SL11B & S1500 Manual 934-6644 - Page 11
6 LACK OF PREVENTATIVE MAINTENANCE
Heaters must be cleaned as required, especially when used in a dirty
environment.
7 IMPROPER SUPPLY OF FRESH AIR
Recommended: Intake air for the heater be taken from outside the
enclosed area. This provides a slight pressurization and prevents any
problems associated with recirculation.
SAFETY FEATURES
Servicing of Sure Flame Construction Heaters normally involves one of
several built-in safety features. The Models SL11B & S1500 incorporate
devices to detect the following:
1 LOSS OF FLAME Gas supply is shut off if flame is lost to
prevent raw gas from leaving the heater.
2 OVERHEATING (a) Thermal overload protection in the
motor.
(b) High temperature limit switch in the
combustion chamber.
3 LOSS OF POWER Total shutdown with manual reset re-
quired. Any one of the safety devices will
create a loss of power situation.
4 BLOCKED AIR SUPPLY A switch detects the differential pressure
in the combustion chamber and shuts
down when insufficient.
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