For your safety read before
operating your 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 employs a piezo-igniter to light the
pilot burner. When lighting the pilot, follow these
B. What to do if you smell gas.
WHAT TO DO IF YOU SMELL GAS
B Do not try to light any appliance.
B Do not touch any electric switch; do not use any
phone in your building.
B Immediately call your gas supplier from a neighbors
phone. Follow the gas supplier's instructions.
B If you cannot reach your gas supplier, call the fire
C. Use only your hand to push in the gas control
buttons. Never use tools. If a button will not push in,
check to make sure the buttons are being pushed in the
proper sequence. Follow these instructions exactly. If
control button(s) are jammed, close the heater's
individual manual shutoff valve and call a qualified
service technician. Forced or attempted 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
B 1. STOP! Read the previous safety information.
B 2. The gas valve must be turned off by sliding the gas
valve button to all the way to the left.
B 3. Wait five (5) minutes to clear out any gas. If you
smell gas, STOP! Follow "B" in the safety information
above on this plate. If you don't smell gas, go to next
B 4. The pilot burner is located behind the peephole in
the front center of the cover directly below this
B 5. Open the sliding viewer window.
• 6. Slide the gas valve button to the right, under the
• 7. Fully depress gas valve button and light pilot by
pushing the button marked
to be repeated.
. This step may have
B 8. Observe the pilot flame through the peephole. The
gas valve button should be held down for at least 15
seconds with pilot burning. When the gas valve
button is released, the pilot should continue to burn.
- If the gas valve button does not pop up when
released, stop and immediately call your service
technician or gas supplier.
- If pilot does not stay lit, repeat steps 1 through 8.
- If pilot will not stay lit after several tries, slide the gas
valve button all the way to the left and call service
technician or gas supplier.
B 9. Once pilot remains lit, release the gas valve button.
The heater will now fire at minimum power when
water is drawn at a rate greater than the threshold
Note: If main burner should fail to ignite, make sure pilot
is burning. If not, repeat lighting steps 1 through 8.
Note: The 125BO operates in two modes. See
SETTING THE WATER TEMPERATURE.
installation, existence of air in the
gas supply line and in the water
line may cause some ignition
delay. In that case, repeat the
ignition process until all the air
has been purged.
To turn off appliance
B Slide the gas valve button all the way to the left and
turn off the manual gas valve on the supply line to the
Setting the water temperature
The 425 HNO has a gas control that modulates burner
input in response to flow. Its purpose is to ensure that
the hot water temperature will remain steady, although
the water flow demand might vary. The output
temperature adjustment knob or the gas control slide.
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