Owner's manual

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SECTION 3 HPN-IOM-2014-0416 OPERATION
3-9
! WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct,
and strict adherence to applicable
jurisdictional/professional codes and
regulations.
A quali ed installer, service agency
or the gas supplier must perform
installation and service on the fuel
delivery system.
During system boilout, it is imperative
that all system legs or paths are open
to ensure  ow throughout the system.
Never open a cool or unheated user
leg of a system when the rest of the
system is above 210 F ( 99 C).
Do not attempt to start the
equipment for any testing prior
to  lling and purging the vessel.
A dry  re will seriously damage
the equipment and may result in
property damage or personnel injury
and is not covered by warranty. In
case of a dry  ring event, shut o
the fuel supply and allow the vessel
to cool to room temperature before
 uid is reintroduced to the pressure
vessel.
When opening any drains on the
equipment or piping system, steps
should be taken to avoid scalding/
burning of personnel due to hot
 uids. Whenever possible, the system
should be cooled prior to opening any
drains.
Use only your hand to turn valve
handles. Never use tools. If the
handle will not turn by hand, don’t try
to repair. Forced or attempted repair
may result in  re or explosion.
 Combustion
Before  ring the heater familiarize yourself on the use of the controls, lighting,
and shutdown procedures.
 SEQUENCE OF OPERATION FOR GAS FIRED BURNERS
The burner is of forced design. The sequence of operation is as follows:
1. The  ame programmer opens the main gas valve once stable pilot  ame is
established.
2. Pressure regulators on both the pilot and main gas supply, supply pressure to
the proper level.
NOTE:  Note the maximum inlet pressure rating of each fuel train and supply a
step-down regulator if required. Consult the Fulton Companies if uncertain of the
maximum inlet pressure requirements.
3. Combustion air is delivered by a centrifugal blower fan. An air switch monitors
the pressure and is part of the  ame programmer safety interlock circuit.
4. The  ame programmer monitors the safe operation of the burner. Functions
include pre-purge of the combustion chamber, provision of ignition via the
ignition transformer and electrode, opening the pilot gas valve, monitoring
the pilot  ame signal via the  ame sensor, opening main gas valves and
providing post-purge of the combustion chamber.
5. The  ame is monitored by a  ame sensor. In the event of insu cient,
unstable, or non existent pilot or main  ame, the  ame sensor will cause a
safety lockout of the  ame programmer. Safety lockout can also be caused if
the  ame sensor is improperly positioned or grounded. After fault has been
corrected, reset by pressing the reset button on the casing of the burner
control box.
 MODULATING BURNER
The function of the  ame programmer must be greatly extended in a modulated
system. Along with limit controls, operating controls and interlock devices, the
programmer automatically controls the operation of the burner, blower motor,
ignition, main fuel valves and modulating motor (or servo motors).
The sequence of operation is as follows:
1. Beginning with power on, limit switch closed, fuel valves closed, and
modulating limit controller closed and calling for heat, the  ame
programmer begins its cycle and the blower motor starts prepurge.
The modulating circuit closes, driving the air dampers to maximum for
prepurge.
2. The air  ow proving switch must be closed now. After timed prepurge,
the modulating motor (servo motor) drives the air damper to its low  re
position. All start interlocks must be proven or the  ame programmer will
lockout.
3. (Units with Gas Pilot) Ignition and pilot are energized and a timed trial for