Vent Damper Installation
(Models 133 Through 261) Where Required
Location
The vent damper must be located in the vent so that it serves only the appliance for which it is intended.
If improperly installed, a hazardous condition, such as an explosion or carbon monoxide poisoning, could result. Make certain that it is mounted in an accessible location at least 6 inches from any combustible mate- rial or the heat exchanger, and that the position indicator is in a visible location.
The vent damper must be installed after the appliance
On vertical vents, the vent damper may be mounted with the actuator in any position. On horizontal vents, do not mount the actuator either directly above or directly below the vent pipe; mount the vent damper actuator to the side of the vent.
The vent damper is set up for a continuous pilot sys- tem. If the vent damper is installed on an Intermittent Pilot or Direct Spark Ignition equipped system, the energy savings of the vent damper can be improved by plugging the hole in the vent damper blade using the knockout plug, Part No. 105612R, provided in the parts envelope.
DO NOT plug the hole if installing the vent damper on a continuous pilot system as this will create a hazard.
HORIZONTAL INSTALLATION
drafthood, as close to the drafthood as practicable, and without modification of the drafthood.
FLOW >
TO BOILER | D80B |
VERTICAL INSTALLATION
TO CHIMNEY
TO CHIMNEY
NO
YES 
YES
NO
INSTALL VENT DAMPER WITH ACTUATOR TO SIDES OF VENT ONLY. DO NOT MOUNT ABOVE OR BELOW VENT.
ACTUATOR MAY BE INSTALLED IN ANY POSITION ON VERTICAL PIPE
VENT DAMPER
TO BOILER
Fig. 17: Vent Damper Installation (Model 133 Drafthood
Shown)
WARNING: Do not use thermally actuated vent dampers on a modulating boiler. To do so may result in asphyxiation. Use only a mechanically actuated vent damper device that is electrically interlocked with the modulating boiler operation.
Fig. 18: Horizontal/Vertical Vent Damper Installation
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| N. O. | N. C. |
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| END | 1K2 |
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| SWITCH |
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| C. | 1K1 |
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| R |
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| 1R |
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| 1 | 2 | 3 | 4 | 5 |
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BLACK | ORANGE | RED | YELLOW | BLUE |
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| LIMIT | OPTIONAL LIMIT |
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| LOCATION |
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| CONTROLLER |
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| (HOT) |
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| DUAL VALVE |
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| L2 |
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| COMBINATION |
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| 1 | |
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| GAS CONTROL OR |
| TRANSFORMER | ||
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| IGNITION SYSTEM |
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1 | POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED | |||||
Fig. 19: Vent Damper General Wiring Diagram
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