Aprilaire Humidifier 1952 User Manual

II. APPLICATION

Models 1952, 1953, and 1972 Aprilaire Ultraviolet Germicidal Lamps are designed for the treatment of evaporator coils used in

rooftop HVAC air handling units or in larger split systems used in the light commercial market. The UV germicidal light emitted from

the lamps will kill microorganisms growing on evaporator coils and drain pans and prevent further growth. The units use 120 -277

VAC / 60 Hz / single phase power, and are designed for continuous lamp operation.

External Mount Rooftop Units

Model 1952 24” Rooftop Unit

Model 1953 32” Rooftop Unit

The External Mount Rooftop Units incorporate a NEMA 4 enclosure for protection against the elements.

These units are intended primarily for installation on rooftop air handling units.

Internal Mount Rooftop Unit

Model 1972 Rooftop Unit, Internal Mount

The Internal Mount Rooftop Unit is intended primarily for rooftop applications in which it is preferred to mount the unit entirely within the

air handler rather than penetrating the outer cabinet. This unit is 18” in length and is mounted using supports supplied with the lamp.

III. INSTALLATION

NOTES FOR ALL MODELS

• The installation should be done by a licensed professional

trained in the installation and servicing of HVAC equipment.

Unit must be installed in accordance with all applicable

national and local codes.

APPROXIMATE COIL AREA COVERAGE FOR EACH MODEL

Model 1972

18” Lamp

Model 1952

24” Lamp

Model 1953

32” Lamp

Coil Area

(sq. in.)

(sq. ft.)

792

5.5

1008

7.0

1296

9.0

• Read all safety instructions at the beginning of this manual.

Failure to do so could lead to personal injury and/or

equipment damage.

GUIDELINES FOR THE NUMBER OF LAMPS REQUIRED

FOR A GIVEN COIL AREA

Coil Area

Model 1972

18” Lamp

Model 1952

24” Lamp

Model 1953

32” Lamp

• Read the installation manuals for the equipment on which

the lamps are being installed for additional information

and warnings.

(sq. in.)

(sq. ft.)

5.2

750

1000

1250

1500

1750

2000

2250

2500

2750

3000

3250

3500

1

2

3

4

5

1

2

3

4

1

2

3

6.9

8.7

• In cases where fungi and/or bacteria are already present on

the evaporator coil, it is recommended that a qualified HVAC

service technician clean the coil before the installation of the

UV Lamp. Because the Aprilaire Ultraviolet Germicidal Lamp

quickly kills fungi and bacteria, there could be an initial period

of temporarily increased levels of airborne decay products if

the coil is not cleaned before installation.

10.4

12.2

13.9

15.6

17.4

19.1

20.8

22.6

24.3

• The tools and equipment required to complete this installation

include: Drill, drill bits (3/32 in. & ‘Unibit’), holecutter (2 in.),

Phillips screwdriver, #10 nut driver, tape measure, sealant,

aluminum tape, multimeter with clamp-on ammeter, alcohol

& wipes, and safety glasses. Some installations may also

require weatherproof conduit and conduit connectors.

IMPORTANT NOTES: The above tables are guidelines only. The most

important requirement for an effective UV Lamp installation is complete

illumination of the coil and drain pan. Install UV Lamps as required to fully

illuminate the coil and drain pan.

The guidelines above are based on the following assumptions:

• UV Lamps to be installed 3 in. – 12 in. from coil

• Coil thickness in the range of 2 in. – 4 in.

• Shut off power to HVAC unit at the main disconnect

switch before starting installation.

3

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INSTALLATION OF EXTERNAL MOUNT ROOFTOP UNITS (MODELS 1952 & 1953)

FIGURE 1 – Model 1952/1953

Safety Interlock Switch

Ballast

Fuse

Lamp

Retaining

Bracket

Unit Base

Lamp Base

Lamp Socket

90-745

DETERMINE MOUNTING LOCATION

Determine a mounting location for the lamp. Use the criteria below to select a proper location:

a. The lamps are intended for evaporator coil treatment. See Figure 2 for typical installation. If a single Lamp cannot illuminate the

majority of the evaporator coil, two or more units might be required as shown. To the extent possible, the Lamp(s) should be centered

on the coil (or section thereof) being illuminated.

b. Install lamp in location that prevents exposure of

plastics, rubber, paper, and other non-metallic

materials to UV light, or shield such materials with

aluminum tape, sheet metal, or metal conduit.

See CAUTION statements at beginning of

manual for more details.

FIGURE 2 – Typical Installation of Model 1952/1953

c. To protect lamp, do not install lamp below any

source of water.

d. Install units so that Lamp is at least 3 in.,

but not more than 36 in., away from evaporator

coil surface.

Blower

e. Install lamp in a location that can be easily

accessed. Allow clearance to slide lamp in and

out of rooftop unit. Model 1952 lamp is 24 in.

and Model 1953 lamp is 32 in.

Evaporator Coil

90-747

f. Be certain the area in the equipment where you intend to drill and cut is free of any obstructions or components that would be

damaged by the installation or interfere with the installation.

g. While keeping these guidelines in mind, note that the more direct exposure the coil and drain pan receive, the

greater the benefit the lamps will have.

4

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INSTALL THE UNIT BASE

1. Using the Unit Base as a guide, mark the locations for the lamp and mounting holes on the rooftop unit cabinet.

2. Carefully inspect the inside of the rooftop unit and make sure that no damage to any components will occur as a result of

drilling the holes.

3. Drill hole for the lamp using a 2 in. hole cutter. At the mounting hole locations, use 3/32 in. drill bit to make pilot holes for

mounting screws.

4. Apply weatherproof sealant (not provided) to the side of the Unit Base that is in contact with the rooftop unit housing.

Mount the Unit Base to the rooftop unit using #10 sheet metal screws.

MAKE ELECTRICAL CONNECTIONS

1. Verify power to the HVAC equipment is shut off. Determine where the power for the unit will come from. The units can use

any voltage from 120 VAC up to 277 VAC (single phase), 60 Hz. The ballast automatically adjusts to whatever voltage is supplied in

that range. The units must be wired such that the disconnect switch of the air handler is also the disconnect switch

for the UV lamp. Additionally, to prevent accidental exposure to UV germicidal light, it is recommended that safety

interlock switches (not provided) be installed on any access panel door within view of the UV lamp. See Figure 3 for

Model 1952/1953 wiring diagram.

2. Use the hole in the bottom of the

Unit Base and a corresponding

hole through the rooftop unit

housing for the electrical wiring.

Be certain the area in the rooftop

unit where you intend to drill and

cut is free of any obstructions or

components that would be

FIGURE 3 – Model 1952/1953 Wiring Diagram

Yellow (2)

NOT USED

Blue (2)

Red (2)

damaged by the installation or

interfere with the installation.

3. If space limitations prevent

running the wires through the

hole in the bottom of the Unit

Base, drill holes in the side of

the Unit Base as well as the

rooftop housing for watertight

conduit connectors. Install the

connectors and run conduit from

the Unit Base to the rooftop

unit penetration.

Lamp Socket

Interlock Switch

Ballast

Interlock switches

(not provided)

recommended for

all access panel

doors

3A Fuse

Black

White

Green

Black

Green

4. Run wiring from the power

source through the conduit, if

applicable, and into the Unit.

Connect wiring to terminals

provided. Refer to wiring

diagram, Figure 3. Unit must

be grounded.

White

Ground

120VAC to

277VAC

Power Source

90-753

5. Shield non-metallic components (such as electrical wires and fan belts) that receive direct or reflected UV radiation with

aluminum tape, sheet metal, or conduit.

5

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INSTALL LAMP

1. Remove Lamp from shipping tube. Use ceramic ends of Lamp when handling – do not touch the glass tube of Lamp.

Use alcohol to remove any dirt and/or fingerprints from the Lamp.

2. Referring to Figure 4, follow the steps below to install Lamp:

a. First, with the Lamp Retaining Bracket removed, slide the Lamp into the large side of the keyhole slot.

b. Next, with the shorter side of the ceramic Lamp Base facing the small side of the keyhole slot, slide the Lamp over and into

the end of the keyhole slot. You should feel the Lamp Base engage the metal base of the keyhole slot.

c. Finally, return the Lamp Retaining Bracket onto the threaded stud of the Unit Base, securing with the washer and wing nut

provided. (Note: the Lamp Retaining Bracket butts up against, but not onto, the Lamp Base.)

FIGURE 4 – Model 1952/1953 Lamp Installation

Short side of Lamp Base

toward small side

of Keyhole Slot

Keyhole Slot

Lamp Base

Lamp Retaining Bracket

Threaded Stud

a

b

c

90-746

3. Attach the Lamp Socket to the Lamp.

4. Close the cover of the Unit Base using the latch mechanism on the front of the unit.

5. It is recommended that safety interlock switches (not provided) be installed on any access panel door within

view of the UV lamp.

6. Return all panel doors on the rooftop unit to their closed position.

7. Place three WARNING labels (included) on the rooftop unit: one by the Lamp, one on the main access panel, and one near

the main disconnect switch.

8. Turn on the power to the rooftop unit.

6

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CHECK LAMP OPERATION

The preferred method for checking lamp operation is to measure the current draw of the lamp using a clamp-on ammeter. To detect

the low current of the UV lamp, the ammeter must be capable of measuring 100 mA and above. To prevent accidental exposure to

harmful UV germicidal light during this procedure, the location where the amperage measurement is taken must be in a

separate compartment from where the UV lamp is installed. To measure the current draw of the lamp:

a. First, shut off power to the HVAC equipment.

b. Next, in the control panel for the HVAC equipment, locate the hot and neutral wires that were installed to provide power to the lamp.

c. Place the clamp-on ammeter around either the hot or neutral wire. Make sure the ammeter is set to read amps in the mA range.

Again, make sure that the UV lamp – or light from it, if it were on – is not visible from where the ammeter is placed.

d. Next, turn the power to the HVAC equipment back on.

e. If the lamp has been installed correctly and is drawing power, the amp reading will be a minimum of 150 mA. For multiple lamps,

the reading would be a multiple of this value, i.e., with two lamps installed, the amp reading will be at least 300 mA.

f. If the lamp is operating correctly, remove the ammeter from the wiring and put back any access panels that were removed during

this procedure. If the lamp is not operating correctly, refer to the ‘Troubleshooting’ section of this manual.

Note: If other electrical components or accessories share the same circuit as the UV lamp(s), the current draw will be higher and the

above method may not be an accurate indication of lamp operation.

INSTALLATION OF INTERNAL MOUNT ROOFTOP UNITS (MODEL 1972)

FIGURE 5 – Model 1972

Wiring Access Cover

Lamp Socket

Lamp

Mounting Brackets

90-744

7

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DETERMINE MOUNTING LOCATION

Verify that power to the HVAC equipment is off before continuing. To determine a mounting location for the lamp, use the criteria

below to select a proper location:

a. The lamps are intended for evaporator coil treatment. See Figure 6 for typical installations. If a single Lamp cannot illuminate the

majority of the evaporator coil, two or more units might be required. To the extent possible, the Lamp(s) should be centered on the

coil (or section thereof) being illuminated. Note that a Model 1972 Internal Mount Unit can be installed in conjunction with a

Model 1952/1953 External Mount Unit as shown.

b. Install lamp in location that prevents exposure of plastics, rubber, paper, and other non-metallic materials to UV light, or shield

such materials with aluminum tape, sheet metal, or metal conduit. See CAUTION statements at beginning of manual for

more details.

c. To protect lamp, do not install lamp below any source of water.

d. Install units so that Lamp is at least 3 inches away from evaporator coil surface.

e. Install lamp in a location that can be easily accessed. Allow clearance to slide lamp in and out of duct. Model 1972 lamp is 18 in. long.

f. Be certain the area in the equipment where you intend to drill and cut is free of any obstructions or components that would be

damaged by the installation or interfere with the installation.

g. While keeping these guidelines in mind, note that the more direct exposure the coil and drain pan receive, the

greater the benefit the lamps will have.

FIGURE 6 – Typical Installations of Model 1972

Blower

Evaporator Coil

90-749, 90-748

INSTALL THE UNIT BASE

Using the supplied brackets and supports, mount the unit to solid, non-moving structural components within the rooftop unit. As every

application is different, custom supports or brackets (such as ‘Unistrut’) may be required. Note that multiple Model 1972 units can be

assembled end-to-end, if desired. To do so, connect each unit with a nipple or similar conduit connector. Note that the units must be

wired in parallel circuits.

8

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MAKE ELECTRICAL CONNECTIONS

1. Verify power to the HVAC equipment is shut off. Determine where the power for the unit will come from. The units can use

any voltage from 120 VAC up to 277 VAC (single phase), 60 Hz. The ballast automatically adjusts to whatever voltage is supplied in

that range. The units must be wired such that the disconnect switch of the air handler is also the disconnect switch

for the UV lamp. Additionally, to prevent accidental exposure to UV germicidal light, it is recommended that safety

interlock switches (not provided) be installed on any access panel door within view of the UV lamp. See Figure 7 for

Model 1972 wiring diagram.

2. Run wiring from the power source through conduit, if used, and into the Lamp.

3. Shield non-metallic components (such as electrical wires and fan belts) that receive direct or reflected UV radiation

with aluminum tape, sheet metal, or conduit.

FIGURE 7 – Model 1972 Wiring Diagram

Interlock switches

(not provided)

recommended for

all access panel

doors

3A Fuse

Black

White

Green

Black

White

Green

Red (2)

Blue (2)

Ballast

Lamp Socket

Yellow (2)

NOT USED

120VAC to

277VAC

Power Source

Ground

90-754

INSTALL LAMP

1. Remove Lamp from shipping tube. Use ceramic ends of Lamp when handling – do not touch the glass tube of Lamp.

Use alcohol to remove any dirt and/or fingerprints from the Lamp.

2. Snap the Lamp into the two Lamp Brackets.

3. Attach the Lamp Socket to the Lamp.

4. It is recommended that safety interlock switches (not provided) be installed on any access panel door

within view of the UV lamp.

5. Return all panel doors on the rooftop unit to their closed position.

6. Place three WARNING labels (included) on the rooftop unit: there are two for access panels and one to be placed

near the main disconnect switch.

7. Turn on the power to the rooftop unit.

9

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CHECK LAMP OPERATION

The preferred method for checking lamp operation is to measure the current draw of the lamp using a clamp-on ammeter. To detect

the low current of the UV lamp, the ammeter must be capable of measuring 100 mA and above. To prevent accidental exposure to

harmful UV germicidal light during this procedure, the location where the amperage measurement is taken must be in a

separate compartment from where the UV lamp is installed. To measure the current draw of the lamp:

a. First, shut off power to the HVAC equipment.

b. Next, in the control panel for the HVAC equipment, locate the hot and neutral wires that were installed to provide power to the lamp.

c. Place the clamp-on ammeter around either the hot or neutral wire. Make sure the ammeter is set to read amps in the mA range.

Again, make sure that the UV lamp – or light from it, if it were on – is not visible from where the ammeter is placed.

d. Next, turn the power to the HVAC equipment back on.

e. If the lamp has been installed correctly and is drawing power, the amp reading will be a minimum of 150 mA. For multiple lamps,

the reading would be a multiple of this value, i.e., with two lamps installed, the amp reading will be at least 300 mA.

f. If the lamp is operating correctly, remove the ammeter from the wiring and put back any access panels that were removed during

this procedure. If the lamp is not operating correctly, refer to the ‘Troubleshooting’ section of this manual.

Note: If other electrical components or accessories share the same circuit as the UV lamp(s), the current draw will be higher and the

above method may not be an accurate indication of lamp operation.

IV. ANNUAL LAMP REPLACEMENT

The Aprilaire Ultraviolet Germicidal Lamp is designed for the lamp to be on at all times. After 9,000 hours of operation – 1 year of

constant use – the effectiveness of the lamp inside the unit diminishes and needs to be replaced. Rarely will a lamp burn out in one

year of continuous use; replacement is necessary because the lamp’s intensity decreases. Installation of the replacement lamp is best

handled by a qualified HVAC Service Contractor.

LAMP REPLACEMENT INSTRUCTIONS (EXTERNAL & INTERNAL MOUNT UNITS):

a. Shut off power to the rooftop unit. Wait several minutes for

lamp to cool before proceeding. Remove access panel(s) to

the rooftop unit.

d. For External Mount Units, close and secure the cover of

Unit Base.

e. Put access panels of the rooftop unit back in place.

f. Turn power to rooftop unit back on.

b. Remove Lamp from Unit. For External Mount Units, open the

cover of the Unit Base, disconnect Lamp Retaining Bracket,

and slide the Lamp to the large side of the keyhole slot and

then pull straight out. For the Internal Mount Unit, simply

disconnect Lamp Socket and remove Lamp.

g. Refer to ‘Check Lamp Operation’ of the previous section to

verify operation.

h. Record the date the lamp was replaced in this manual so

that the date for next replacement is clear.

c. Use alcohol to remove any dirt and/or fingerprints from the

new Lamp. Insert Lamp into the unit and attach Lamp Socket

to the Lamp.

Refer to ‘Troubleshooting’ section if the Lamp does not operate.

Under normal conditions, the Aprilaire Ultraviolet Germicidal Lamp should not require any maintenance other than annual lamp replacement.

10

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V. LAMP DISPOSAL

As with a fluorescent light bulb, the UV lamp contains mercury and must be disposed of properly. Do not throw old lamps into the

trash. Many communities have agencies that take in mercury along with other materials – such as old paints, solvents, etc. – that

require special disposal. Please contact your municipal or county waste collection agency for proper disposal procedures.

If a lamp is broken, do not use a vacuum cleaner to pick up the waste. Instead, sweep up the waste into a plastic bag and seal.

Contact your municipal or county waste collection agency for proper disposal procedures.

VI. TROUBLESHOOTING

If the Lamp does not operate, check the following:

1. Electrical Connections – Verify that the Lamp has been wired correctly. The power to lamp must be always ‘on’ during normal

operation. On External Mount Units, verify that safety switch inside the cover of Unit Base has not been damaged. The voltage into

the units should be in the range of 120 - 277 VAC / 60 Hz / single phase. If it is not in that range, re-check the wiring or contact

an electrician.

2. Fuse – If the lamp is still not illuminated, turn off power to the rooftop unit, and check the Fuse. Look to see if Fuse is darkened or

visibly blown (i.e., wire broken) or check fuse continuity with multi-meter.

3. Lamp – Verify that Lamp is not broken and is properly seated into Lamp Socket. To check this, shut off power to the rooftop unit

and wait several minutes for lamp to cool before proceeding. Then remove access panels in order to look at Lamp. Verify that lamp

tube is not broken and that it is firmly pushed into its’ Lamp Socket. If necessary, use alcohol to remove any dirt and/or fingerprints

from the lamp. If the lamp is broken read the ‘Lamp Disposal’ section of this manual for proper disposal.

4. Ballast – If all of the above is okay, but the light still does not illuminate, the starter in the Ballast is likely shorted out and the

Ballast must be replaced.

LIST OF REPLACEMENT PARTS

Multi-Voltage High Output Ballast

Model 1952 Replacement Lamp

Model 1953 Replacement Lamp

Model 1972 Replacement Lamp

#94

#96

#90

(for 1952, 1953, and 1972)

Fuse (3 Amp, slow burn)

Fuse Cap

#4466

#4412

#4413

#4414

Lamp Socket

VII. LAMP REPLACEMENT RECORD

Date

Dealer Name

Date

Dealer Name

11

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VIII. LIMITED WARRANTY

Your Research Products Corporation Aprilaire Ultraviolet Germicidal Lamp Model 1952, 1953 or 1972 is expressly warranted for three

(3) years from the date of installation to be free from defects. However the replaceable lamp is expressly warranted for only one (1)

year from the date of installation to be free of defects. Research Products Corporation’s exclusive obligation under this warranty shall

be to supply, without charge, a replacement for any part of the Ultraviolet Germicidal Lamp, which is found to be defective within a

three (3) year period (excluding Lamp which will be replaced if defective within one (1) year period) and which is returned no later

than thirty (30) days after the three (3) year period by you or your original supplier to Research Products Corporation, Madison,

WI53701, together with the model number and installation date of the Ultraviolet Lamp.

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 DISCOVERED IN THE

ULTRAVIOLET GERMICIDAL LAMP ITSELF.

IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE

AFORESAID THREE-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

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.

1015 E. WASHINGTON AVE. • MADISON, WI 53703 • PHONE: 888/782-8638 • FAX: 608/257-4357 • www.aprilairecontractor.com

B2203283

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