TTillman & AssociatesSouth Texas HVAC Rep

Steril-Aire / UV Resources

UV-C monitoring, interlocks and installation accessories

Choose controls according to the question they answer: lamp status, service hours, UV output or safe access.

Technical content reviewed November 12, 2026 · Tillman & Associates

Monitoring functions are not interchangeable

A useful controls schedule identifies what operators need to know and what action should follow a fault. Separate the indication that a lamp/ballast is operating from elapsed service time, measured UV output and access-door protection.

CU2 senses lamp/ballast current and provides local status plus a remote signal. UV-Repeat combines compatible status signals for remote monitoring. These help operators identify a fault; they do not measure treatment throughout a coil face or an entire airstream.

Hours and UV measurement answer different questions

A lamp hour meter tracks elapsed operation to support replacement planning. It does not directly measure UV energy at the treatment surface.

UV Report uses a sensor to display relative UV output and operating hours. Sensor location and commissioning matter: a reading at one location does not automatically demonstrate the minimum dose everywhere in a system. Tell Tillman whether the requirement is maintenance indication, alarm reporting or an engineered performance measurement.

Access interlocks are part of installation safety

The manufacturer offers a 12 V contact-controller arrangement and a separate hardwired door safety switch. The exact circuit depends on the fixture and installation. Have the installer identify every opening that can expose personnel to the UV system.

The door-switch instructions state that the access switch is secondary protection and must not be used as the main disconnect. A monitoring signal is not a substitute for an interlock. Follow the complete wiring and isolation instructions supplied for the selected equipment.

Prepare a practical controls and accessory schedule

Document the fixture count, power supplies, existing controls and required building-management inputs. Note whether the desired signal is per lamp, per fixture group or a general fault. Signal type, power requirements, enclosure and wiring compatibility must be checked before purchase.

Include mounting/support hardware and service access in the same review. A correctly identified electrical control does not resolve an unsuitable lamp support or an inaccessible service location. For existing systems, send clear label and terminal photographs; do not infer compatibility from a control’s appearance.

What to send Tillman

  • Fixture and power-supply models and quantities
  • Required information: on/off, hours, UV measurement or fault alarm
  • BMS input/signal requirements and intended alarm response
  • Supply power, installation exposure and enclosure needs
  • Access-door count, interlock arrangement and main power isolation
  • Existing controls, wiring labels and mounting/support requirements
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Common questions

Does a green lamp-status LED verify disinfection?

No. Operating status and delivered UV dose are different measurements.

Can an access switch serve as the main disconnect?

The manufacturer’s door-switch instructions say it should not. Follow the required separate power-isolation arrangement.

Can all these accessories be used with every UV fixture?

No. Review fixture compatibility, electrical signals, power, enclosure and wiring requirements for the exact assembly.

Technical references

Confirm the revision and exact assembly before ordering. This guide supports selection and parts inquiries; use the supplied installation instructions for the work.

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