FAQs

Frequently Asked Questions for Wattstopper Room-Level Lighting.

• When should I use standalone occupancy sensors instead of a networked control system? 

  Standalone sensors are appropriate for small, simple spaces where you only need basic automatic on/off or vacancy control and no central scheduling. They minimize cost and complexity while still meeting many code requirements. 

• What is the difference between occupancy and vacancy sensors and where is each used? 

  Occupancy sensors can automatically turn lights on and off based on detected presence, while vacancy sensors require manual‑on and only shut lights off automatically. Many energy codes favor vacancy (manual‑on) in certain spaces to prevent unwanted automatic turn‑on. 

• How do I select the right sensor technology (PIR, ultrasonic, dual‑tech) for a room? 

  PIR works best with clear line of sight and obvious motion, ultrasonic detects smaller movements and can “see” around some obstacles, and dual‑tech combines both for higher reliability. Choice depends on room size, partitions, ceiling height, and the type of activity expected. 

• How do I place and aim ceiling or wall‑mount sensors for reliable detection? 

  Sensors should be located to cover entry doors and major activity areas, following manufacturer coverage diagrams. Avoid pointing directly at windows, HVAC vents, or sources of false triggers and keep within recommended mounting heights. 

• How do daylight sensors work and where should they be installed in a space? 

  Daylight sensors measure light levels and signal controls to dim or switch off electric lighting when enough natural light is present. They should be placed where they “see” representative task area light levels, not directly in sunlight or shaded corners. 

• How do wall‑box sensors compare to ceiling sensors for smaller rooms? 

  Wall‑box sensors combine a switch and sensor in a standard device location and are easy to retrofit in small offices or rooms. Ceiling sensors typically offer wider and more uniform coverage in larger or oddly shaped spaces. 

• How should I set time delays and sensitivity to balance energy savings and user comfort? 

  Shorter time delays increase savings but can annoy occupants, while very long delays waste energy. Start with manufacturer‑recommended defaults and adjust based on feedback and observed behavior in the space. 

• How can room controllers and power packs simplify wiring for multiple sensors and loads? 

  Room controllers centralize load switching and dimming, allowing multiple sensors and switches to connect with low‑voltage control wiring. Power packs can provide the necessary line‑voltage switching for several circuits from a single location. 

• How do standalone time switches help meet after‑hours shutoff requirements? 

  Time switches automatically turn off lighting at preset times, ensuring lights are not left on overnight or during unoccupied periods. They can be combined with overrides and sensors to meet code while preserving user convenience. 

• How do 0–10 V dimming controls integrate with LED drivers at the room level? 

  0–10 V controls send a low‑voltage signal to compatible LED drivers, dimming fixtures up or down based on control settings. Room controllers or wall stations can provide this signal while also handling line‑voltage switching. 

• How do Wattstopper room controls help meet ASHRAE 90.1 and IECC requirements? 

  DLM and standalone controls implement required features like automatic shutoff, partial‑OFF, bi‑level switching, and daylight response. Wattstopper application guides show specific device combinations that satisfy code for common space types. 

• How do I handle multi‑room restrooms, corridors, and open offices with room‑level controls? 

  Use multiple sensors linked to shared room controllers or relay packs so that all relevant luminaires respond appropriately. Zoning should reflect logical use areas while still meeting code limits on maximum uncontrolled area per sensor. 

• How do room controls interface with plug load receptacle control requirements? 

  DLM room controllers can drive plug‑load control modules or controlled receptacles that follow the same occupancy logic as lighting. This ensures non‑critical receptacles shut off when the space is vacant, as required by energy code. 

• What is Plug n Go behavior in DLM room controllers and why does it matter? 

  Plug n Go means that when DLM devices are connected on the room bus, they automatically configure a default, code‑ready sequence of operations without custom programming. This greatly speeds installation and reduces the need for specialized commissioning tools on typical projects. 

• How do I commission or adjust Wattstopper room controllers without specialized software? 

  Most DLM room controllers can be adjusted via simple button sequences, on‑device interfaces, or basic configuration tools. This allows electricians and facility staff to fine‑tune settings without needing full‑blown software or laptops. 

• How do room‑level Wattstopper controls support retrofit projects with minimal rewiring? 

  Wall‑box sensors, stand‑alone room controllers, and certain wireless devices can reuse existing switch legs and circuits where feasible. This minimizes ceiling and wall work while still bringing spaces up to current control expectations. 

• What troubleshooting steps help resolve nuisance shutoff or failure to turn off? 

  Check sensor placement, sensitivity, and time delays first, then verify wiring, load types, and any conflicting manual overrides. Manufacturer guides provide specific troubleshooting trees for common symptoms like false‑OFF or lights staying on. 

• How does Summit Electric Supply support selection and stocking of Wattstopper room‑level devices? 

  Summit helps match sensors, switches, and room controllers to each space type and code requirement in your design. They also stock common SKUs so contractors can respond quickly to change orders and punch‑list items.