Lochinvar 260000, 45000 service manual Blocked Vent and Flame Roll-Out / Flame Interlock Switch

Installation & Service Manual

5Electrical connections (continued)

Blocked Vent and Flame Roll-Out / Flame Interlock Switch

BLOCKED VENT SWITCH

INVERTED TO SHOW RESET

UNDERNEATH

DRAFT HOOD

Figure 5-7_Blocked Vent Switch Location

OUTER AIR

DEFLECTOR

UPPER FRONT

JACKET PANEL

FLAME ROLL-OUT SWITCH /

DETAIL A INTERLOCK SWITCH

LOWER FRONT

JACKET PANEL

HEX FILLER BRACKET

Figure 5-8_Flame Roll-Out / Flame Interlock Switch Location

All units are equipped with manual reset blocked vent and flame roll-out / flame interlock switches. These temperature switches are located in the controls compartment and in the relief opening of the boiler’s built-in draft hood. Each switch has a red reset button. In the event the system has actuated to shut off the main burner gas supply, wait for the boiler to cool, then press the red reset to return the boiler to operation. Operation of a blocked vent and/or flame roll-out / interlock switch usually indicates a problem with the venting system, obstruction of the heat exchanger flue gas passageway and/or a combustion air supply problem. The cause for operation of the blocked vent and/or flame roll-out / interlock switch must be determined and corrected. If the boiler cannot be restored to normal operation, contact a qualified service installer, service agency or the gas supplier.

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