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WARNING!
THE 24V DC SIGNAL MAY BE PRESENT IN THE SYSTEM CONTROLLER EVEN WHEN THE CONTROLLER POWER HAS
BEEN MANUALLY DISCONNECTED FROM THE 3-PHASE POWER SOURCE. YOU MUST TURN OFF THE 24 V
ELECTRICAL SIGNAL (RO REQUEST) FROM THE RO SYSTEM CONTROLLER BEFORE PERFORMING MAINTENANCE OR
REPAIR TO THE SYSTEM CONTROLLER. FAILURE TO DE-ENERGIZE THIS CIRCUIT COULD LEAD TO EQUIPMENT
DAMAGE OR PERSONAL INJURY.
2.6 System Performance
The stainless steel RO storage tank is integrated into the stainless steel stand. Municipal water fl ows to a solenoid outside the
tank to automatically supply municipal water to the tank if there is a failure in the system.
RO systems are designed to provide spot-free rinse water to the car wash tunnel and are rated by the volume of RO water
produced per day. Membranes are extremely sensitive to feed water temperature and will typically lose approximately 2% of
fl ow for every 1F drop in feed water temperature at constant pressure.
The innovateIT R.O. System is conservatively rated for consistent performance from 40F to 80F feed water temperatures. The
system utilizes oversized membranes operating at conservative fl ux ratings combined with daily RO fl ush cycles to achieve
high-quality water and long membrane life.
The unit provides 10 GPM (Standard Flow)/15 GPM (High Flow). The maximum commanded fl ow at low tank levels is 18 GPM
(Standard Flow)/26 GPM (High Flow) are programmed. These max fl ow ratings can only be achieved when the water tempera-
ture is 77F or above.
The RO volume (gallons per car) should be set for the coldest expected feed water which eliminates the need to adjust the
fl ow to the tunnel throughout the year to adjust for changes in municipal water temperature variation. The pressure required
to generate full fl ow will range from 70 psi (@ 80°F) to 200 psi (@ 40°F).
The Grundfos VFD pump has been oversized to allow this wide range of temperature capability while using Dupont (formerly
Dow Filmtec) membranes which ensure high quality (low TDS RO water). The VFD pump also allows pumping at the correct
pressure and fl ow to generate the needed RO fl ow to support the tunnel demand.
Although the unit has a 7.5 HP pump, most of the time this system will be running at much lower power. The electrical energy
used to generate the RO increases as the RO membrane fl ow increases.
The result of generating RO at the rate required to satisfy the tunnel demand results in reduced energy consumption per gal-
lon of RO produced. The membrane's performance varies as the feed water temperature changes. This means the RO pump
pressure must increase to maintain fl ow as feed water temperature drops.
Over time, the fl ow and pressures may vary. Lower fl ow rates would indicate potential scaling or fouling of the membranes
and higher RO fl ows or increasing RO TDS readings may indicate either membrane damage (caused by chlorine damage) or a
membrane O-ring seal leak.
The TDS of the RO water ranges between 0 and 15 PPM with new membranes. New membranes process chemicals in the RO
membrane material, and the initial 60 minutes of operation the TDS will go from 200 ppm or higher down to the normal 0-15
ppm level.
This represents normal start-up for new membranes. If after an hour of operation, the TDS is still running above 15 ppm the
operator should pull a sample from the bottom of each membrane to determine if a seal was cut during assembly of the mem-
System Overview
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