AquaStar 125B LPS Installation And Operating Instructions Manual Download Page 7

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WARNING: Failure TO INCREASE THE VENT SIZE TO
SIX INCHES AND/or assure that the manifold pressure is
set to proper value listed for applications at high altitudes
will cause unsafe venting, asphyxiation, and will void IAS
Certification.

GAS CONNECTIONS and Gas Regulator

Before connecting the gas supply, check the rating plate
on the right side of the front cover to be sure that the heater
is rated for the same gas to which it will be connected.
In the United States: The installation must conform with
local codes or, in the absence of local codes, the National
Fuel Gas Code ANSI Z223.1/NFPA 54.
In Canada: The Installation should conform with CGA B149
INSTALLATION CODES and /or local installation codes.
NOTE: The Aquastar 125 B”S” is supplied with a gas
pressure regulator that must be installed on the heater
before attaching the gas supply line. See figure 4.
Failure to install the gas regulator as shown in figure
4 will be a violation of IAS 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.

GAS LINE SIZE

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 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 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 less 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 emergency
malfunction of the supply system, the gas valve and
regulator must be checked for safe operation. Make sure
that the regulator vent is protected against blockage. Vent
blockage could occur during ice storms.
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

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
125B”S” is provided with two water connection adapters
that must be connected to the inlet and outlet fittings of
the water valve as shown in Fig 5. These fittings 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. A ball valve should
be installed on the cold water feed line to facilitate servicing
the heater.

Fig. 4 - Installation of 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 test pressure nipple on the gas
inlet pipe just above the regulator (See Fig 4). 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.