ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
REVERSE OSMOSIS SYSTEM
Replace either of the RO Feed Tank Heaters H-1 or H-2 as follows:
WARNING
The TWPS must be in Shutdown and the TQG and TWPS main breaker must be off
(Army) or the TWPS disconnected from its power source (Marine Corps) prior to
removing or installing an RO Feed Tank Heater. Failure to observe this warning
can result in injury or death from electrocution or damage to equipment.
1. Remove an RO feed tank heater from the tank as follows (see Figure 2):
a. Make sure the TWPS is in Standby Shutdown With Drain-Down.
b. Remove the four screws from the heater cap on the heater terminal box and remove the
cap.
c. Tag and disconnect the three phase wires and the one ground wire from the heater
terminals.
d. Unscrew the lock nut inside the terminal box from the 45-degree box connector.
e. Pull the connector and conduit as an assembly out of the terminal box. Retain the
packing/retainer.
f. Unscrew the heater from the tank heater coupling.
g. Pull the heater element out the tank.
HEATER ELEMENT
HEATER THREADS
HEATER CAP
RO FEED TANK
SCREW
MAIN DRAIN VALVE V-412
HEATER TERMINALS
LOCK NUT
PACKING/RETAINER
PHASE WIRES
GROUND WIRE
45 DEGREE BOX CONNECTOR
CONDUIT
Figure 2. RO Feed Tank Heater Replacement.
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