12
INSTALLATION INSTRUCTIONS
4) Do not use toxic chemicals to clean the potable
water heating system.
5) Where water temperature in excess of 140˚F
(60˚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 with all local codes and pub-
lic utility requirements.
Note:
It is good practice to oversize the water heater,
to ensure that all of the potential hot water require-
ments are available.
Check
valve
Cold water to heater
Air handler
Water
heater
Hot water
to house
Circulation
pump
Figure 12
