Lochinvar 90, 500 service manual 5Electrical connections continued, Installation & Service Manual

Installation & Service Manual

5Electrical connections (continued)

Manual Reset High Water Temperature Limit Control

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

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 FIG.’s 5-2 and 5-3 on page 34) 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

BLOCKED VENT SWITCH

INVERTED TO SHOW RESET

UNDERNEATH

UPPER FRONT

JACKET PANEL

DETAIL

FLAME

ROLL-OUT SWITCH /

INTERLOCK SWITCH

LOWER FRONT

JACKET PANEL

HEX FILLER BRACKET

Figure 5-9_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.

DRAFT HOOD

Figure 5-8_Blocked Vent Switch Location

39