Aprilaire Humidifier 558 User Manual

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, com-

bines 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 com-

fort 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 Aprilaire 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 uni-

formly distributed across the width of the tray and through a scien-

tifically 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 replace-

able Water Panel evaporator are flushed down the drain. 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.

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There are some homes where drain facilities are not accessible

or available. For these situations, or where high water

hardness is not a problem, specially designed Aprilaire

Humidifiers, Models 448 and 445, are available, incorporating a

water recirculating system.

Capacity is high because an average-size home (10,000 cu. ft.)

requires the addition of approximately 9 gallons of water

per day to maintain 35% relative humidity when the outside temper-

ature is 20°. The smallest Aprilaire Humidifier under most operating

conditions, has this humidifying capacity. Trouble-free perfor-

mance and minimum maintenance are assured by the design fea-

tures 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 con-

ditions.

The Water Panel evaporator, designed especially for uniform,

high evaporation, and the Scale Control Insert also 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 annually.

The granular coating in the bottom of the distribution tray is

designed to provide equal distribution of the water to each of the

openings assuring an even flow of water over the Water Panel evap-

orator. 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 actu-

ally 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 or upper housing. You can accomplish the

same uniform performance by applying a small amount of liquid dish-

washing detergent over the entire inside surface of the water distribu-

tion 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.

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II. OPERATING INSTRUCTIONS

There are 2 possible modes of operation of your Aprilaire Humidifier

Control and an explanation of both modes follows:

Automatic Mode:

(Manual Mode-see pg 5)

Your Aprilaire Humidifier Control is installed in the cold air return.

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 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

blower is operating and furnace is calling

for heat. If unit still doesn’t operate, consult

a heating contractor.

Humidifier won’t shut off

Test mode

Turn dial to “Off.”If unit continues to

operate, consult a heating contractor.

System operation is checked by setting the

knob to“Test.”Make certain furnace blower

is operating and furnace is calling for heat.

Humidifier will operate for one minute.

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(Figure A)

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 Aprilaire

Humidifier

7

6

5

4

Off

3

2

1

Humidity Level

Your Aprilaire Automatic Humidifier, is a high precision system

that will accurately maintain the relative humidity in your home.

For every 1º change in outdoor temperature, the control will

1

automatically adjust the indoor 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 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 outside of the listed values in Table 2. In these cases,

you can only approximate your home’s actual indoor RH.

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(Table 2) % Relative Humidity Guide

Outdoor Temperature (ºF)

-10

10

15

20

25

30

0

10

15

20

25

30

35

40

20

15

20

25

30

35

40

45

30

20

25

30

35

40

45

40

25

30

35

40

45

1

2

3

4

5

6

7

10

15

20

25

30

35

As an example, if the outdoor temperature is 20º 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 3)

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 exam-

ple, 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 humidistat 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 and to avoid condensation on your windows. For example, a

wintertime indoor RH of 50% may be considered ideal, but unfortu-

nately, 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 indica-

tion of too high relative humidities. This same condensation can

take place in other areas in your home with the possibility of dam-

age resulting.

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(Table 3) Outdoor-Indoor Relative Humidity

Outside Temperature

Recommended RH

+40°

+30°

+20°

+10°

0°

45%

40%

35%

30%

25%

20%

15%

–10°

–20°

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 you hear the solenoid valve

“click on”. At this point, read the

RH on the dial. This will be very

close to the actual RH in your

home. (See Figure B)

(Figure B)

MANUAL MODE

To check the humidifier operation, set the knob to “test”, make

sure that the water saddle valve is open and that there is electricity

to the unit. Generally, the furnace blower motor must be operating

for the Aprilaire Humidifier to function. After the humidifier has oper-

ated 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.

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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 Aprilaire

Humidifier is not operating. Telltale indications, again, are con-

densation 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

excess moisture levels.

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.

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, but in either

case, the Water Panel evaporator is usually changed once a year. In

the Model 448 Aprilaire Humidifier, these solids will build up on the

evaporator surface, in the reservoir and pump section. This is why

proper maintenance is important and necessary. Service hot water,

140° maximum, is recommended with drain type units for increas-

ing capacity and for heat pump applications.

In the drain-equipped models, most of these solids are effectively

controlled by flushing them down the drain.

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IV. ANNUAL MAINTENANCE

For best performance, we recommend that you replace the

water panel evaporator in your Aprilaire Humidifier annually.

• 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 in the Yellow Pages 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.

V. ANNUAL SUMMER SHUTDOWN

1. For Models 448, 558, 568, and 600 close the bypassdamper if

provided. The Model 600 damper is built into the unit and is

easily closed with the small damper handle.

2. Shut off the water supply to the humidifier by closing the sad-

dle valve.

Humidifier Control:

There is no adjustment to the Humidifier Control required for

summer shutdown. (Applies to both Automatic and Manual

Mode.)

VI. PERIODIC PREVENTATIVE MAINTENANCE

NOTE: Periodic inspection and preventive maintenance

of your total heating system is important for efficient and safe opera-

tion. 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 periodi-

cally to assure continued proper unit performance.

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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.

OUTLET

COMPRESSION

NUT

3. Remove the in-line strainer from inside

the inlet side of the valve by using a

small nail or wire.

ORIFICE

4. Flush the in-line strainer clean or

replace with a new strainer, Service

Department, Part No. 4004.

SOLENOID

VALVE

5. Replace the in-line strainer and

reconnect the inlet water line (Double

Wrench To Prevent Leaking).

INLET

IN-LINE

6. Disconnect the water line at the outlet

compression nut.

STRAINER

INLET

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.

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MAINTENANCE INSTRUCTIONS

for

APRILAIRE HUMIDIFIER MODEL 448

WARNING! 120 volts may cause serious injury from electrical shock. Disconnect

power and shut off water supply before servicing.

5

3

2

4

1. Cover Knob

2. Top Cover

1

3. Feed Nozzle

4. Distribution Tray

5. Metal Frame

1

MODEL

448

1. Note humidistat or control setting and turn dial to the “Off” position.

2. Disconnect electrical power and turn off water supply.

3. Remove two aluminum knobs (1), swing up and remove top cover (2) from

humidifier.

4. Place finger under white plastic water outlet (3) at top of black water distribu-

tion pan (4). Lift up to pop outlet loose from hole and notch in black distribution

pan.

5. Tip forward and lift the complete plastic framed evaporative section out of the

humidifier.

6. To remove black plastic water distribution pan from evaporative section, push

down on pan and out on white plastic frame (Scale Control Insert). Clean “V”

openings in water distribution panel but do not scrape coating off bottom

surface.

7. Remove Water Panel evaporator and Scale Control Insert. Remove Water Panel

evaporator from Insert and clean insert by flexing or using putty knife. Inspect

Water Panel evaporator and replace with a new Water Panel evaporator, if nec-

essary, with colored spot up.

8. Re-install black water distribution pan. Reinstall evaporative section in the

humidifier, with notch and hole in distribution pan toward you. Pop hose fitting

on end of feed tube into distribution pan.

9. See page 9 for reservoir and pump cleaning.

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MAINTENANCE INSTRUCTIONS

FOR MODELS 448

RESERVOIR PUMP SECTIONS

WARNING! 120 volts may cause serious injury from electrical shock. Disconnect

power and shut off water supply before servicing.

IMPORTANT: Clean and refill reservoir, hose, pump and float every 30 days during

heating season.

1. Pump Impellor Cap

2. Cap Sides

3. Impellor

4. Cap Flow Control

Opening

5. Float

6. Arm Mechanism

3

5

2

4

6

1

A. TO CLEAN RESERVOIR

1. Hold bottom of reservoir (IT IS FILLED WITH WATER) and loosen retainer

knob.Carefully lower reservoir, disengaging from metal frame.

2. Empty water, remove partition and reservoir liner.

3. Clean or replace reservoir liner. Reinstall partition in liner. To replace

reservoir, hook back of reservoir over lip of dark metal frame and tighten

knob.

B. TO CLEAN HOSE

1. Disconnect hose from pump and pull hose up through hole.

2. Flex hose to loosen scale and flush clean with a stream of water.

3. Clean nozzle at the same time.

C. TO CLEAN PUMP

1. Remove pump impellor cap (1) by pushing down on projecting sides (2).

2. Clean scale from inside of cover and impellor (3) with dull blade.

3. Clean flow control (4) in pump outlet with 5/32” bit.

4. Snap pump impellor cap (1) back in place.

5. Pull water hose down through hole, connect to pump, and attach nozzle into

water distribution pan.

D. TO CLEAN FLOAT

1. Clean scale off float (5) and arm mechanism (6) with dull blade.

2. Work arm mechanism (6) up and down to dislodge any scale buildup.

E. TO OIL MOTOR

1. Disconnect water line at valve inlet and swing line free. Disconnect the humidi-

stat leads.

2. Remove the three screws from the brown motor cover and remove.

3. Use two drops SAE 20 oil in the yellow hole on top and inside the yellow mark

on the side of the motor.

F. TO REASSEMBLE

1. Replace motor cover.

2. To reinstall reservoir, hook back of reservoir over lip of dark brown metal frame

and tighten knob.

3. Reconnect water at valve inlet.

4. To reinstall top cover, hook back under lip of dark brown metal frame and

tighten two knobs.

5. Reconnect humidistat or control leads and electrical power.

6. Turn on water supply and fill reservoir in the fall.

7. Check unit operation.

8. Check system operation:

Humidifier Control: Automatic Check system operation by setting the knob to

“Test.” With furnace blower operating and furnace calling for heat, humidifier

will operate for one minute.

9. Set humidistat or Control to its original position.

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MAINTENANCE INSTRUCTIONS

for

APRILAIRE HUMIDIFIER MODELS 558-568

CAUTION! Sudden operation may cause personal injury or property damage. Turn

humidistat or control to “off” or lowest setting before servicing.

5

3

6

4

1

8

7

1. Front Cover

2. Feed Tube

3. Nozzle

4. Water Panel Evapo-

rative Assembly

5. Distribution Tray

6. ”V” Notches

7. Water Panel

8. Scale Control Insert

9. Drain Hose

2

9

1. Note humidistat or 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 hold-

ing with both hands and set aside.

4. 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.

5. Remove the black plastic distribution tray (5) from the evaporative assembly

by unsnapping the white plastic holding strips from the tabs at the end of

the tray. 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 2 if removed.

6. Slide the Water Panel evaporator (7) out from the white plastic Scale

Control Insert (8). 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. 10 for Model 558 and Stock No. 35 for Model 568)

and replace with a new Genuine Aprilaire Water Panel if necessary. Slide

the Water Panel back into the Scale Control Insert with the black colored

spot up and snap the black distributor tray back into place.

7. Re-install the Water Panel evaporative assembly into the unit by fitting its

drain tube 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.

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 pres-

sure and slip it back onto the black drain fitting.

9. Turn on water supply.

10. Check system operation:

Humidifier Control: Automatic Check system operation by setting the

knob to “Test.” With furnace blower operating and furnace calling for

heat, humidifier will operate for one minute.

11. Set Humidifier Control to its original position.

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MAINTENANCE INSTRUCTIONS

for

APRILAIRE HUMIDIFIER MODEL 600

CAUTION! Sudden operation may cause personal injury or property damage.

Turn humidistat or control 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

10. Integral Damper

1. Note humidistat or 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 nozzle (3) at the top of the Water Panel

evaporative assembly (4). Pull this assembly out by grasping at top and tipping out.

5. Remove the black distribution tray (5) from the evaporative 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 2 if removed.

6. Slide the Water Panel evaporator (7) out from the white plastic Scale Control Insert (8).

Clean the insert frame of calcium deposits with a putty knife. Inspect Water Panel evap-

orator (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 black col-

ored spot up and snap the black distribution tray back into place.

7. Re-install the Water Panel evaporative assembly into the unit by fitting its drain tube

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.

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 by set-

ting the knob to “Test.” 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.

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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.

5

2

3

4

6

7

1

1. Front Cover

2. Base

3. Water Panel

4. Distribution Tray

5. ”V” Notches

6. Water Panel

7. Scale Control Insert

8. Drain Hose

9. Power Cord

8

9

1. Note humidistat or 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 evaporative assembly (3) by grasping at the top and tipping out.

5. Remove the black distribution tray (4) from the evaporative assembly (3) by unsnap-

ping the white 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 white plastic 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 red colored spot up and snap the

black distribution tray (4) back into place.

7. Re-install the evaporative assembly (3) into the base assembly (2). Push the evaporative

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 calcium 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.

11. Check system operation:

Humidifier Control: (Automatic or Manual) Check system operation by set-

ting the knob to “Test.” With furnace blower operating and furnace calling

for heat, humidifier will operate for one minute.

12. Set Humidifier or control to its original position

.

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LIMITED WARRANTY

®

Your Research Products Corporation Aprilaire Humidifier

unit is expressly warranted for one (1) year from date of instal-

lation 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 WAR-

RANTIES 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 inciden-

tal 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.

- 15 -

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®

THE BEST IN INDOOR AIR COMFORT

®

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

Automatic Humidifiers

High Efficiency Air Cleaners

®

The Best Cure For Dryness

Nobody Makes Clean Air Easier

The world’s first computer-equipped,

completely automatic humidifier.

Delivers the cleanest, healthiest air ever

available from a whole-house air cleaner.

®

Aprilaire

Zone Control Systems

®

Custom Comfort Throughout Your Home

The most reliable way to achieve temperature

control in every area of your home.

®

Aprilaire

Fresh Air Exchangers

Electronic Thermostats

Only The Freshest Homes

Energy Efficiency Never

™

Have April Air

Looked So Good

Your best value for a constant,

controlled supply of fresh air with

energy-recovery.

Ultra-thin, easy-to-use digital,

programmable, and communicating

controls featuring pinpoint accuracy.

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SERVICE AND WATER PANEL

REPLACEMENT RECORD

Date

Dealer Name

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P.O. BOX 1467 • MADISON, WI 53701-1467

™

Products For Better Indoor Air Quality

DP #10005406

Printed in U.S.A.

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