Fan Limit Switch Settings - FireLake 155 Owner's Manual

FAN LIMIT SWITCH SETTINGS

DIAL WHEEL
90° F, 120° F, AND 200° F SET POINTS
Similarly operating White Rogers and Honeywell fan limit controls respectively shown above. The
manual selector switch should be at AUTOMATIC for heating applications. MANUAL setting
can be used for constant air circulation with or without burner operation.
1. As the burner fires the heat exchanger temperature rises. The fan control starts the blower
motor at 120° F and sends heated air into the room.
2. After the burner cycles off the heated air will gradually cool to 90° F, the fan limit switch
will open and cut power to the blower motor.
3. If there is a malfunction and the heated air reaches 200° F, the control will cut the burner's
power (amber light goes out) but the blower will continue to run trying to cool the
exchanger. This is a problem that needs corrected. It may be due to excessive restriction
of heated air from the heater, a failed blower motor, obstructed blower inlet, or too much oil
being fired in the chamber. Once the heated air is cooled sufficiently the burner will be
allowed to get power again (amber light on) and fire.
until the problem is corrected or the room thermostat stops calling for heat
4. The 90°F and 120°F settings can be adjusted if there is unusual cycling of the blower.
maintain warranty, consult your dealer on how to do this and get the flame sized properly.
HAS EXTRA AIR SOLENOID AND TIMERS
MANUAL SELECTOR SWITCH
Page 35 of 35
200° F, 120° F, AND 90° F SET POINTS
This process will cycle repeatedly
DIAL WHEEL
To