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UNIT HEATER
To measure flame current, connect
a 0 - 50 µA DC meter in series with
The flame probe by using the flame
probe jack plug.
If the meter reads Negative values
then reverse the test leads.
Maximum flame current Minimum flame current
with no flame with pilot only
0 to 0.5 µA D.C. 1.0 µA D.C.
Typical flame current
3.0 to 5.0 µA with main
Burner ON
Conne ct a D.C. amm eter in
series with the flame probe
using the jack plug provided
Turn on all c ontrols and
ensure that there is a supply
to the burner
Green light ON
YES
Is there a current flowing in Repair or replace
the flame probe circuit Inspect and test the flame probe as necessary
with no flame present and wiring for damaged
insulation and short circuits
to earth
NO
YES
Does "lockout" occur when Check adequate gas pressure Control box faulty
there is a flame present ?. Replace flame probe and ensure Replace with correct type
that it is fitted correctly.
Check fro correct earthing of
heater
Check that live and neutral
NO polarity are correct
Burner Operating
8.3 Flame Supervision System
8.3.1 Automatic Ignition Systems
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