SCAH VAV COOLING/ADJUSTABLE HEATING
SCAH Operational Air Flow
While providing VAV cooling control, the SCAH diffuser has an adjustable heating override that can be set to limit maximum flow in the heating mode. Occupant has the ability to set the position between full open to full closed.

The SCAH is for heating and cooling application areas, such as rooms with heavy office equipment, where cooling loads always exist but supply air at times may be heated. The SCAH is ideal for these applications because when supply air is warm the diffuser will close to desired opening and will not open regardless of room temperature when heating.
ASHRAE standard 90.1 requires controls in an HVAC system that limit the reheating of air that was previously cooled.
FEATURES

• Control functions that automatically adjust temperatures in individual spaces.
• No control wiring, pneumatic piping, or added system pressure required.
• Existing systems are easily upgraded with the various diffusers available.
• Separate and adjustable set points for heating and cooling.
• Easy access set point adjustment.
• Diffuser constructed of 24 gauge sheet steel.
• Architecturally pleasing, blemish free hemmed face panel.
• Cone shaped diffusion damper.

 

HOW IT WORKS

Model SCAH VAV cooling with adjustable heating control diffuser utilizes three thermal actuators. Two thermal actuators located in the supply path provide constant volume heating. Heating supply volume is adjustable from full open to full close. Factory heating volume is set to minimum flow, 1/4" open. A third thermal actuator provides VAV cooling control.

Please see Download SCAH PDF's located on this web page for the
following information:
• PERFORMANCE DATA — SCAH Guide Specification & Performance 
• SCAH SUBMITTAL — SCAH Dimmensional Data & Technical Drawings
• EZ TEMPERATURE SCALE — Temperature Adjustment Scale Diagrams
• IOM — Face Panel Removal / Cooling & Heating Adjustment Directions
• RELIEF TYPE — By-Pass Control Information & Diagrams

MAKING ADJUSTMENTS

FACE PANEL REMOVAL FOR TEMPERATURE ADJUSTING

Please refer to the IOM PDF under Download SCAH PDF's located on this web page for
Face Panel Removal / Cooling & Heating Adjustment Directions & Photographs





VAV SQUARE PERFORMANCE / DIMENSIONAL DATA

Please refer to the Performance Data & SCAH Submittal PDF's under Download SCAH PDF's located on this web page for Performance and Dimensional Data.