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5 Electrical connections (continued)
39
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 34) 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