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Water Connections - Bosch 38B LP Installation And Operating Instructions Manual

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INLET GAS FITTTING
WITH GASKET
1/2" BRASS
BUSHING
GAS SHUT-OFF
COCK
Fig. 2 - Gas Pressure Regulator
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 2). 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 GAS FLOW PRESSURE SETTING
Altitude
Natural Gas
inches W.C:
0' - 2.000 ft
2.000 ft - 4.500 ft
Above 4.500 ft consult your local gas supplier.
National Fuel Gas Code requires that a sediment trap (drip
leg) be installed on gas appliances not so equipped. The
drip leg must be accessible and not subject to freezing
conditions. Install in accordance with the recommendations
of the serving gas supplier.
WARNING: The heater and its individual shutoff
valve must be disconnected from the gas supply piping
system during any pressure testing of that system at
test pressures in excess of 0.5 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 more than 0.5 psig.
The water heater, including the pressure regulator provided
with it, must not be operated at gas supply pressures in
excess of 0.5 psig. If overpressure has occurred, such as
through improper testing of the gas lines or malfunction of
PRESSURE TAP
PLASTIC VENT CAP
PRESSURE
REGULATOR
(with directional
arrow on reverse
side pointing upward)
APPLIANCE GAS
REGULATOR
Liquid Propane
inches W.C:
5.7"
10.5"
4.6"
8.4"
the supply system, the gas valve and regulator must be
checked for safe operation.
Make sure that the regulator vent is protected against
blockage.
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.
Threaded connectors are supplied with this heater for both
the hot and cold water fittings. See fig. 3. These fittings
permit 1/2" NPT connections to be made. 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.
HOT OUTLET LINE
(CONNECTED TO HEAT
EXCHANGER)
3/8" WASHER
3/8" x 1/2"
BRASS FITTING
Fig. 3 - Water connections
Connecting the pressure relief valve (PRV)
A listed pressure relief valve supplied with the heater must
be installed at the time of installation. Should a discharge
line be added to the PRV 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 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 4. To install the PRV, a suitable fitting
connected to an extension on a "T" fitting can be sweated
to the hot water line.
COLD WATER
INLET
7

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