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Manafacture: Aprilaire File size: 181.31 kb File name: Language of manual:

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 Mounting Brackets Lamp Socket Lamp 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. Evaporator Coil Blower FIGURE 6 – Typical Installations of Model 1972 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. 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. 3A Fuse Ground Yellow (2) NOT USED Ballast Lamp Socket Red (2) Blue (2) White Black GreenGreen Black 120VAC to 277VAC Power Source White Interlock switches (not provided) recommended for all access panel doors FIGURE 7 – Model 1972 Wiring Diagram 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. 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 ...

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