Aprilaire 1953, 1972 Owner's Manual

Safety, Installation and Service Manual

Models 1952, 1953 & 1972

Ultraviolet Germicidal Lamps

READ AND SAVE THIS MANUAL

Model 1952 24” Rooftop Unit

Model 1953 32” Rooftop Unit

Model 1972 Rooftop Unit, Internal Mount

I. SAFETY INSTRUCTIONS

WARNING

Ultraviolet light is harmful to eyes and skin. Never look at light produced

by this lamp. Shut off power to lamp before servicing.

Electrical shock from 120 - 277 VAC may cause serious injury. Shut off

power before starting installation and do not turn power back on until complete.

Sharp edges may cause personal injury. Use care when cutting and

handling sheet metal.

Lamp may cause personal injury in the form of burns or cuts. Wear

protective gloves and safety glasses when handling lamp. To prevent burns, shut off power to lamp and allow to cool for several minutes before servicing. If lamp is broken, refer to lamp disposal section of this manual.

CAUTION

UV light can cause color changes or structural degradation of plastics, rubber, paper, and other non-metallic materials used in the HVAC system.

• 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.

• Shield electrical wires that receive direct or reflected UV radiation with aluminum tape, sheet metal, or conduit.

• Install lamp at least 8 inches away from equipment or components made with UV resistant plastic. If equipment or components are not made with UV resistant plastic – or if the UV resistance of the material is unknown – shield with aluminum tape or sheet metal.

Water may damage lamp.

• Install lamp at least 3 inches away from evaporator coil.

• Do not install lamp below a humidifier or any source of water.

Please read the safety and installation instructions carefully to help ensure a correct and SAFE installation of the Aprilaire Ultraviolet Germicidal Lamp.

TABLE OF CONTENTS

I. Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

II. Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

III. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Installation of External Mount Rooftop Units

(Models 1952 & 1953) . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Installation of Internal Mount Rooftop Units

(Model 1972) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

IV. Annual Lamp Replacement . . . . . . . . . . . . . . . . . . . . .10

V. Lamp Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

VI. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

VII. Lamp Replacement Record . . . . . . . . . . . . . . . . . . . .11

VIII. Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

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.

Exter

nal 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.

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

Failure to do so could lead to personal injury and/or equipment damage.

• Read the installation manuals for the equipment on which

the lamps are being installed for additional information and warnings.

• 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.

• 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.

• Shut off power to HVAC unit at the main disconnect

switch before starting installation.

Coil Area Model 1972 Model 1952 Model 1953

(sq. in.) (sq. ft.) 18” Lamp 24” Lamp 32” Lamp

750 5.2 1 1 1 1000 6.9 2 1 1 1250 8.7 2 2 1 1500 10.4 2 2 2 1750 12.2 3 2 2 2000 13.9 3 2 2 2250 15.6 3 3 2 2500 17.4 4 3 2 2750 19.1 4 3 3 3000 20.8 4 3 3 3250 22.6 5 4 3 3500 24.3 5 4 3

Model 1972 Model 1952 Model 1953

Coil Area 18” Lamp 24” Lamp 32” Lamp

(sq. in.) 792 1008 1296 (sq. ft.) 5.5 7.0 9.0

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.

GUIDELINES FOR THE NUMBER OF LAMPS REQUIRED FOR A GIVEN COIL AREA

APPROXIMATE COIL AREA COVERAGE FOR EACH MODEL

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

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.

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.

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.

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 1 – Model 1952/1953

90-745

DETERMINE MOUNTING LOCATION

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

FIGURE 2 – Typical Installation of Model 1952/1953

90-747

Safety Interlock Switch

Lamp

Fuse

Lamp Retaining

Ballast

Unit Base

Bracket

Lamp Base

Lamp Socket

Blower

Evaporator Coil

+ 8 hidden pages