Water Tec Int’l. Inc. Version 02A
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9.
WASTE VALVE
This valve is located on the front panel of units 1500 GPD and larger, and on other various locations of smaller
units. Ex. the valve is located on the membrane housing of the compact unit. Its purpose is to meter or restrict
the flow of concentrate water exiting the module, thus creating the necessary pressure inside the module so
that the raw water will be forced through the membrane, creating the effect of reverse osmosis.
Turning the knob of the valve controls the waste / product water ratio. Turning clockwise will increase the
pressure setting within the module and reduce the amount of wastewater. Turning counter clockwise will
reduce the pressure in the module and increase the wastewater. If this valve cannot attain a desired pressure /
waste / product ratio, then set the desired waste / product ratio at a lower pressure setting and adjust the
pressure with the recycle valve.
CAUTION: The Waste Valve should never be closed completely.
CAUTION: Do not exceed the recommended 200 PSI setting.
10. RECYCLE VALVE
Located on front panel of 1500 GPD and larger, this valve takes a portion of the wastewater from the reverse
osmosis module and feeds it back into the feed side of the high-pressure pump. It is used to fine tune and
adjust the pressure of the high-pressure pump.
11.
PRE-FILTER
This filter will vary in size and quantity depending on the size of the R.O. You must open the housing in order to
determine if you have a single cartridge pre-filter or a multi-cartridge pre-filter. The standard micron rating for
the R.O. pre-filter is 5 microns. This filter is used to catch any particles that may have been missed by the Pre-
Treatment or any particles that may be released by faulty Pre-Treatment. Leaving a dirty filter cartridge in the
R.O. can cause pressure loss and inefficient pre-filtration. See page 10 for the standard filtration series of the
Compact Unit.
WARNING: At no time should this filter be used as the sole source of Pre-Treatment for the R.O.
12.
HIGH PRESSURE PUMP
This pump is responsible for creating the necessary high pressure needed for efficient reverse osmosis
operation. Pressure is adjusted by the Waste Valve and the Recycle Valve.
CAUTION: Do not run pump dry.
CAUTION: Do not exceed the maximum output pressure (200 PSI)
13. MOTOR CONTACTOR
Located in the electrical system control box. A heavy duty rated contactor to start and stop the high-pressure
pump motor.
14.
ON-OFF SWITCH
Located on the electrical system control box on all models except the compact. This switch controls the
electrical supply to the RO unit.
15. LOW PRESSURE SWITCH
Located on the electrical system control box. This switch is fed from the feed water before going into the high-
pressure pump. Should the feed water drop below 10 PSI, the contacts in this switch would open and shut
down the RO unit. When the feed water pressure returns, the RO unit will automatically restart. This switch is
adjustable form 0-90 PSI. Recommended setting is 12-15 PSI.
CAUTION: Do not bypass this switch.
16.
TDS PANEL MOUNT METER
Located on the electrical system control box. Total Dissolved Solids Meter. Standard on all units 30,000 GPD
and larger. This is an option for units smaller than 30,000 GPD, and larger then 1500 GPD. All X frame units
include a dual switch to read the pre-membrane TDS and the post-membrane TDS.
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