Water Connections; Operating Instructions - Bosch 125HX LP Installation And Operating Instructions Manual

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 125HX is provided
with two connectors that must be connected to the inlet
and outlet fittings of the water valve as shown in Figs 5 and
6. ½" copper or brass fittings work best when connected to
the connectors. See Fig 6.
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. 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.
WATER FILTER
WASHER
INLET
OUTLET
Fig. 5 - Water valve - top view
THREADED ASSEMBLY
1/2" FLEX
PIPE PRV TO
APPROPRIATE
DISCHARGE
Fig. 6 - Plumbing connections for the Aquastar
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 installed such
that it allows complete drainage of both the PRV and the
line.
6 720 606 562 (02.03)
WATER VALVE
SWEATED ASSEMBLY
1/2" FLEX
PIPE PRV TO
APPROPRIATE
DISCHARGE
125HX
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 7. To install the PRV, a
suitable fitting connected to an extension on a "T" fitting
can be sweated to the hot water line.
Fig. 7 - Pressure Relief Valve

OPERATING INSTRUCTIONS

Before proceeding with the operation of the heater make
sure that the system is filled with water.
Open the cold water inlet supply to the heater fully.
Open a hot water faucet to permit the water to fill the heater
and the piping and to eliminate the air trapped in the system
Close the hot water faucet after the water flows freely and
all the air has escaped from the system. The water heater
is now ready to operate.
FOR YOUR SAFETY READ BEFORE
OPERATING YOUR HOT WATER HEATER
Warning: If you do not follow these instructions exactly,
a fire or explosion may result causing property
damage, personal injury or loss of life.
A. This appliance is equipped with electronic ignition for
lighting the pilot and main burners. When turning the heater
on, follow these instructions exactly.
B. Before operating the unit, set the On/Off switch to the
On ( ) position. The On/Off switch is located behind
the flip-down coverplate on the front panel strip. Smell all
around the appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air and will
settle on the floor.
WHAT TO DO IF YOU SMELL GAS
- Do not try to light any appliance.
- Do not touch any electric switch; do not use any phone
in your building
- Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
- If you cannot reach your gas supplier, call the fire
department.
C. Use only your hand to push in the on/off control button.
Never use tools. Follow these instructions exactly. If control
button is jammed, close the gas supply and call a qualified
service technician. Attempted forceful repair may result in
a fire or explosion.
D. Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the control
system and any gas control which has been under water.
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