Water Connections - Bosch 125FX LP Installation And Operating Instructions Manual

It is strongly recommended that the natural gas pipe line
be 3/4" for the entire distance. If the maximum length is
above 40 feet, use 1" line. Flexible tubing is NOT
recommended, but if it is to be used, oversize it. With LP
gas installation, the recommended sizes are 5/8" up to a
maximum of 20 feet distance, 3/4" up to 50 ft distance and
7/8" up to 100 feet.
National Fuel Gas Code requires that a sediment trap (drip
leg) be installed on gas appliances. The drip leg must be
accessible and not subject to freezing conditions. Install in
accordance with the recommendations of the gas supplier.
NOTE: The AquaStar 125FX is supplied with a gas
pressure regulator that must be installed on the heater
before attaching the gas supply line. See figure 6.
Failure to install the gas regulator as shown in figure
6 will be a violation of CSA certification of the unit.
The regulator supplied with the heater is preset for
the gas shown on the rating plate to the correct
pressure. It is an appliance level regulator designed
for (low inlet) pressure (less than 1/2 Psig or 15" W.C.)
DO NOT connect to an unregulated or high pressure
propane line or to a high pressure commercial natural
gas line.
Fig. 6 - Appliance pressure regulator
(with directional arrow on reverse side pointing up)
The pressure regulator provided with the heater is adjusted
to deliver the proper gas pressure (as indicated on the
rating plate and in the manual for altitude up to 2000 feet
(660 meters) above sea level. On appliances being installed
above 2000 ft (660 meters) elevation, the inlet gas pressure
should be set at installation to the value shown below.
NOTE: The gas pressures specified below refer to
pressures taken at the pressure tap on the gas inlet
pipe just above the regulator (See Fig 6). These
readings should be taken while the heater is operating
at full input — i.e. maximum water flow with the
temperature dial selector turned all the way
clockwise.
MAXIMUM INLET PRESSURE SETTINGS
Altitude Natural Gas
inches W.C:
0' - 2.000 ft
2.000 ft - 4.500 ft
Above 4.500 ft consult your local gas provider.
10
GAS INLET PIPE
PRESSURE TAP
PLASTIC CAP
APPLIANCE PRESSURE
REGULATOR
(with directional arrow on
reverse side pointing upward)
Liquid Propane
inches W.C:
5.38 9.9
4.40 7.90
WARNING: The heater must be disconnected from
the gas supply piping system during any pressure testing
of that system at test pressures in excess of .5 psig.
The water heater must be isolated from the gas supply
piping system by closing the manual shutoff valve during
any pressure testing of the gas supply piping system at
test pressures equal to or greater than .5 psig.
The water heater, including the pressure regulator provided
with it, must not be operated at gas supply pressures in
excess of .5 psig. If overpressure has occurred, such as
through improper testing of the gas lines or malfunction of
the supply system, the gas valve and regulator must be
checked for safe operation.
When your connections are made, check for gas leaks at
all joints (not just the ones you made). Apply some soapy
water to all gas fittings and gas valve. Soap bubbles are
a sign of a leak.
NOTE: Do not apply soap solution to pilot filter screen or
pilot orifice area. If you have a leak, shut off the gas. After
verifying that required gaskets are in place, tighten
appropriate fittings to stop leak. Turn the gas on and check
again with a soapy solution. Never test for gas leaks using
a match or flame.

WATER CONNECTIONS

When facing the heater, the cold water inlet is on your right
and the hot water outlet is on your left.
Although water piping throughout your structure may be
other than copper, we recommend that copper piping be
used for at least three feet before and after the heater (follow
local codes if more stringent). Keep water inlet pipe to no
less than 1/2 inch diameter to allow the full flow capacity.
Remember that water pressure must be sufficient to activate
the heater when drawing hot water from the top floor. If the
hot and cold connections to the heater are reversed, the
heater will not function. The AquaStar 125FX is provided
with two flexible type connectors that must be connected
to the inlet and outlet fittings of the water valve as shown in
Figs 7 and 8. ½" Copper or brass fittings work best when
connected to the connectors. See Fig 8. These connectors
seal to the water valve by means of a union connection
with a washer type gasket at the joint. No pipe dope or
thread tape is to be used at these joints. Be certain there
are no loose particles or dirt in the piping. Blow out or flush
the lines before connecting to the AquaStar. Full port valves
should be installed on both the cold water feed line and the
hot water outlet line to facilitate servicing the heater.
For installation on a private well system, be sure that the
water pressure is set between 30 and 50 psi.
INLET
FLEX
CONNECTORS
OUTLET
Fig.7 - Water valve and water connectors, top view
WASHER
WATER FILTER
WATER VALVE
WASHER