REMOVAL AND INSTALLATION OF MAJOR COMPONENTS AND ASSEMBLY
(2) Light the burner in accordance with in-
(3) During the test, operate the heater with the
temperature control valve set at the high heat
(4) After heater has been in operation for fifteen
minutes, place an obstruction over both discharge
openings of heater.
(5) Observe the thermometer; also observe the
flame height through the observation glass in the
burner access door.
(6) When the thermometer indicates a" tem-
perature within the range of 280 to 300F, the
overheat safety valve should close, thus reducing the
flame height to low flame. If the valve fails to close
at 300F, this indicates that the valve is un-
serviceable and requires replacement.
Do not attempt to disassemble or reset. It is preset at
Figure 5-1. Overheat control, removal and installation.
(2) Install the cabinet.
General Burner Assembly
b. Testing. Follow the procedure below for per-
The burner is constructed of heavy gage steel and
forming the serviceability test for the overheat safety
cast iron. The burner pot is designed to hold the bur-
ning fuel without allowing it to flow into the air
(1) Use a dial thermometer having a 24-inch
chamber. The burner also has drain tubes which
length capillary, and within the temperature range
allow any excess fuel to drain from the burner pot.
of 200 to 315F. Mount the thermometer on the
The drain tubes are below the fire level so the ex-
right side of the heater and attach by wiring the sen-
pelled fuel will not be ignited by the flames in the
sing element of the thermometer to the overheat
burner. The air chamber completely surrounds the
safety valve bulb. If a suitable thermometer is not
bottom of the burner, thus allowing the air from the
available within the organization, requisition FSN
blower wheel to flow evenly into the burner.