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Model 1099LHS Humidifier Installation Manual

•  The operating principle of the humidifier is based on the most efficient and economical means of evaporating 

water to the air.  The humidifier uses only 2.5 watts of electrical power during operation, less than the 
smallest household light bulb.  The heat necessary for evaporating water is produced by the furnace.  The 
water supply to the humidifier is controlled by the electric solenoid valve.  The humidistat connected in series 
with the solenoid provides low voltage control of the humidifier.  The humidistat is designed for wall mounting 
in the living area or surface mounting on the return air duct. 

•  Water flows through a strainer, is metered through an orifice to provide the proper amount of water, and is 

supplied to the Vapor Pad

®

 by the distributor trough.  Approximately 

200 CFM of air is by-passed from the warm air plenum through the 
humidifier and returned to the cold air plenum.  Moisture is evaporated 
to the air passing through the Vapor Pad

®

•  Minerals are not blown into the air stream as occurs in atomizing 

humidifiers; they are left on the Vapor Pad

®

 where a high percentage is 

carried off with the waste water.

•  When the humidifier is installed and operating, no adjustments are 

necessary other than setting the control knob on the humidistat to 
the desired level of humidification.  Set knob on the humidifier to 
"HI" or "WINTER" position. To turn the humidifier off, close the water 
supply valve, switch electrical power off and turn the humidistat off.  
If furnace is used for summer cooling or ventilating set air damper on 
"LOW" or "SUMMER".

• 

CAUTION:  

Do not set relative humidity too high during cold weather.  Excessive humidity may cause 

condensation on windows or in walls.  Refer to recommended settings as described in the humidistat owners 
manual.

How the Humidifier Works

At Outside 

Temperature

Recommended 

Setting

-20°F

-29°C

15%

-10°F

-23°C

20%

0°F

-18°F

25%

+10°F -12°C

30%

+20°F

-7°C

35%

+30°F

-1°C

40%

!

Maintenance

Your Humidifier is engineered to give helpful and trouble-free humidification.  For maximum efficiency the following 
cleaning procedures should be carried out at the end of each heating season:
     

1.  Turn off water supply and electrical power to humidifier.
2.  Remove cover, water distributor trough, Vapor Pad

®

, pad rails and drain pan.  Clean excessive mineral   

    

deposits from the distributor trough, drain pan, pad rails and humidifier cabinet.  A solution of 1/2 vinegar & 1/2  
water will help loosen mineral deposits.  Inspect drain hose, clean or replace as necessary.

3.  Insert a new GA19 (GFI #7919) Vapor Pad

®

 (black notch on top).  Install trough, pad rails and drain pan.  

Replace cover, reconnect electrical plug. Replace Vapor Pad

®

 yearly for peak performance.

4.  In heavy mineral areas, or if the solenoid valve fails to function, disconnect the 1/4” water supply line from the 

solenoid valve.  Carefully pull the strainer screen from the valve body.  Clean the mineral deposits from all parts.   
If the orifice is clogged, it may be opened by inserting a small pin.  Reinsert the filter into the valve body.

5.  Reconnect the 1/4” water line to the solenoid valve if necessary.  Turn on the water supply and check all points 

for leakage.  The operation of the unit may be checked by starting the furnace.  The humidifier operates only 
when the furnace blower is running or the burner circuit is energized.  The humidifier is now ready for operation.

6.  During the summer, turn off water supply and electrical power to humidifier.

Summary of Contents for 1099LHS

Page 1: ...y Commercial installation voids warranty Modification or alteration of product parts installation instructions or local safety codes voids warranty Read our full warranty policy at the end of this doc...

Page 2: ...ring the Control 6 How the Humidifier Works 7 Maintenance 7 Parts Drawing 8 Humidifier Chassis Duct Cut Out 8 Trouble Shooting 9 FAQ s 10 Warranty Registration 11 Limited Warranty 11 12 1099LHS Table...

Page 3: ...Air Plenum Right or Left Plenum Opening 14 1 8 W X 12 H Bypass Duct 7 Pallet Qty 16 Cabinet Construction UV Stable Automotive Grade Plastic Humidistat Models MHX3C Included Voltage 24V In The Box Hum...

Page 4: ...e 7 circle 10 to 15 from side of humidifier on cabinet centerline using connecting collar as guide 2 Cut out center section of template and 7 hole Humidifier is self retaining Slide top side in first...

Page 5: ...8 Turn handle counterclockwise to open saddle valve leave open for several seconds to flush dirt from pipe and tubing Steel Brass or Hard Plastic Pipe 1 Shut off water supply and drain pipe 2 Turn ha...

Page 6: ...L ELECTRICAL CODES Thin Gasket Face FIG 1 WALL MOUNT Use Outer Inner Portions DUCT MOUNT Use ONLY Outer Portion Mounting Base Thick Gasket DUCT MOUNT ONLY 1 Locate the humidistat at least 24 upstream...

Page 7: ...set relative humidity too high during cold weather Excessive humidity may cause condensation on windows or in walls Refer to recommended settings as described in the humidistat owners manual How the H...

Page 8: ...AIL GA 19 EVAPORATOR PAD 900 15 DISTRIBUTOR TROUGH 900 13 COVER P102 COMPRESSION SLEEVE BRASS P190 COMPRESSION SLEEVE PLASTIC P101 COMPRESSION NUT 900 1 CHASSIS 900 9 NOZZLE 900 10 SPOUT GA4040 SOLENO...

Page 9: ...changed replaced your Vapor Pad at the proper intervals once per year to ensure the greatest production of moisture Check the setting of your humidistat to ensure it is set higher than current humidi...

Page 10: ...The coating is similar in composition to the minerals that accumulate on the pad If you subject the Vapor Pad to cleaning you usually remove much of the coating and the pad becomes ineffective This r...

Page 11: ...calls or in removing repairing servicing or replacing parts is not covered under this Limited Warranty What is Not Covered Cont Shipping charges are not covered by this Limited Warranty Agreements ma...

Page 12: ...anufacturer will in no event be liable for incidental or consequential damages This limited warranty gives you specific legal rights and you may also have other rights which vary from state to state S...

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