Tjernlund PS1503 Positive Pressure Duct Airstat

Tjernlund PS1503 Positive Pressure Duct Airstat provides reliable positive pressure control for HVAC duct systems. This duct airstat uses a vertical diaphragm and a self-sealing, integral pressure probe to monitor pressure and trigger a SPST snap-action switch.

Designed for vertical installation in ductwork, the unit combines compact size with rugged performance. It features a 5" diameter x 3" height profile, a wide operating temperature range from -40 to 190°F, and a maximum pressure rating of 1/2 psi. The control is built for durability in commercial and residential HVAC applications and offers consistent response across changing duct conditions.

Key specs at a glance include the SPST, non-adjustable snap-action electrical switch, the self-sealing integral pressure probe, and a broad voltage/current footprint suitable for pilot-duty circuits. This makes the Tjernlund PS1503 a reliable choice for positive pressure regulation in duct systems and a smart addition to any duct stat collection.

• Type: Positive Pressure Duct Airstat (PS1503)
• Dimensions: 5" diameter x 3" height
• Operating range: -40 to 190°F
• Maximum pressure: 1/2 psi
• Electrical switch: SPST, snap-action, non-adjustable
• Mounting: Vertical (Diaphragm)
• Pressure sensing: Self-sealing, integral pressure probe
• Electrical ratings: Pilot duty 24–277 VAC; Current 15 A non-inductive at 277 VAC; VA 278–300