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4. EXCESS TEMPERATURE (Check on start up and once a month)
BLENDING VALVE
Those installations that are using blend valves to mix hot and cold water going to an RO unit
should be check for the maximum temperature of the hot water, especially during the winter.
Also, if the hot water leaks past the blend water valve, it could result in leaking ROMAS and
fittings. Maximum feedwater temperature should be 100 degrees F at 190 PSI, unless a
special heavy duty high-temperature pressure vessel is used.
RECOVERY RATES
Insufficient recovery rates can cause excess heat to build up due to lack of sufficient water
flow through the pump. This heat build-up can also cause leaks to develop and will cause
fouling of the membranes.
VENTILATION
Inadequate ventilation will cause the pump motor to overheat and cut out. It will also cause
leaks due to water temperature build up.
5. RO Membrane Assembly
NOT MAKING ANY WATER
(POSSIBLE REASONS)
Reject ratio is too low
Product water line is blocked
Pressure is too low
TDS is too high
Membrane is fouled
Prefilter is plugged
Storage tank has too much pressure
MAKING TOO MUCH WATER
O-ring by-pass in the RO membrane assembly
Chlorine damage to the membrane
Water temperature increase
Reverse flow through the membrane (causes a rupture in the
membrane)
TDS IS TOO HIGH
O-ring by-pass in the RO membrane assembly
Chlorine damage to the membrane
Membrane is fouled
Ruptured membrane
Increase in the feedwater TDS
High pH in the feedwater
Summary of Contents for CAK Series
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