15
INSTALLATION INSTRUCTIONS
Check Valve
Circulation Pump
Cold water supply
to water heater
Hot water
to house
Air handler
Water heater
Outlet to the space
heating circuit
Inlet from
the space heating
circuit
Figure 11
4) Do not use toxic chemicals to clean the potable water
heating system.
5) Where water temperature in excess of 140
o
F (60
o
C) is
required for a space heating application, a mixing valve
must be installed in the potable side of the system. This
will temper the water and reduce the risk of scalding.
6) If the incoming water line to the heater is equipped with
a check valve, water meter, or pressure-reducing valve, an
expansion tank must be installed in the system. This will
prevent weeping from the water heater relief valve and
premature failure of the heater due to expansion of the
water during the heating cycle.
7) Before acquisition of a water heater for space heating
application, it is necessary to have the area of intended
use sized by a qualified technician. This will ensure that
an adequate water heating capacity will be available for
both heating and potable water supply, and that the
application will meet all local codes and public utility
requirements.
Note:
It is good practice to oversize the water heater, to
ensure that all of the potential hot water requirements
are available.
