OIL CONDENSING BOILER
INSTALLATION AND USER MANUAL
INSTALLATION & USER MANUAL www.krb.co.kr
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3.2. General cautions for piping
• Connect the pipes with unions or flanges for easy replacement or maintenance,
or line modification in the future.
• Apply thermal insulation to feed water line, hot water line, heating water line,
distributer, and check valve.
• Piping materials must satisfy applicable standard.
• Before connecting the heating and hot water line to the boiler, flush the lines to
remove foreign matters in the lines (thorough cleaning).
• Do not use underground water as the heating water. If using underground water
in the heating system is unavoidable, clean up the pipeline thoroughly.
• Arrange the exposed pipeline in good order and apply thermal insulation.
Vertical lines must be fixed to prevent displacement.
• The foreign matters in the pipeline reduce system efficiency and cause failures.
• Air inside pipeline must be thoroughly removed.
• If the boiler feed water line is connected directly to city water line, install a filter,
pressure regulator valve, check valve, safety valve, and closed type expansion
rank in the incoming line.
• The safety valve and closed expansion tank must have sufficient capacities.
• The hot water line pipes must be coated product or stainless steed products.
• The capacity of the circulation pump must be sufficient for the hot water return
line, and provided with a drain valve.
• Install a water feed (cut off) valve in the feed water line.
• If the feed water pressure is too high, install a pressure reducing valve.
• The feed line pipe and return line pipe must be of the same size.
• Install a drain valve at the lowest point of pipeline. Arrange the line so that all
the heating line can be thoroughly drained when necessary.
• Generally, the atmosphere open (downward) model boilers are installed on the
same floor with the heating line.
• If the heating line is on a higher floor than that of the boiler, the boiler must be
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