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4.6
Setting the thermoregulation (fig. 37-38-39)
The thermoregulation only operates with the external sensor connected;
once installed, connect the external sensor (accessory available on
request) to the special terminals provided on the boiler terminal board.
This enables the THERMOREGULATION function.
Selecting the compensation curve
The compensation curve for heating maintains a theoretical temperature
of 20°C indoors, when the external temperature is between +20°C
and -20°C. The choice of the curve depends on the minimum external
temperature envisaged (and therefore on the geographical location),
and on the delivery temperature envisaged (and therefore on the type
of system). It is carefully calculated by the installer on the basis of the
following formula:
envisaged delivery T. - Tshift
KT=
20- min. envisaged external T.
Tshift = 30°C standard installations
25°C floor installations
If the calculation produces an intermediate value between two curves,
you are advised to choose the compensation curve nearest the value
obtained.
Example: if the value obtained from the calculation is 1,3 this is between
curve 1 and curve 1,5. Choose the nearest curve, i.e. 1,5.
Select the KT using trimmer P3 on the board (see multiwire wiring
diagram).
To access P3:
- switch off the power supply
- remove the shell
- turning the instrument panel towards you
- unscrew the two screws of the small cover on the electronic board to
have access to the terminals.
b
Live electrical parts.
The KT values which can be set are as follows:
- standard installation: 1,0-1,5-2,0-2,5-3,0
- floor installation 0,2-0,4-0,6-0,8
and these are displayed for approximately 3 seconds after rotation of
the trimmer P3.
TYPE OF HEAT REQUEST
Boiler connected to room thermostat (JUMPER JP6 not inserted)
The heat request is made by the closure of the room thermostat
contact, while the opening of the contact produces a switch-off. The
delivery temperature is automatically calculated by the boiler, although
the user may modify the boiler settings. Using the interface to modify
the HEATING, you will not have the HEATING SET-POINT value
available, but a value that you can set as preferred between 15 and
25°C. The modification of this value will not directly modify the delivery
temperature, but will automatically affect the calculation that determines
the value of that temperature, altering the reference temperature in the
system (0 = 20 °C).
Boiler connected to a programmable timer (JUMPER JP6 inserted)
With the contact closed, the heat request is made by the delivery
sensor, on the basis of the external temperature, to obtain a nominal
indoor temperature on DAY level (20°C). With the contact open, the
boiler is not switched off, but the weather curve is reduced (parallel
shift) to NIGHT level (16°C).
This activates the night-time function.
The delivery temperature is automatically calculated by the boiler,
although the user may modify the boiler settings.
Using the interface to modify the HEATING, you will not have the
HEATING SET-POINT value available, but a value that you can set as
preferred between 25 and 15°C.
The modification of this value will not directly modify the delivery
temperature, but will automatically affect the calculation that determines
the value of that temperature, altering the reference temperature in the
system (0 = 20°C for DAY level, and 16°C for NIGHT level).
4.7
Adjustments
The boiler has already been adjusted by the manufacturer during
production. If the adjustments need to be made again, for example after
extraordinary maintenance, replacement of the gas valve, or conversion
from methane gas to LPG, observe the following procedures.
The adjustment of the maximum and minimum output, and of the
maximum heating and of slow switch-on, must be made strictly in the
sequence indicated, and only by qualified personnel only:
- disconnect the boiler from the power supply
- remove the shell
- turn the heating water temperature selector to its maximum, selector
in correspondance to "+" (fig. 40)
- turning the instrument panel towards you (fig. 7)
- unscrew the two screws of the small cover on the electronic board to
have access to the terminals
- insert the jumpers JP1 and JP3 (fig. 41)
- power up the boiler.
The display shows "ADJ" for approximately 4 seconds.
Next change the following parameters:
1 - Domestic hot water/absolute maximum
2 - Minimum
3 - Heating maximum
4 - Slow ignition
as follows:
- turn the heating water temperature selector to set the required value
- press the CO button (fig. 42) and then skip to the calibration of the
next parameter.
b
Live electrical parts.
The following icons light up on the monitor:
1.
during domestic hot water/absolute maximum calibration
2.
during minimum calibration
3.
during heating maximum calibration
4.
during slow ignition calibration
End the procedure by removing jumpers JP1 and JP3 to store these
set values in the memory.
The function can be ended at any time without storing the set values in
the memory and retaining the original values as follows:
- remove jumpers JP1 and JP3 before all 4 parameters have been set
- set the function selector to
- cut the power supply 15 minutes after it is connected.
b
Calibration can be carried out without powering up the boiler.
b
By turning the heating selection knob, the monitor automatically
shows the number of rotations, expressed in hundreds (e.g. 25 =
2,500 rpm).
The function for visualizing the setting parameters is activated by the
function selector in summer and in winter, by pressing the CO button on
the circuit board, either with or without request for heat.
This function cannot be activated when connected to a remote control.
Upon activating the function the setting parameters are visualized in
the order given below, each for 2 seconds. Each parameter is displayed
together with its corresponding icon and fan rotation speed measured
in hundreds:
1. Maximum
2. Minimum
3. Max. heating
4. Slow ignition P
5. Max. preset heating
.
GAS VALVE CALIBRATION
- Connect the boiler to the power supply
- Open the gas tap
- Set the function selector to
- Loosen the fixing screws (A, fig. 6) and remove the shell
- Release the panel and turn it forwards (fig. 7)
- Unscrew the two screws of the small cover on the electronic board to
have access to the terminals
- While the boiler is powered up, using a small screwdriver included,
press the CO button (fig. 42)
b
Live electrical parts.
- Wait for burner ignition. "ACO" appears on the display. The boiler
operates at maximum heat output. The "combustion analysis" function
remains active for a limited time (15 min); if a delivery temperature of
90°C is reached, the burner is switched off. It will be switched back on
when this temperature drops below 78°C.
- Insert the analyser probe in the ports provided in the air distribution
box, after removing the screws from the cover (fig. 43)
- Press the "combustion analysis" button a second time to reach the
number of rotations corresponding to the maximum domestic hot
water output (table 1)
value: (table 3) if the value does not match the value
- Check the CO
2
given in the table, use the gas valve maximum adjustment screw (A,
fig. 44)
- Press the "combustion analysis" button a third time to reach the number
of rotations corresponding to the minimum output (table 2)
Mynute Green E C.S.I. - R.S.I.
(OFF/RESET)
(OFF/RESET) (monitor off)
11
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