RECO HX2 Series, Nstallation, Operation And Maintenance Manual

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IOM S
ECTION
4- M
AINTENANCE
HX2 S
ERIES
4 - 4
T
ABLE
4-2 T
ROUBLESHOOTING
F
IELD
G
UIDE
Problem
Likely Cause and Suggested Remedy
1 2 3 4 5 6 7 8 9 10
Unit fails to reach required outlet water temperature
⚫ ⚫ ⚫ ⚫ ⚫ ⚫
Outlet water temperature too high
⚫ ⚫ ⚫ ⚫
Outlet water temperature unsteady
⚫ ⚫ ⚫ ⚫ ⚫ ⚫
Tube bundle leaking
⚫
Outlet water temperature decreasing over time
⚫ ⚫ ⚫ ⚫ ⚫ ⚫
Relief valve popping
⚫ ⚫ ⚫
Control valve cycling, non-steady operation
⚫ ⚫ ⚫ ⚫ ⚫ ⚫ ⚫
Steam discharging into condensate line
⚫
4.2a Troubleshooting Issues and Remedies
1 – The RTD sensor is not reading the temperature correctly.
Remedy - Check the water temperature with a temperature gauge known to be
accurate. Replace the RTD if it is found to be faulty.
2
– The inlet steam is not at the specified temperature, pressure, or flow rate.
Remedy - Check the inlet steam pressure with a suitable pressure gauge with the
control valve fully open. If the reading is low, adjust the inlet pressure to the
required inlet pressure. If this initial reading is correct, the pressure gauge reading
should reach the design pressure for the steam in the heating coil as the water
temperature in the tank approaches shut off.
3
– The Condensate return piping has not been installed properly, and the condensate
is not able to freely drain.
Remedy - Re-route the condensate return line and assure there are no restrictions
in that line and that the condensate is either being pumped away or free to gravity
drain.
4
– The outlet steam trap or strainer basket are clogged.
Remedy - Check both for fouling and clean as necessary. Follow the procedures
given in Section 4.6 for further details on how to do this.
5
– The steam control valve or not opening or closing properly.
Remedy - Follow the procedures given in Section 4.7 for further details on how to
do this.
6
– The high temperature sensor is not set correctly or is not functioning properly.
Remedy - Check the setting on the unit and re-set as necessary. If this does not
work the sensor will need to be replaced.
7
– There is a leak with one or more tubes in the tube bundle, either directly in a tube
or at the tube-to-tubesheet interface, causing tank water or steam condensate to
leak out the tube bundle weep hole area.
Remedy – A tube has worn through, either through erosive or corrosive wear, or