16
E
.0
4.
99
• G.
13.
11.
02
Service instructions/dimensions
Service instructions/dimensions
Measuring ionisation current
The ionisation current must be measured during burn-
er start-up and maintenance or after a fault indication
in the control box.
Measurement of ionisation current shortly after burner
start during:
• Maintenance
• Start-up
• Fault indication.
To do so:
•
Open plug connection between cable to control box and cable from ionisation electrode.
•
Connect ammeter in series. Measuring range 0...200
µ
A DC.
l > 5 µA (MMI), > 2 µA (DMG) - o. k.
l < 5 µA (MMI),< 2 µA (DMG)
- Unsafe operation!
- Clean burner pipe
- Bend ionisation rod in flame area
- If necessary, replace combination electrode
- If necessary, reverse polarity on ignition transformer (induction current)
- Eliminate moisture and deposits.
Servicing air pressure monitor
• Detach silicone connecting hose and clean, check
switching function.
• Replace air pressure monitor if switching function is
no longer O.K.
To do so:
• Disconnect burner from power supply
(pull 7-pin connector X12).
• Screw off cover.
• Disconnect electrical connectors.
• Release retaining screws on motor.
• Reassemble in reverse order.
„+“ denotes the connecting point for
pressure measurement!
