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5 Electrical connections (continued)
39
Installation & Service Manual
Blocked Vent and Flame Roll-Out / Flame
Interlock Switch
BLOCKED VENT SWITCH
INVERTED TO SHOW RESET
UNDERNEATH
DRAFT HOOD
FRONT OF UNIT
Figure 5-7_Blocked Vent Switch Location
HEX FILLER BRACKET
OUTER AIR
DEFLECTOR
DETAIL A
FLAME ROLL-OUT SWITCH
/
INTERLOCK SWITCH
UPPER FRONT
JACKET PANEL
LOWER FRONT
JACKET PANEL
Figure 5-8_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.