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OPERATION DESCRIPTION
TBG 45/60 PV burners work in progressive/modulating two stage
operation, the gas train provided is composed of an ON/OFF type
safety valve and a single stage slow opening main valve.
Adjusting the air flow rate is performed using the combined actions
of the air shutter activated by the servomotor (1) (0002933651) and
the inverter (2) which drives the rotation speed of the electric motor
hence varying the air flow produced by the fan.
The gas flow adjustment is carried out using the main valve,
equipped with a device to proportionally adjust the air/gas ratio.
The inverter allows the programming of three rotation speeds for
the electric motor:
V1: rotation speed in relation to the minimum power
Vs: rotation speed in relation to the ignition stage
V2: rotation speed in relation to the maximum power
To adjust the V1, Vs, V2 speeds consult section: “Instructions for
adjusting the frequency of the inverter output”.
When the main switch is closed, if the thermostats are closed, the
voltage reaches the command and control equipment which starts
the boiler (LED 19 on).
This turns on the fan motor for preventilation of the combustion
chamber. During the preventilation phase the motor goes to speed
V2.
At the same time, the rotation of the servomotor (1) puts the air
shutter into the open position corresponding to the maximum
power setting.
At the end of the preventilation phase the air shutter goes to the
ignition position (for the adjustment of the ignition cam of the
servomotor refer to table 0002933651).
!
The flow rate of gas in the ignition stage should generally
be greater than the minimum flow modulation.
Meanwhile the inverter turns the motor at the Vs speed programmed
for the ignition stage.
The ignition transformer will cut in and, after two seconds, the gas
valves open
The presence of the flame, detected by the control device, permits
continuation and completion of ignition, turning off the ignition
transformer.
Then the servomotor opens the air shutter gradually, the inverter
increases the rotation speed of the motor up to V2 and the pneumatic
valve allows an increase in the gas flow up to the maximum set value.
In the event that the control device does not detect the presence of
a flame, the control box activates a “safety shut down” (LED 20 on)
within 3 seconds of the opening of the main gas valve. In “safety
lock-out” mode the valves are closed again immediately. To release
the appliance from safety lock-out mode, press the lockout reset
button (21) on the electrical panel.
Summary of Contents for TBG 45 PN-V
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