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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.
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