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3.
Ignition/Pilot
Gas-fired units are equipped with a spark ignited gas
pilot assembly. The gas pilot assembly includes a pilot
gas cock, gas pressure regulator, ignition transf o rmer,
and pilot solenoid valve.
4.
Forced Draft Fan
An integral fan assembly direct connected to a NEMA fan
motor supplies the required combustion air. As standard,
the fan motor is an open drip proof, high efficiency type,
operating at 3,450 RPM.
5. Air Proving Switch
An air pressure-sensing switch is mounted on the burner
to prevent fan or burner operation if sufficient air is not
available for proper combustion or pilot ignition.
6.
Fuel/Air Control
The control of combustion air is managed with an integral
inlet air damper operating as follows:
•
9-1/2 to 25 Horsepower
Mechanically fixed f o r the correct combustion air to
fuel ratio f o r ON/OFF firing.
•
30 to 50 Horsepower
Mechanically linked with the fuel valve and air
damper to provide fuel/air ratio at low fire and high
fire.
E. Fuel Train
The burner is equipped with factory mounted fuel safety
control and safety shutoff valves for either natural gas or
LP gas. Each fuel piping assembly is equipped, as a
minimum with the following:
1.
Gas Assembly
Boiler base rail mounted, piped and wired gas piping
assembly, consisting of main gas pressure regulator,
safety shutoff valves, manual shutoff cocks, fuel
input control valve, in accordance with the latest UL
and CSD-1 requirements.
F. Control Panel
A NEMA 1A enclosed {powder coated finish) control
panel is mounted integral to the burner or on an
independent bracket mounted on the boiler. This panel
contains as a minimum the following components:
1.
Boiler ON/OFF Switch
Provided to interrupt control power to the 120 volt
control circuit. Does not disconnect the main power
source.
2. Pump ON/OFF Switch
Provided to isolate the pump control circuit.
3. Terminals
Provided for the connection of the 120/1/60 volt supply
and f o r external connections for field wiring.
4. Relays
Water level control relays as described above.
5. Wiring/Controls
All devices and wiring are in accordance with the latest
UL/NFPA 70 requirements. Each device is UL listed or
recognized and bears the UL label or stamp.
6. Wiring/Controls
As standard, flexible conduit is used and as deemed
necessary or in accordance with specifications, thin wall
or rigid and seal tight may be used.
G. Combustion Safeguard
Solid State Control
1.
This pre-programmed solid state control is mounted
adjacent to the burner, and provides for the safe start
sequencing of the burner from start-up, run, normal
shutdown, and safety shutdown.
2.
UV Scanner
A flame-sensing device of the UV scanning principle is
furnished on all boilers. Status indicating lights are
furnished on the front face of this control for visual
indication of the burner/boiler operation.
H. Guarantees
Efficiency
1.
The boiler package is guaranteed to operate at a
minimum of 80% or greater, fuel input to steam pounds
per hour output efficiency.
2. Warranty
The complete package is warranted for a period of one
(1) year from the date of initial start-up or 18 months
from the date of shipment or notice to ship, whichever
occurs first.
3.
Damage
This guarantee does not include items that are
damaged due to circumstances of carelessness,
neglect, or operating the unit beyond its capacity and
rating.
6
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