TM 10-4510-209-13&P
0057 00
Replace the Pressure Switch
WARNING
Always secure and tag circuit breakers in the OFF position or disconnect equipment's
power cord from receptacle before attempting any electrical repairs, even minor repairs
such as replacing a light bulb. The latrine is a wet environment capable of posing an
electrical shock hazard when personnel have direct contact with energized wires or metal
parts. Failure to observe this safety warning may result in serious injury or death to
personnel.
CAUTION
Failure to disconnect power from the water heater may result in a burnt out element.
1. Ensure the water heater circuit breaker #2B (1) and water pump circuit breaker #9/11 are set to the
OFF position.
2. Disconnect the water pump cord (2) from the water pump outlet (3), and relieve pressure on the
system by opening the faucets until there is no water flow.
3. Remove the screws retaining the pump cover (4), and remove the cover.
4. Remove the pressure switch hose (5) from the TEE (6).
5. Remove the pressure switch hose (5) from the pressure switch (7).
6. Remove the pressure switch cover (8).
7. Tag and disconnect all wires in the pressure switch (7).
8. Remove the locknut (9) on the conduit for the power cord (2), and remove the power cord.
9. Remove the locknut (10) on the conduit for the pump motor (11), and remove the pressure switch (7)
from the conduit.
10. Install the replacement pressure switch (7) onto the conduit leading to the pump motor (11), and
retain with conduit locknut (10).
11. Install the power cord conduit (2) onto the pressure switch (7), and retain with locknut (9).
12. Wrap the male end of the pressure switch hose (5) with three turns of antisieze tape, and install on
pressure switch (7).
13. Reconnect the female end of the pressure switch hose (5) onto the pipe TEE (6).
14. Install pressure switch cover (8), and retain with cap nut.
15. Install the pump cover (4), and retain with screws.
16. Prime water pump, and operate in accordance with procedures outlined in WP 0009 00, and monitor
for normal operation.
17. Reconnect power cord (2) to outlet (3), set water heater and water pump circuit breakers to the ON
position, and restore electrical power and water supply to CLS.
0057 00-24