Blocked Vent Safety Shutoff System - Slant/Fin Q3-4 Supplemental Instructions

Blocked Vent Safety Shut Off System (BVS)
Oil burners used with this direct vent boiler are equipped
with a Blocked Vent Safety shutoff system (BVS) utilizing
a pressure switch that is part of the oil burner. This safety
device shuts off the burner in the event of combustion air
blockage or venting blockage. Do not use blocked vent
safety switches that are designed for use with chimney
vent boilers on direct vent installations.
It is best to have burner shutter and or head settings close
to Table 2.
Riello 40BF
BVS pressure switch is wired in series with terminals 10
and 11 on 530SE control. See Wiring Diagram, Figure 10
page 11.
Blocked Vent Safety Switch Pressure Tubing
Connections
• Check tubing connections on all Boilers prior to firing
unit.
• 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.
• 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 ap-
proximately 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

Riello 40BF Burner:
Refer to Figure 9. 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 2.
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.
7
NOTICE
P/N 473921000