User guide

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3-9
SECTION 3 FTCS-IOM-2013-1114 OPERATION
! 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.
continue to circulate  uid.
9. When pressures have stabilized, start burner again.
10. Continue in this manner up to the maximum operating temperature.
Throughout the initial warm-up, the expansion tank and its over ow pipe
must be watched to detect the formation of steam, indicating the presence of
water. If this occurs, burner should be shut down.
11. If steam is forcing thermal  uid out of the expansion tank vent, turn the
heater o , but leave the pump on. This is to circulate the hot  uid through the
piping without  ushing the steam too quickly. Once steam and thermal  uid
stop leaving the expansion tank unit, the heater can be turned on. Increase
the temperature very slowly to prevent  uid from being forced out of the
tank.
12. Continue bringing unit up to temperature slowly, with a temperature rise not
exceeding 100°F (38°C) per hour. Do not exceed speci ed maximum outlet
temperature. In the absence of speci c information, consult the factory before
proceeding.
13. Once up to temperature, check the  uid level in the expansion section by
opening the high level manual test connection. If a permanent  ow of  uid
results when this valve is opened, and if all previous precautions have been
followed, the expansion tank is too small for the capacity of the  uid in the
installation. A larger tank must be installed.
14. After  fty hours of operation at operating temperature, check all  anges and
connections for tightness.
 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 regulator and supply
a step-down regulator if required.
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