(1) Energize the electrical system for either internal or external
(2) Switch the R4, R5, and R6 circuit breakers (fig. 2-4) ON. This
energizes the R4, R5, R6, and other 240-volt, single-phase
Section II. OPERATION OF AUXILIARY MATERIEL USED IN
CONJUNCTION WITH THE SHOP SET
FIRE EXTINGUISHER (CARBON DIOXIDE TYPE).
The carbon dioxide type fire extinguishers are suitable
for electric and flammable liquid fires. The carbon dioxide types are
of the 4-pound, 7-1/2 pound, and 15-pound sizes. The 4-pound
extinguisher is portable; the others are the fixed type.
Operation. Remove the fire extinguisher from its location, break the
seal, operate the control valve, and direct the stream at the base of
Maintenance. For maintenance of the fire extinguisher, refer to
For starting and stopping instructions, refer to fig-
Section III. OPERATION UNDER UNUSUAL CONDITIONS
2-8. OPERATION IN EXTREME COLD.
Engine and Air Compressor. Refer to current lubrication order for
cold weather lubrication instructions.
Dynamotor-welder. When the dynamotor-welder is driven by the
shop set engine during extremely cold operating conditions, allow a
warming-up period to allow the engine to reach normal operating
temperature range before operating the dynamotor-welder.
Wiring Do not attempt to service or move the wiring during extreme-
ly cold temperatures. Bending a wire under these conditions will
cause cracks and breaks in the insulation and the wiring itself,
since cold temperatures make wiring brittle.
Cooling System. Make sure the coolant is treated for the lowest
possible ambient temperatures to be encountered. Refer to TB 750-651.
Clean and flush the cooling system before adding the initial anti-
freeze mixture. Make sure the thermostats are in proper working