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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.
ƽ 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
ƽ 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.
ƽ 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 thru 260,000 Btu/hr.
2 Venting (continued)