Hubbell ST - Manual (Page 29)

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High rate of flow beyond
design conditions. Consult factory. Excessive vibration.
Under sized piping to the
unit. Re-pipe lines to unit using proper
sized lines.
Defective steam trap. Repair or replace per separate O&M.
Undersized condensate lines. Re-pipe condensate line using proper
sized lines.
Water hammer.
Insufficient slope on
condensate lines causing
backup. Increase slope on condensate lines.
* Red symptom indicates that equipment should be shut down immediately and cause of malfunction
corrected before unit is re-started or serious damage may result.