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Low Product Flow™
Spectra Service Bulletin
Low product flow can be caused by a number of different issues relating to the
Spectra System. As with any troubleshooting procedure you must first check
your facts! Don't rely on the product flow meter for accurate information.
Perform a flow rate check by diverting the product into a measured container.
- The product
flow is directly related to feed flow, so look for restrictions in the
flow path such as the strainer and filters. Do not make assumptions
that your filters are clean by the way they look. Make sure any three
way valves are in the proper position.
- Check the voltage at the feed pump or pumps. This is imperative, as there
may be a voltage drop between the distribution panel and the feed pump
due to a poor connection, breaker or fuse. A 10% voltage drop will cause
the product to drop 10% as well. We have seen a few cases of voltage
drop across the pumps’pressure switch. If you are electrically
handy you can check to see if this is your issue. It would be an acceptable
field repair to bypass this switch as long as the pump is properly fused.
- Next we often see 380-C systems that one or both of the feed pumps pressure
switches are out of adjustment. This will cause one of the feed pumps
to cycle on and off during operation impeding the system flow which
affects product flow. To see if this is an issue you need to block off
the brine discharge and then check the pressure cut off point of each
pump individually. Cut off pressure should be set between 120 and 125
PSI. This can be readjusted with the small Allen screw on the pressure
switch end of the pump.
- We also see customers that have pumps that are worn due to long operational
hours. The most reliable way to determine this is to check the flow
of the pump by measureing the rate of flow into a bucket or known container.
The easiest way to perform this check is to run the system, discharging
both the brine and the product flow into your measuring bucket. The
total flow under pressure for the 200-C system should be between 1.4-1.5
GPM and the 380-C should be 2.4-2.5 GPM.
- If the system flow is correct and product flow is not then there is a leakage
in the Clark-pump.
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