Table 4-2. Troubleshooting--Continued
TEST OR INSPECTION
Step 5. Inspect and test for a defective sump pump as follows:
Pump is considered defective if it does not meet the standards of the test.
a. Remove cover from drain sump (3) (fig. 4-11 and fill with water.
b. Close centrifugal sump circuit braker located on electrical distribution panel assembly.
c. Float switch inside tile sump assembly (3) shall energize the pump motor and discharge water from sump
d. Float switch shall shut off pump (7) when approximately two inches (5.08 cm) of water is remaining in
sump (3). The remaining water will drain by gravity.
Replace a defective pump as follows:
a. Removal. Remove damaged or defective pump assembly according to sequence of index
(1) Disconnect inlet and outlet lines from pump (7, fig. 4-11) located Inside water service inlet
(2) Disconnect electrical connector from end of pump (7).
(3) Remove nuts (4) and %washers (5) securing the pump to the pump mounting bracket.
(4) Loosen and slide off clamp (6) securing pump (7) to pump mounting bracket.
(5) Remove pump (7) from water service inlet box.
Be sure electrical source is off before connecting electrical leads.
(1) Position pump (7, fig. 4-11) in proper position and secure with nuts (4) and washers (5).
(2) Slide clamp (G) over primp (7) and pump mounting bracket and tighten securely.
(3) Connect electrical connector to end of pump.
(4) Connect inlet and outlet lines to pump (7).
Check for tripped (out of set position) water tunnel heater or drain hose heater receptacle circuit breaker
(shelters used in areas having ambient temperature below 38F. (3C.)only). Check, also. For overload
condition and shorts using a multimeter or other checking device (para 11-2).
Reset circuit breaker by pushing reset button on control panel. If the circuit breaker will not stay set
correctly, report the condition to Direct Support 'Maintenance for removal and replacement.
Check for defective (worn, deteriorated) drain hose heater.
Report defective drain hose heater to Direct Support Maintenance.
NO VACUUM INSIDE SHELTER
Check to insure external vacuum source is connected.
Check connection to vacuum Inlet.
Section VI. RADIO INTERFERENCE SUPPRESSION
4-14. General Methods Used to Attain Proper
4-15. Interference Suppression Components
thru 3) are the only components which cause radio
Essentially, suppression is attained by providing a
methods used include shielding the ignition and high
reduction requirements of MIL-STD-461A for tactical
Change 1 4-61