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Copper Brute B4 Volume Water Heaters
21. Install the front access door on the heater.
22. Turn all electrical power to the heater on.
4.3 HEAT EXCHANGER
4.3.1 Inspecting the Heat Exchanger
To check the scale buildup, periodically inspect
the tube having the highest temperature as follows:
1.
Open the drain valve on the left side of the
heater.
2.
Remove the hex-head plug located on the right
side of the heater under the in/out header (see
Figure 34). Perform this inspection after 60 days
of and after 120 days of operation. This will
establish a regular inspection routine.
Figure 34. Scale inspection.
City
Water
Supply
Notes:
1.
When pressure relief valve is used, it must be removed and the hole plugged, as shown.
2.
Remove the plug before reinstalling the heat exchanger.
Figure 35. Heat exchanger tube cleaning.
Plug
4.3.2 Cleaning the Heat Exchanger
An inspection and cleaning of the complete heat
exchanger can only be done by removing it from the
heater.
1.
To remove the heat exchanger, refer to Section
2.6.1.
Caution
Black carbon soot buildup on a dirty heat exchanger
can be ignited by a random spark or flame. To
prevent this happening, dampen the soot deposits
with a wet brush or fine water spray before servicing
the heat exchanger.
2.
Remove the heat baffles and check for a light
accumulation of soot or corrosion on the outside
of the heat exchanger tubes.
NOTE: While the heat exchanger is out of the
heater, inspect the firewall refractory insulation blocks
for cracks, wear, and breakage. Replace if necessary.
3.
Use a wire brush to remove soot and loose scale
from the heat exchanger. Do not use water or
compressed air for cleaning.
NOTE: Use only the correct carbide tipped
reamers which are available from Bradford White.
4.
Ream the insides of the tubes (see Figure 35).
5.
Pull the reamer out frequently to remove lime
powder and prevent the drill from binding in the
tube.
6.
Install new gaskets. Do not reuse the old ones.
7.
Tighten the header bolts progressively, starting
with the two center bolts. Maximum torque is 20
inch pounds (27 Nm). Do not over-torque.
400-500 RPM
Drill Motor
Page 25
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