Water Tec Int’l. Inc. Version 02A
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17.
TIME DELAY
Located inside of electrical system control box. The time delay is adjustable from 6-30 seconds. Its purpose is
threefold:
1) When the on-off switch is turned to “on” the time delay starts after the feed water pressure is sensed at the
low pressure switch and allows water to reach the high pressure pump before it turns on.
2) In the event of a momentary low-pressure condition, the R.O. unit will not cycle. The pump will turn off and
remain off until adequate pressure is restored.
3) If a true low feed condition should exist, the time delay will allow the existing pressure in the system to bleed
off and allow the low-pressure switch to activate before the R.O. unit cycles. Recommended setting is 15-30
seconds.
18. FUSE
Located on the electrical system control box. In units 30,000 GPD and above the fuse is located inside the
electrical system control box. Inlet line voltage routed through a 5 amp fuse and a 15 amp fuse for compacts.
19. LIQUID LEVEL CONTROL RELAY AND SWITCH
Connection leads are outside of the control box on the top or on the side. Its purpose is to automatically start
and stop the R.O. unit by a signal from the product water storage tank switch. This switch is included with the
R.O. unit. Many types and styles of liquid level switches are available at an extra cost.
NOTE: On single level control systems float operates off of the time delay relay.
20. INLET SOLENOID VALVE
This is a normally closed solenoid valve. This valve is located on the feed side of the pressure pump. Its
purpose is to shut off the feed supply when the unit is in the non-operating mode. If electrical power should fail
this valve will close, thus shutting off the feed water.
20A. ELECTRIC BALL VALVE
This is a normally closed electric ball valve. This valve is located on the feed side of the pressure pump. Its
purpose is to shut off the feed supply when the unit is in the non-operating mode. If electric power should fail
this valve will not close.