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TM 55-1905-223-24-7
i. High Pressure Regulating Valve. Behind the high pressure by-pass valve, and connected to the valve, is the high
pressure regulating valve (9, FIGURE 1-4, Sheet 2. This valve restricts flow downstream of the RO modules causing the
pump discharge pressure to rise to the factory set 800 psi. The bolt on top of the regulator adjusts the set point to
maintain this pressure
j. High Pressure Pump. The high pressure pump (10, FIGURE 1-4, Sheet 2) is a positive displacement low-volume
pump mounted in the left side of the watermaker on the resilient mounted plate which also supports the three-horsepower
pump motor. Dual pulleys and vee belts couple the two. The pump consists of a hydraulic enclosure which bolts to the
larger diameter pumping head. The stroking of three pistons within the hydraulic end is hydraulically applied to one side of
an associated buna-N diaphragm, displacing water on the opposite side of the diaphragm within the pumping head. The
upper port on the pumping head is the 3/4-inch inside diameter discharge port. The lower port is the 1-inch inside
diameter pump inlet.
k. High Pressure Pump Motor and Drive Belts. The three-horsepower, 60-cycle, three phase, 240 Vac pump motor
operates continuously when the POWER SWITCH is ON (up). The motor and pump are resiliently mounted in the left end
of the watermaker behind the louvered panel and belt guard. Power to the motor comes from the magnetic starter relay
(5, FIGURE 1-4, Sheet 1). Vee belts drive the pump through 3-to-1 speed reducing pulleys. Slotted holes in the pump
base allow adjustment of belt tension.
l. Low Pressure Gauge. The low pressure gauge (1, FIGURE 1-6, Sheet 1) is mounted on the dash panel to the
right of the product water flowmeter. The gauge senses pressure at the outlet of the micron filters. Scale readings are -30
psi to +15 psi (-100 kPa to +100 kPa). In normal operation, the gauge reads positive.
m. Power Switch. The main power switch (2, FIGURE 1-6, Sheet 1) energizes the two pump motors and energizes
the switch contacts on the water monitor POWER switch. The high pressure pump motor circuit energizes the elapsed
time meter.
n. Water Monitor Assembly. The water quality monitor is the upper right electronic enclosure (3, FIGURE 1-6, Sheet
1).The monitor panel shows cumulative hours running time plus red and green lamps to indicate water quality. Also on the
panel are a fuseholder, a power switch, and an alarm switch. The water quality monitor contains the circuit logic which
automatically saves only the potable water. This circuitry converts the conductivity input from the salinity probe into a save
or dump signal to the solenoid diversion valve.
o. Brine Flowmeter Assembly. The brine flowmeter (4, FIGURE 1-6, Sheet 1) is similar in appearance and function
to the product water flowmeter. This meter intercepts brine outflow from the RO modules before it enters the brine
manifold. The bring flowmeter reads 0 to 5 gallons per minute (gpm). Normal flow is 3.5 gpm.
p. EMERGENCY PROCDURE Label Plate. The EMERGENCY PROCEDURE label plate (5, FIGURE 1-6, Sheet 2)
on the left front louvered panel gives summary procedures for starting, operating, and securing the unit.
q. HI PRESSURE GAGE PG Label Plate. The HI PRESSURE GAGE PG2 label (6, FIGURE 1-6, Sheet 2) is located
as shown,
1-9

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