Lamtec ETAMATIC OEM, Quick Reference

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4 Operating Description
4 Operating Description
A signal is first fed to terminal 58 (Burner On) indicating when the burner is to start.
The ETAMATIC OEM then interrogates the boiler safety interlock chain (ETAMATIC) or the
common safety interlock chain (ETAMATIC OEM) and the contact of the air pressure monitor.
If it does not detect an "OK" condition, the text of a corresponding message appears and the
operating control stops.
If all signals are OK, the fan output is activated and the ducts run to their bottom stop as a
check.
Once all channels have reached their bottom stop, they open for aeration. The valve leakage
test runs in parallel (gas operation only).
In the case of control elements the aeration is used to enter and/or test the range limits. After
reaching its top position, the fuel control element runs back into the ignition position. All other
channels remain in OPEN position. The ETAMATIC OEM then interrogates the air pressure
monitor. If this signal is OK, the parameterised aeration time runs. If a channel is configured
for re-circulation, it opens with a time-delay. On reaching the parameterised re-circulation de
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lay time, the aeration time stops. As soon as the re-circulation channel has reached the aera
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tion position, the aeration time is resumed. When this time has expired all the channels run to
the programmed ignition position (re-circulation fully closed). After the lapse of the aeration
time, all channels run to the programmed ignition position (recirculation closed).
Once all the channels have reached the ignition position the ignition transformer is activated
on ist own for 3 seconds.
Before the valves open, the respective fuel safety interlock chain has to be close.
4.1 Starting with Pilot Burner
The ignition valve and main gas 1 (in gas operation) or the ignition valve alone (in oil operation)
run open. The pilot flame forms and the flame detection detects the flame. The flame detection
sends the signal to the burner control device.
On expiry of the 1
st
safety time, the ignition transformer switches off. For 3 sec. (stabilisation
time) the pilot burner burns alone. Then main gas 2 or the oil valve opens and remains acti
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vated in parallel with the ignition valve for the duration of the 2
nd
safety time. The ignition valve
closes again at the end of this period.
3 seconds after ignition, all channels run to the programmed base firing rate point. The ETA
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MATIC OEM remains in base firing rate position until control release is given.
After control release the ETAMATIC OEM follows the power control unit’s default setting.
A shut off follows the cancelling of the signal of the terminal 58. The main valves close. In gas
operation, first main gas 1 and second main gas 2 closes with a delay of approx. 5 sec., in
order to allow the test line between the solenoid valves to burn out. In the event of a fault shut-
down, both close immediately.
If configured for post-purge, the air channels open again for this period.
Thereafter the ETAMATIC OEM is in the "OFF" mode.
4.2 Starting without Pilot Burner
The main valves open and together with the ignition transformer remain activated for the du
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ration of the safety time. During this time the flame signal appears.