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Measuring Gas Pressure; Water Connections - Bosch AQ 125BO LP Use And Care Manual

Outdoor water heater
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Installation
instructions
3.6
Measuring
gas pressure
Connecting
manometer
• Shut off gas.
Remove front cover
and locate
inlet gas pressure
measuring
point on the right side of the gas valve.
Loosen screw from test point on the left side of gas
valve and connect
manometer
tube on test point.
Static pressure
test
• Turn gas supply back on.
• Operate all other gas appliances
on same gas piping
system at maximum output.
Record static gas pressure
reading on back page of
manual.
Operating pressure test
Run high hot water flow rate.
• Set flow control knob fully clockwise.
• Set slide control to the right.
Record
operating
gas pressure
reading
on back
page of manual.
Gas pressures
lower than 5.7" W.C. for Natural Gas or
10.5" W.C. for LP Gas will result in insufficient
degree
rise to the hot water being used, and must be corrected.
See Gas Line Sizing under chapter
3.5.
3.7
Water connections
_]
When facing the heater, the 1/2"cold water inlet is on the
bottom
right and the hot water outlet is on the bottom
left.
• INSTALL
A
UNION
WHEN
CONNECTING
WATER
PIPE
TO
FACILITATE
ANY
NECESSARY
CLEANING
AND SERVICING.
Although
water piping throughout
your structure
may be
other than copper,
we recommend
that copper
piping
or suitably rated stainless
steel flex line piping be used
for at least three feet before and after the heater (follow
local codes
if more stringent).
Never sweat any rigid
piping
directly
to or beneath
the water
connections,
damage
can occur
to the internal
water
valve from
heating of the pipe. Plastics or other PEX type plumbing
line materials
are not recommended
for connecting
directly to the water heater. Keep water inlet and outlet
pipes to no less than 1/2" (12.7ram) diameter to allow the
full flow capacity.
It is recommended
that all water
piping below the
heater
be properly
insulated
to avoid heat loss. If
below freezing temperatures
are ever anticipated
where
the heater is located,
insulation material is required and
must be capable of protecting
the piping from freezing.
The freeze protection
provided
with the heater will not
prevent any freeze damage to the exterior water piping.
If the cold
and
hot connections
to the
heater
are
reversed,
the heater will not function.
Be certain there
are no loose particles
or dirt in the piping.
Blow out or
flush the lines before connecting
to the water
heater.
Full port valves should
be installed
on both the cold
water
supply
and hot water
outlet
lines to facilitate
servicing
the heater (see Fig. 9). For installation
on a
private well system with the use of a pressure tank, the
lowest pressure
range setting
recommended
is 30-50
psi (2.07 and 3.45bar).
Connecting
the pressure
relief valve (PRV)
A listed pressure
relief valve supplied
with the heater
must be installed
at the time of installation.
No valve is
to be placed
between
the PRV and the heater.
No
reducing
coupling
or other restriction
may be installed
in the discharge
line. The discharge
line must
be a
minimum
of 4" above a drain and installed such that it
allows complete
drainage
of both the PRV and the line.
The location
of the PRV must be readily accessible
for
servicing
or replacement,
and be mounted
as close to
the water heater as possible.
See Fig. 9. To install the
PRV, a suitable
fitting connected
to an extension
on a
"T" fitting can be sweated to the hot water line.
Support
all piping.
Fi9.9
_
t
Plumbing
Connections
and
Pressure
Relief
Valve
12
8716473147

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