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To regulate please do as follows:
A) open the thermostats' circuit (disconnect the connection thermostats lcable)
B) give voltage to the burner by closing the switches on the feeding line and the one on the burner. The control
box must not, be in "lock position", the control box fuse must be correctly at work and the cyclic relay must
be stand in start position.
ATTENTION : the following operations must be done with circuits under voltage, pay the utmost attention
when operating.
C) with the burner in above described conditions, act on the regulation screw of the cam "O" to obtain the comple-
te closing of the air shutter. In this position "O" cam must push on the relative micro-switch. Releasing the
screw, the air shutter moves towards closure. If the "close" position is overcome, the shutter opens in the op-
posite sense of the requested one (to remedy, tighten adequately the regulation screw and soon after let the
shutter open temporarily, by operating as described at point "E"). This position (closed shutter with burner at a
stand) is usually already regulated at factory. We remember once again that not all burners are equipped with
an electric circuit suitable to use this cam (see Note).
ATTENTION : the cam step MUST NOT GO further the position which causes the micro switch to get into
operation. If the micro-switch has not come to operation, the burner's control box stops in the "pre-
washing" position.
D) air regulation 1st stage (cam "ST1").
Disconnect the cable connected to the buckle N° 9 of the junction box of LKS 300 and connect it temporarily
to the buckle N° 3. Operating on the regulation screw of "ST1" cam, the displacement of the air shutter in the
desired position can be obtained. By screwing the air shutter opens, by releasing the air shutter closes.
E) air regulation 2nd stage (cam "ST2").
Disconnect temporarily the cable connected to buckle N° 3 (the same which was previously disconnected
from buckle N° 9) and connect it temporarily to the buckle N°7.
Operating on the regulation screw of "ST2" cam it can be obtained the air shutter displacement on the desired
position. By screwing the air shutter opens, by releasing the air shutter closes.
F) Return the temporarily disconnected wire to its terminal (No. 9).
G) The position of cam "MV2", which controls activation of the second stage fuel valve, can be adjusted by means
of the adjuster screws. The adjustment is usually carried out at the factory in the intermediate position between
"ST1" and "ST2".
NOTE: The cam "MV2" is integral with the "ST2"; therefore, modifying the adjustment of the latter ("ST2")
also modifies the position of "MV2".
H) Thus, after pre-adjustment of the position of the air damper, proceed with lighting the burner and adjusting the
combustion air supply for the 1
the air damper to close, and vice-versa.
N.B.:
1) When the wires coming from the outside of the LKS 300 motor are not connected to terminals 7-8-9 and 10 of the
motor, the electric circuit of the burner in question is not set for using cam "O". In this condition, it is obviously
unnecessary to adjust this cam ("O") because it is not operative, so its position is indifferent for the working of the
burner. In this case, during the pre-ventilation and stop of the burner, the air damper automatically sets itself in the
position corresponding to the 1
2) When the wires coming from the outside of the LKS 300 motor are connected to terminals 7-8-9 and 10 of the LKS
300 motor, the electric circuit of the burner is such that it uses cam "O"; therefore, the cam must be adjusted correctly
as described above. In this case, pre-ventilation occurs with the air damper open in the position corresponding to the
nd
2
flame and the air damper is automatically closed when the burner stops.
CONNECTRON AIR MOTOR LKS 300
REGULATION
st
nd
and 2
stages. Remember that slackening the cam adjuster screws will cause
st
flame.
21
N° 8639
Rev. 10/05/00
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