Components of the Johnston Boiler Flashcards
The Johnston Boiler operates on the same principles as the _________.
Way-Wolff Boiler
The water level control components either start and stop the feedwater pump or prevent the burner system from operating when there is ________ in the boiler for safe boiler operation.
Lack of Water
The ______ is also an important visual aid that is used constantly to ensure there is proper level in the vessel.
Sight Glass
Monitors steam pressure and starts and stops the burner as required by steam demand.
Operating Limit Pressure Control Switch
Provided as a safety back up limit should the operating limit pressure control fail. I t will shutdown the boiler at a higher set pressure than the normal operating pressure.
High Limit Pressure Control Switch
Controls the burner firing rate in relation to steam demand.
High/Low Firing Control Switch
Indicates the pressure in the boiler.
Steam Gauge
Consist of a fuel oil pump with built-in pressure regulator and a drive coupling with guard. The pump set supplies F/O at a regulated pressure to the oil gun.
F/O pump set
Provided to prevent contaminants from entering the F/O pump.
Inlet Fuel Strainer
Prevents the burner from starting in the event of oil pressure drop or shuts the burner off if it is firing.
Low Oil Pressure Switch
Controls the oil to the various oil nozzles.
Fuel Shutoff Soleniod Valves
Directs the oil into the furnace and atomizes the oil for efficient combustion.
Oil Gun Assembly
Used to support all burner components and to direct the combustion air towards the furnace.
Burner Housing
Supplies the combustion air to the furnace.
Forced Draft Fan Motor w/Mounted Blower Wheel
How many Fuel Solenoid Valves are on the Johnston Boiler?
4 Plus the Main F/O Solenoid Valve
What is behind the screen on the Johnston Boiler?
Air Inlet Damper
Controls the air supplied to the boiler.
Two blade inlet damper assembly with mechanical linkage
The amount of air supplied to the boiler depends on the number of ______ being fired.
Oil Nozzles
Used to position the air inlet damper as well as to control the various oil solenoid valves which supply oil to the burner gun.
Firing rate motor with auxiliary mounted switches
Imparts a spin to the combustion air for optimum mixing of atomized oil from the oil gun and air for efficient combustion.
Diffuser Swirler
The operating control panel is the electrical control center for the ________.
Boiler System
The _______ of the operating control panel contains indicating lights, control switches and alarm horns which control and monitor the boiler system.
Front Side
The ______ of the operating control panel contains two phone pin jacks which may be used for monitoring the direct current flame signal strength.
Bottom
The _______ of the operating control panel contain the door electric power interlock door latch and reset push button for the combustion control programmer.
Front Door
The ________ of the operating control panel contains the main disconnect switch, motor starters, fuses, control circuit transformers, control relays and the combustion control programmer.
Interior
On some boilers there is a cooling fan that has been installed in the door of the control panel. This aids in cooling the electrical components in the panel and thereby increasing ________.
Component Life
The Flame Safeguard System consist of 2 major components:
- Combustion Control Programmer
- Flame Sensor
An electric device which controls the burner start-up and shutdown sequences, as well as checking all the safety limits.
Combustion Control Programmer
A small device mounted on the burner front. It monitors infrared radiation from the main flame when burning and returns a signal to the combustion control programmer indicating whether or not these fires are satisfactory.
Flame Sensor
