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Please retain these instructions after installation.
This device MUST be installed by a qualifi ed agency in accordance with the manufacturer's installation instructions. The defi nition of
a qualifi ed agency is: any individual, fi rm, corporation or company which either in person or through a representative is engaged
in, and is responsible for, the installation and operation of HVAC appliances, who is experienced in such work, familiar with all the
precautions required, and has complied with all the requirements of the authority having jurisdiction.
READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY BEFORE PROCEEDING WITH THE INSTALLATION.
Installation Date:
Installed By:
Phone:
BLOCKED VENT SWITCH
Model: WMO-1
WARNING: Do NOT reset the device or restart the appliance unless the cause has been identifi ed
and corrected by a qualifi ed agency. Ensure the switch appliance combination has been cleaned by
a qualifi ed agency before placing back into service. Annual inspection and cleaning by a qualifi ed
agency is required.
• Wiring MUST be in accordance with the current Canadian Electric Code and any other applicable
federal, provincial and local code requirements.
• For installations in the USA, all wiring shall be in accordance with the National Electrical Code and
applicable local codes.
• For continued safe operation, the appliance-switch combination is required to be inspected and
maintained annually by a qualifi ed agency. Failure to properly maintain the appliance-switch
combination can lead to Death, Personal Injury and or Property Damage.
The WMO-1 Blocked Vent Switch is recommended for installation with an oil fi red appliance that normally
operates with its vent system under a negative pressure. This device is intended to detect a blocked vent
system, responds to hot fl ue gases backing up through its heat transfer tube, and can be wired to shut off
the oil burner. It requires manual resetting.
WARNING: Read the installation instructions carefully and completely before proceeding with
the installation.
ITEMS INCLUDED IN KIT
1 - Blocked Vent Switch Assembly
2 - 5/8” x 11 UNC Hex Jam Nuts
1 - Instruction Sheet
Summary of Contents for WMO-1
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