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Ultraviolet Germicidal Lamps
Model 1952
24” Rooftop Unit
Model 1953
32” Rooftop Unit
Model 1972
Rooftop Unit, Internal Mount
Safety, Installation and Service Manual
Models 1952, 1953 & 1972
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TABLE OF CONTENTS I. Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 IV. Annual Lamp Replacement . . . . . . . . . . . . . . . . . . . . .10 II. Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 V. Lamp Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 III. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 VI. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . .
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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
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INSTALLATION OF EXTERNAL MOUNT ROOFTOP UNITS (MODELS 1952 & 1953) FIGURE 1 – Model 1952/1953 Safety Interlock Switch Ballast Lamp 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 mor
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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 Un
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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 e
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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,
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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 illumin
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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 recommen
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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,
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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 int
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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
