14
8.
After checking that all connections are tight and the drain
valve near the bottom of the water heater is closed, go to
“Filling the Water Heater”.
SECTION B
COPPER (SWEAT) PIPING
(See Figure 19)
FIGURE 19.
1.
Position the water heater so that the existing piping will
require the shortest distance between connections. Make
sure that you are able to reach the drain valve and all
connections when the water heater is in place. This will
make it easy to service the water heater. The water heater
must be level before you begin the piping.
If a water heater is installed in a closed water supply
system, such as one having a back-flow preventer, check
valve, water meter with check valve, etc. . . in the cold water
supply, means shall be provided to control thermal
expansion. Contact the water supplier or plumbing
contractor on how to control this situation.
2.
Place the draft hood in the receiving holes where it
connects to the water heater. The legs should snap in to
give a tight fit.
Secure the legs of the draft hood with the supplied draft
hood brackets, see Figures 20 AND 20A.
FIGURE 20.
FIGURE 20A.
3.
Place the vent pipe over the draft hood. With the vent pipe
in position, drill a small hole through both the vent pipe
and draft hood. Secure them together with a sheet metal
screw.
4.
Put two or three turns of teflon tape or pipe joint compound
around the exposed end of the 1” NPT threaded nipples
for 75 gallon models or 1.25” NPT threaded nipples for
100 gallon models, see Figure 21.
FIGURE 21.
5.
Cutting custom lengths of copper pipe will be needed in
this procedure. The pipe cutter is simple to use, screw
the adjustment knob until the opening of the jaws will
allow the cutters to be placed around the pipe. Then close
the adjustment until the cutting blade is just tight against
the pipe. Do not over tighten. Make one or two revolutions
of the cutter around the pipe. Tighten the adjustment knob
slightly, and revolve the cutters around the pipe once again.
Continue this procedure until the pipe is completely cut in
two.
6.
Cleaning and brushing the piping and fittings is one of
the most important aspects of sweat connections. Clean
the ends of each piece of copper pipe with emery cloth as
