Sequence Of Operation - Beckett CG10-24 Manual

Sequence of Operation

This operation sequence is
typical for operation with a 7590
control. This is the only control approved for use on
the CG10-24.
Do not start the burner yet.
(Reference Table 7 )
Call for heat, Status LED is turned on.
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— Control performs safe-start check
— If safe-start fails, control locks out.
— If safe-start passes, control checks for presence
of flame.
— If flame is present, control will enter hold state
until flame is no longer present. Flame LED and
Status LED will flash until flame is no longer
present.
— If flame is not present, control will check status
of air proving switch. If switch is closed,
(indicating the pressure switch is stuck) control
will enter lockout.
If the air proving switch is open, the motor will start.
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Once the air proving switch closes, pre-purge will begin
(lasting typically 60 seconds). Pre-purge or ignition
timings will not start until the air proving switch closes.
— The air proving switch must close to prove
combustion air is present. If switch fails to close
during the specified period, the control will enter
lockout.
Table 7 – Operating Sequence
Call for Heat
FLAME
LEDs
MV
Status LED
turns on
Timers &
Timings
Flame Check On
Motor/Blower
Air Switch Check On
Igniter
Gas Valve
Burner Manual — CG10-24
Motor Start
FLAME
MV STATUS
STATUS
Status LED
ON
Pre-purge Timer
1 - 240 Seconds
On
Blower Starts
Air Switch Closes
When pre-purge is completed, the control turns on the
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igniter and the gas valve. MV LED will turn on.
— Spark continues until end of ignition timing or
until flame is proved.
Once flame is proved, The Flame LED is turned on
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and the spark is turned off. The gas valve and MV LED
remain energized.
— If flame is not proved, the control will lockout or
enter the inter-trial waiting period. Status LED
will flash rapidly for lockout or slowly for inter-trial
waiting.
— If multiple trial logic is used, the control will
complete the trials for ignition
— When flame is proved the control will continue in
run mode until the end of the call for heat.
When the call for heat is ended, the gas valve, MV
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LED, Flame LED, Status LED and motor turn off.
Additional information on control operation is available in
the GeniSys 7590 Control Manual (61981-001).
7590C control, the difference is the timer wired into
the valve circuit will enable Low Fire Start.
Pre-purge Ignition
FLAME FLAME
MV STATUS MV STATUS
Status LED Status, MV
Flashes LEDs On
Ignition Trial Timer
4 - 15 Seconds
On On
On On
On On
On
On
Section: SEQUENCE OF OPERATION
For Low Fire Start the operation
sequence is the same for the
Run End Call for Heat
FLAME FLAME
MV STATUS MV
Status, MV, LEDs Off
Flame LEDs On
On
On Off
On
Off Off
On Off
STATUS
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