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fan thermostat, normally open, to automatic start and stop
the fan when the average air outlet temperature reaches a pre-set value. The set
point is fixed by moving the second lever in a scale plate, placed inside the Fan-
Limit casing. The setting value is at 30°C . Setting this value over, a delay on fan
starting may be caused , so increasing fuel consumption and impairing the long life
of the heater. On the cooling phase, the thermostat stops the fan at about 8°C,
lower his starting point.
Fan thermostat has a white button that must be always kept
pulled-on, otherwise the ventilator keeps running.
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Security limit thermostat for the burner, normally closed
with manual reset, to automatic stop the burner in case the average air outlet
temperature overheat above the pre-set value. The set point at 100°C, is fixed by
the manufacturer with the third set point lever right side in the scale plate inside the
Fan-Limit.
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. The LIMIT2, when intervening ,
stops the burner, while the fan keeps turning to cool the heat exchanger. To reset
the burner, first wait the air outlet temperature drops down; than remove, the
plastic cap of the reset button, placed on the casing cover, then push this reset red
button .
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Temperature limit thermostat for the burner, normally closed , to
automatic stop the burner when the average air outlet temperature exceeds the
pre-set value. The set point, fixed by the manufacturer inside the casing, is at
70°C; and can be increased maximum at 80°C. The burner reset is automatic,
when air outlet temperature drops of about 8°C, below his set point.
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when LIMIT2 intervene, be sure the cause is not:
½
a lower air delivery due to obstructions on the inlet or outlet air system, air filters, if
any dirty...
½
a stop of the heater from the main switch or a black-out
½
a fire dumper intervention
½
a sensor bulbs bending down towards the heat exchanger, that anticipate the
LIMIT2 intervention.
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During the first ignition check the position of the sensor bulbs are not
bending down towards the heat exchanger and doesn’t touch the heat exchanger itself, as
this would affect the sensitivity of the thermostats and anticipate the LIMIT2 intervention.
For Honeywell
1) Fan connection
2) Security LIMIT2 connection
3) FAN off pointer
4) FAN on pointer
5) LIMIT2 pointer to stop burner
6) Hold dial when setting pointer
7) Female receptacle: push screw
driver to insert wire
8) Red boutton for reset the security
LIMIT2
16
Summary of Contents for AS EX
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