Interoperable Linear Slot Therma-Fuser (EL)

• Model: EL — Interoperable linear slot Therma-Fuser diffuser
• Protocol: Native BACnet™ MS/TP, BTL® Tested and Listed to ANSI/ASHRAE Standard 135
• Construction: Linear slot diffuser with integrated DDC controller, room and supply air temperature sensors, flow sensor, and VAV damper
• Nominal Lengths: 24″, 36″, 48″, 60″ (metric 600, 900, 1200, 1500 mm available)
• Slots / Blow Patterns: 1-slot, 2-slot, or 4-slot; 1-way or 2-way linear discharge
• Inlet: Side or Top connection options

• Damper blade(s) open and close to meter hot or cold air into the space in response to room temperature.
• Brushless DC stepper motor directly drives the damper via a threaded shaft and linkage (no gearbox) for long life and precise positioning.
• Venturi-driven induction chamber continuously samples secondary room air over the room temperature sensor.
• “Expert system” control evaluates temperature relationships and rate/direction of change every 10 seconds and adjusts flow accordingly—no PID tuning required.

• Cooling mode: Blades open on a rise in room temperature to deliver more cool air.
• Heating mode: Operation reverses—blades close on a rise in room temperature.
• Mode is selected automatically by comparing supply air temperature with room temperature and setpoint; BAS can override mode selection if needed.

• Measurements to BAS: Room temperature, supply air temperature, and airflow at the diffuser.
• Setpoints: Separate cooling and heating setpoints for each occupancy mode (Occupied, Unoccupied, Standby), plus vacancy offsets and adjustable limits.
• Flow Settings: Maximum flow, minimum flow, standby minimum flow, and heating-only maximum flow.
• Overrides: All built-in sensors and damper position can be overridden (open, closed, or defined flow).
• Special Features: Interface capability with CO₂ sensors (by others) and purge-room functions; reporting of terminal load to the BAS.

• Internal Insulation: FF — internal insulation liner.
• Ceiling Frames: APF (hard ceiling frame), TG916 (tegular 9/16″ T-bar).

EL diffusers ship in the open position so systems can be balanced before network and power are connected. Heated thermistor flow sensing and induced room-air sampling ensure accurate, low-maintenance measurements over the full VAV range.