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20 | Installation instructions
▶ Never sweat any piping directly to or beneath the water
connections, as damage will occur to the internal water
valve from heating of the pipe.
▶ Keep water inlet and outlet pipes to no less than ¾"
(19.05mm) diameter to allow the full flow capacity.
▶ If the cold and hot connections to the heater are reversed,
the heater will not function.
▶ Be certain there are no loose particles or dirt in the piping.
Blow out or flush the lines before connecting to the water
heater.
▶ Full port shutoff valves should be installed on both the cold
water supply and hot water outlet lines to facilitate
servicing the heater (see fig. 14).
▶ For installation on a private well system with the use of a
pressure tank, the lowest pressure range setting
recommended is 30 psi (2.06 bar).
▶ Proper insulation material should be used in places prone
to freezing conditions.
Connecting the pressure relief valve (PRV)
A pressure relief valve must be installed at the time of
installation. No valve is to be placed between the PRV and the
heater. No reducing coupling or other restriction may be
installed in the discharge line. The discharge line must be a
minimum of 4" above a drain and installed such that it allows
complete drainage of both the PRV and the line. The discharge
line must be placed where it will not cause any damage.
The location of the PRV must be readily accessible for servicing
or replacement, and be mounted as close to the water heater as
possible. See fig. 14. To install the PRV, a suitable fitting
connected to an extension on a "T" fitting can be connected to
the hot water line.
▶ Support all piping.
6 720 817 281 (2017/05)
Fig. 14
Plumbing Connections (with shutoff valves) and
Pressure Relief Valve
[1] Pressure relief valve
Greentherm 9800 SEO 160/199 | SECO 199
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