Tjernlund PS1503 Positive Air Flow Pressure Switch
Price: $93.00 per pcs
Availability: Contact for availability — call (347) 262-9561 for lead time
Category: General Plumbing
Description
A Tjernlund PS1503 positive air flow pressure switch. It proves that a power venter or draft inducer is actually moving air before the burner is allowed to fire — the fan running is not proof, since a blocked flue or a failed impeller can leave a motor turning and no flow. The switch senses that proof and interlocks the burner, which is why an appliance will lock out rather than fire into an obstructed vent.
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