Dunkirk EXCELSIOR EXB5115 Aanvullende instructies - Pagina 7

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Blocked Vent Safety Shut Off System (BVS)

Direct vent Boiler is equipped with Blocked Vent Safety shut

off system (BVS). Safety circuit shuts burner off in event of

combustion air blockage or venting blockage.

It is best to have burner shutter and or head settings close

to Table 2 or 3.

Beckett NX

BVS pressure switch is wired in series with CAD cell. See

Wiring Diagram, Figure 12.

Riello 40BF

BVS pressure switch is wired in series with terminals 10

and 11 on 530SE control. See Wiring Diagram, Figure 13.

Blocked Vent Safety Switch Pressure Tubing

Connections

Check tubing connections on all Boilers prior to firing unit.

Beckett NX has low and high side tube, vacuum side goes

to air intake box, pressure side goes to overfire pressure

probe. See Figure 11.

Riello BF low pressure side is open inside air tight burner

cover and high pressure side goes to overfire pressure

probe.

Verify burner cover is air tight and all hole plugs are in

place.

Oil Burner Operation

Once Boiler flue pipe and intake pipe are completely in-

stalled. In absence of burner manufacturer's instructions,

use following instructions to set burner:

• Shut off electrical power to Boiler.

• Install oil pressure gauge to pressure port on oil pump.

(Riello requires special adapter)

• Check air settings for initial firing in Table 2 or 3.

• Restore electrical power to Boiler.

• Start Boiler. Bleed all air from fuel oil lines.

• Close purge valve and fire unit.

• When Boiler has reached "steady state" (after

approximately 5 minutes), remove bolt (test port) from

center of Appliance Adapter to Boiler.

• Set combustion air control to get TRACE to ZERO

smoke.

BLOCKED VENT SAFETY SHUTOFF SYSTEM

Beckett NX Burner:

Refer to Table 2. Select head setting according to required

firing rate. Final adjustments are required once burner is

started.

Final Adjustments

• Tighten lock nuts and screws before making

measurements.

• Using suitable testing instruments for CO2 (or O2),

measure combustion products. CO2 in the stack should

be minimum of 12% CO2 at a trace of smoke. For

clean operation of burner, open air control to introduce

enough excess air into the system to reduce CO2 by

10% of original trace point.

EXAMPLE: 12% CO2 minus 1.2 (which is 10% of 12)

equals 10.8% CO2).

Riello 40BF Burner:

Refer to Figure 10. Check initial air shutter and head

settings. Remove burner cover and turn air shutter

adjustment screw (2) until top edge of air shutter (3) is in

alignment with corresponding number in Table 3.

Riello burner pressure gauge threads are British

Parallel Thread design. Test gauge with NPT fitting

ruins pump body. Use Riello pressure gauge or

adapter.

Further adjustments must be made with burner cover in

place by unscrewing plug on cover. Turn screw clockwise to

increase combustion air or counter clockwise to decrease

combustion air.

• Shutter final position will vary on each installation.

• Use instruments to establish proper settings for

maximum CO2 and smoke spot reading of zero.

• Re-insert plastic cap over air adjustment hole before any

measurements.

NOTICE

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