Install Instructions

5 Electrical connections (continued)
41
Installation & Service Manual
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 tem per a ture ex ceeds this setting, the limit
will break the control circuit and shut down the unit. The
limit control can only be reset after the water tem per a ture
has cooled well below the setting of the lim it. Reset of the
limit con trol is accomplished by push ing the Red Reset
But ton (Manual Reset High Limit) (see FIG.’s 5-2 and 5-3
on page 36) located on the front side of the control panel. A
label on the control panel indicates the exact lo ca tion of the
manual reset high water temperature limit control.
BLOCKED VENT SWITCH
INVERTED TO SHOW RESET
UNDERNEATH
DRAFT HOOD
FRONT OF UNIT
Figure 5-8_Blocked Vent Switch Location
DETAIL
HEX FILLER BRACKET
FLAME
ROLL-OUT SWITCH /
INTERLOCK SWITCH
UPPER FRONT
JACKET PANEL
LOWER FRONT
JACKET PANEL
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.
Op er a tion of a blocked vent and/or flame roll-out / interlock
switch usually indicates a problem with the venting system,
obstruction of the heat ex chang er flue gas passageway and/or
a combustion air supply prob lem. 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 ser vice in stall er, service
agency or the gas supplier.
Blocked Vent and Flame Roll-Out / Flame
Interlock Switch