Appendix B: Pre-Installation ConsiderationsModel 2500 197
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9 Appendix B: Pre-Installation Considerations
1 Locations using 115V, 60-cycle AC should provide a separate 20-A circuit for each Distek
Model 2500 System that they intend to install. In cases where additional modules
(sampling, monitoring, and printing) are being installed, separate 20-A circuits are
necessary.
2 Similarly, if 230V, 50 cycle AC systems are being installed, each system should be wired to
a separate minimum 15-A circuit.
3 Because of the extensive use of microprocessor technology, it is recommended, where
possible, that 12-gauge stranded-copper wiring be used for all circuit wiring. In cases
where the distance from the circuit breaker sub-panel to the outlet exceeds 500 feet
(150m), 12-gauge wire is the minimum that should be used. The use of larger diameter
wiring reduces the voltage drop in the wiring, and increases the inductive impedance of
the circuit which helps smooth voltage fluctuations.
4 In addition, an isolated ground wire should be used and the site should be wired in a 3-
phase, 4-wire configuration with an approximate load balancing among the phases. In
sites where many systems are being installed, the number of systems wired to each
phase should be balanced as much as possible.
5 To minimize the risk of damage to a system from electrical system problems:
Verify that the power wiring configuration is proper.
If possible, verify the current dissipation capacity of the “ground” and the “neutral”
lines in the circuit wiring.
Building mains should be protected with “lightning suppressors” and, ideally, each
circuit should be terminated by the appropriate “surge protection” receptacle. (In
the United States, suitable receptacles are supplied by Hubbell, Inc. Alternately, a
sized computer-grade surge-suppression accessory with the appropriate current
rating can be added to existing circuits.)
For those users who require protection from voltage drop-outs, short term power
interruptions, and supply voltage reductions, a suitable standby Uninterruptible
Power Supply (UPS) should be installed between the supply and the dissolution
system.
For those sites whose power quality is compromised either by the nature of the
generation source or imposed fluctuations and pulses, an isolation transformer or an
on-line UPS may be needed.
Although the Distek Model 2500 is designed with internal surge protection, failure to follow these
recommendations may compromise the operation of the system and, should the system be
damaged by power surges, lightning or other significant power fluctuations, such system damage
is not covered by Distek’s warranty.
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