Therma-Fuser diffuser is a fully integrated, independent zone VAV control system including thermostat, modulating damper and diffuser in a single package. Unlike conventional building controls, Therma-Fuser diffusers require no wiring and operate automatically and independently. Therma-Fuser diffusers require little or no maintenance. Therma-Fuser diffusion dampers operate by opening and closing automatically to regulate air flow into the room in response to room temperature.

The dampers are mechanically actuated by thermal element thermostats. Each thermal element thermostat is a small brass cylinder containing petroleum-based wax. The wax expands when heated, driving a piston out. A spring retracts the piston when the wax cools and retracts. The movement of the piston either opens or closes the air dampers in a proportional manner.

Average room temperature is monitored by inducing a sample of air from the center of the room across the thermal element thermostats. Because this air sample is drawn directly from the air circulation pattern in the room, just before it mixes with air flowing into the room, it better represents average room temperature than air at a wall thermostat.

With Therma-Fuser diffusers, room temperature throughout the room can be held within 1 1/2º F of the temperature selected. Temperature of the room is selected between 70º and 78º F by adjusting the thermal element thermostat.

LEED Credit Overview

Therma-Fuser diffusers will serve as an integral part of the HVAC system in a LEED certified building by:

A) Creating the ultimate low energy approach by designing an all low pressure, low turndown, individually zoned system.therma-fuser

B) Providing Individual Temperature Control.

C) Maintaining Excellent Thermal Comfort.

D) Producing High Room Air Change Effectiveness.

E) Monitoring Individual Spaces.

F) Offering Innovative Benefits.

Use of Accutherm Therma-Fuser may contribute to the following LEED credits:

* EA Prerequisite 2: Minimum Energy Performance
* EA Credit 1: Minimum Energy Performance
* EA Credit 5 Measurement and Verification
* IEQ: Prerequisite 1: Minimum Indoor Air Quality Performance
* IEQ: Credit 6.2 Contollability of Systems – Thermal Comfort
* IEQ: Credit 7.1 Thermal Comfort – Design
* IEQ: Credit 7.2 Thermal Comfort – Verification


imageDavid M. Pratt

David M. Pratt, P.E., CEM, LEED AP is an Energy Management Consultant for Sustainable Climate and Energy Solutions group of MWH Americas, Inc.
MWH is the global leader of the wet infrastructure sector.

The MWH organization is driving the wet infrastructure sector globally, and we are leading the world in results-oriented management, technical engineering and construction services to build a better world.


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