0108RPVDGBEN
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6.4.4
If the burner has not lit within 5 seconds, the
electronic flame relay will switch off and lockout
will occur. This will cause the signal lamp to
glow within the reset push-button on the
appliance and/or on a remote control if fitted).
After 10 seconds the reset button on the
appliance or the remote control can be activated
in order to reset and restart the appliance.
6.4.5
Flame failure protection is by the ionisation
principle i.e. the ability of a suitable flame to
pass an electrical current between the igniter and
the earthed burner assembly. To check the flame
current is adequate, remove jumper between
terminal 17 and 18 on the automatic burner
control, connect a DC micro ammeter between
the terminals. Ionisation current should be
≥
2
µ
A.
Caution: The terminals carry mains voltage when
energised.
6.4.6
Simultaneously to the ignition circuit and gas
valve circuit being energised, electrical power is
supplied to an anticipator within the air
circulation thermal fan control. The air circulation
fan will start after about 2 minutes and warm air
at a temperature of approximately 40
°
C is now
discharged from the appliance.
6.4.7
In the event of the combustion air volume falling
below a safe level, the burner will be
extinguished a re-start cycle will commence after
adequate combustion air volume has
been restored.
6.4.8
If the burner flame is extinguished for any reason
during a run cycle, an automatic attempt for re-
ignition will take place, if the burner does not
relight then safety shut down and lockout will
occur. Manual intervention to reset is necessary
to put the air heater back into service.
6.4.9
In the event of overheating for any reason,
thermally activated fail safe overheat controls
operate to switch off the burner.
The first control (LC1) switches off the burner
and upon its cooling, automatically resets and
the lighting sequence starts automatically.
The second control (LC3) which operates at a
higher temperature setting, will switch off the
burner and itself set to a lockout condition which
also requires manual intervention to reset to
restore the heater to operational condition. A
cooling time of ± 1 minute is necessary before
thermal re-setting can be carried out
6.4.10 When the set temperature or the heating time
period has been reached, electrical power to the
burner relay will be switched of and the burner
will extinguish. The air fan will continue to run
until the heat exchanger has been cooled down
to a safe level.
6.4.11 To turn off the air heater for a short period,
a. turn room thermostat to lowest setting.
To relight reset thermostat.
For prolonged period;
a. turn room thermostat to low setting,
b. turn gas supply to the appliance off.
c. switch off electricity supply to the air heater
after air circulation fan has stopped
.
To relight follow lighting instructions.
6.4.12 The gas service tap must only be operated in
emergencies, for servicing or prolonged periods
of shutdown of the air heater.
