Cleaning Water Side Of Heat Exchanger - Westinghouse WBMC**500 Manual

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4. Spray the coils again with clear tap water. Confine the spray
to the area being cleaned. Flush the combustion chamber with
fresh water until it runs clear from the condensate reservoir. At
this point, the boiler should be ready to be reassembled.
a. Inspect gaskets.
b. Reinstall the burner assembly
c. Replace and tighten the six (6) 10MM nuts to the burner
plate using staggered tightening sequence. (See detail.)
d. Reconnect all wiring connections
e. Inspect the gas valve. Ensure the O-ring is in place.
f. Replace the four (4) screws on the aluminum connector on
the gas valve. Turn the gas back on. (IMPORTANT: CHECK
FOR GAS LEAKS!)
g. Turn boiler power back on and create a heat demand. When
boiler is lit observe condensate flow from the boiler. Be sure
the boiler is operating properly.
h. Reconnect the condensate piping to the outside condensate
connection.
Do not use solvents to clean any of the burner components.
The components could be damaged, resulting in unreliable or
unsafe boiler operation, substantial property damage, severe
personal injury, or death.
Figure 31 - Heat Exchanger Detail
C. Cleaning Water Side of Heat Exchanger
1. Make sure power is
turned off to the boiler.
Run water through the
hot water system to
ensure it is below room
temperature.
2. Close isolation valves
on the return and supply
connections to the
boilers as shown in the
piping diagrams in this
manual. Slowly open the
ball valves and release
pressure into a bucket.
Once pressure is released,
connect a hose to the
water line to flush the
boiler. Scale removing
solution may be used, but
must be approved for use
with stainless steel and
FDA approved for use in a potable water system.
WHL-033 Rev. 1.29.16
3. Thoroughly flush the heat exchanger before commissioning
the unit back in service.