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MYNUTE GREEN C.S.I. - R.S.I.
For AL41 faults
If the pressure on the water gauge located on the control panel is less than
0.5 bar, proceed as follows:
• Turn the function selector to
• For C.S.I.: fill slowly by opening the filling tap (Fig. 8.1) until the pointer of
the water gauge lies between 1 and 1.5 bar (Fig. 8.3).
• For R.S.I.: fill the system until the pressure indicated on the water gauge
lies between 1 and 1.5 bar (Fig. 8.3).
• Move the function selector to the desired position.
In case of frequent pressure drops, call in the Technical Service Centre.
Only for C.S.I.: AL60 fault
The boiler works regularly but does not ensure the stability of the hot water
temperature which, however, is delivered at a temperature of approximately
50°C.
Contact the Technical Assistance Centre.
Fault code 91
The boiler has a self-diagnosis system which, on the basis of the hours
totalised in particular operating conditions, signals the need for maintenance
or cleaning of the primary exchanger (alarm code 91). After cleaning using
the kit supplied as an accessory, reset the hour counter as follows:
- disconnect the mains power supply
- pull out handle A (Fig. 12.17)
- switch on the boiler by pressing and holding down button B (Fig. 12.17)
for at least 4 seconds
- to check the counter has been reset, switch the boiler off and back on
again; after all the digit segments have lit up, the counter value will be
displayed.
To check the number of hours, multiply the value by 100 (e.g.: value
displayed 18 = 1800 hours totalised – value displayed 1= 100 hours
totalised).
N.B.: perform the counter reset procedure every time the primary exchanger
is thoroughly cleaned or replaced.
12.4 - Boiler configuration
The electronic board contains a series of jumpers (JP4) that can be used to
configure the boiler; access these by loosening the fasteners B (Fig. 7.2) and
removing the control panel cover A (Fig. 7.2) after turning off the main switch.
JUMPER IN POSITION 1:
pre-selection of the most suitable heating temperature adjustment field
according to the type of system.
Jumper not inserted - case A
Standard system 40-80°C
Jumper inserted - case B
Floor system 20-45°C.
The boiler has been factory-configured for standard systems.
For C.S.I. models (Fig. 12.14):
JUMPER IN POSITION 2: (unused)
JUMPER IN POSITION 3: (unused)
JUMPER IN POSITION 4: (unused)
JUMPER IN POSITION 5: COMBINED
JUMPER IN POSITION 6: (unused)
For R.S.I. models (Fig. 12.15):
JUMPER IN POSITION 2: (water tank with probe)
JUMPER IN POSITION 3: (water tank with thermostat)
JUMPER IN POSITION 4: (unused)
JUMPER IN POSITION 5: (unused)
JUMPER IN POSITION 6: (unused)
The boiler is supplied standard with the jumper in position 3 (water
tank with thermostat); if you wish to use an external water tank with
probe, move this jumper from position 3 to position 2 (case C, Fig.
12.15).
13 - SETTING THE THERMOREGULATION
Heat adjustment only works with the external probe connected, therefore,
after installation, connect the external probe to the relative connections on
the boiler terminal board.
This enables the THERMOREGULATION function.
Selecting the offset heating curve (Fig. 13.1)
The offset heating curve maintains a theoretical ambient temperature of
20°C at external temperatures ranging from +20°C to -20°C. The choice of
the curve depends on the rated minimum external temperature (on the
geographical area, therefore) and the rated delivery temperature (on the
type of system, therefore) and must be carefully calculated by the fitter
using the following formula:
KT =
Tshift = 30°C standard systems
25°C floor systems
12
(Fig. 12.10).
Nominal delivery T. - Tshift
20 - min. rated external T.
If the calculation generates an intermediate value between two curves,
choose the nearest offset heating curve to that value.
E.g.: if the value obtained by the calculation is 1.3, it lies between curve 1 and
curve 1.5. In this case, select the nearest curve, i.e.: 1.5.
Select KT by turning the trimmer located under the domestic hot water tempe-
rature knob (A, Fig. 13.2).
The settable values of KT are:
• standard system: 1,0-1,5-2,0-2,5-3,0
• floor system: 0,2-0,4-0,6-0,8
Type of heat request
If an ambient thermostat is connected to the boiler (parameter 51 = 0 -
manufacturer's default setting) (Fig. 13.3)
The ambient thermostat makes a heat request when its contact closes, while
it stops it when its contact opens. Though delivery temperature is automatically
calculated by the boiler, the user may manually override it. By modifying
HEATING on the user interface (C, Fig. 13.2), the HEATING SET POINT will
no longer be available but just a value that can be set from +5 to -5°C as
required. Modifications to this value do not directly change delivery tempera-
ture but affect the calculation made to automatically determine its value by
modifying the reference temperature of the system (0 = 20°C).
If a programmable timer is connected to the boiler, set parameter 51 =
1 (this parameter can only be modified from the remote control unit)
(Fig. 13.4)
When the contact is closed, the heat request is made by the delivery probe on
the basis of the external temperature in order to maintain the rated ambient
temperature at the DAY level (20 °C). When the contact opens, it does not
stop the heat request but reduces (parallel shift) the temperature curve to the
NIGHT level (16 °C).
This activates the night mode.
Though delivery temperature is automatically calculated by the boiler, the
user may manually override it.
By modifying HEATING on the user interface (C, fig. 13.2), the HEATING SET
POINT will no longer be available but just a value that can be set from +5 to
-5°C as required.
Modifications to this value do not directly change delivery temperature but
affect the calculation made to automatically determine its value by modifying
the reference temperature of the system (0 = 20°C for DAY level; 16°C for
NIGHT level).
14 - ADJUSTMENTS
The boiler has already been factory-adjusted by the manufacturer. If a new
adjustment is required, for example, after extraordinary maintenance, replacing
the gas valve or converting from natural gas to LPG, proceed as follows.
Maximum and minimum power, maximum heating and slow start must
be adjusted in the indicated sequence by qualified staff.
• Power the boiler.
• Turn the function selector to OFF/RESET (digit "--").
• Pull off the 3 function buttons (domestic hot water A, command B and
heating C, Fig. 13.2).
• Turn the trimmers in the following sequence and adjust them until their
values correspond with those indicated in the table:
1. Max (maximum fan rpm)
2. Min (minimum fan rpm)
3. Max heating (maximum heating fan rpm)
4. Slow start LA (set to 3.7=3700 rpm)
Calibration does not switch on the boiler.
When the trimmers are turned the value expressed in thousands (e.g..
2.5=2500 rpm) is indicated on the 2-digit display).
Slow start LA must be adjusted after calibrating all the other trimmers.
Maximum fan rpm
Natural gas
(G20)
28 C.S.I.
61
32 C.S.I.
59
36 C.S.I.
63
12 R.S.I.
51
15 R.S.I.
42
25 R.S.I.
55
35 R.S.I.
60
Minimum fan rpm
Natural gas
(G20)
28 C.S.I.
17
32 C.S.I.
15
36 C.S.I.
14
12 R.S.I.
12,9
15 R.S.I.
13
25 R.S.I.
17
35 R.S.I.
14
LPG
propane (G31)
61
rpm
59
rpm
63
rpm
51
rpm
41
rpm
54
rpm
60
rpm
LPG
propane (G31)
17
rpm
15
rpm
14
rpm
17
rpm
13
rpm
17
rpm
14
rpm
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