Installation Instructions for Water Heaters
Approved for Combination Space Heating and
Potable Water Heating (See Figure 11)
A water heater cannot be used for space heating
application only. When using a water heater for com-
bination space and potable water heating, the instruc-
tions provided in this manual and with the air-han-
dling unit must be respected and,
in particular
, the
following:
1) All piping and components that are used in the
system must be of a nonferrous type suitable for
potable water. This also applies to any sealant used.
2) When used as a dual purpose water heater, it
must not be connected to any system that has
been previously used for non-potable water heat-
ing. This includes any piping because, in all prob-
ability, existing piping would have been, in the
past, treated with chemicals for cleaning or seal-
ing the system.
3) If this water heater is to be used for space
heating, make sure that all safety codes are
respected. Pay special attention to safety valve
pressure and expansion tanks.
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 heat-
ing application, it is necessary to have the area of
intended use sized by a qualified technician. This
will ensure that an adequate water heating capac-
ity will be available for both heating and potable
water supply, and that the application will meet all
local codes and public utility requirements.
11
INSTALLATION INSTRUCTIONS
Check
valve
Cold water supply
to water heater
Outlet to the
space heating circuit
Inlet from the
space heating
circuit
Sortie vers le circuit
de chauffage du bâtiment
Entrée du circuit
de chauffage
du bâtiment
Air handler
Water
heater
Hot water
to house
Circulation
Pump
Clapet
de retenue
Arrivée d'eau froide
Conduit
d’évacuation
Exhaust Vent
Échangeur d'air
Chauffe-eau
Eau
chaude
vers la
maison
Pompe
circulatrice
Figure 11
