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 TM 55-1905-219-14-8
MACERATOR/TRANSFER PUMP TIMER AND SELECTOR SWITCH -
MAINTENANCE INSTRUCTIONS.
Whenever a commode or urinal is flushed, a micro-switch or flow switch closes and completes the circuit
of a control relay (CR) and a time delay (delay on operate) relay (TD). The coil of relay (CR) becomes
energized and closes contact CR. This set of contacts maintains power on the coils of the control relay and the
time relay after the microswitch or flow switch opens. Contact CR also energizes the coil of the magnetic motor
starter which in turn starts the macerator/transfer pump. When the time delay relay completes its timing cycle,
normally closed contact TD opens and interrupts the power to the coils of the control relay and the time delay
relay. Simultaneously the power to the coil of the magnetic motor starter is interrupted and the
macerator/transfer pump is turned off. The length of the operating cycle is controlled by a resistor in the time
delay relay circuit. For a 10 second cycle the required resistance is 220 K ohms.
This task covers:
a.
Inspection
b.
Replace
INITIAL SETUP
Test Equipment
References
NONE
NONE
Equipment
Special Tools
Condition Condition
Description
NONE
NONE
Material/Parts
Special Environmental Conditions
NONE
Tag water closets and urinals -
SECURED
Personnel Required
General Safety Instructions
2
Observe WARNINGS in paragraph 4-15
and in this procedure.
4-678
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