Granby B*C-3 sections, Installation, Operation And Service Manual

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15
OIL TANK AND PIPING
COMBUSTION & VENTILATION AIR
Install openings and ductwork to the boiler room providing fresh out-side combustion
and circulating air, as installation code require by Canada CSA B139. If installed in a
closed room, provide two free air ventilation openings of at least 8’’ x 12’’ (96 sq in.) free
flow areas near celling and floor. Oil burners must have sufficient air to allow vent
system to operate properly.
8.0 ACCESSORY INSTALLATION
BLOCKED VENT SWITCH (BVSO) FOR CANADIAN APPLICATION ONLY
Oil-fired appliances installed in Canada require a blocked vent switch system when installed on
a chimney. A safety switch is included with the boiler to perform this function. It is the
installer’s responsibility to install the switch in accordance with the instructions provided. Not
applicable for Direct Vent systems. Field Controls Model: WMO-1 (Manual Reset)
Switch Operation
Blocked vent switches are flue gas safety devices for detecting spillage of flue gases due to a
blocked flue or inadequate draft. After detecting a problem, the switch de-energizes the
system’s burner control.
NEVER reset the switch unless the cause of the blockage has been corrected.
Installation (Figure 1)
1) Drill a 5/8” hole in to the flue vent pipe near the appliance breech connection.
2) This hole must be before the draft regulator, vertically or horizontally.
3) Remove one of the securing nuts from the threaded tube of the safety switch.
4) Tighten the other securing nut onto the pipe as far as possible.
5) Insert the threaded tube end into the pierced hole of the flue vent pipe.
6) Install the securing nut on the safety switch tube, which protrudes into the flue vent pipe.
Tighten the nut securely.
Figure 1-
Illustration Granby Industries
Figure 2- BVSO wiring diagram with L7248
Aquastat