TM 5-4520-208-15
(7) Install exhaust stack and air outlet
(1) Drive the ground rod (7, fig. 54) into
covers.
ground to insure a proper ground.
c. Electric Motor Power Unit.
(2) Connect ground clamp (13) to ground
(1) Open access door on top of cabinet.
rod.
(3) Connect electrical clip (14) to one end
(2) Stop electric motor power unit by
of electrical wire (9). Connect other
moving ON-OFF switch lever (fig. 8)
end of wire to ground clamp.
to OFF position.
(4) Connect electrical clip to heater and
(3) On Model BT400-40 heaters, remove
insure a metal to metal contact is
the cabinet (fig. 1) by disengaging
made.
latches.
(5) Connect electric motor cable to 208-
(4) On Model BT400-40-1 heaters, disen-
220 volt, 60 cycle, three-phase power
gage cabinet latches and open cabinet
source.
(6) Place ON-OFF switch lever on electric
(5) Perform the necessary daily preven-
motor (fig. 8) in ON position.
tive maintenance services (para 44).
Note. Motor must rotate in counterclock-
(6) Secure cabinet in closed position using
wise direction when facing motor shaft.
cabinet latches.
Interchange two motor leads if direction of
(7) Install exhaust stack and air outlet
rotation is clockwise.
covers.
(7) After power unit is started, secure
cabinet in closed position using cabinet
34. Operation Under Usual Conditions
latches.
(8) Open air inlet door (fig. 1).
a. Start the Heater. Refer to paragraph 32
and start the heater.
d. Starting the Heater Combustor.
b. Operate Heater.
(1) Depress fuel control valve knob (fig.
(1) With the heater operating and the air
(2) Set temperature selector valve to de-
inlet door open, refer to paragraph 13
sired temperature.
and connect the ducts to the heaters as
required.
33. Stopping
(2) Set damper control (fig. 13) to full
open position, with handwheel all the
a. Heater Combustor. Pull fuel control valve
way to the right (when facing the dis-
knob (fig. 11) to stop heater combustor.
charge end ).
Note. Allow the power unit to operate for two min-
(3) Rotate temperature selector valve
utes after fuel control valve is shut off.
knob (fig. 11) to desired discharge
b. Gasoline Engine Power Unit.
temperature.
(1) Open access door on top of cabinet.
(4) Regulate damper control (fig. 13) to
(2) Stop gasoline engine power unit by
the desired volume.
setting stop switch lever to the OFF
(5) The heater should attain the desired
position.
discharge air temperature in two min-
(3) On Model BT400-40 heaters, remove
utes. Due to a lag in operation of the
the cabinet (fig. 1) by disengaging
discharge air temperature gage (fig.
latches.
(4) On Model BT400-40-1 heaters, dis-
be indicated for a few more minutes.
engage cabinet latches and open cab-
(6) If temperature gage does not indicate
inet (fig. 1),
the desired temperature within 5 min-
(5) Perform the necessary daily preven-
utes, adjust the temperature selector
tive maintenance services (para 44).
valve knob as necessary, to obtain the
(6) Secure cabinet in closed position using
required discharge air temperature.
cabinet latches.
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