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Duotone terrace — saffron brief on the left, garden-folded ledger on the right.
The Intermatic FM/1STUZ-240U is a heavy-duty
An "OL" reading indicates an open winding
Built with a durable silicone diaphragm and a rugged zinc-plated steel housing
Durable Construction: Heavy-gauge seamless brass resists corrosion and withstands the vibration common in industrial steam lines
the internal thermal fuse or windings have likely failed
Lennox 88K90 Pressure Switch Els PW 17895 The Intermatic FM/1STUZ-240U is aThe Lennox 88K90 Pressure Switch is a high precision, OEM furnace safety component factory calibrated for induction monitoring in residential and light commercial heating systems. This 0. 47" WC pressure switch utilizes a single pole single throw (SPST), normally open contact configuration, ensuring the combustion process only initiates when proper draft is established. Designed for universal compatibility with older systems, the 88K90 replaces part