Biasi M90E.24S, Руководство по обслуживанию

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Electronic control p.c.b.
20
The following table gives the relationship between the
visible lamp indication and its meaning.
Boiler in stand---by condition.
(function control in
position).
A short pulse every 4 seconds
(function control in
position).
Anti---freeze system active.
Boiler ON condition
(function control in or
position)
1 second ON 1 second OFF
(function control in or
position)
Very fast pulses (4 per second)
Faulty boiler or irregular
operation as:
--- Empty primary circuit
--- No primary circuit flow
--- Lack of burner ignition
--- Lack of burner ignition
--- Excessive temperature in
the primary circuit.
--- Dip---switch 3 left in the OFF
position
--- Faulty temperature probe
f
Service operation
With the boiler switched ON ( or ), by moving and
re---setting to its original position any of the function se-
lectors 9 (Fig. 28), the Electronic control p.c.b. goes
into service operation mode and all the lamps (7 in
Fig. 28) are then activated.
To reset the Electronic control p.c.b. to the normal oper-
ation it is necessary to turn the knob
to the position
or switch off the boiler for a short while at the fused spur
isolation switch.
The following table gives the relationship between each
of the possible lamp combinations and their meaning.
Normally operating boiler
C.h. operation
D.h.w. operation
Frost protect operation
D.h.w. operation
Excessive temperature on primary circuit
Faulty c.h. temperature probe NTC
Faulty d.h.w temperature probe NTC
Faulty primary circuit
(no water or absence of flow)
Lack of burner ignition (no ignition signal from
the full seqence ignition device)
Ignition gas pressure adjustment
Minimum gas pressure adjustment
Lack of power supply or fauly electronic
control p.c.b. *
Fauly electronic control p.c.b. *
Lamp
OFF
Lamp
ON
Flashing lamp, alone
or simultaneously
with an other lamp.
Flashing lamp,
alternate with
another lamp.
* These conditions are normal only for a short time when the
power supply is applied to the boiler.
If permanent they indicate a faulty p.c.b.
9.5 Dip---switch selectors
The function selectors 9 (Fig. 28 and Fig. 31) are micro-
switches with which it is possible to select the various
boiler control function modes.
In Fig. 31 the selectors are illustrated in the configur-
ation in which the boiler is set in the factory (natural gas
boiler).
ON (1)
OFF (0)
1 2 3 4
9
Gas conversion
Ignition gas pressure adjustment
Reignition frequency
Minimum gas pressure adjustment
Fig. 31
f
Selector 1
This forces the boiler to operate at the minimum gas
pressure in order to allow the adjustment of the mini-
mum gas pressure at the burner (on the modulation op-
erator of the gas valve).