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Water is then pumped through a thin film composite reverse osmosis (R.O.) membrane at about 160 PSI (11.03
bars). The R.O. membrane removes over ninety percent (90%) of a variety of salts and inorganic materials
found in water, such as dissolved salts of sodium, lead, nitrate; it removes typically over ninety-nine percent
(99%) of radioactivity, like radon. Actual rejection rate will depend on feed water chemistry, temperature, and its
total dissolved solid content.
Water is then stored in an atmospheric water tank, sealed except for an air vent, which is protected from dust and
airborne bacteria by a submicron air filter.
When your customer selects a vend, water will be pumped through a combination sediment/carbon POLISHING
FILTER which removes any remaining taste and sediment, and an ULTRAVIOLET (U.V.) STERILIZER which
sterilizes the water.
To keep the stored water fresh and sterilized, the water in the storage tank is recirculated through the polishing
filter and the U.V. sterilizer periodically.
Safety is our prime concern and it is designed into the machine. At the inlet and outlet of the R.O. membrane, a
comparator reads the total dissolved solid rejection rate, an indicator of the performance of the membrane. If the
rejection rate falls below a certain level, the microprocessor will shut the machine down. The same logic applies
to the U.V. sterilizer, where a true U.V. sensor continually monitors the disinfecting power of the light and shuts
down the machine when the U.V. level is not high enough.
There is also overflow and leakage protection. The sensors are located on the base of the machine, in the drain
tank of the dispensing bay and in the water storage tank. These sensors detect overflow or leakage and will shut
off whatever components are necessary.
NOTE: The machine is approved by the NATIONAL AUTOMATIC MERCHANDISING
ASSOCIATION (NAMA) in Chicago. In many states, this is a requirement for water
vending machine installation.
C. WATER SUPPLY
The following conditions are required for optimum performance:
WARNING: FEED WATER MUST COME FROM INSPECTED, APPROVED WATER
SYSTEMS ONLY. SOURCE MUST BE MICROBIOLOGICALLY SAFE
DRINKING WATER.
1. Minimum Pressure/Inlet Flow Rate
4 gallons (15.14 liters) a minute at 35 PSI (2.41 bars) back pressure or the equivalent of 9 gallons (34.06
liters) per minute at a free flowing 1/2” N.P.T. outlet at the intended location of the machine. This test
should be conducted with ALL other equipment connected to the same water line running to reflect true
flow.
2. Maximum Water Pressure
The maximum water pressure is 80 PSI (5.51 bars). Install a pressure regulator if incoming water pressure
may exceed this level. High inlet pressure will irreparably damage filter housing and cause leaks in the
system.