Acutherm manufactures components for heating and air conditioning systems that make commercial buildings more comfortable, save energy, offer sustainability and can also reduce total installed costs. Our components are called Therma-Fuser TM variable air volume (VAV) diffusers. They are used in VAV air conditioning systems which, instead of varying the temperature of the cooling air, vary the amount of the cooling air to maintain even room temperatures.

Products: VAV Air Diffusers (4-way & slot), Voting Systems



Acutherm Low Pressure VAV Diffusers


What is a Therma-Fuser™ Diffuser?

Each Therma-Fuser™ diffuser is an independent zone of VAV control including thermostat, modulating damper and diffuser in a single package. Unlike conventional building controls, Therma-Fuser™ diffusers have no complicated electronics or pneumatics, and as a result require no maintenance.

How do Therma-Fuser™ Diffusers work?

Therma-Fuser™ diffusion dampers open and close 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.