Dometic SPOTZERO SZIII 2000, User Manual & Installation Manual

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Components of the SZIII Unit
System Controller
The controller is a logic-based PC board that can analyze and control all electrical components
within the system. Its primary functions are to monitor safety thresholds of high and low pressure and
perform the proper sequence of operations to optimize the start, running, and shut-down operations.
Freshwater RO Pump
The pump used on the SZIII-series systems is a rotary vane pump constructed out of bronze.
The pump must never be run dry. Operating the pump without sufficient feed water will damage
the pump.
Always use the required filters when operating this unit. The pump is susceptible to damage from
sediment and debris.
Refer to the pump information on
for further information and maintenance schedule as
well as instructions on what to do if the pump fails.
Membranes
The SZIII system comes pre-loaded with proprietary best
membrane performance and longevity, -filters, operate it within the pressure
and flow limits, and perform scheduled flushing and maintenance when needed.
Membrane Operation Guidelines
Avoid any abrupt pressure or crossflow variations on the spiral elements during start-up, shut- down,
cleaning, or other sequences to prevent possible membrane damage. During start-up, a gradual change
from a standstill to operating state is recommended as follows:
Feed pressure should be increased gradually over a 30-60 second time frame.
Crossflow velocity at set operating point should be achieved gradually over 15-20 seconds.
Permeate obtained from first hour of operation should be discarded.
Membrane General Guidelines
Always keep elements moist after initial wetting.
If operating limits and guidelines given in this bulletin are not strictly followed, the limited
warranty will be null and void.
To prevent biological growth during prolonged system shutdowns, it is recommended that
membrane elements be immersed in a preservative solution.
The customer is fully responsible for the effects of incompatible chemicals and lubricants on
elements.
Maximum pressure drop across an entire pressure vessel (housing) is 50 psi (3.4 bar).
Always avoid static permeate-side backpressure.
NOTE
Only use Spot Zero Membranes in your Spot Zero Unit. Using other membranes will cause
high PPM/TDS water that will not meet system standards.
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