13
12
Make sure that the inlet pressure to the water heater
does not exceed
1
/
2
psi (3.5 kPa) for both natural and
propane gases. Pressures in excess of
1
/
2
psi (3.5 kPa)
can damage the gas control valve, resulting in a fire or
explosion from leaking gas. For purposes of adjust-
ment, the minimum inlet pressure is indicated on the
water heater rating plate.
If any pressure testing of the gas line is undertaken at
test pressures in excess of
1
/
2
psi (3.5 kPa), the water
heater and its gas supply manual shut-off valve must
be disconnected from the gas supply piping system,
and the end of the pipe sealed with a female cap. If
the testing is to be undertaken at a test pressure less
than
1
/
2
psi (3.5 kPa), the gas supply manual shut-off
valve must be closed.
Installation Instructions for Water Heaters
Approved for Combination Space Heating and
Potable Water Heating (See Figure 12)
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-handling
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 sealing
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.
Eau chaude
vers la maison
Sortie d’eau
du circuit
de chauffage
Entrée d’eau
du circuit
de chauffage
Chauffe-eau
Pompe circulatrice
Clapet de retenue
Échangeur d’air
Arrivée d’eau froide
Hot water
to house
Space heating
Outlet
Space Heating
Return
Water Heater
Circulation Pump
Check Valve
Air handler
Cold water supply to water heater
Figure 12
INSTALLATION INSTRUCTIONS
