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TANKLESS
WATER HEATERS
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Tankless Water Heater Product Guide
Description / Specification
Tankless Water Heater Applications
Residential / Commercial
Tankless Water Heater Electrical Guide
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Tankless Water Heater Installation
Plumbing / Electrical
Tankless Water Heater Cost Comparisons
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Tankless Water Heaters Service Guide
Remove / Repair
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HEAT SINK REPLACEMENT
The heat sink is
a metallic bar (aluminum or copper) located to the right of the heating
chamber and it covers part of the inlet tube. It will be necessary to
remove the control board as it is attached to the heat sink.
Required Tools: Large & small Phillips screw
drivers, battery powered volt meter, rag, bucket, two pipe wrenches, needle
nose pliers, heat sink compound and Teflon tape pipe sealer.
WARNING: To avoid electrical shock,
make sure that all of the power is off to the heater before attempting
to remove the old heat sink and while installing the new heat sink.
- Turn off all the power to the heater. Confirm
the power is off with a voltmeter, even if the status light (or
LED) on the control board is off. There may be multiple breakers powering
your model heater.
- Open a hot water faucet nearby. While the
water is running, turn off the water supply to the heater. This will
help siphon some of the water out of the heater.
- Using a large Phillips screw driver,
remove the six screws from the right bottom clean out plate on the under
side of the heating chamber (there is only one clean out plate on a
two chamber heater) to drain the remaining water from the heater into
a bucket. Replace the plate after draining.
- Remove the control board according to procedure
A. Changing The Control Board.
- Using two pipe wrenches, disconnect
the incoming water line threaded onto the top of the inlet fitting.
Use the rag to prevent any water dripping or spraying, which
should be very little if any.
- Remove the two screws from the top of the
heat sink and the two screws from the bottom. This will require rotating
the heat sink to gain access to the screws. Also, there are holes through
the right side of the metal casing to allow the screw driver to fit
through.
- Slide the top inlet tube up and out of the
heat sink. There are two o-ring seals on the inlet tube.
- Slide the heat sink up and off the lower
inlet adapter tube and remove the heat sink. At this point, if necessary,
the lower inlet adapter tube can be removed for replacement.
- Replace the heat sink and re-assemble in
the reverse order
- Wrap the Teflon tape pipe sealer around
the threads of the inlet fitting and reconnect the incoming water line.
Do not use Plumber’s Putty or Pipe Dope
on the threads of the inlet and outlet fitting connections. If using
CPVC or PVC primer and glue, avoid contact of these substances with
the inlet and outlet fittings on the heater. These substances are highly
corrosive and can damage the inlet and outlet fittings. Leaks may occur
as a result and cause severe damage to the heater.
- Turn on the water and check for leaks.
- Re-install the control board and turn on
the power to the heater. Make sure that all of the circuits are on to
power the heater.
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