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HAS EXTRA AIR SOLENOID AND TIMERS
FAN LIMIT SWITCH SETTINGS
MANUAL SELECTOR SWITCH
DIAL WHEEL
DIAL WHEEL
90° F, 120° F, AND 200° F SET POINTS 200° F, 120° F, AND 90° 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. This process will cycle repeatedly
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. To
maintain warranty, consult your dealer on how to do this and get the flame sized properly.
Summary of Contents for 155
Page 21: ...Page 21 of 21 APPLIES TO ALL HEATER MODELS EXCEPT MODEL 500 ...
Page 23: ...Page 23 of 23 MODEL 500 HEATER ONLY 220 VAC FEED ...
Page 27: ...Page 27 of 27 K5 Burner w Air Pump 1 of 2 Burner Drawing ...
Page 28: ...Page 28 of 28 K5 Burner w Air Pump 2 of 2 Burner Drawing ...
Page 29: ...Page 29 of 29 B5 Burner Drawing ...
Page 30: ...Page 30 of 30 B5 Burner Drawing ...
Page 33: ...Page 33 of 33 120 VOLT MODEL B5 TWO STAGE w AIR DELAY BURNER WIRING ...
Page 55: ...Page 55 of 55 BLUE CABINET MODEL 235 ...
Page 63: ...Page 63 of 63 BURNERS ...
Page 65: ...Page 65 of 65 BURNERS CONTINUED ...