Clayton Steam Generator model EO-100-1M
PAGE 16 / 70
Instruction Manual, doc.nr.: MAN18206 Rev A PSC
CHAPTER 4 :
ELECTRICAL SYSTEM & MAIN COMPONENTS
4.1
DESCRIPTION OF MAIN COMPONENTS
For the description of the main components, we refer to the electrical drawing(s). in the Clayton Binder
The last pages of these electrical drawings contain the function of the components.
4.2
OPERATION
4.2.1
GENERATOR ON
S10 =
POWER ON
S1
=
1-STOP -2- PUMP -3- BURNER -4- High FIRE
S02 =
RESET
All the alarms are wired in series. In case one of the alarms opens, it interrupts the power supply to burner
control and motor. Also the specific alarm relay is energized causing a second interruption of the circuit to
burner and motor. Exact cause of failure can be determined from alarm indication light on the control box.
From the
[LAL2]
combustion controller, via the normally closed contacts of the alarm relais, power is
transmitted via the "no air" contact of
[F81]
to the motor contactor.
(in case a boosterpump is connected, it
now starts).
The motor contactor or support relay -30" pre-purge at initial generator start. From this
contact power is transmitted to the burner switch
[S01 position burner ]
4.2.2
BURNER ON
- S01
=
Burner position
When the switch
[S01]
is placed in the burner position, power is transmitted through steampressure switch
[F20]
to combustion controller, initiating the start-up of the burner.
.
Now the ignition transformer is energized.. Burner should ignite within 2" and the flame detected by the
[UV-B3
]flame scanner. Now the burner operates at low fire. Combustion air rate and waterpump rate are at
50%. Waterpump runs at low speed and
MOTOR AIR DAMPER
[M83
]. is energized
4.2.3
BURNER MODULATION
S01
=
Position high fire
When
[S01]
and steampressure switch
[F22]
are closed and after the high fire delay of +-25 seconds, the air
damper is opened, switching on the high fire oil valve
[Y43]
. At same time the waterpump operates at full
capacity
.( motor at high speed)
When steampressure reaches set point of the modulating steampressure switch
[F22],
this switch opens and
the high fire oil solenoid valve is de-energized. Simultaneously the waterpump operate at half capacity,
low
speed ,
also the air damper
[M83]
is energized restricting the air flow to the burner to half rate. This pressure
switch is normally set to o/- 1 bar below the steam operating pressure switch
[F20.]
4.2.4
BURNER STOP AT MAXIMUM STEAM OPERATING PRESSURE
At maximum steam operating pressure, pressure switch
[F20]
opens the circuit to the combustion controller,
causing the oil valves
[Y42 & Y43]
to close and the combustion controller to cycle to its start position.
Simultaneously the waterpump stops.. When steam pressure has /- 1 bar
[F20]
restarts the burner and
waterpump according the program described previously.
For this manual the electrical drawing is
SW-3192