Aprilaire 550 Humidifier User Manual
Contents
1. or lowest setting before servicing 1 Front Cover 2 Feed Tube 3 Integral Damper 4 Water Panel Evaporator Assembly 5 Distribution Tray 6 V Notches 7 Water Panel 8 Scale Control Insert 9 Drain Hose 1 Note Humidifier Control setting and turn dial to the OFF position 2 Turn off water supply 3 Press the tabs in the latches on the top and bottom of front cover 1 and pull cover off base with both hands Set aside 4 Carefully pull the plastic feed tube 2 out of the distribution tray 5 at the top of the Water Panel evaporator assembly 4 Pull this assembly out by grasping at top and tipping out 5 Remove the distribution tray 5 from the water panel evaporator assembly by lifting straight up from the scale control insert 8 Lightly scrape out any calcium 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 See page 3 if removed 6 Slide the Water Panel evaporator 7 out from the Scale Control Insert 8 Clean the insert frame of calcium deposits with a putty knife Inspect Water Panel evaporator Stock No 35 for Model 600 and substitute a new Genuine Aprilaire Water Panel if necessary Slide the Water Panel back into the scale control insert with the colored spot up and snap the distribution tray back into place 7 Re install the Water Panel evaporator ass2. 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 11 Check system operation Humidifier Control Automatic or Manual Check system operation and reset change water panel indicator by setting the knob to Test Reset With furnace blower operating and furnace calling for heat humidifier will operate for one minute 12 Set Humidifier Control to its original position NOTE The motor is permanently lubricated and does not need to be oiled 13 MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODEL 550 CAUTION Sudden operation may cause personal injury or property damage Turn Humidistat to off or lowest setting before servicing 1 Front Cover 2 Feed Tube 3 Nozzle 4 Water Panel Evaporative Assembly 5 Distribution Tray 6 V Notches 7 Water Panel 8 Scale Control Insert 9 Drain Hose 1 Note Humidistat setting and turn dial to the OFF position 2 At the side of the unit opposite the airflow duct pull front cover 1 off holding with both hands and set aside 3 Carefully pull the plastic feed tube 2 out of the nozzle 3 at the top of the Water Panel evaporative assembly 4 Pull this assembly out by grasping at top and tipping out 4 Remove the distribution tray 5 from the Water Panel evaporative assembly by unsnapping the plastic ends of the Scale Control Insert 8 fr
3. excess moisture levels V 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 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 Water Panel evaporator may be extended by using hard water In either case the Water Panel evaporator is usually changed once a year with the exception of the Model 400 which should be changed twice a heating season In the drain equipped models most of these solids are effectively controlled by flushing them down the drain Service hot water 140 maximum is recommended with drain type units for increasing capacity and for heat pump applications VI ANNUAL MAINTENANCE For best performance we recommend that you replace the Water Panel evaporator in your Aprilaire Humidifier annually with the exception of Model 400 which should be changed twice a season If you have a Humidifier Control equipped with a water panel timer the Change Water Panel light will be lit during operation on
4. float chamber for mineral build up Remove deposits as needed from floats float chamber and scale control insert Wash the parts with a disinfecting cleaner Reassemble the floats and float cover Make sure stems of both floats extend through openings in float cover and that floats move freely up and down 8 Slide a new Aprilaire no 45 water panel into the scale control insert float chamber Snap the distribution tray back on the scale control insert 9 Reinstall the water panel evaporator assembly into the humidifier Take care not to over bend the water level sensor assembly Push the top of the water panel evaporator assembly firmly back until it snaps into place 10 Push the end of the feed tube back firmly into the distribution tray Reset the damper to desired position Replace the front cover 11 Turn on the water supply 12 Check system operation Humidifier Control Automatic or Manual Check system operation and reset change water panel indicator by setting the knob to Test Reset With furnace blower operating and furnace calling for heat humidifier will operate for one minute DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE 13 Reset Humidifier Control to its original position Check operation 11 mr MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODEL 600 CAUTION Sudden operation may cause personal injury or property damage Turn Humidifier Control to off
5. further adjustment during SON future heating seasons Make note 2 5 gt of the dial setting in the event you temporarily move the knob when 4 performing annual maintenance of the Aprilaire Humidifier 3 2 1 AUTOMATIC MODE Your Aprilaire Automatic Humidifier is a high precision system that will accurately maintain the relative humidity in your home For every 1 change in outdoor temperature the control will automatically adjust the indoor relative humidity RH by 1 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 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 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
6. safeguard Condensation of water on inside windows in the form of fogging or frost is usually an indication of too much relative humidity 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 Your Aprilaire Humidifier Control FIGURE B is a precision instrument that can be used to determine the RH ao 45 accurately in your home during g ike the winter SSK Korg a GR To do this follow these steps a 1 Activate the furnace blower by E 2 setting your thermostat to a 97 higher temperature To g 2 the control dial setting to 15 the Off position Then slowly MANUAL MODE 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 read the RH on the dial This will be very close to the actual RH in your home See Figure B To check the humidifier operation set the knob to Test Reset make sure that the water saddle valve is open and that there is electricity to the unit The furnace blower motor must be operating and the furnace calling for heat for the Aprilaire Humidifier to function Note Turning the knob to Test Reset resets the Change Water Panel internal timer After the humidifier has ope
7. 0 cu ft requires the addition of approximately 9 gallons of water per day to maintain 3590 relative humidity when the outside temperature is 20 The smallest Aprilaire Humidifier under most operating conditions has this humidifying capacity Trouble free performance and minimum maintenance are assured by the design features of the Aprilaire Humidifier All unit housing parts that come in contact with water are non metal and will never rust or corrode Neither heat nor water will affect them under normal operating conditions The Water Panel evaporator designed especially for uniform high evaporation along with the Scale Control Insert efficiently traps mineral deposits which are often the cause of damage to working parts in ordinary humidifiers No white dust can be distributed throughout the living quarters The Water Panel evaporator is the heart of the unit and must be in good condition to assure high capacity trouble free performance It should be changed once a year with the exception of the Model 400 where it should be changed twice a heating season The granular coating in the bottom of the distribution tray is designed to provide equal distribution of water to each of the openings assuring an even flow over the Water Panel evaporator Do not clean the mineral scale off the bottom of the water distribution tray at the end of the humidification season The scale itself provides an excellent track for the water to follow This is
8. 1 am uring the coldest portion of the first heating season minor adjustments may be necessary This is dependent upon your homes 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 I increment Lack of humidity Increase the setting on the control dial by 1 increment Humidifier does not operate Turn dial to Test Reset Make certain furnace is operating in heat mode If unit still doesn t operate consult a heating contractor Humidifier won t shut off Turn dial to Off If unit continues to operate consult a heating contractor Test mode System operation is checked by setting the knob to Test Reset Make certain furnace blower is operating and furnace is calling for heat Humidifier will operate for one minute Be sure to turn the control knob back to the normal setting after checking humidifier operation Reset water panel change Turn the control knob to the indicator Test Reset position until the Change Water Panel light blinks to reset the water panel change indicator timer Blower must be operating and furnace calling for heat Be sure to turn the control knob back to the normal setting after resetting the timer The relative humidity in your home FIGURE A will now be accurately controlled to meet your needs and should not 6 7 need
9. ATION Please Take a few minutes to visit us on line at www aprilaire com to register your Aprilaire product If you do not have on line access please mail a postcard with your name address phone number product purchased and date of purchase to Research Products Corporation P O BOX 1828 Madison WI 53701 Thank you Your Warranty Registration information will not be sold or shared outside of this company Ger RESEARCH PRODUCTS corporation P O BOX 1467 MADISON WI 53701 1467 DP 10005406 25 10 03 Printed in U S A
10. RANTY IS VOID DUE TO FAILURE TO USE A QUALIFIED CONTRACTOR ALL DISCLAIMERS OF IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION Some states do not allow limitations on how long an implied warranty lasts or the exclusion or limitation of incidental or consequential damages so the above exclusion or limitations may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state rilaire The Aprilaire Indoor Air Comfort System is an integrated group of air quality enhancement products designed to work with your heating and cooling system to make your home more comfortable For the best in indoor air quality ask your heating and cooling contractor about these fine Aprilaire products or visit us at www aprilaire com to solve your Indoor Air Comfort needs Aprilaire Aprilaire Automatic Humidifiers High Efficiency Air Cleaners Pt RB Aprilaire Zone Control Systems i Ea Aprilaire Aprilaire Energy Recovery Ventilator Electronic Thermostats The following are registered trademarks reserved by Research Products Corporation The Best in Indoor Air Comfort The Best Cure For Dryness Nobody Makes Clean Air Easier Custom Comfort Throughout Your Home Only The Freshest Homes Have April Air Energy Efficiency Never Looked So Good 16 SERVICE AND WATER PANEL REPLACEMENT RECORD Date Dealer Name WARRANTY REGISTR
11. actually what we try to simulate with the synthetic coating in the bottom of the tray If the coating is removed it is not necessary to purchase a new distribution tray You can accomplish the same uniform performance by applying a small amount of liquid dishwashing detergent over the entire inside surface of the water distribution tray This will allow the water to flow evenly through each of the openings provided of course the unit is level in order to achieve maximum capacity There are many humidifiers on the market They all add moisture with varying degrees of efficiency None however can provide the features design and performance incorporated into your Aprilaire Humidifier II OPERATING INSTRUCTIONS 400 600 amp 700 There are 2 possible modes of operation of your Aprilaire Humidifier Control Automatic and Manual An explanation of both modes follows Automatic Mode Manual Mode see pg 6 Your Aprilaire Humidifier Control is installed in the cold air return duct During the first heating season your 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
12. e 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 uniformly distributed across the width of the tray and through a scientifically designed system of outlets It flows by gravity over the Water Panel evaporator the heart of the unit Dry hot air is moved through the moisture laden Water Panel evaporator where the evaporation takes place The now humidified air carrying moisture in vapor form nature s own way is circulated throughout the home The correct water flow is determined by an orifice equipped with each drain type unit When the unit is operating there will be a small steady stream of water to drain which flushes away most of the trouble causing minerals Do not use the saddle valve to regulate the water flow It is designed to be completely opened or closed The minerals and solid residue not trapped by the replaceable Water Panel evaporator are flushed down the drain In the Models 550 600 and 700 The drain also eliminates the problems caused by stagnant water This is the most effective and least expensive method to dispose of trouble causing minerals There are some homes where drain facilities are not accessible or available For these situations or where high water hardness is not a problem the newest Aprilaire Model 400 is designed to satisfy these applications Capacity is high because an average size home 10 00
13. embly 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 beveled tabs that will hold it in place Push the end of the feed tube back firmly into the distribution tray and replace the front cover 8 Remove the drain hose 9 from the bottom of the unit and bend and flex it to loosen the internal calcium deposits Then flush it with water under pressure and slip it back onto the drain fitting 9 Turn on the water supply 10 Check system operation Humidifier Control Automatic or Manual Check system operation and reset change water panel indicator by setting the knob to Test Reset With furnace blower operating and furnace calling for heat humidifier will operate for one minute DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE 11 Set Humidifier Control to its original position 12 MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODEL 700 WARNING 120 volts may cause serious injury from electrical shock Disconnect power and shut off water supply before servicing ge 1 Front C Front Lover 2 Base G gt D 2 3 Water Panel r Evaporator 1 6 Assembly N ke FINI 4 Distribution Tray 5 Notches 6 Water Panel 7 Scale Control Insert 8 Drain Hose 9 Power Cord OM 8 OE w 1 Note Humidifier Control setting and turn dial to the OFF position 2 Disconnect electr
14. esearch Products Corporation 2003 INTRODUCTION Thank you for your recent Aprilaire Humidifier purchase We sincerely appreciate your business and are pleased to add your name to our growing list of customers With this purchase you have invested in the highest quality equipment currently available Research Products Corporation is the largest manufacturer of whole house humidifiers air cleaners and fresh air exchangers and is a recognized leader in the heating and air conditioning industry today Please be assured that in addition to product quality we are also committed to unit performance as well as customer satisfaction Your unit will require periodic maintenance to assure you of continued fine performance Please proceed as shown on page 9 to obtain service parts and or replacement Water Panel evaporators Now please take a few minutes and read the appropriate section of this booklet This will familiarize you with the benefits you will receive from the equipment you just purchased and help you understand the routine maintenance that will be required Be sure to register your Humidifier with us for our records and your protection You may do so by returning a Warranty Information Card to us or you can register online at www aprilaire com warranty Genuine Replacement Water Panel evaporators are available from your installing contractor or from most other heating and air conditioning contractors in your area However if you
15. ical 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 water panel evaporator assembly 3 by grasping at the top and tipping out 5 Remove the distribution tray 4 from the water panel evaporator assembly 3 by unsnapping the plastic holding strips from the tabs at the end of the tray Lightly scrape out any calcium deposits and clean the V notches 5 but do not scrape off the granular coating from the bottom This textured surface helps ensure even water flow for maximum performance 6 Slide the Water Panel evaporator 6 out from the Scale Control Insert 7 Clean the Scale Control Insert by twisting and flexing it to loosen the calcium deposits or use a putty knife Inspect the Water Panel evaporator Stock No 35 and replace with a new Genuine Aprilaire Water Panel if necessary Slide the Water Panel evaporator back into the scale control insert with the colored spot up and snap the distribution tray 4 back into place 7 Re install the water panel evaporator assembly 3 into the base assembly 2 Push it 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 calcium deposits Then flush it with water under pressure and slip it back onto the drain fitting 9 Reinstall cover
16. ly when it is time to change your Water Panel To purchase a new Water Panel Call the installer of your Aprilaire Humidifier This information is often found on your equipment e Call your heating and air conditioning dealer e Use our Dealer Locator at www aprilaire com e Look in the Yellow Pages under Humidifying Apparatus or Heating amp Air Conditioner Contractors If none of the above is successful and you still need information please feel free to write us e Purchase only Genuine Aprilaire Water Panels to maintain performance After replacing the Water Panel turn the control knob to the Test Reset position until the Change Water Panel light blinks to reset the water panel change indicator timer Blower must be operating and furnace calling for heat Be sure to turn the control knob back to the normal setting after resetting the timer Vil ANNUAL SUMMER SHUTDOWN 1 For Models 400 and 600 close the bypass damper which is a part of the unit with the use of the small damper handle For the Model 550 close the bypass damper which is installed in the bypass pipe 2 Shut off the water supply to the humidifier by closing the saddle valve Humidifier Control There is no adjustment to the Humidifier Control required for summer shutdown Applies to both Automatic and Manual Mode Vill PERIODIC PREVENTATIVE MAINTENANCE NOTE Periodic inspection and preventive maintenance of your total heating sys
17. om the tabs at the end of the tray Lightly scrape any calcium deposits out of the V notches 6 but do not scrape the granular coating from the bottom of the tray This textured surface helps ensure even water flow for maximum performance If the granular coating has been removed place several drops of liquid dish soap on the distribution tray and clean thoroughly This will only need to be done once 5 Slide the Water Panel evaporator 7 out from the Scale Control Insert 8 Clean the insert frame by twisting and flexing it to loosen the calcium deposits or use a putty knife Inspect the Water Panel evaporator Stock No 10 for Model 550 and substitute a new one if necessary Slide the pad back into the insert frame with color mark up and snap the distributor tray back into place 6 Re install the Water Panel evaporative 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 beveled tabs that will hold it in place Push the end of the feed tube back firmly into the nozzle and replace the front cover 7 Remove the drain hose 9 from the bottom of the unit and bend and flex it to loosen the internal calcium deposits Then flush it with water under pressure and slip it back onto the drain fitting 8 Turn up Humidistat and check unit operation 14 LIMITED WARRANTY Your Research Products Corporation Aprilaire Humidifier unit is expressly wa
18. outside of the listed values in Table 2 In these cases you can only approximate your home s actual indoor RH TABLE 2 Relative Humidity Guide Outdoor Temperature F 10 0 10 20 30 40 Dial Setting 30 35 40 45 45 45 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 Manual Mode Automatic Mode see pg 4 Your Aprilaire Humidifier Control is installed 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 the correct setting will be 35 relative humidity If the temperature is expected to fall to 0 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 and experience see Table 3 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 and to avoid condensation on your windows For example a wintertime indoor RH of 50 may be considered ideal but unfortunately it probably would result in damage to your home Observance of the recommended RH levels on your Humidifier Control therefore is an important
19. rated for one minute and water is entering the unit and coming out at the drain reduce the humidistat setting to the recommended inside relative humidity depending on the outside temperature DO NOT LEAVE IN TEST MODE AS HUMIDIFIER WILL NOT OPERATE Follow the suggested settings prior to a drop in the outside temperature 11 OPERATING INSTRUCTIONS 550 Your new Aprilaire Humidifier is controlled by a manual humidistat installed either in the living area or in the cold air return It is important to anticipate a drop in temperature and reduce the setting accordingly to avoid excessive condensation For example with an outside temperature of 20 the correct setting will be 3590 relative humidity If the temperature is expected to fall to 0 that evening then merely reduce the setting to 2590 several hours prior to the temperature change IV ADDITIONAL INFORMATION FOR ALL MODLES Be sure to keep fireplace dampers closed when not in use They provide an excellent escape route for heat as well as humidity 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 Aprilaire 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 potential damaging
20. rilaire Automatic Humidifiers Owner s Manual For Models 400 550 600 amp 700 Includes Safety amp Operating Instructions and Warranty Information TABLE OF CONTENTS E E RS pte ered 1 Principle or OperatiOn eek sd ane Shae OSS ELEN dat 2 Operating Instructions Model 400 600 amp 700 Automatic Moder un Shei sked ia resa 4 Manual Mode 7 oats ooo er NSI each eda tow mine eee det 6 Operating Instructions Model 550 8 Effect of Water Characteristics 8 Annual Maintenance 0 000 0000 A eee 9 Annual Summer Shutdown 9 Periodic Preventative Maintenance 9 MAINTENANCE INSTRUCTIONS LAD GES kulen dets 11 GOO k er bent ap ad 12 Model 0 Scie en 13 MODEL S50 rg tros dewine le ce Rest a ere 14 LIMITED Warranty nere Ten ren 15 Replacement RECON ster Kress sat wenn 17 WARNING 120 volts may cause injury from electrical shock Disconnect power and shut off water supply before servicing CAUTION Sudden operation may cause personal injury or property damage Turn the Aprilaire Humidifier Control to OFF or lowest setting before servicing R
21. rranted for one 1 year from date of installation to be free from defects except however for the disposable Water Panel which will have to be replaced from time to time depending upon the amount of use Research Products Corporation s exclusive obligation under this warranty shall be to supply without charge a replacement for any part of the humidifier which is found to be defective within one 1 year period and which is returned not later than thirty 30 days after said one 1 year period by you to either your original supplier or to Research Products Corporation Madison Wisconsin 53701 together with the model number manufacturing code number and installation date of the humidifier THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE HUMIDIFIER ITSELF IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID ONE YEAR PERIOD RESEARCH PRODUCTS CORPORATION S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES OTHER THAN DAMAGES FOR PERSONAL INJURIES RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE LIMITED WARRANTY IS EXPRESSLY EXCLUDED THIS LIMITED WARRANTY IS VOID IF DEFECT S RESULT FROM FAILURE TO HAVE THIS UNIT INSTALLED BY A QUALIFIED HEATING AND AIR CONDITIONING CONTRACTOR IF THE LIMITED WAR
22. still have difficulty in obtaining a replacement Water Panel evaporator use the dealer locator in our web site www aprilaire com or look in the Yellow Pages under Humidifying Apparatus or Heating amp Air Conditioning Contractors Purchase only genuine Aprilaire Water Panels to maintain performance I PRINCIPLE OF OPERATION With your purchase of a humidification system you have invested in a humidifier that operates on the evaporative principle nature s own way of adding moisture and will provide the proper relative humidity all during the heating season It is very possible that you have questions concerning your new humidifier questions on what it can do for you and what you should do to receive maximum benefits from it This booklet is intended to help you do exactly that Nature in producing an invigorating comfortable April day combines just the right temperature and the right amount of moisture Aprilaire Humidifiers employ the same principle with refinements to give you the proper relative humidity for maximum allowable comfort all winter long The important considerations in the evaluation of a humidifier are Positive Control Sufficient Capacity Trouble free Performance and Minimum Maintenance The operating principle of your Aprilaire provides all of these advantages Here briefly is the method The Aprilaire Humidifier is installed to operate in conjunction with the furnace blower motor When the Aprilair
23. tem is important for efficient and safe operation Your heating contractor should include 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 N COMERESSION water supply NUT 2 Disconnect the water line at the inlet compression nut N oririce H 3 Remove the in line strainer from inside the inlet side of v rek the valve by using a small me SE nail or wire me 4 Flush the in line strainer clean replace with new IN LINE A STRAINER strainer Service Department INLET Part No 4004 COMPRESSION NUT 5 Replace the in line strainer a 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 and reconnect electrical power to the furnace 10 MAINTENANCE INSTRUCTIONS for APRILAIRE HUMIDIFIER MODEL 400 CAUTION Sudden operation may cause personal injury or property damage Turn Humidifier Control to off or lowest setting before ser
24. vicing 1 Front Cover 2 Feed Tube 3 Integral Damper a 4 Water Panel Evaporator Assembly 5 Distribution Tray 6 V Notches F 7 Water Panel 8 Scale Control Insert Float Chamber 9 Overflow Hose 10 Float Cover 11 Float MODEL 400 12 Water Level Sensor Assembly 1 Note Humidifier Control setting and turn dial to the Off position 2 Turn off water supply Turn the damper 3 to the SUMMER position 3 Press the tabs in the latches on the top and bottom of front cover 1 and pull cover off base with both hands 4 Carefully pull the plastic feed tube 2 out of the distribution tray 5 at the top of the Water Panel evaporator assembly 4 Tip the Water Panel evaporator assembly forward and lift it out of the humidifier Do not tip the Water Panel evaporator assembly more than needed to clear the housing to avoid over bending the water level sensor assembly 12 5 Unsnap the distribution tray from the scale control insert 8 Lightly scrape out any calcium deposits and clean the V notches 6 but do not scrape off the granular coating This textured surface helps ensure even water flow for maximum performance See page 3 if removed 6 Slide the used water panel 7 out of the scale control insert float chamber and dispose of the water panel Inspect the overflow hose 9 to make sure it is open 7 Remove the float cover 10 and inspect the floats 11 and
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