Fireye 57YB4-5000 Tester 320788-703 making it ideal for high-traffic

making it ideal for high-traffic zones or areas where external occupancy inputs are utilized via the BAS network

this means a 1:1 fit with no field-drilling or wiring modifications required

and DFP unit heaters to prevent hazardous operation under venting or blower failures

it is highly recommended to install it with the solenoid coil in a vertical upright position to prevent sediment build-up and ensure optimal plunger longevity

As a direct replacement for the 343-701-400

Fireye 57YB4-5000 Tester 320788-703 making it ideal for high-trafficThe Fireye 57YB4 5000 Tester is a specialized diagnostic instrument designed for field technicians to verify the operational integrity of flame safeguard controls and Fireye amplifier modules. Engineered for 120V circuits, this combustion control tester allows for the simulation of flame signals and the checking of internal sequencing without requiring the boiler or burner to be operational. It provides a reliable interface for testing flame scanners