Granby B*G-3, Инструкция по установке, эксплуатации и обслуживанию, Страница: 22 / 37

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8.0 ACCESSORY INSTALLATION
BLOCKED VENT SWITCH (BVSO) FOR CANADIAN APPLICATION ONLY
Gas-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. On gas-fired Boilers, the BVSO acts as a spill switch on the outlet of
the double acting draft-regulator.
NEVER reset the switch unless the cause of the blockage has been corrected.
Installation on Gas-Fired Boilers (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
Installation on Gas-Fired Heating Units (Figure 1)