Honeywell Gas boiler control unit S4560A1008U

The Honeywell S4560A1008U is a gas boiler control unit for atmospheric gas burners. It operates in intermittent cycle mode with direct ignition and flame monitoring via a sensor rod. The unit conforms to EN 298 and features a non-volatile lockout with manual reset. It operates at 220–240 V, 50 Hz, with a power consumption of 10 W and a safety time of 10 s. The control box has a Molex 3001 multi-edge connector, supports a fan, and is rated IP40. It is maintenance-free and requires external fuses and a thermal relay.

Control boxes of this type are selected by matching the supply voltage, frequency, safety time, and connector configuration of the existing installation. Before ordering, compare the mounting dimensions and terminal sizes with the original unit. During installation, provide external fuses for safety and place the controller away from heat and radiation. The overall enclosure protection must be at least IP40, and spark ignition cables must be shielded. These controllers have no user-serviceable parts; do not attempt internal repairs.

Typical failure of these control units is a lockout when the flame is not detected within the safety time, often caused by a dirty or misaligned flame sensor rod. If the flame goes out during operation, the unit repeats the ignition sequence. Lockout is non-volatile and requires manual reset via the external or internal reset button. If the first reset fails, wait at least 15 seconds before again attempting reset.