Flame Safeguard Control
Replacement for Honeywell models RA890F, RA890G and R4795
(Q270A Base compatible)
The microSB 407M is a microprocessor-based control system designed to automatize gas, gas-oil and fuel oil burner operations, on any kind of boilers, ovens and heaters.
Its advanced design replaces old electromechanical units with a high reliability electronic one, easily repairable in case the need arises. We offer continued support, service and spare parts.
It has a variable pre-purge time (3, 15, 30, 45 and 60 sec), selection of the flame sensor by means of pluggable flame amplifiers for UV C7027A, LD Photoresistence, Rectifying Photocell and Flame Rod. One amplifier of your choice is included with each microSB. Replacement flame amplifier are available at very low cost.
Its microprocessor system, controls operation and displays status and diagnosis by means of a multi-color indicator on the front panel.
(This conections differ slightly for model R4795)
Limit switch in series with L1 (Power)
Pilot fuel valve
Main fuel valve
Blower contactor / Air flow switch
Air flow switch
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