until the compressor unloads before
wise the heater air does not pass into the
engaging the pumps.
air cleaner.
(2) The contaminated air from the heater is
d. Setting of Dampers. Shift the hot air duct
exhausted by a heater exhaust tube (6,
dampers to direct heat output to heat the lubricant in
fig. 5) to the atmosphere through the roof
lubricant containers. By swinging the tube container hot
of the inclosure.
air damper up to the open position, and engine hot air
damper to the right into the closed position, heater
(3) The engine exhaust director handle (14,
output will be directed to the lubricant containers. A
fig. 9) directs exhaust gases through a
portion of the heat is also directed to the battery
hose to the atmosphere outside the unit,
compartment. There is no need to delay operation until
when heating of grease or oil is not
lubricants become warm since low-temperature
desired.
When the handle is in the
lubricants can be pumped.
vertical position it conducts exhaust gases
into the reservoir under the lubricant
Note
containers for heating of grease and oil.
The heat for the battery box is
automatically controlled by a control
c. Operation of Special Equipment.
switch and butterfly valve, located in
(1) Prior to cold weather operation (minus 25
the temperature control heating tube.
F. to minus 65 F.) shift the engine hot air
A sending unit, located in the rear of
damper (17, fig. 6) to open position by
the battery drawer, is connected to
swinging the control handle up, to direct
the switch by a capillary tube. The
heated air to the lubricant containers. A
portion of the heat is also directed to the
switch automatically opens the
battery compartment.
butterfly valve and admits heat to the
batteries when the air temperature in
(2) Start the heater (par. 62) and direct heat
the box drops to 30. The switch
to the engine air intake for 45 minutes, by
moving the engine hot air damper (17, fig.
closes
the
valve
when
air
6) into open position as described in
temperature in the box reaches 100.
64. Alcohol Dispenser
(3) Close all lubricating unit doors (15, fig. 1)
Use the alcohol dispenser (9, fig. 6) during cold
and louvers (14).
weather operation. The dispenser is used to inject
(4) After the end of the 45-minute warmup
alcohol into the air lines leading to the pumps to prevent
period start the engine (par. 48 or 49) and
condensate freezeup. It is equipped with an 8-ounce
allow the engine to operate for
capacity metal bowl and a handle needle valve which
approximately 10 minutes.
controls the flow of alcohol.
(5) After the engine has operated for 10
minutes, start the compressor and wait
Table IIl. Alcohol Dispenser Valve Setting
40 PSI
Valve
80 PSI
Valve
120 PSI
Valve
to
must be
to
must be
to
must be
pumps
opened
pumps
opened
pumps
opened
1 Pump
2 Turns
1 Pump
11/2 Turns
1 Pump
1 Turn
2 Pumps
11/2 Turns
2 Pumps
11/8 Turns
2 Pumps
3/4 Turn
3 Pumps
1 Turn
3 Pumps
3/4 Turn
3 Pumps
1/2 Turn
Note
For dispensing approximately 9-ounces per hour, operating one, two or three pumps. (With
pumps operating at 24 cycles per minute).
Note
Higher pump operating air pressure and faster cycling will automatically increase the amount of
alcohol dispensed, so that needle valve must be proportionately closed to maintain the desired
flow.
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