Control box MMI810.1 Mod 40-34

Description

Control box Honeywell Satronic MMI810.1 Mod 40-34

The MMI 810.1 Mod 40-34 gas burner safety control is suitable for fully automatic forced and induced draught gas burners.

It caters for burners with an intermittent pilot system (expanding flame), and those with interrupted pilot systems.

The control box provides a safe light-up and shut-down sequence for the burner and incorporates pre-purge, ignition and ignition safety time intervals, start or pilot flame and main flame stages.

The control is suitable for use on flame rectification detection only. It is certificated for use by most European Gas Authorities, and for precise approval details, see under, Technical Specification‘ the model numbers which apply in various countries.

The control box is housed in a tough transparent plastic cover, so that the working parts are easily seen. The plastic material used for the cover is of the self-extinguishing type.
Inside, a synchronous motor and cam switch assembly provide the timing sequence. The electronic flame detection amplifier and electrical components are mounted onto two plug-in printed circuit boards, whilst power to the external circuits e.g. gas valves, ignition system etc, is carried through conventional ‚point-to-point‘ wiring.
Manual reset from the lockout position is provided by a push button on top of the control and a lockout signal lamp is incorporated underneath this button. A single screw through the control box locks it onto the wiring base.
The wiring base is a robust plastic moulding, allowing adequate room when connecting up to the external wiring terminals supplied for live, neutral, burner motor, ignition etc.
A variety of cable entry points to the base is provided in the form of 4 easy knockout holes at the base ends and the underside. The base end holes are for PG11 screwed electrical fittings.
In addition a detachable cable entry plate is supplied which allows for either further screwed cable entry or simple entries for p.v.c. type wiring.

Flame lonisation Probe

This is not supplied as part of the control system. A flame electrode with good heat resisting properties and well insulated should be used for this. The flame electrode should therefore be similar to a good ignition electrode.

TECHNICAL SPECIFICATION

1. Electrical
Supply: 240V (+10%, –15%) 50 Hz (50 – 60 Hz)
Supply variations: Timings will only vary in proportion to the supply frequency.
Max. Fuse rating: 10A (rapid) 6A (slow)
Power consumption: 10 VA Max.
Max. output current per terminal:
- Kl.3 2 A, cos ϕ 0.2
- Kl. 4, B 2 A, cos ϕ 0.4
- Kl. 5, 6. C 1 A, cos ϕ 0.4
Total output current: 5 A, cos ϕ 0.4
Air pressure proving 5 A rating at 220/240V, reaction switch contacts: time better than 5 seconds.
Flame detection system: lonisation
Min. Fiame signal current: 1.0µA
Typical flame signal current: 10µA – 15µA
Max. flame signal current: 40µA – 50µA
Insulation standard: P44

2. Timings
Waiting time at start position: 9 secs approx.
Pre-purge time: 34 secs
Pre-ignition time: Nil Ignition safety time ts1: 5 secs max.
Approx. delay time to main flame: 10 secs. approx.
Main flame establishment time ts2: 5 secs max.
Reaction to loss of flame: Less than l.O sec.
Reset time from
lockout: None