Slant/Fin Victory VSPH series User Manual page 31

VICTORY VSPH Models
Investigations of boilers which were installed in hard water
areas, revealed that mineral deposits had accumulated at the
bottom of the heat exchanger. In addition, sludge, scale and
other solid contaminants were present in boilers installed in
older systems or where the water was supplied from a well.
This accumulation creates an insulating layer that drastically
affects boiler efficiency by reducing the transmission of heat
through this primary transfer surface and causes extreme
metal temperatures that eventually crack the heat exchanger.
NOTE: DOMESTIC TANKLESS HOT WATER COILS ARE HIGHLY
SUSCEPTIBLE TO THIS CONTAMINATION
THE TERMS OF THE BOILER WARRANTY WILL NOT APPLY TO
FAILURES ENCOUNTERED UNDER THESE CIRCUMSTANCES.
RECOMMENDATIONS:
On all installations in hard water areas:
1. The system should be thoroughly inspected for leaks which
must be repaired however minor they may be.
The boiler warranty does not cover leaks resulting from
corrosion caused by the use of underfloor plastic tubing
without an oxygen diffusion barrier. Systems must have the
non-oxygen diffusion barrier tubing separated from the boiler
APPENDIX D
Accumulation of Foreign Deposits in Heat Exchanger
APPENDIX E
Use of Non-oxygen Diffusion Barrier Underfloor Tubing
2. The initial water charge of the system must be treated to
reduce its hardness to an acceptable level.
3. Where a continuous fresh supply of hard water is fed to the
system as with process or steam boilers, it is essential that:
a) The feed water is treated to reduce the level of hardness to
a point where no significant deposition occurs in the boiler.
OR
b) The treated boiler water circulates through a closed circuit
heat exchanger which in turn will heat the distribution sys-
tem water.
In addition to the aforementioned, older systems and those
supplied from wells may require that a filter or strainer be
incorporated in the circuit at some point on the return line
closest to the boiler. Suitable water treatment filters are com-
mercially available for this purpose.
WE STRONGLY RECOMMEND THAT YOU CONVEY THIS VITAL
INFORMATION TO ALL PARTIES CONCERNED.
with a heat exchanger, Slant/Fin recommends the use of
underfloor plastic tubing with an oxygen diffusion barrier.
Other system components may also require protection from
oxygen permeation.
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