Dunkirk EXCELSIOR EXB5100 Supplemental Instructions - Page 14

Browse online or download pdf Supplemental Instructions for Boiler Dunkirk EXCELSIOR EXB5100. Dunkirk EXCELSIOR EXB5100 20 pages. Direct vent high efficiency oil-fired hot water boiler

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NX Burner With Blocked Vent Safety (BVS) Operation

External Action

Power applied to burner control

Thermostat Calls For Heat

Call for heat is satisfied.

Reset button pushed two times

without device completing a call for

heat.

GeniSys 7505 Reset Button Operations

Pushing the reset button in the current state will cause the following conditions:

If the burner state is:

Lockout

Valve On Delay, Trial For

Ignition, Ignition Carryover

Run (igniter is shut off)

Motor-Off Delay, Standby

Pump Prime

Status Lights

Light Color

Red

Green

Yellow

OPERATION AND TROUBLESHOOTING

Appliance Response

Internal safety check conducted. If no light or flame is detected and all internal conditions are correct,

control enters idle mode.

1. Contacts between T and T on Aquastat L7248A are closed.

2. Burner Control period (4 seconds) internal and external check for flame or light. If flame is detected, control remains in

idle mode.

3. When flame is not present, Burner Control will apply power to the burner motor and igniter, complete a 15 second

valve on delay period and then apply power to the oil valve circuit.

4. Burner Control enters the trial for ignition period.

A. Monitors burner for flame.

B. When flame is not detected:

I. Enters lockout mode after 15 seconds.

II. Shuts off valve, igniter and burner motor.

III. Flashes indicator light at 1 Hz (½ second on, ½ second off).

IV. Depress reset button to return to power up sequence.

C. When flame is detected, Carry-Over period begins:

5. Burner Control enters 10-second Ignition Carry-Over period.

A. Turns on indicator light

B. If flame is lost and lockout time has not expired, Burner Control returns to trial for Ignition period.

C. If flame is lost and lockout time has expired, Burner Control enters Recycle Mode.

6. Carry-over time expires and igniter turns off.

7. Enters a run mode:

A. Flame is monitored until call for heat ends or flame is lost. If flame is lost:

B. Control enters Recycle Mode.

I. Recycle time starts (60 seconds).

II. Burner and valve are turned off.

III. Indicator light flashes at ¼ Hz (2 seconds on, 2 seconds off).

IV. Returns to Idle mode at end of Recycle mode.

1. Oil valve circuit is de-energized and valve shuts off.

2. Burner motor runs for selected post purge time.

3. Burner motor turns off.

4. Burner Control returns to Idle mode

1. Burner Control enters restricted mode.

2. Indicator light flashes 1 Hz (½ second on, ½ second off).

3. Reset device by pressing and holding reset button for a minimum of 45 seconds.

Pushing the reset button < 1 second

Reset from Soft Lockout

Pump Prime

Yellow light flashes to indicate cad cell

resistance.

No action

On Continuously

Restricted (Hard) Lockout

Flame Sense during normal operation.

May be stray light during standby.

Control is in Pump Prime mode OR

reset button is currently held for >15

seconds.

Pushing the reset button > 1 second

Disable the Burner. Any time the

burner is running, press and hold the

reset button to disable the burner. The

burner will remain off as long as the

button is held.

Exit pump prime mode and return to standby.

Flashing

Soft Lockout

Recycle

Cad cell resistance.

Push, hold reset button >15

seconds

Reset from Restricted (Hard)

Lockout

Enables pump priming: After the

reset button has been held for 15

seconds the button can then be

clicked during the next ignition

sequence to enter pump prime

mode.

P/N 240009355, Rev. C [11/15/2015]