Installation & Service Manual
17
The vent damper is a useful tool for saving energy when
installed inside the living space where air can cir cu late freely
around the appliance. The vent damper will not save as
much, if any, energy if it is installed in locations such as:
- Unheated garage
- Attic
- Crawlspace
- Mechanical room that is vented outdoors
For installation and maintenance on the vent damper, refer to
the instructions supplied with the vent damper.
Residential heating boilers with inputs of less than 300,000 Btu/hr
must have the vent damper prop er ly installed and the vent
damper wire harness plugged into the ter
mi
nal block on
the side of the control panel to allow the boiler to function.
Larger input heating boilers will have a jumper plug installed
in the ter mi nal block to allow operation without a damper.
Remove the jumper plug from the terminal block to connect
an optional vent damper wire harness. The jumper plug
MUST be in place if an optional vent damper is not used on
larger input heating boilers.
CAUTION
Do not install the vent damper within 6"
(152 mm) of combustible materials.
Install the vent damper to service only the single ap pli ance
for which it is intended. If improperly installed, a hazardous
condition such as an ex plo sion or carbon monoxide poisoning
could result.
The damper position indicator must be in a visible lo ca tion
with access for service following in stal la tion. The damper
must be in an open position when appliance main burners
are operating.
The part number for the automatic vent damper required on
this heating boiler is printed on the rating plate. Vent damper
regulations are design certified per the latest edition of ANSI
Z21.66.
VENT DAMPER
Figure 2-7_Vent Damper and Vent Damper Terminal Block
WARNING
The vent damper must be installed directly
on the flue outlet located on the top of the
draft hood (see FIG. 2-7). Do not alter
the wire har
ness sup
plied with the vent
damper. Follow the instructions supplied
with the vent damper.
CAUTION
An appliance which is shut down or will not
operate may experience freezing due to con vec tive
air flow down the flue pipe connected to the
unit. Proper freeze protection must be pro-
vid ed, see
Freeze Pro tec tion
.
Automatic Vent Damper
This heating boiler is design certified for use with the
automatic vent damper (FIG. 15) part number printed on
the boiler’s rating plate. A vent damper must be installed
on all residential heating boilers with inputs of less than
300,000 Btu/hr to comply with minimum efficiency
requirements. A vent damper is factory supplied with
residential heating boilers with inputs of 45,000 - 260,000 Btu/hr.
2
Venting
(continued)
Summary of Contents for CBN045
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