow into the humidifier for 1 minute and  
then it will turn off. This insures the unit is operating properly. Do not  
leave the control in the test mode as it will not operate. Reset the control  
to it’s original setting.  
Model HUMD200A with Manual Mode:  
(Automatic Humidifier Control – see pg 3)  
Your new Humidifier is controlled by a humidifier control installed either in  
the living area (typically near the thermostat) or in the cold air return. It is  
important to anticipate a drop in outdoor temperature and reduce the setting  
accordingly to avoid excessive condensation. For example, with an outdoor  
temperature of 20°F the correct setting will be 35% relative humidity. If the  
temperature is expected to fall to 0°F that evening, then merely reduce the  
setting to 25% several hours prior to the temperature change.  
The recommended settings on the humidifier control are based on years  
of research (see Table 3) and experience as to what is best for the  
average home. These settings represent a compromise between RH levels  
that would be most desirable for comfort reasons and humidity levels that  
are suitable for protection of your home. For example, a wintertime indoor  
RH of 50% may be considered ideal by some, but unfortunately, it  
probably would result in damage to your home. Observance of the  
recommended RH levels on your humidistat, therefore, is an important  
safeguard. Condensation of water on inside windows in the form of  
fogging or frost is usually an indication of too high relative humidities.  
This same condensation can take place in other areas in your home with  
the possibility of damage resulting.  
TABLE 3 – Outdoor-Indoor Relative Humidity  
Outside Temperature  
Recommended RH  
+40°F  
+30°F  
+20°F  
+10°F  
0°F  
45%  
40%  
35%  
30%  
25%  
20%  
15%  
10°F  
20°F  
The humidistat is a precision instrument that can be used to determine  
the RH accurately in your home during the winter. Turn the dial to the  
lower setting, then reverse the dial direction slowly until a “click” is  
heard. At this point, read the RH on the dial. This will be very close to the  
actual RH in your home.  
- 5 -  
 
To check the humidifier operation, set the humidifier control above the click  
point, make sure that the water saddle valve is open and that there is  
electricity to the unit. Generally, the furnace and blower motor must be  
operating for the humidifier control to function. After the humidifier has  
operated for several minutes and water is entering the unit and coming out  
at the drain, reduce the humidifier control setting below the click point and  
the unit should automatically shut off. Now set the humidistat dial at the  
recommended inside relative humidity, depending on the outside  
temperature. Follow the suggested settings prior to a drop in the outside  
temperature.  
Additional Information  
Be sure to keep fireplace dampers closed when not in use. They provide  
an excellent escape route for heat, as well as humidity. Humidity is lost at  
an even faster rate than heat because water vapor tends to seek its own  
level and your humidifier would not be able to replace it even when  
running at full capacity.  
On occasion, indoor moisture producing activities such as clothes drying,  
cooking, showers, etc., may raise the relative humidity level higher than it  
should be, even though the Humidifier is not operating. Telltale  
indications, again, are condensation or frost on cold surfaces such as  
windows, doors, walls, etc. If such condensation persists for several  
hours, your home should be ventilated to dissipate the potentially  
damaging excess moisture.  
III . EFFECT OF WATER CHARACTERISTICS  
Your humidifier will operate effectively using either hot, cold, hard or  
mechanically softened water. Whether to use available tap water, even  
though it may be quite hard, or chemically softened water, is a common  
concern to homeowners when installing a humidifier. Because of the  
humidifier’s design, most of these solids are effectively controlled by  
flushing them down the drain.  
Water used in homes contains varying amounts of minerals. The residue  
remaining as a result of hard water evaporation is primarily calcium and  
magnesium components and is usually quite hard, scaly, and dense.  
Residue from softened water tends to be soft and fluffy and has a greater  
volume than hard water scale. The service life of a Humidifier Pad may be  
extended by using hard water, but in either case, the Humidifier Pad  
should be changed once a year. This is why proper maintenance is  
important and necessary. Service hot water 140°F maximum, is  
recommended with drain type units for increasing capacity.  
- 6 -  
 
IV. ANNUAL MAINTENANCE  
For best performance, we recommend that you replace the  
Humidifier Pad in your Humidifier annually.  
To obtain a replacement:  
• Call the installer of your humidifier.  
This information is often found on your equipment.  
• Call your heating and air conditioning dealer.  
• Look in the Yellow Pages under Humidifying Apparatus  
or Heating & Air Conditioner Contractors.  
• If none of the above are successful and you still need  
information, please feel free to write us or send an email to our  
website.  
V. ANNUAL SUMMER SHUTDOWN  
For Models *HUMD200A, *HUMD300A close the bypass damper .  
AUTOMATIC HUMIDIFIER CONTROL:  
Humidifiers controlled by the Automatic Humidifier Control require no  
control adjustment. Shut off the water supply to the humidifier by closing  
the saddle valve.  
MANUAL HUMIDIFIER CONTROL:  
For humidifiers controlled by a Manual Humidifier Control, simply turn the  
control to the “Off” position. Shut off the water supply to the humidifier  
by closing the saddle valve.  
- 7 -  
 
VI. PERIODIC PREVENTIVE MAINTENANCE  
NOTE: Periodic inspection and preventive maintenance of your total  
heating system is important for efficient and safe operation. Your heating  
dealer should perform humidifier service at the same time.  
All models are equipped with an in-line water strainer and orifice as  
shown below. These parts should be inspected and cleaned periodically to  
assure continued proper unit performance.  
INSPECTION AND SERVICE INSTRUCTIONS  
1. Disconnect electrical power to the furnace  
and shut off water supply.  
2. Disconnect the water line at the inlet  
compression nut.  
3. Remove the in-line strainer from inside the  
inlet fitting by using a small nail or wire.  
4. Flush the in-line strainer clean or replace  
with a new strainer, Service Part No.  
SRA00859.  
5. Replace the in-line strainer and reconnect  
the inlet water line.  
(Double Wrench To Prevent Leaking.)  
6. Disconnect the water line at the outlet  
compression nut.  
7. Remove the orifice from the copper or plastic tube and make sure this  
small opening is unplugged.  
8. Replace the orifice and reconnect the outlet water line.  
(Double Wrench To Prevent Leaking.)  
9. Turn on water supply @ Saddle Valve and reconnect electrical power to  
the furnace.  
- 8 -  
 
MAINTENANCE INSTRUCTIONS for  
HUMIDIFIER MODELS *HUMD200A, *HUMD300A  
CAUTION! Sudden operation may cause personal injury or  
property damage. Turn humidistat or humidifier control to “OFF” or  
lowest setting before servicing.  
4
6
5
8
1
3
1. Front Cover  
2. Drain Hose  
3. Bypass Damper  
4. Humidifier Pad  
Assembly  
5. Distribution Tray  
6. ”V” Notches  
7. Humidifier Pad  
8. Scale Control Insert  
2
7
5
Distribu  
1. Note humidifier control setting and turn dial to the “OFF” position.  
2. Turn off water supply.  
3. At the side of the unit opposite the airflow duct pull front cover (1) off holding with  
both hands and set aside.  
4. Pull out the humidifier pad assembly (4) by grasping at top and tipping out.  
5. Remove the plastic distribution tray (5) from the humidifier pad assembly by  
unsnapping the plastic holding strips from the tabs at the end of the tray. Lightly  
scrape out any mineral deposits and clean the “V” notches (6), but do not scrape  
off the granular coating from the bottom. This textured surface helps ensure even  
water flow for maximum performance. If coating is removed replace distribution tray.  
6. Slide the humidifier pad (7) out from the plastic Scale Control Insert (8). Clean the  
insert frame by twisting and flexing it to loosen the calcium deposits, or use a putty  
knife. Replace the humidifier Pad annually with a #BAYPAD01A1010A humidifier pad  
for Model HUMD200A and #BAYPAD02A1310A humidifier pad for Model  
HUMD300A. Slide the pad back into the insert frame with the colored spot up and  
snap the distributor tray back into place.  
7. Re-install the humidifier pad assembly into the unit by fitting its drain into the round  
receptacle at the base of the unit. Push the assembly in at the top against the  
retaining ribs that will hold it in place. Push the end of the feed tube back firmly into  
the nozzle and replace the front cover.  
8. Remove the drain hose (2) from the bottom of the unit and bend and flex it to loosen  
the internal mineral deposits. Then flush it with water under pressure and slip it  
back onto the black drain fitting.  
9. Turn on water supply @ saddle valve.  
10. Check system operation:  
Manual Humidifier Control: Turn up humidifier control to highest setting and make sure  
the furnace and blower are operating. Humidifier will operate if RH is less than 50%.  
Automatic Humidifier Control: Check system operation by setting the knob to “Test.”  
With furnace and blower operating humidifier will operate for one minute.  
11. Set humidifier or control to its original position.  
- 9 -  
 
MAINTENANCE INSTRUCTIONS for  
HUMIDIFIER MODEL *HUMD500A  
WARNING 120 volts may cause injury from electrical shock.  
Disconnect power and shut off water supply before servicing.  
Sudden operation may cause personal injury  
CAUTION  
or property damage. Turn humidistat or  
Humidifier Control to “OFF” or lowest setting before servicing.  
3
4
5
2
7
6
1. Humidifier Cover Assembly  
2. Base Assembly  
1
3. Humidifier Pad Assembly  
4. Distribution Tray  
5. "V" Notches  
6. Humidifier Pad  
7. Scale Control Insert  
8. Drain Hose  
9. Power Cord  
8
90-858  
9
1. Note Humidifier Control setting and turn dial to the “OFF” position.  
2. Disconnect electrical power and turn off water supply.  
3. Unlatch humidifier cover assembly (1) from base assembly (2) at the bottom of the  
cover, lift, and set aside.  
4. Pull out the humidifier pad assembly (3) by grasping at the top and tipping out.  
5. Remove the distribution tray (4) by unsnapping the plastic holding strips from the  
tabs at the end of the distribution tray. Lightly scrape out any mineral deposits and  
clean the “V” notches (5) but do not scrape off the granular coating from the  
bottom. If coating is removed replace distribution tray. This textured surface helps  
ensure even water flow for maximum performance.  
6. Slide the humidifier pad (6) out from the plastic scale control insert (7). Clean the  
insert frame by twisting and flexing it to loosen the mineral deposits or use a putty  
knife. Replace humidifier pad annually with a #BAYPAD02A1310A humidifier pad.  
Slide the humidifier pad back into the scale control insert with the colored spot up  
and snap the distribution tray (4) back into place.  
7. Re-install the humidifier pad assembly (3) into the base assembly (2). Push the  
assembly (3) in at the top between the retaining ribs that hold the assembly in place  
in a vertical position.  
8. Remove the drain hose (8) from the bottom of the unit. Bend and flex it to loosen the  
internal mineral deposits. Then flush it with water under pressure and slip it back  
onto the drain fitting.  
9. Reinstall cover assembly (1) by hooking at the top of the base assembly (2) and  
latching at the bottom.  
10. Reconnect electrical power (9) and turn on the water supply @ saddle valve.  
11. Check system operation:  
Manual Humidifier Control: Turn up humidifier control to highest setting and make sure  
the furnace and blower are operating. Humidifier will operate if RH is less than 50%.  
Automatic Humidifier Control: Check system operation by setting the knob to  
“Test.” With furnace and blower operating humidifier will operate for one minute.  
12. Set Humidifier Control to its original position.  
- 10 -  
 
LIMITED WARRANTY HUMIDIFIER  
*HUMD0200A, 300A, 500A  
(First letter may be preceded by an “A” or “T”)  
(Parts Only)  
This limited warranty is extended by American Standard Inc., to the  
original purchaser and to any succeeding owner of the real property  
to which the humidifier is originally affixed, and applies to products  
purchased and retained for use within the U.S.A. and Canada.  
If any part of your humidifier (with the exception of the humidifier pad  
and the inline water strainer) fails because of a manufacturing defect  
within five years from the date of the original purchase, Warrantor  
will furnish the required replacement part. Any local transportation,  
related service labor, mechanical filters and diagnosis calls are not  
included.  
This limited warranty does not cover failure of your humidifier if it is  
damaged while in your possession, damage caused by unreasonable  
use of the humidifier and/or damage from failure to properly maintain  
the humidifier as set forth in the Use and Care manual (see Proper  
Maintenance section).  
THE LIMITED WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN  
LIEU OF ALL OTHER WARRANTIES AND LIABILITIES, WHETHER IN  
CONTRACT OR IN NEGLIGENCE, EXPRESS OR IMPLIED, IN LAW OR  
IN FACT, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY  
AND FITNESS FOR PARTICULAR USE, AND IN NO EVENT SHALL  
WARRANTOR BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL  
DAMAGES.  
Some states do not allow limitations on how long an implied limited  
warranty lasts or do not allow the exclusion or limitation of incidental  
or consequential damages, so the above limitation or exclusion may  
not apply to you. This limited warranty gives you specific legal rights,  
and you may also have other rights which vary from state to state.  
Parts will be provided by our factory organization through a service  
organization in your area. If you would like further help or information  
concerning this limited warranty, contact:  
American Standard Inc.  
GW-639-1804  
6200 Troup Highway  
Tyler, TX 75711-9010  
Attention: Manager, After Sales Support  
- 11 -  
 
SERVICE AND HUMIDIFIER PAD REPLACEMENT RECORD  
Date  
Dealer Name  
 
 
Printed in U.S.A.  
 

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