Lochinvar 500, 90 Automatic Vent Damper, 7CB with Vent Damper and Vent Damper Terminal Block

2Venting

Automatic Vent Damper

This heating boiler is design certified for use with the automatic vent damper (FIG. 2-7) part number printed on the boiler’s rating plate. A vent damper is optional on heating boilers above 360,000 Btu/hr. Automatic vent dampers are not required or furnished on potable water heaters. Water heaters with inputs of 360,000 Btu/hr and less may be ordered with the vent damper as an option. A vent damper is a useful tool for saving energy when installed inside the living space where air can circulate 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.

Larger input heating boilers and water heaters will have a jumper plug installed in the terminal block to allow operation without a damper. Remove the jumper plug from the terminal block to connect an optional vent damper wire harness (water heater shown in FIG. 2_8). The jumper plug MUST be in place if an optional vent damper is not used on water heaters and larger input heating boilers.

Installation & Service Manual

Figure 2-7_CB with Vent Damper and Vent Damper Terminal Block

VENT DAMPER

TERMINAL

BLOCK

Figure 2-8_CW with Vent Damper

VENT DAMPER

￿WARNING

￿DANGER

Do not install the vent damper within 6" (152 mm) of combustible materials.

Install the vent damper to service only the single appliance for which it is intended. If improperly installed, a hazardous condition such as an explosion or carbon monoxide poisoning could result.

The damper position indicator must be in a visible location with access for service following installation. 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.

￿ 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 harness supplied 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 convective air flow down the flue pipe connected to the unit. Proper freeze protection must be provided, see Freeze Protection in the Startup Section of this manual.

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