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
External 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
•Shut off power to HVAC unit at the main disconnect switch before starting installation.
APPROXIMATE COIL AREA COVERAGE FOR EACH MODEL
| 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 |
GUIDELINES FOR THE NUMBER OF LAMPS REQUIRED FOR A GIVEN COIL AREA
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 |
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.
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