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Chrome-bevel sheet on grid paper — specs and return notes filed under the bay.
While cleaning the rod with a non-conductive abrasive (like a Scotch-Brite pad) can temporarily restore the signal
Standardized Compatibility: Verified direct cross-reference for legacy part 025-17175-002
it should be replaced immediately during the next valve maintenance cycle
It is typically used in horizontal ducts where the width exceeds the height
Tjernlund Products PS1503 Switch 326058-757 While cleaning the rod withThe Tjernlund Products PS1503 is a high sensitivity duct pressure switch engineered to automate HVAC accessories by detecting positive air pressure within the supply plenum or trunk lines. As the direct replacement for DFS 221 227, this SPST normally open switch simplifies field installations by eliminating the need for complex interlock wiring with the furnace blower. The PS1503 duct airstat features a snap acting mechanism triggered by a precise
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