Immergas NIKE MYTHOS 24 2 E, Instruction And Warning Book

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15
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3.4 CONVERTING THE BOILER TO
OTHER TYPES OF GAS.
If the boiler has to be converted to a different gas
type to that specified on the data plate, request
the relative conversion kit for quick and easy
conversion.
The gas conversion operation must be carried
out by an authorised company (e.g. Immergas
After-Sales Technical Assistance Service).
To convert to another type of gas the following
operations are required:
- disconnect the appliance;
- replace the main burner injectors, making sure
to insert the special seal rings supplied in the
kit, between the gas manifold and the injectors;
- re-power the appliance;
- select, using the boiler key, the gas parameter
type (P1) and select ( nG ) in the case of methane
supply or (
LG
) in the case of LPG supply;
- adjust the boiler nominal heat output;
- adjust the boiler nominal heat output in
domestic hot water phase;
- adjust the boiler nominal heat output in heating
phase;
- adjust (eventually) the maximum heating
power;
- seal the gas flow rate regulation devices (if
settings are modified);
- after completing the conversion, apply the
sticker, contained in the conversion kit, near
the data-plate. Using an indelible marker pen,
cancel the data relative to the old type of gas.
These adjustments must be made with reference
to the type of gas used, following that given in
the table (Par. 3.16).
3.5 CHECKS FOLLOWING
CONVERSION TO ANOTHER TYPE
OF GAS.
After making sure that conversion was carried
out with a nozzle of suitable diameter for the
type of gas used and the settings are made at the
correct pressure, check that:
- there is no flame in the combustion chamber;
- the burner flame is not too high or low and that
it is stable (does not detach from burner);
- the pressure testers used for calibration are
perfectly closed and there are no leaks from
the gas circuit.
N.B.:
all boiler adjustment operations must
be carried out by an authorised company (e.g.
Immergas After-Sales Assistance). Burner
adjustment must be carried out using a
differential "U" or digital type pressure gauge
connected to the gas valve outlet pressure point
(part. 4 Fig. 3-3), keeping to the pressure value
given in the table (Par. 3.16) according to the type
of gas for which the boiler is prepared.
3.6 POSSIBLE ADJUSTMENTS.
• Adjustment of boiler nominal thermal heat
output.
- Press the domestic hot water adjustment button
(+) (3 Fig. 2-1) up to the maximum operating
temperature.
- Open the domestic hot water cock in order to
prevent modulation intervention.
- With the brass nut (3 Fig. 3-3) adjust the boiler
nominal output, observing the maximum
pressure values stated in the tables (Par. 3.16)
depending on the type of gas.
- By turning in a clockwise direction the heating
potential increases and in an anti-clockwise
direction it decreases.
• Adjust the boiler minimum heat output in the
domestic hot water phase (Fig. 3-3).
N.B.: only proceed after having calibrated the
nominal pressure.
Adjustment of the minimum thermal input
is obtained by operating on the cross plastic
screws (2) on the gas valve maintaining the
brass nut blocked (3);
- disconnect the power supply to the modulating
coil (just disconnect a faston); by turning
the screw clockwise, the pressure increases,
anti-clockwise it decreases. On completion of
calibration, re-apply the power supply to the
modulating coil. The pressure to which the
boiler minimum power must be adjusted, must
not be lower than that stated in the tables (Par.
3.16) depending on the type of gas.
N.B.: to adjust the gas valve, remove the plastic
cap (6); after adjusting, refit the cap.
3.7 PROGRAMMING THE P.C.B.
The boiler is prepared for possible programming of
several operation parameters. By modifying these
parameters as described below, the boiler can be
adapted according to specific needs.
To access the programming phase, proceed as
follows (references Fig. 2-1):
- press buttons (1) and (2) for 15 about seconds
until the programming mode is accessed on
the display;
- using buttons (3) and (4), select the parameter
to be changed indicated in the following table:
List of
param-
eters
Description
P1 Gas type selection
P2
Special gas G110 selection (Not
used on this model)
P3
Fixed or correlated domestic
hot water set-point
P5 Minimum CH output
P6 Maximum CH output
P7 Central heating ignitions timer
P8 Central heating ramp timer
P9
Boiler type (monothermal -
bithermal)
- adjust the corresponding value consulting the
table using keys (5) and (6);
- confirm the set value pressing the reset key
(1) for approximately 5 seconds; pressing keys
(3) + and (4) - at the same time to adjust the
domestic hot water temperature, the operation
is cancelled.
N.B.: after a period of time, without touching
any keys, the operation cancels automatically.
Gas type selection. The setting of this function
is used to adjust the boiler in order to function
with LPG gas or Methane gas.
Gas type selection
Range of values which can
be set
Parameter
LG
(LPG) o
nG
(Methane) P1
Gas G110 - Industrial gas (Not used on this
model). The setting of this function is used to
adjust the boiler in order to function with gases
from the first family.
Gas G110 - Industrial gas (first family gas)
Range of values which can
be set
Parameter
on - off (Standard setting) P2
Fixed or correlated domestic hot water set-
point.
By setting the parameter P3 in
on
mode,
burner disabling is correlated to the adjustment
of the domestic hot water temperature. In
OFF
mode, the burner is switched off at maximum
value.
Fixed or correlated domestic hot water
set-point
Range of values which can
be set
Parameter
on
correlated -
off
fixed (Stand-
ard settings)
P3