York
3-flash
ProtectIGC 3-flash — example
Example on many CES rooftop IGC stickers: limit open. Confirm THIS sticker.
Walk 3-flash in Diagnose
Sign in for the next measurement
First check
1 Airflow before you touch the limit
On York ZF a limit is airflow or overfire until proven otherwise. Do not replace the limit first. Filter, blower wheel, A-coil, and the heat-speed setting for THIS motor (tap, model plug, or communicating CFM — not a sister SKU chart). Filters, belt, 3-phase blower rotation, rise vs the rating plate.
Expect: TES / static: External static vs the blower table for this tonnage — rooftops run dirty.
The rest of the walkthrough is Diagnose.
On the plates
- Filters, belt, 3-phase blower rotation, rise vs the rating plate.
- A 3-flash that returns on a clean filter is static or overfire, not a bad limit.
Plates that use 3-flash
Same number, other makers
3-flash on York is not the same code on these plates.