Aprilaire Humidifiers Owner’s Manual

Aprilaire Humidifiers

Product Information

Specifications:

• Models: 350, 360, 400A, 500A, 500M, 600A, 600M, 700A & 700M
• Power: 120 volts
• Operating Principle: Drain-type humidifier
• Control: Automatic Digital Humidifier Control

Product Usage Instructions

• Principle of Operation:
  The Aprilaire humidifiers aim to provide the optimum Relative Humidity (RH) for maximum comfort during the winter months. The correct water flow is determined by an orifice in each drain type humidifier, ensuring precise control and trouble-free performance.

• Water Flow Regulation:
  Do not use the saddle valve to regulate water flow. It should be either completely open or closed. The water panel evaporator flushes away minerals and residue, maintaining efficient operation.

• Drain Facilities:
  If drain facilities are not accessible or if high water hardness is a concern, Model 400A is designed to address these situations effectively.

• Maintenance:
  All humidifier housing components that come in contact with water are non- metal and resistant to rust. Mineral deposits may form in the distribution tray but can aid in water distribution.

• Automatic Digital Humidifier Control:
  The control unit works with the furnace to adjust the operation of the humidifier based on indoor RH and outdoor temperature, ensuring optimal humidity levels in the home.

FAQ

• Q: How do I adjust the humidity level with the Automatic Digital Humidifier Control?
  A: The control unit automatically adjusts the operation of the humidifier based on indoor RH and outdoor temperature. You can set your desired humidity level on the control panel.

• Q: What should I do if mineral deposits block the distribution tray openings?
  A: If mineral deposits block the tray openings, they should be removed as part of the Periodic Preventative Maintenance outlined in the manual to ensure proper water distribution.

WARNING
120 volts may cause injury from electrical shock. Disconnect power and shut off the water supply before servicing.

CAUTION
Sudden operation may cause personal injury or property damage. Turn the Aprilaire Humidifier Control to “OFF” or the lowest setting before servicing.

INTRODUCTION

Thank you for your recent Aprilaire® humidifier purchase. We appreciate

your business and are pleased to add your name to our growing list of customers. You have invested in the highest quality equipment available. Aprilaire manufactures whole-house indoor air quality products and is a recognized leader in the heating and air conditioning industry. Your humidifier will require periodic maintenance to ensure continued fine performance. See to obtain service parts and/or replacement Water Panel® evaporators. Now, please take a few minutes and read 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 warranty online at: www.aprilaire.com/warranty.

Genuine Aprilaire Replacement Water Panel® evaporators are available from your installing contractor or most other heating and air conditioning contractors in your area. Use the dealer locator on our website (www.aprilaire.com) or look under Humidifying Apparatus or Heating & Air Conditioning Contractors. Purchase only genuine Aprilaire Water Panels to maintain peak performance.

PRINCIPLE OF OPERATION

With your purchase of this humidification system, you have invested in a humidifier that operates on the evaporative principle – nature’s way of adding moisture – providing optimum relative humidity (RH) throughout the heating season. You may 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 answer these questions. 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 optimum RH for maximum allowable comfort all winter long. The important considerations in the evaluation of a humidifier are precise control, sufficient capacity, trouble- free performance, and minimum maintenance. The operating principle of your Aprilaire humidifier provides all of these advantages.

Here, briefly, is the method:
Except for Models 350 and 360, the Aprilaire humidifier is installed to operate in conjunction with the furnace blower motor. When the Aprilaire humidifier Control calls for humidity and the blower motor is operating, water flows to the distribution tray located at the top of the humidifier. 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 humidifier. Dry, hot air is moved through the moisture-laden Water Panel evaporator where natural evaporation takes place. The now-humidified air carrying moisture in vapor form (nature’s way) is circulated throughout the home. Models 350 and 360 use service hot water (140°F maximum) for a heat source, as heat is needed for evaporation. While the water going to the humidifier is hot, the flushing water to the drain will be cold. The heat is extracted during the evaporation process.

The correct water flow is determined by an orifice provided with each drain- type humidifier. When the humidifier 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 open or closed. The minerals and solid residue not trapped by the replaceable Water Panel evaporator are flushed down the drain in Models 350, 360, 500A, 500M, 600A, 600M, 700A, and 700M. This is the most effective and least expensive method to dispose of trouble-causing minerals. The drain also eliminates the problems caused by stagnant water.

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 Model 400A is designed to satisfy these applications. Trouble-free performance and minimum maintenance are assured by the design features of the Aprilaire humidifier. All humidifier 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, and the Scale Control Insert (which encases the Water Panel) efficiently traps mineral deposits which are often the cause of damage to working parts in ordinary humidifiers. When properly maintained, no “white dust” will be distributed through the living quarters. The Water Panel evaporator is the heart of the humidifier and must be in good condition to ensure high capacity and trouble-free performance. should be changed at least annually except for the Model 400A which should be changed twice per heating season.

The distribution tray incorporates a synthetic fabric liner that is designed to deliver water uniformly over the entire top surface of the Water Panel evaporator, provided the humidifier is mounted level. It is normal for some mineral deposits to form in the distribution tray as it dries out between humidification cycles. These deposits can help distribute water in the tray, but if they block the openings, they should be removed as described in the “Periodic Preventative Maintenance” section of this manual. Your Automatic Digital Humidifier Control works in conjunction with your furnace to control the operation of the humidifier. The control senses indoor RH and outdoor temperature and automatically adjusts the operation time of the humidifier to provide the optimum humidity level in the home.

The digital readout on the automatic control displays the RH level inside the cold air return duct. RH is a measure of the amount of moisture in the air as a percentage of what the air can hold. Warm air can hold more moisture than cold air can. This reading will accurately indicate the RH in the living space when the furnace blower is operating. Once the furnace blower stops, the readout will not change. The control has lights that indicate humidifier operation, when the water panel needs to be replaced, and when service is required. See “Operating Instructions” for more information. There are many humidifiers on the market. They all add moisture… with varying degrees of efficiency. None, however, offer the features, design, and performance incorporated into your new Aprilaire humidifier.

OPERATING INSTRUCTIONS

MODELS 400A, 500A, 600A & 700A
The Automatic Digital Humidifier Control offers two modes of operation, Automatic or Manual. An explanation of both modes follows. (See Figure A for Automatic Mode. See Figure B for Manual Mode.)

When in the Automatic Mode, this system offers the following benefits:

• Automatically adjusts your home’s RH based on the outdoor temperature. You will always receive the optimum amount of humidity, during the heating season.
• Eliminates the need to manually adjust the control when outdoor temperature changes.
• Precisely controls the RH in your home, and increases the time maximum comfort is maintained. Your home and its furnishings are always protected from the damaging effects of excess condensation or low humidity, during the heating season.
• Eliminates the need to turn the dial setting to “Off” during the summer season. Simple operation with a few adjustments.

AUTOMATIC DIGITAL HUMIDIFIER CONTROL INDICATOR LIGHTS

• Call Dealer for Service: The red light indicates that the humidifier is not operating normally and that service is required.
• Change Water Panel: The yellow light indicates that it is time to change the Water Panel in the humidifier.
• Humidifier On: The green light indicates that the humidifier is operating normally.

FIGURE A – Automatic Mode

AUTOMATIC MODE
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 comfort and home’s requirements. Refer to TABLE 1 – Operation Guide.
2. During the coldest portion of the first heating season, minor adjustments may be necessary. This is dependent upon your home’s construction. Refer to TABLE 1 – Operation Guide.

The RH 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 to “OFF” when performing the annual maintenance of your Aprilaire humidifier.

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.
The humidifier does not operate. (Solenoid does not “click” when control is moved to the “Test/Reset” position.)| Turn the dial to “Test/Reset”. Make certain the furnace blower is operating and the furnace is calling for heat. If the unit still does not operate, consult a heating contractor.
The humidifier won’t shut off.| Turn the dial to “Off”. If the unit continues to operate, consult a heating contractor.
Test mode.| System operation is checked by setting the knob to “Test/Reset”. Make certain the furnace blower is operating and the furnace is calling for heat. The humidifier will operate for one minute. NOTE: Placing the knob in “Test/Reset” resets the Water Panel change timer.
A red “Call Dealer for Service” light flashes ( Figure A ).| Note the error code on the display (E1, E2, or E3) and call your heating and air conditioning dealer.
Yellow “Change Water Panel” light flashes ( Figure A ).| Refer to the humidifier Owner’s Manual for instructions on changing the Water Panel or call your heating and air conditioning dealer for service. After the Water Panel is replaced, turn the Control knob to the “Test/Reset” position until the green “Humidifier On” light flashes, to reset the Water Panel change timer.

ADDITIONAL INFORMATION
Your humidifier is a precision system that will accurately maintain the RH in your home. For every 1°F change in outdoor temperature, the Automatic Digital Humidifier Control will automatically adjust the indoor RH by 1/2%.

The Automatic Digital Humidifier Control 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. Due to varying conditions in your home (cooking, showering, etc.), it is normal for the RH reading to vary slightly.

WATER PANEL CHANGE INDICATOR
The control keeps track of humidifier operation time. The yellow “Change Water Panel” light flashes once a typical amount of running time has elapsed. This running time is preset by the installer based on the humidifier model and water characteristics.

TEST/RESET
The Test/Reset feature allows the humidifier operation to be checked even if there is no call for humidity. See “Check the Humidifier Operation”.

MANUAL MODE

FIGURE B – Manual Mode

Your Automatic Digital Humidifier Control is installed in the cold air return. When installed in the Manual Mode (see Figure B), 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% RH. If the temperature is expected to fall to 0°F that evening, then merely reduce the setting to 25% several hours before the temperature change.

The recommended settings on the Humidifier Control are based on years of research (see Table 3) 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 the protection of your home and to avoid condensation on your windows. For example, a wintertime indoor RH of 50% may be considered ideal for comfort, but unfortunately, it probably would result in condensation, which can cause damage to your home. Observing the recommended RH levels on your Humidifier Control is an important safeguard. Condensation of water on the inside surface of windows in the form of fogging or frost is usually an indication of too much RH. This same condensation can take place in other areas in your home with the possibility of damage resulting.

TABLE 3 – Outdoor Temperature/Indoor Relative Humidity

Outside Temperature

+40°F

| Recommended RH ****

45%

---|---
+30°F| 40%
+20°F| 35%
+10°F| 30%
0°F| 25%
–10°F| 20%
–20°F| 15%

OPERATING INSTRUCTIONS – MODELS 350, 360, 500M, 600M & 700M

FIGURE C – Manual Humidifier Control

Your Aprilaire humidifier is controlled by a Manual Humidifier Control (see Figure C). The Manual Humidifier Control is installed either in the cold air return duct or on an interior wall of the home. It is important to anticipate a drop in outdoor temperature and reduce the setting accordingly to avoid excessive condensation, just as with the Automatic Digital Humidifier Control installed in Manual Mode. To determine the indoor RH, slowly turn the knob clockwise and counterclockwise and listen for 2 clicks. The indoor RH is within the range of the 2 clicks.

CHECK THE HUMIDIFIER OPERATION

AUTOMATIC DIGITAL HUMIDIFIER CONTROL
Set the knob to “Test/Reset”, and make sure that the water saddle valve is open and that there is electricity to the humidifier. The furnace blower motor must be operating and the furnace calls for heat for the humidifier to function. Note: Turning the knob to “Test/Reset” resets the “Change Water Panel” internal timer. In addition, in this setting, the humidifier will only operate for 1 minute. Reduce the Humidifier Control setting to the recommended inside RH, depending on the outside temperature. DO NOT LEAVE IT IN TEST MODE AS THE HUMIDIFIER WILL NOT OPERATE. Follow the suggested settings before a drop in the outside temperature.

MANUAL HUMIDIFIER CONTROL
Set the knob to the highest setting, make sure that the water saddle valve is open and that there is electricity to the humidifier. The furnace must be operating for the humidifier to function. Once water is entering the humidifier and coming out at the drain, reset the Humidifier Control to its original setting.

ADDITIONAL INFORMATION FOR ALL MODELS

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 RH 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 potentially damaging excess moisture levels.

EFFECT OF WATER CHARACTERISTICS

• Whether to use available tap water, even though it may be quite hard, or chemically softened water, is a common question homeowners have when their dealer is installing a humidifier. Your humidifier is designed to operate effectively using hot, cold, hard, or mechanically softened water. (Hot water is required for Models 350 and 360. Do not use hot water with Model 400A.)
• 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. In either case, the service life of a Water Panel evaporator will be virtually the same. The Water Panel evaporator should be changed once a year except the Model 400A 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.
• Hot supply water, 140°F maximum, is recommended with drain-type humidifiers for increasing capacity and is required for heat pump applications.

WARNING

RISK OF SCALDING
Water temperatures over 125˚F can cause severe burns and scald instantly. Shut off the hot water supply before disconnecting or tapping into any hot water supply line.

MAINTENANCE

ANNUAL MAINTENANCE
For best performance, we recommend that you replace the Water Panel evaporator in your Aprilaire humidifier at least annually except for Model 400A which should be changed twice per heating season. The “Change Water Panel” indicator light (Automatic Control only) will blink when it is time to change your Water Panel. See individual model instructions for additional maintenance.

To purchase a new Water Panel:

• Call the installer of your Aprilaire humidifier.
• This information is often found on your equipment.
• Call your heating and air conditioning dealer.
• Use our “Dealer Locator” at: www.aprilaire.com
• Look under Humidifying Apparatus or Heating & Air Conditioner Contractors.
• If none of the above is successful and you still need information, please feel free to write us.
• Purchase only Genuine Aprilaire Water Panels to maintain performance.

If your humidifier is equipped with an Automatic Humidifier Control with a Water Panel change indicator, after replacing the Water Panel, turn the control knob to the “Test/Reset” position until the “Humidifier On” light blinks to reset its timer. (The blower must be operating and the furnace calling for heat.) Be sure to turn the control knob back to its original setting. If the “Humidifier On” light continues to blink, your humidifier is in Test mode. DO NOT LEAVE THE HUMIDIFIER IN TEST MODE OR IT WILL NOT OPERATE.

ANNUAL SUMMER SHUTDOWN

1. For Models 400A, 500A, 500M, 600A, and 600M close the bypass damper, which is a part of the humidifier, with the use of the small damper handle.
2. Shut off the water supply to the humidifier by fully closing the saddle valve.

Humidifier Control:

• Automatic Digital Humidifier Control in Automatic Mode (see Figure A): No adjustment is necessary.
• Automatic Digital Humidifier Control in Manual Mode (see Figure B): Set the knob to the “OFF” position.
• Manual Humidifier Control (see Figure C): Set the knob to the “OFF” position.

DEALER INSTRUCTIONS FOR PREVENTATIVE MAINTENANCE

NOTE:
Annual inspection and preventative maintenance of your total heating system are important for efficient and safe operation. Call your Aprilaire dealer for humidifier service and maintenance inspection.

PERIODIC PREVENTATIVE MAINTENANCE

• NOTE: Periodic inspection and preventative maintenance of your total heating system is important for efficient and safe operation. Your heating contractor should include humidifier service at the same time.
• All models are equipped with a water delivery system that includes a water feed tube, in-line water strainer, and orifice as shown below. These parts should be inspected and/or cleaned periodically to ensure continued proper humidifier performance. Inspect more often if seeing “white dust”.

WATER LINE INSPECTION AND SERVICE INSTRUCTIONS

1. Disconnect electrical power to the furnace and shut off the water supply.
2. Disconnect the water line at the inlet compression nut.
3. Remove the in-line strainer from inside the inlet side of the valve by using a small nail or wire.
4. Flush the in-line strainer clean or replace it with a new strainer, Service Department, Part No. 4004.
5. Reconnect the inlet water line. Wrench to Prevent Leaking.
6. Disconnect the water feed tube at the outlet compression nut.
7. Inspect the water feed tube by gently flexing it and looking for cracks or signs of wear. Replace the tube if it is cracked, brittle, or has been damaged.
8. Remove the orifice from the copper or plastic water feed tube and make sure this small opening is unplugged.
9. Replace the orifice and reconnect the water feed tube. Double Wrench to Prevent Leaking.
10. Remove the drain line from the bottom of the humidifier. If applicable, flex it to loosen any mineral deposits or blockages. Flush the drain line with water under pressure to clear it of any debris, and slip it back onto the drain fitting. If the drain line does not clean properly, replace it. Inspect the drain line to make sure it has a constant downward slope and is not flattened or blocked.
11. Turn on the water supply and reconnect electrical power to the furnace.

REQUIRED MAINTENANCE INSTRUCTIONS

(APRILAIRE HUMIDIFIER MODELS 350 & 360)

WARNING
120 volts may cause serious injury from electrical shock. Disconnect power and shut off the water supply before servicing.

1. Inlet Grille
2. Distribution Tray
3. Scale Control Insert
4. Distribution Tray Cover
5. Water Panel Evaporator
6. Drain Spud
7. Power Cord
8. Metal Housing
9. Water Panel Evaporative Assembly

1. Note the Manual Humidifier Control setting and turn the dial to the “OFF” position.
2. Disconnect electrical power and turn off the water supply.
3. Remove screws of the inlet grille (1). The grille can now be removed from the metal housing (8).
4. Lift the Water Panel evaporative assembly (9) out of the humidifier housing (8).
5. To remove the distribution tray (2) from the Water Panel evaporative assembly (9), push down on the tray and pull out the scale control insert (3). To clean the “V” openings of the tray, it will be necessary to gently pry the distribution tray cover (4) from the tray. Lightly scrape out or brush off any mineral deposits, being careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar or a lime-removing agent is helpful when trying to remove stubborn mineral deposits.
6. Slide the Water Panel evaporator (5) out from the scale control insert (3). Clean the scale control insert of mineral deposits. Replace the Water Panel evaporator (Stock No. 35) with a Genuine Aprilaire Water Panel. Slide the Water Panel back into the scale control insert (3) and snap the distribution tray cover (4) into the distribution tray (2). Then snap the distribution tray back into the scale control insert.
7. Inspect the plastic feed tube by gently flexing it and looking for cracks or signs of wear. Replace the tube if it is cracked, brittle, or has been damaged.
8. Remove the drain line from the bottom of the humidifier and flex it to loosen any mineral deposits or blockage. Then flush it with water under pressure. If it does not properly clear, replace it. Slip the drain line back onto the drain fitting (6). Make sure the drain line has a constant downward slope and is not flattened or blocked.
9. Reinstall the Water Panel evaporative assembly (9) and intake grille (1).
10. Reconnect electrical power (7) and turn on the water supply.
11. Turn up Manual Humidifier Control and check system operation.
12. Set the Manual Humidifier Control to its original position.

APRILAIRE HUMIDIFIER MODEL 400A

CAUTION
Sudden operation may cause personal injury or property damage. Turn the Humidifier Control to “OFF” or the lowest setting before servicing.

1. Front Cover

2. Feed Tube

3. Integral Bypass Damper

4. Water Panel Evaporative Assembly

5. Distribution Tray

6. “V” Notches

7. Water Panel Evaporator

8. Scale Control Insert/Float Chamber

9. Overflow Drain Line

10. Float Cover

11. Float

12. Water Level Sensor Assembly

13. Note the Humidifier Control setting and turn the dial to the “OFF” position.

14. Turn off the water supply. Turn the integral bypass damper (3) to the “SUMMER” position.

15. Press the tabs in the latches on the top and bottom of the front cover (1) and pull the cover off the base with both hands.

16. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water Panel evaporative assembly (4). Tip the Water Panel evaporative assembly forward and lift it out of the humidifier. Do not tip the Water Panel evaporative assembly more than needed to clear the housing to avoid over-bending the water level sensor assembly (12).

17. Unsnap the distribution tray (5) from the scale control insert (8). Lightly scrape out or brush off any mineral deposits, being careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar or a lime-removing agent is helpful when trying to remove stubborn mineral deposits.

18. Slide the used Water Panel evaporator (7) out of the scale control insert/float chamber and dispose of the Water Panel.

19. Remove the float cover (10) and inspect the floats (11) and 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 the stems of both floats extend through openings in the float cover and that floats move freely up and down.

20. Inspect the plastic feed tube (2) by gently flexing it and looking for cracks or signs of wear. Replace the tube if it is cracked, brittle, or has been damaged.

21. Slide a new Aprilaire No. 45 Water Panel evaporator (7) into the scale control insert/float chamber (8). Snap the distribution tray (5) back on the scale control insert (8).

22. Reinstall the Water Panel evaporative assembly (4) into the humidifier. Take care not to overbend the water level sensor assembly. Push the top of the Water Panel evaporative assembly firmly back until it snaps into place.

23. Push the end of the feed tube back firmly into the distribution tray. Replace the front cover.

24. Under normal operation, the overflow drain line (9) will never have water in it. However, inspect it for mineral deposits and replace it if necessary. Make sure the drain line has a constant downward slope and is not flattened or blocked.

25. Turn on the water supply. Return the integral bypass damper to the appropriate position.

26. Check system operation:
    Automatic Digital Humidifier Control: (Automatic or Manual mode) Check system operation and reset Change the Water Panel indicator by setting the knob to “Test/Reset”. With the furnace blower operating and the furnace calling for heat, the humidifier will operate for one minute. DO NOT LEAVE IT IN TEST MODE AS THE HUMIDIFIER WILL NOT OPERATE.

27. Set the Humidifier Control to its original position.

APRILAIRE HUMIDIFIER MODELS 500A, 500M, 600A & 600M

CAUTION
Sudden operation may cause personal injury or property damage. Turn the Humidifier Control to “OFF” or the lowest setting before servicing.

1. Front Cover

2. Feed Tube

3. Integral Bypass Damper

4. Water Panel Evaporative Assembly

5. Distribution Tray

6. “V” Notches

7. Water Panel Evaporator

8. Scale Control Insert

9. Drain Line

10. Note the Humidifier Control setting and turn the dial to the “OFF” position.

11. Turn off the water supply. Turn the integral bypass damper (3) to the SUMMER position.

12. Press the tabs in the latches on the top and bottom of the front cover (1) and pull the cover off base with both hands. Set aside.

13. Carefully pull the plastic feed tube (2) out of the distribution tray (5) at the top of the Water Panel evaporative assembly (4). Pull this assembly out by grasping at the top and tipping it out.

14. Unsnap the distribution tray (5) from the scale control insert (8). Lightly scrape out or brush off any mineral deposits, being careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar or a lime-removing agent is helpful when trying to remove stubborn mineral deposits.

15. Slide the Water Panel evaporator (7) out from the scale control insert (8). Clean the scale control insert of mineral deposits. Replace the Water Panel evaporator (Stock No. 35 for Models 600A & 600M and Stock No. 10 for Models 500A & 500M) with a new Genuine Aprilaire Water Panel. Slide the Water Panel evaporator back into the scale control insert with the colored spot up and snap the distribution tray (5) back into place.

16. Inspect the plastic feed tube (2) by gently flexing it and looking for cracks or signs of wear. Replace the tube if it is cracked, brittle, or has been damaged.

17. Reinstall the Water Panel evaporative assembly (4) into the humidifier by fitting its drain into the round receptacle at the base of the humidifier. Push the assembly in at the top until it snaps into place. Push the end of the feed tube back firmly into the distribution tray and replace the front cover.

18. Remove the drain line (9) from the bottom of the humidifier. If applicable, flex it to loosen any mineral deposits or blockage. Then flush it with water under pressure. If it does not properly clear, replace it. Slip the drain line back onto the drain fitting. Make sure the drain line has a constant downward slope and is not flattened or blocked.

19. Turn on the water supply. Return the integral bypass damper to the appropriate position.

20. Check system operation:

    • Manual Humidifier Control (Models 500M & 600M): With the furnace blower operating, turn up the Humidifier Control and check system operation.
    • Automatic Digital Humidifier Control (Models 500A & 600A): (Automatic or Manual mode) Check system operation and reset Change the Water Panel indicator by setting the knob to “Test/Reset”. With the furnace blower operating and the furnace calling for heat, the humidifier will operate for one minute. DO NOT LEAVE IT IN TEST MODE AS THE HUMIDIFIER WILL NOT OPERATE.

21. Set the Humidifier Control to its original position.

APRILAIRE HUMIDIFIER MODELS 700A & 700M

WARNING
ELECTRICAL SHOCK HAZARD. Can cause injury or death. Disconnect all electrical power supplies before servicing. Shut off the water supply before disconnecting or tapping into any water supply line.

1. Humidifier Cover Assembly

2. Base Assembly

3. Water Panel Evaporative Assembly

4. Distribution Tray

5. ”V” Notches

6. Water Panel Evaporator

7. Scale Control Insert

8. Drain Line

9. Power Cord

10. Note the Humidifier Control setting and turn the dial to the “OFF” position.

11. Disconnect electrical power and turn off the water supply.

12. Unlatch the humidifier front cover assembly (1) from the base assembly (2) at the bottom of the cover, lift it, and set it aside.

13. Pull out the Water Panel evaporative assembly (3) by grasping at the top and tipping out.

14. Unsnap the distribution tray (4) from the scale control insert (7). Lightly scrape out or brush off any mineral deposits, being careful not to stretch or loosen the synthetic fabric liner. Soaking the tray in vinegar or a lime-removing agent is helpful when trying to remove stubborn mineral deposits.

15. Slide the Water Panel evaporator (6) out from the scale control insert (7). Clean the scale control insert of mineral deposits. Replace the Water Panel evaporator (Stock No. 35) with a new Genuine Aprilaire Water Panel. 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.

16. Inspect the plastic feed tube by gently flexing it and looking for cracks or signs of wear. Replace the tube if it is cracked, brittle, or has been damaged.

17. Reinstall the Water Panel evaporative assembly (3) into the humidifier by fitting its drain into the round receptacle at the base of the humidifier. Push the assembly in at the top between the retaining ribs that hold the assembly in place in a vertical position.

18. Remove the drain line (8) from the bottom of the humidifier. If applicable, flex it to loosen any mineral deposits or blockage. Then flush it with water under pressure. If it does not clear, replace it. Slip drain line back onto the drain fitting. Make sure the drain line has a constant downward slope and is not flattened or blocked.

19. Reinstall the front cover assembly (1) by hooking at the top of the base assembly (2) and latching at the bottom.

20. Reconnect electrical power (9) and turn on the water supply.

21. Check system operation:

    • Manual Humidifier Control (Model 700M): With the furnace blower operating, turn up Humidifier Control and check system operation.
    • Automatic Digital Humidifier Control (Model 700A): (Automatic or Manual mode) Check system operation and reset Change Water Panel indicator by setting the knob to “Test/Reset”. With the furnace blower operating and the furnace calling for heat, the humidifier will operate for one minute. DO NOT LEAVE IT IN TEST MODE AS THE HUMIDIFIER WILL NOT OPERATE.

22. Set the Humidifier Control to its original position.

NOTE:
The motor is permanently lubricated and does not need to be oiled.

LIMITED WARRANTY

Your Research Products Corporation Aprilaire® humidifier unit is expressly warranted for five (5) years from the date of installation to be free from defects in materials or workmanship 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 such five-year period and which is returned not later than thirty (30) days after said five (5) year period by you to either your original supplier or to Research Products Corporation, Madison, Wisconsin 53701, together with the model 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 FIVE-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 WARRANTY 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.

WARRANTY REGISTRATION

• Visit us online at www.aprilaire.com to register your Aprilaire product.
• If you do not have online access, please mail a postcard with your name, address, phone number, product purchased, and date of installation to:
• Research Products Corporation, P.O. BOX 1467, Madison, WI 53701

Your Warranty Registration information will not be sold or shared outside of this company.

RESEARCH PRODUCTS CORPORATION PO BOX 1467 • MADISON, WI 53701-1467. ©2007 Research Products Corporation.

References

• AprilAire Home
• Repair Your Grill: Shop Replacement Parts for 24,880 Models
• Aprilaire Humidifier Parts - Select From 52 Models

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