Aprilaire 1953 & 1972 - Manual (Page 4)

4
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.
Lamp
Unit Base
Ballast
Fuse
Lamp
Retaining
Bracket
Lamp Base
Lamp Socket
Safety Interlock Switch
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:
Evaporator Coil
Blower
FIGURE 2 – Typical Installation of Model 1952/1953
90-747