LOW TO NO MAINTENANCE

Customers using Therma-Fuser modules for as long as 15 years testify that no maintenance at all has been required. What VAV box or control offers similar results? Or the Acutherm 10 year warranty?

EASILY ADAPTS TO OFFICE LAYOUT CHANGES

No Therma-Fuser zone is split when office walls are put up or moved, a common problem with VAV boxes.

AESTHETIC APPEARANCE, "ARCHITECTURAL LOOK"

The clean lines of the "architectural square panel" harmonize with the ceiling resulting in a virtually unbroken ceiling plane.

HOW IT WORKS

The model TF-HC Therma-Fuser module is a 24" x 24" ceiling diffuser with built-in temperature controls. The TF-HC has four dampers that open and close to meter air flow (warm or cold) into the room in response to room temperature. The dampers are mechanically actuated by thermal element thermostats.

Each thermostat is a small brass cylinder containing a petroleum-based wax. The wax expands when heated, driving a piston out. A spring retracts the piston when the wax is cooled and contracts. The movement of the piston positions the dampers in a proportional manner.

Average room temperature is monitored by inducing a sample of air from the room across the thermostats. Because this sample is drawn directly from the air circulation pattern in the room, just before it mixes with supply air flowing into the room, it better represents average room temperature than does a wall mounted thermostat. A properly applied TF-HC will hold the room within 1.5°F of the temperature selected.

Room temperatures may be set between 70°F/21°C and 78°F/25.5°C by turning the thermostat. Separate room thermostats for heating and cooling may be set at the same or different temperatures. The thermostats are concealed and out of casual reach but are easily accessible by holding down a hinged panel.

Changeover between heating and cooling modes is determined by supply air temperature. A third thermostat located in the inlet of the Therma-Fuser module senses supply air temperature as it enters from the duct. Changeover from cooling to heating begins at supply air temperature of 76°F/24.5°C and completes around 80°F/26.5°C. Changeover is achieved by disengaging the cooling thermostat and engaging the heating thermostat. Changeover black to cooling is completed when the supply air temperature reaches 68°F/20°C.

When supply air is warm, the Therma-Fuser module operates in the heating mode - the dampers open on a drop in room temperature. When the supply air is cold, it operates in the cooling mode - the dampers open on a rise in room temperature.

TF-HC THERMA-FUSER module APPEARANCE PANEL REMOVED

ADJUSTING TEMPERATURE

Room temperature set points for heating and cooling are separately adjusted by screwing the heating (red scale) or cooling (blue scale) thermostats in or out - in for cooler and out for warmer. Determine the set point by aligning the white indicator with the °F or °C numbers on the temperature scale.