2-17. Operation Under Rainy or Humid
wiring during extremely cold temperatures.
Conditions
Bending a wire under these conditions will cause
cracks and breaks in the insulation and the wiring.
a. General. Provide adequate ventilation and
d. Fuel System. Fuel tank should be kept as full
shelter to protect the shop set from rain and
as possible at all times to reduce the possibility of
h u m i d i t y . Remove any coverings during dry
moisture forming in the tank. Keep the fuel tank
periods to aid in drying out the shop set and
filler cap and screen free from ice and moisture.
components.
b. Fuel System. Keep fuel tank full to avoid
condensation in the tank.
a. Lubrication. Refer to current lubrication order
c. Dynamotor-Welder. Do not attempt to weld in
and lubricate with specified lubricants only.
the direct presence of rain or when condensate is
b. Dynamotor-Welder. Check the dynamotor-
forming on metal parts in an extremely humid
welder air filters frequently. Clean, ventilating air
atmosphere.
filters are necessary to maintain maximum ven-
tilation through the dynamotor-welder at all times.
a. General. Wipe the exposed surfaces of the
body interior and exterior, as well as all component
a. General. Dust and dirt can cause premature
surfaces, with clean, fresh water. Be careful not to
mechanical failure of the shop set components.
containinate the fuel system or damage the elec-
L o c a t e the shop set in a well protected area,
trical system with the water.
whenever possible. Keep the shop set as clean as
b. Protection. Remove all rust and corrosion
possible, paying particular attention to the screens,
immediately. Coat exposed metal surfaces with
grilles, and filters. Use compressed air to clean, for
rust-proofing material and apply paint or oil as
best results.
required.
b. Lubrication. Strainers and filters will have to
be replaced more often than usual. Take care to
clean dust and dirt from the lubrication points
Operating difficulties at high altitudes result largely
before applying lubricant. Clean the area around
from the reduced density of the atmosphere. This
the oil filler cap and oil level gage before checking
affects the shop set primarily in regards to the
oil level' or adding oil.
ventilation a n d c o o l i n g o f c o m p o n e n t s . The
c. Fuel System. Take all precautions to keep the
dynamotor-welder A.C. and D.C. output are both
fueI and fuel system free from dust and foreign
rated at 12 K W at altitudes up to 5,000 feet, and
particles. Inspect the filter bowls more frequently
9.8 KW at 8,000 feet. To calculate either A.C. or
than under normal circumstances.
D.C. output above 8,000 feet elevation, use the
d. Dynamotor-welder. Inspect the dynamotor-
following formula: (Round off to closest tenth. )
welder filter screens frequently to keep dust and
dirt to a minimum.
FORMULA:
6 % x actual altitude
-5,000
5,000
ft
rating
=
derating
factor.
1,000
E X A M P L E SOLUTION FOR 11,000 FT.
12 KW = 4.32 derating factor
0.06
11,000 --5,000
x
1,000
12KW --4-3 KW = 7.7 K W output at 11,000 ft. altitude.
Section VI. OPERATION OF MATERIEL USED IN
CONJUNCTION WITH THE SHOP SET
For starting and stopping instructions, refer to
