BENSON OLYMPIC WH - Page 30

Fig 21
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I--
I--
Burner lights
on start gas
but fails to
I--
establish
main flame
I--
I
I
I
I
,-'- -- - -- - --- - ---- ~
Check Low
I
Check Controls
Flame Switch is
~
'On'
Check Control Check Slow
Check Burner
'---
'---
Acting Val ve
Check Gas
Excess Air
Check that Flue
Supply Gas C0 2 is as
advised
I Adju~t Damper
to SUlt
Low Gas Check Inlet Gas
-
Pressure Pressure
Check Main
Check Flame
Signal
t--
Burner Gas
Probe
I
Pressure
I
Position
~
Fig 22
Burner starts
but excess
temperature
cut out
shuts
down the
burner
on over
heat lockout
~
I-
-
'--
Insufficient air
Check air to inlet Remove
passing over
is not restricted Obstruction
Heat Exchanger
Clean Filters
Resistance too
Check Outlet
t--
high grilles are Open
Check Nozzles
~
are Open
Fan Belt slipping Adjust and / or
t--
replace Belts
Impeller slipping
Tighten
'--
Coupling
High return
Check for warm Reset Nozzles
(inlet) Air
air
short circuit away from
Temperature
to Air Inlet
adjacent walls
Faulty
or
incorrectly set
Reset Fan and
Fan and Limit
Limit
Control
Control
29