Technical content reviewed November 12, 2026 · Tillman & Associates
Why exterior lamp service matters
[X] Plus mounts on the outside of HVAC equipment with its lamp projecting into the treatment area. The manufacturer describes a reinforced-polycarbonate NEMA 4X housing, lockable access and a lamp-retention arrangement designed for relamping from the exterior.
This can be useful on rooftop or through-the-wall equipment, particularly where cabinet access is difficult. The benefit depends on the actual installation: confirm that the full lamp can be withdrawn without interference from piping, walls or adjacent equipment.
Match the current electrical specification
The manufacturer’s Rev. F datasheet and May 2025 specification both list a 120–240 V driver. Do not assume the 120–277 V range listed for some other UV families applies to [X] Plus. Confirm the selected fixture label and supplied instructions before power is connected.
Send the full fixture model, available voltage and existing lamp/driver labels for replacement work. If documents disagree, ask Tillman to reconcile the selected assembly with the manufacturer before ordering.
Lamp support is a separate installation question
Review the lamp length, equipment-wall construction, support arrangement and service path together. Exterior access does not remove the need to support the lamp in accordance with the correct instructions.
Do not select a bracket from a similar product’s photograph or part number alone. Include the fixture label, lamp number and a sketch of the proposed support. Tillman can help identify the appropriate reference for the exact installation.
Define the treatment and exposure requirements
An enclosure rating concerns the housing; it does not state an airborne reduction percentage. Coil treatment and airstream treatment require different design considerations because stationary surfaces and moving air receive different exposure times.
Provide coil/duct geometry, airflow, temperature, humidity and outdoor exposure. Include any treatment-performance specification. The installer must also address UV leakage, access protection and materials inside the equipment; follow the complete fixture manual for safe installation and service.
What to send Tillman
- Exact fixture model and existing driver/lamp labels, if replacing
- Voltage and project electrical requirements
- Coil and cabinet dimensions, airflow and treatment objective
- Wall construction, proposed lamp support and withdrawal clearance
- Outdoor exposure, service access, access protection and monitoring needs
Common questions
Is every single-ended lamp suitable?
No. Confirm the lamp family, electrical requirements, base and fixture version. Length alone does not establish compatibility.
Can I reuse a support from SLX or SLNX?
Do not assume so. Send the proposed bracket, fixture and lamp identification for review against the applicable instructions.
Does NEMA 4X establish disinfection performance?
No. Treatment performance requires a review of the lamp layout and application conditions.
Technical references
- [X] Plus datasheet · PDF ↗
Datasheet · 2 pages
- [X] Plus specification · PDF ↗
Specification · 1 pages
- [X] Plus installation instructions · PDF ↗
Manual · 5 pages
Confirm the revision and exact assembly before ordering. This guide supports selection and parts inquiries; use the supplied installation instructions for the work.