Blocked Vent And Flame Roll-Out System - Lochinvar 000 - 500 Installation And Service Manual

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 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 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 lo ca tion 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. 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.
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.
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