INSTOMAX
TM
Integrated instantaneous water heater installation, use and care manual
(Revision Sept 2013)
,
Page
6.
Figure 3 : Basic piping lay-out.
The expansion tank supplied with the water
heater is to compensate for the water volume
expansion cause by the tank water temperature
rise.
Typically, the expansion tank is mounted on an
adjoining wall or ceiling and directly connected
to the tank 1/2NPT male connector specially
provided for this purpose.
3.5.3 Automatic air Vent
An automatic air vent used to eliminate any
entrapped air from the tank is provided and
factory installed on the INSTOMAX™ DO NOT
block or plug the air bleeder outlet. It must be
rapidly changed if it keeps leaking.
3.5.4 Domestic hot water connections
Both the domestic fresh water inlet and hot
water outlet are well indentified on the water
heater right side (HOT WATER OUTLET and
COLD WATER INLET). 3/4’’ NPT FEM fittings
are use for connections.
Use only clean new pipe for domestic water
connection. Local codes, regulations and
authorities having jurisdiction may required
specific
pipe
material
to
be
used
for
connections.
Insulate
all
pipes
containing
hot
water,
especially in unheated areas.
A thermometer should be installed to indicate
the domestic hot water temperature at or near
the INSTOMAX™ domestic hot water outlet.
3.5.5 Expansion tank on the cold water
supply line
Determine if an equipment incorporating a flow
check valve is present on the cold water supply
line.
Such items may create a closed system and
prevents the water, as it is being heated, from
expanding back into the cold water supply line.
Pressure can build up within the water heater,
causing the pressure relief valve to operate
during a heating cycle. This excessive operation
can cause premature failure of the relief valve
and possibly of the water heater itself.
