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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.
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.
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:
Evaporator Coil
Blower
FIGURE 6 – Typical Installations of Model 1972
90-749, 90-748