23
Nitride Ignitor.
From the time the Silicon Nitride Ignitor’s power is shut off,
11.
the Ignition Control Board waits 3 more seconds to monitor
the Flame Sensor.
If the Flame Sensor does not detect a strong enough
fl
ame,
12.
the Ignition Control Board shuts off the Gas Valve and allows
the Exhaust Inducer to purge the unit for 20 seconds. At that
time, the Ignition Control Board restarts with step 7. It will try
and ignite the main burners 2 more times. If the unit does not
light, the Ignition Control Board will wait one hour and then
restart at step 3. This cycle will continue until the unit lights
or the power is shutoff to the unit.
If the Flame Sensor detects a strong
fl
ame, the Ignition Control
13.
Board will allow the unit to operate until the thermostat is
satis
fi
ed.
Once the unit is satis
fi
ed, the Ignition Control Board will shut
14.
off the Gas Valve and the unit will be in standby mode until
another call for heat is initiated by the thermostat.
See the
fl
ow chart on page 31 for more information.
The following information will describe the Sequence of Operation for
this appliance.
Switch power on to unit.
1.
Thermostat calls for heat.
2.
Ignition Control Board performs diagnostic check on system
3.
components.
On completion of diagnostics check, the Ignition Control Board
4.
sends signal to Exhaust Inducer.
Exhaust Inducer begins drawing air through appliance closing
5.
the Prover Switch.
On completion of Prover Switch engagement, the Ignition
6.
Control Board begins the ignition cycle.
The Ignition Control Board provides power to the Silicon
7.
Nitride Ignitor.
The Silicon Nitride Ignitor heats up for approximately 17 to
8.
20 seconds.
At the end of Silicon Nitride Ignitor’s warm-up, the Ignition
9.
Control Board opens the Gas Valve.
From the time the Gas Valve opens, the Ignition Control
10.
Board waits 3 seconds and then shuts off power to the Silicon
IMPORTANT
A quali
fi
ed person must perform the initial
fi
ring of the heater. At
this time the user should not hesitate to ask the individual any
questions which they may have in regard to the operation and
maintenance of the unit.
An Operational Checklist is included at the rear of this manual. By using
this checklist the user may be able to make minor operational adjustments
and avoid unnecessary service calls. However, the user should not
attempt repairs which are not listed under the USER column.
GENERAL
NEVER OPERATE THE HEATER WITHOUT FIRST BEING CERTAIN
IT IS FILLED WITH WATER AND A TEMPERATURE AND
PRESSURE RELIEF VALVE IS INSTALLED IN THE RELIEF
VALVE OPENING OF THE HEATER.
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL
TO SHUT OFF, TURN OFF THE MANUAL GAS CONTROL VALVE
TO THE APPLIANCE.
Before proceeding with the operation of the unit make sure
the water heater and system are
fi
lled with water and all air is
expelled.
FILLING
Close the heater drain valve by turning handle clockwise.
1.
Open a nearby hot water faucet to permit the air in the system
2.
to escape.
Fully open the cold water inlet pipe valve allowing the heater
3.
and piping to be
fi
lled.
Close the hot water faucet as water starts to
fl
ow.
4.
The heater is ready to be operated.
5.
OPERATION
THE GAS VALVE MUST HAVE BEEN IN THE OFF POSITION FOR
AT LEAST 5 MINUTES. This waiting period is an important safety
step. Its purpose is to permit gas that may have accumulated in the
combustion chamber to clear. IF YOU DETECT GAS ODOR AT
THE END OF THIS PERIOD DO NOT PROCEED WITH LIGHTING.
RECOGNIZE THAT GAS EVEN IF IT SEEMS WEAK, MAY
INDICATE PRESENCE OF ACCUMULATED GAS SOMEPLACE
IN THE AREA WITH RISK OF FIRE OR EXPLOSION. SEE THE
FRONT PAGE FOR STEPS TO BE TAKEN.
All gas and water lines leak tested and open.
Read SEQUENCE OF OPERATION section of this manual prior
to lighting and operating this appliance.
With above conditions satis
fi
ed, start the unit in accordance with
the instructions on the operating label attached to the heater. For
your convenience a copy of the instructions are shown of page
31. Each heater is equipped with an ignition control board. The
controller will try three times to light the main burner before going
into lockout. After the controller tries three times, it will wait one
hour before trying to light the unit again. This cycle will continue
until the main burners are ignited or the unit is shut down.
ADJUSTMENTS
ON INITIAL STARTUP SOME ADJUSTMENTS ARE NECESSARY.
CHECK MANIFOLD AND INLET GAS PRESSURES.
1.
CYCLE CHECK - CHECK AT LEAST ONE BURNER OPERATION
2.
- WHEN THERMOSTAT IS SATISFIED, BURNER WILL SHUT
OFF AND INDUCER WILL STOP RUNNING. ON CALL FOR
HEAT - THE INDUCER WILL COME ON AND CLOSE THE
PRESSURE SWITCH AND THE IGNITION SEQUENCE
DESCRIBED ABOVE WILL BEGIN, SEE “SEQUENCE OF
OPERATION”.
SEQUENCE OF OPERATION
