INSTALLATION INSTRUCTIONS AND MAINTENANCE
1. Important notes
– The controls must be installed by qualified personnel
only. The relevant national regulations have to be
observed.
– On commissioning the wiring has to be carefully check-
ed according the appropriate diagram, Incorrect wiring
can damage the unit and endanger the installation.
– The fuse rating has to ensure that the limits specified in
TECHNICAL DATA will not be exceeded. If these precau-
tions are not observed, the effect of a short circuit can
cause severe damage to the control and installation.
– For safety reasons a minimum of one control shutdown
per 24 hours has to be observed.
– Disconnect the mains before the control box is plugged
in or out.
– The control box is a safety device and must not be
opened!
2. Function control
For safety reasons the flame detection system should be
tested on commissioning the installation as well as after a
service or longer shut-down.
a) Start-up with closed gas valve
– After lock out safety time is over the unit has to go into
lock out mode!
b) Normal start-up, when burner is running, close gas valve
– After loss of flame, the control box has to go into
lockout mode
c) Normal start-up, during pre-purge or operation, interrupt
the air proving switch
– The control box has to perform a lockout immediatly
d) Bridged air proving switch before start
– the fan motor switches on for approx. 2 - 3 secs,
followed by a lockout. After 10 secs., this quick
lockout is resetted by the control box and a second
start attempt follows (fan motor switches on for approx.
2 - 3 secs.). A standard lockout appears if the air
proving switch (LW) contact is still in it’s closed
position (e.g. welded contacts). Has the air proving
switch (LW) changed to it’s open position in the
meantime (e.g. by a run down motor), a normal start
sequence follows.
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