I-OH (01-20) PN120390R7
17
Barometric Draft Regulator (Option DB1)
NOTE:
• Option DB1 (barometric draft regulator, see
) is required in Canada. Option DB1 or
equivalent is required in the US.
• Do not install a barometric draft regulator if the installation includes an optional outside combustion
air inlet (option DE1).
Figure 10. Barometric Draft Regulator (Option DB1)
• Canadian installations:
option DB1 is required and must be installed near the heater flue outlet. The preferred
mounting location for the draft regulator is in the vertical flue pipe (see
). Depending on the venting
arrangement, the alternate location for installing the draft regulator is in the horizontal run. Follow the manufacturer’s
instructions included with the draft regulator.
• US installations:
a UL-listed type barometric draft regulator such as option DB1, must be installed in the flue
near the heater flue outlet. The preferred mounting location for the draft regulator is in the vertical flue pipe (see
horizontal run. Install the draft regulator according to the manufacturer’s instructions.
Draft Inducer Relay (Option DH1)
•
A relay (Option DH1) is available for connecting a field-supplied UL-listed (US installations) or CSA/ULC-listed
(Canadian installations).
•
A draft inducer is required when the draft in the flue measures less than 0.04 IN WC on a draft gauge. Refer to
section for instructions for measuring draft.
•
When a draft inducer is installed, the safety provision must be made to shut off the fuel supply to the burner in the
event of the failure of the draft inducer. See the optional exhaust flow safety switch on the wiring diagram.
Outside Combustion Air Intake Adapter Kit (Option DE1, Shipped Separately)
•
A UL-listed outside combustion air intake adapter kit (option DE1) is available to provide outside air for combustion.
•
Option DE1 is not available for Canadian installations.
•
for installation and follow the manufacturer’s instructions furnished with the kit.
