Lochinvar 000 - 500, 45 Blocked Vent and Flame ROLL-OUT/FLAME Interlock Switch, Initial START-UP

Manual Reset High Water Temperature Limit

Control (Standard Fixed Settings on Water Heaters and Optional Adjustable Settings on Boilers and Water Heaters)

Water heaters are supplied with a fixed setting, manual reset high water temperature limit control. This manual reset temperature limit control has a fixed limit setting of 230°F (110°C). If water temperature exceeds this setting, the limit will break the control circuit and shut down the unit. The limit control can only be reset after the water temperature has cooled well below the setting of the limit. Reset of the limit control is accomplished by pushing the Red Reset Button (Manual Reset High Limit) (see Figures 25 - 27 on pages 19 and 20) located on the front side of the control panel. A label on the control panel indicates the exact location of the manual reset high water temperature limit control.

BLOCKED VENT AND FLAME

ROLL-OUT/FLAME INTERLOCK SWITCH

FIG. 31 Blocked Vent Switch Location

FLAME ROLL-OUT SWITCH /

INTERLOCK SWITCH

FIG. 32 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.

INITIAL START-UP

Follow the Lighting Instructions on the label applied to the appliance.

A. On water heaters and boilers with the system pump delay option, the operating temperature control will energize the pump relay which energizes the pump on a call for heat. The operating temperature control will de-energize the pump relay approximately 30 seconds after the call for heat ends. If either the inlet sensor or the optional multi-purpose temperature sensor reads below 40°F, the pump relay will turn ON. When the temperature rises above 50°F the pump relay will turn OFF.

23