Flame relay PFF 704
Application
To detect and signal an existing gas flame using flame rod or UV detector.
For use with multi-burner control on burner control units PFS 778 M or
where automatic monitoring is not required.
Function
The PFF 704 has four independent flame amplifiers. When a flame is
present the amplifier energizes a relay. The contacts of this relay can be
used for control func tions.
- For flame detection
- For multi-burner control
- Flame monitoring with flame rod or UV detector
- Four independent flame amplifiers
- Single-electrode operation possible
Application
To detect and signal an existing gas flame using flame rod or UV detector.
For use with multi-burner control on burner control units PFS 778 M or
where automatic monitoring is not required.
Function
The PFF 704 has four independent flame amplifiers. When a flame is
present the amplifier energizes a relay. The contacts of this relay can be
used for control func tions.
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Principle of
multi-burner control
Multi-burner control involves
the joint control of several
burners.
One burner control unit is
responsible for the entire
control function and also
monitors the first burner. Flame
relays monitor the other
burners in this group.
If a flame monitored by the PFF
704 goes out during operation,
a signal to the automatic control
is interrupted and all other
burners are switched off
immediately. If an outside light
is detected before the ignition
(no flame check), the system
goes to lockout.
The drawing shows an example
with flame rod. UV monitoring or
single-electrode operation is
also possible.
multi-burner control
Multi-burner control involves
the joint control of several
burners.
One burner control unit is
responsible for the entire
control function and also
monitors the first burner. Flame
relays monitor the other
burners in this group.
If a flame monitored by the PFF
704 goes out during operation,
a signal to the automatic control
is interrupted and all other
burners are switched off
immediately. If an outside light
is detected before the ignition
(no flame check), the system
goes to lockout.
The drawing shows an example
with flame rod. UV monitoring or
single-electrode operation is
also possible.
Multi burner control with five burners
(direct spark ignition shown)
(direct spark ignition shown)
Products - Burner Controls Automatic- PFF 704