Service And Maintenance - Ferroli DOMIcondens F 28 Instructions For Use, Installation And Maintenance

4. SERVICE AND MAINTENANCE

4.1 Adjustments
Gas conversion
The unit can operate on natural gas or LPG and is factory-set for use with one of these
two gases, as clearly shown on the packing and on the dataplate. Whenever a different
gas to that for which the unit is preset has to be used, a conversion kit will be required,
proceeding as follows:
1. Replace the nozzles at the main burner, fitting the nozzles specified in the technical
data table in cap. 5, according to the type of gas used
2. Modify the parameter for the type of gas:
• put the boiler in standby mode
• press the reset button (detail 6 - fig. 1) for 10 seconds: the display shows "TS"
flashing
• press the reset button (detail 6 - fig. 1): the display shows "P01".
• Press the DHW buttons (detail 1 - fig. 1) to set parameter 00 (for operation with
natural gas) or 01 (for operation with LPG).
• Press the reset button (detail 6 - fig. 1) for 10 seconds.
• the boiler will return to standby mode
3. Adjust the minimum and maximum pressures at the burner (ref. relevant section),
setting the values given in the technical data table for the type of gas used
4. Apply the sticker contained in the conversion kit, near the dataplate as proof of the
conversion.
TEST mode activation
Press the heating buttons (detail 3 - fig. 1) at the same time for 5 seconds to activate the
TEST mode. The boiler lights at the maximum heating power set as described in the fol-
lowing section.
The heating and DHW symbols (fig. 17) flash on the display; the heating power will be
displayed alongside.
fig. 17 - TEST mode (heating power = 100%)
To deactivate the TEST mode, repeat the activation sequence.
The TEST mode is automatically disabled in any case after 15 minutes.
Adjustment of pressure at burner
Since this unit has flame modulation, there are two fixed pressure values: the minimum
and maximum, which must be those given in the technical data table according to the
type of gas.
• Connect a suitable pressure gauge to pressure point "B" downstream of the gas
valve.
• Disconnect the pressure compensation tube "N".
• Remove the protection cap "D".
• Operate the boiler in TEST mode.
• Adjust the maximum pressure by turning the screw "G" clockwise to increase the
pressure and anticlockwise to decrease it.
• Disconnect one of the two fastons "C" from the modureg "F" on the gas valve.
• Adjust the minimum pressure by turning the screw "E" clockwise to increase the
pressure and anticlockwise to decrease it.
• Turn the burner on and off, checking that the minimum pressure remains stable.
• Reconnect the faston "C" detached from the modureg "F" on the gas valve
• Check that the maximum pressure has not changed
• Reconnect the pressure compensation tube "N".
• Refit the protection cap "D".
• To end the TEST mode, repeat the activation sequence or wait 15 minutes.
After checking or adjusting the pressure, make sure to seal the adjust-
A
ment screw with paint or a specific seal.
6
EN
cod. 3540S920 - 05/2009 (Rev. 00)
Supplied By www.heating spares.co Tel. 0161 620 6677
DOMIcondens F 28
H F I
R
B A
L
N
fig. 18 - Gas valve
A Upstream pressure point
B Downstream pressure point
C Modureg electrical connection
D Protection cap
E Minimum pressure adjustment
F Modureg
G Minimum pressure adjustment
H Compensation tube connection
I Gas valve electrical connection
L Sealed chamber
M Pressure gauge
N Compensation tube
R Gas outlet
S Gas inlet
Heating power adjustment
To adjust the heating power, switch the boiler to TEST mode (see sec. 4.1). Press the
heating buttons detail 3 - fig. 1 to increase or decrease the power (min. = 00 - max. =
100). Press the reset button within 5 seconds and the max. power will remain that just
set. Exit TEST mode (see sec. 4.1).
Lighting power adjustment
To adjust the lighting power, switch the boiler to TEST mode (see sec. 4.1). Press the
DHW buttons (detail 1 - fig. 1) to increase or decrease the power (min. = 00 - max. = 60).
Press the reset button within 5 seconds and the lighting power will remain that just
set. Exit TEST mode (see sec. 4.1).
4.2 Startup
Before lighting the boiler
• Check the seal of the gas system.
• Check correct prefilling of the expansion tank.
• Fill the water system and make sure all air contained in the boiler and the system
has been vented.
• Make sure there are no water leaks in the system, DHW circuits, connections or boil-
er.
• Check correct connection of the electrical system and efficiency of the earthing sys-
tem.
• Make sure the gas pressure for heating is that required.
• Make sure there are no flammable liquids or materials in the immediate vicinity of
the boiler
D
E
G
S
C
F
+
M
B