Table 4-1. Preventive Maintenance Checks and Services.
B - Before operation
A - After operation
M - Monthly
D - During operation
W - Weekly
Q - Quarterly
Item to be inspected
Inspect for broken, cracked or dirty level.
Fuel pump and
Inspect for cracked and leaking pump and
filter. Check for improper alinement and
loose mounting of the pump and filter.
Inspect for broken and leaking exhaust pipe.
Check inside the duct for any foreign matter
Inspect burner electrodes for improper spark
and nozzle and gap. Electrodes should be set for a
5/ 32-inch gap. Check burner nozzle for
Burner head and air
Inspect for broken and cracked burner head.
Check for dirty and corroded air hose.
Inspect for cracked, broken and leaking relief
Army Models 41,
44, 45, and York-
Water heater tank.
Inspect for dented, broken, cracked, and
instruction plate for broken welds. Inspect
for cracked, broken, and corroded
Check for broken controls and instruments.
During operation, check for looseness and
Normal operating temperatures and
pressures for the instruments are as follows:
Water temperature gage -
Fuel pressure gage -
Low fire: 5 psi
Medium fire: 60 psi
High fire: 100 psi
Inspect motors for loose mounting and any
obstructions to ventilation.
Water pump water
Inspect for cracked, broken, dirty, and
Note 1. Ground
Before operational test, check for proper
ground. A proper ground will consist of a 3/4
inch diameter hallow rod or a %s inch
diameter solid rod. The cable will be 6 AWG
copper wire, bolted or clamped to the rod,
and attached to the ground terminal of the
Note 2. Fire
Before operational test, inspect for broken seal.
Note 3. Opera-
Observe for any unusual noises or vibration
tional test during operational test. Check fuel line and
water hose assemblies for leaking, electric
motors for overheating and shower nozzles
for improper spraying.
Note 4. Adjustment
Inspect fuel pump for proper pressure
adjustment during operational test.
Inspect for dirty strainer. Check for proper
Note 5. Suction
positioning of strainer during operational