8
E
.0
4.
99
• G.
13.
11.
02
Function
Carry out the following checks after commissioning and each time after the burner has been serviced:
Jumper gas pressure monitor: to do so, detach grey cube connector on KE 15 and remove cover. Close
ball valve during operation with jumpered gas pressure monitor: device must go into fault mode immediate-
ly after flame failure.
Start-up with closed ball valve and jumpered gas pressure monitor: device must go into fault mode after
safety time has elapsed.
After completion of check, reverse connection and re-establish original status.
Check air pressure monitor contact: device goes into fault mode when silicone connecting hose is
detached. Re-attach hose to connecting point
"+"
.
Bypass air pressure monitor before start-up: To so so connect terminals 5 and 7(on MMI 810) or terminals
4 and 7 (on DMG 970) in the lower part of the control box (see circuit diagrams page 17-18), burner must
not go into operation ! After completion of check,disconnect terminals and re-establish original status.
Safety and switching functions
A restart takes place in all cases following a mains power failure. An existing fault shutdown is retained.
In the event of a flame failure during operation, the fuel supply is immediately switched off and the control
box goes into fault mode within 1 sec.
If a flame signal is effected during pre-aeration, a fault shutdown is effected immediately.
The position of the air pressure monitor is continuously checked. There can be no start-up if it is not in its
neutral position. If the working contact is not made during pre-aeration or re-opens, a fault shutdown is ef-
fected.
In the event of a lack of air during operation, the air pressure monitor contact opens and the valves close
immediately. The device goes into fault mode within 1 sec.
Air flow setting, measurement "A"
1. Distance "A"
2. Locknut for air-restrictor setting
Turn screw (3) clockwise:
Air -
Turn screw (3) anticlockwise:
Air +
2
1
3
