2
TECHNICAL FEATURES
1. Flame detection
The following types of flame detectors are suitable:
- Ionisation probe, temperature resistant material, well
insulated (material and insulation same as for ignition
electrode).
- IRD 1020.1 infra-red flicker detector
Flame detection using an ionisation probe is only possible
in conjunction with mains supplies which provide a neu-
tral earth connection.
The ionisation rod has to be installed in a way that
the distance to the ignition electrode is big enough
to prevent the spark to jump to the ionisation rod.
2. Safety
In terms of design/construction and programme sequence,
the TFI 812 control boxes conform to the presently appli-
cable European standards and regulations.
3. Installation
At the baseplate:
– 3 earth terminals with additional terminal for burner
earthing
– 3 neutral terminals with internal permanent connection to
neutral terminal 8
– 2 independant spare terminals (S1 and S2)
– extra terminals A, B and C are standard (wiring base S98
12-pin)
– 2 slide-in plates and 2 easy knock out holes plus 2 knock
out holes in the base bottom faciliate the base wiring
Please note
To assist trouble-free operation the main neutral
connection terminal 8 in the wiring base must be
fully tightened. The terminal screws are already in
the undone position. To connect a wire to the
terminal, the screw only needs to be fastened.
General:
- Can be mounted in any position, insulated as per IP 44
standard (unaffected by water spray).
The control box and detector probe should not, however,
be subjected to excessive vibration.
- The applicable installation regulations must be observed
during installation.
COMMISSIONING AND MAINTENANCE
1. Important notes
- The wiring must be checked exactly when commissioning
the installation. Incorrect wiring could damage the con-
trol box, putting the safety of the burner system at risk.
- The chosen fuse rating must not, on any account, be
higher than the value given in the technical data. Failure to
observe this instruction could, in the case of a short circuit,
have serious consequences for the control box or burner
system.
- For safety reasons, it must be ensured that the control box
performs at least one normal shut-down during every
24 hour period.
- Switch off or disconnect the power before plugging in or
unplugging the unit.
- Burner control boxes are responsible for the safety of the
system and should not be opened.
2. Routine checks
On commissioning or after servicing the burner system, or
if the system has not been in operation for a long period, a
check of the safety-relevant control box functions must be
made.
a) Attempt to start with gas valve closed:
- At the end of the safety interval
-> Lockout
b) After a normal start, with the burner in operation, close
the gas valve:
- At the end of the safety interval, system attempts to
restart
-> Lockout
3. Possible faults
Burner does not start:
- Fault in electrical supply, thermostat OFF
- Mains voltage too low
Switches to lockout after attempted start without establishing
flame:
- No ignition or no fuel reaching burner
- Flame signal during the pre-purge phase
- Mains voltage more than 15% below nominal value
Burner starts, flame is established but control box switches
to lockout after elapse of safety interval:
- No flame signal or signal too weak
- Flame detector dirty or defective
TFI 812