AIC NESTA CHROME 150 Manual

heatingsystems
EN
Z-089870 • 00
NESTA CHROME 150 Gas Conversion Procedure
After gas conversion is performed,
control the gas pressure and consump-
tion at appliance start up, and perform
the adjustment procedures provided in
“Adjustment of Fan Speeds” on page
3and “Combustion Adjustment”
on page 4.
i
Summary
This procedure consists in replacing the fac-
tory-installed air-gas mixer for G20 natu-
ral gas attached to the fan, by an air-gas
mixer for G31 liqueed gas (Propane).
See Fig. 1 opposite for air-gas mixer location.
See table below for air-gas mixer top and bottom
injector sizes:
Air-gas mixer (Venturi)
Fig. 1. Air-Gas Mixer Location
Model
G31
Top - Bottom
N 150 WH 5.3 - 5.0
îMake sure that the gas type and pres-
sure of the distribution network are com-
patible with the appliance, as per the
information on the appliance data plate.
îIf the boiler was running before conversion,
allow it to cool down before carrying out any
task.
îConversion of the appliance from one
gas type to another can only be per-
formed by a qualied professional.
îGas conversion shall be performed
according to applicable local reg-
ulations. It is prohibited in some
countries. Perform conversion ac-
cording to the gas category spec-
ied for your country on the appli-
ance data plate.
îIf the boiler is intended to be used
with liqueed gas (propane), in-
stalling the boiler below ground
level can be hazardous and prohib-
ited in some countries. Please refer
to applicable local regulations for
installation requirements.
îIf the boiler is already installed before
conversion, the boiler must be turned
o, the power supply must be dis-
connected through the external fuse
or circuit breaker, and the gas supply
to the gas valve must be closed.

2Z-089870_EN • 00
Nesta Chrome 150 - Gas CoNversioN ProCedure
Air-Gas Mixer Replacement
Conditions:
îBoiler turned o using the appliance on/o switch
îPower supply deactivated through external electrical
box (fuse or circuit breaker)
îGas supply shut down
îBoiler cooled down
îFront and top panel removed. Please refer to the
Installation and Maintenance Manual for the correct
procedure.
Tools and material:
îWrench, hex head
îScrewdriver, at
îTorque wrench
Air-Gas Mixer Removal Procedure (Fig. 2)
1. Disconnect all connectors and grounding wires
from the fan and the gas valve.
2. Disconnect the air inlet duct (1) from the air-gas
mixer (6).
3. Release union (3) securing the gas valve and tube
(2) to the air-gas mixer (6).
4. Rotate the gas valve and tube (2) away from the
air-gas mixer assembly (6).
5. Release 3 screws and washers (5) securing the air-
gas mixer (6) to the fan (8).
6. Remove the air-gas mixer (6) and the hardware.
7. Retain hardware for reinstallation.
When removing the air-gas mixer, check the
general condition of the O-ring. Discard and
replace the O-ring if it is cracked or torn.
Air-Gas Mixer Installation Procedure (Fig. 2)
1. Install the new air-gas mixer (6) on fan using hard-
ware retained at removal. Check the O-ring (7)
condition and replace as required.
2. Rotate gas valve with pipe (2) on gas pipe back
towards the air-gas mixer (6)
3. Install gasket (4) and fasten the gas valve with pipe
(2) to the air-gas mixer (6) with union (3).
4. Connect the air inlet duct (1) to the air-gas mixer (6).
5. Reconnect all connectors and grounding wires to
the gas valve and fan.
Follow-on Task(s)
îOpen gas supply to the boiler.
îCheck the absence of leaks.
îPerform the fan speed adjustment. See “Adjustment of
Fan Speeds” on page 3.
i
6
5
7
2
4
3
1
8
Fig. 2. Removal and Installation of the Air-Gas Mixer

3
Z-089870_EN • 00
Nesta Chrome 150 - Gas CoNversioN ProCedure
N 150 WH
Fan speeds for G31
(Liqueed Gas)
Minimum rpm 1,400
Nominal rpm 7,480
Adjustment of Fan Speeds
Conditions:
îBoiler full of water and under pressure
îGas supply open
îPower supply activated through external electrical
box (fuse or circuit breaker)
Adjustment Procedure (Fig. 3)
1. Restart the boiler according to the procedure pro-
vided in the installation manual of the appliance.
2. Rotating the selector (1) and depressing it to con-
rm each selection:
îselect the icon,
îselect “Expert”,
îin “Select user level”; select “Engineer”, then
“Continue”
îselect the icon,
îselect “complete parameter list”,
îselect “Time of day and date” to access the list
of menus.
3. Rotating the selector (1), scroll to the bottom of the
list, “Burner Control”,
4. On page “(4/12)”, select “9524 Required speed LF”.
Press the selector (1) to modify the value. The value is
displayed in white on a black background (2).
5. Rotating the selector (1), adjust the minimum fan
speed according to the table shown at the bottom
of the page.
6. Press the selector (1) to conrm and save the value.
7. Rotating the selector, go up the screen, back to the
Burner Control page number. Select page number
“(4/12)” by pressing the selector (1), then go to the
following page.
8. On page “(5/12)”, select “9529 Required speed
HF”. Press the selector (1) to modify the value. The
value is displayed in white on a black background.
9. Rotating the selector (1), adjust the nominal fan
speed according to the table shown at the bottom
of the page.
10. Press the selector (1) to conrm and save the value.
11. Press the selector (1) for more than 3 sec. to exit
the setting menu.
Follow-on Task(s)
îPerform the combustion adjustment. See “Com-
bustion Adjustment” on page 4.
Fig. 3. Fan Speed Adjustment - Typical Screen
27.01.2020 16:42
2
Burner control 4/12
9518 Safety me
9519 Safety me with ignion
9524 Required speed LF
3.0s
1400rpm
3.6s
Back
1
2

4
Nesta Chrome 150 - Gas CoNversioN ProCedure
www.myaic.eu
AIC Europe B.V.
Graafschap Hornelaan 163A
NL-6001 AC Weert
Combustion Adjustment
Conditions:
îBoiler full of water and under pressure
îGas supply activated
îPower supply activated through external electrical
box (fuse or circuit breaker)
îBoiler turned on using the On/O switch
Tools and material:
îFlue gas analyser
îScrewdriver, at head, size 3
îWrench, hex head, sizes 2 and 2.5
Adjustment Procedure (Figs. 4 & 5):
1. Activate the required heating mode.
2. Allow the boiler to operate for a few minutes.
3. Connect the ue gas analyser probe to the meas-
uring port of the ue gas pipe.
4. Check CO2 contents in the ue gas at max. output
as follows:
îUsing the rotary selector (1), select and acti-
vate the icon,
îSelect “Special operations (1/3)”,
îSet “Chimney sweep function” to “On”,
îSet “Burner output” to “Full load”.
5. Check the CO2 (or O2) contents displayed on the
gas analyser, and compare the values with those in
the table below.
- Rotate throttle screw clockwise (to the right)
to decrease the CO2 contents.
- Rotate throttle screw counter-clockwise (to
the left) to increase the CO2 contents.
7. Check CO2 contents in the ue gas at min. output
as follows:
îSet “Burner output” to “Partial load”.
îCheck the CO2contents, and compare the
values with those in the table at the bottom
of the page.
îIf the value is outside the range, adjust the
combustion value by turning the oset screw
(3) in small steps to allow the value to stabilise
before performing additional adjustments.
The oset screw (3) is factory-sealed.
After adjustment, make sure to reseal it.
8. Once measurement is complete, in “Special opera-
tions (1/3)”, set “Chimney sweep function” to “off”.
9. Press the selector (1) for more than 3 sec. to exit
the setting menu.
10. Restart the boiler to check the ignition behaviour.
Control the correct operation of the boiler by re-
peating steps 1 to 7.
11. Reseal the oset screw (3) using some paint or tape.
Follow-on Task(s):
îOn the gas valve (Fig. 5), place the yellow sticker in-
dicating that a gas conversion has been carried out.
îOn the data plate (below the boiler), place the white stick-
er indicating that a gas conversion has been carried out.
îReinstall front and top panels, Please refer to the ap-
pliance Installation and Maintenance manual for the
correct procedure.
îRecord the combustion values in the log sheet available
in the installation manual of the appliance.
i
@Min output @Max output
G31 %CO210.0 (±0.2) 10.7 (+0;-0.2%)
G31 %O25.7 (±0.3) 4.6 (+0;-0.3%)
Fig. 4. Combustion Adjustment - Control Panel
2
3
Fig. 5. Combustion Adjustment on Gas Valve
G31
Sticker
27.01.2020 14:42
Special operaons (1/3)
Chimney sweep funcon
On
Back
1
6. If the value is outside the range, adjust the com-
bustion value by turning the gas valve throttle (2) in
small steps, to allow the value to stabilise before
performing additional adjustments.