31
EN
cod. 3540S420 - 05/2010 (Rev. 00)
3.6 Connection to the flue
The flue connection pipe diameter must not be less than that of the connection on the
anti-backflow device. Starting from the anti-backflow device it must have a vertical sec-
tion at least 50 cm long. Comply with the current standards regarding installation and siz-
es of the flues and connection pipe.
4. SERVICE AND MAINTENANCE
4.1 Adjustments
All adjustment and conversion operations must be carried out by Qualified Personnel.
The Manufacturer declines any liability for damage or injury caused by unqualified and
unauthorised people tampering with the unit.
Heating system output adjustment
This operation is carried out with the boiler working.
Connect a manometer to he pressure point
2
(fig. 4) located downstream of the gas
valve, and turn the boiler thermostat knob (ref. 5 - fig. 1) to the maximum value.
After removing the protection cap
5
(fig. 4), adjust the gas pressure at the burner by turn-
ing the screw
6
to the required value (see technical data table and output variability dia-
grams given in cap. 5).
Then turn the burner on and off 2 or 3 times by means of the control thermostat and
check that the pressure value is that just set; otherwise, another adjustment must be
made to bring the pressure to the correct value.
Gas conversion
The unit can operate on natural gas (G20-G25) or liquefied gas (G30-G31) and is facto-
ry-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,
the special conversion kit will be required, proceeding as follows:
1.
Replace the nozzles at the main burner and pilot burner, fitting the nozzles specified
in the technical data table in cap. 5, according to the type of gas used
2.
Remove the small protection cap
3
(fig. 4) from the gas valve. Using a small screw-
driver, adjust the ignition step for the required gas (
G20-G25
position
D
fig. 4 or
G30-
G31
position
E
fig. 4); then refit the cap.
3.
Adjust the gas pressure at the burner, 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.
fig. 4 - Pressure adjustment
A
Gas valve
B
Decrease pressure
C
Increase pressure
D
Ignition step adjustment for
G20-G25 NATURAL
gas
E
Ignition step adjustment for
G30-G31 LIQUEFIED
gas
F
Electronic controller
1
Pressure point upstream
2
Pressure point downstream
3
Protection cap
4
Ignition step regulator
5
Protection cap
6
Pressure adjustment screw
7
Alarm LED
8
RESET button
4.2 Start-up
B
System start-up must be carried out by Qualified Personnel. Checks to be
made at first lighting, and after all maintenance operations that involved discon-
necting from the systems or work on safety devices or parts of the boiler:
Before lighting the boiler:
•
Open any on-off valves between the boiler and the system.
•
Check the tightness of the gas system, proceeding with caution and using a soap
and water solution to detect any leaks in connections.
•
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 or boiler.
•
Check the correct connection of the electrical system.
•
Make sure the unit is connected to an efficient earthing system.
•
Make sure the pressure and gas flow values are those required for heating.
•
Make sure there are no flammable liquids or materials in the immediate vicinity of
the boiler
Lighting the boiler
•
Open the gas cock ahead of the boiler.
•
Vent the air from the pipe ahead of the gas valve.
•
Turn on the switch or insert the plug (if present) ahead of the boiler
•
Turn the boiler switch (ref. 6 - fig. 1) to position 1.
•
Turn the knob 5 (fig. 1) to a value above 50°C and that of the room thermostat (if
present) to the required temperature value. The burner will light and the boiler be-
gins to function automatically, controlled by its adjustment and safety devices.
B
If the burners do not light and the pushbutton indicator comes on after correctly
carrying out the lighting procedure, wait about 15 seconds and then press the
above pushbutton. The reset controller will repeat the lighting cycle. If the burn-
ers do not light after the second attempt, refer to par. 3.4 “Troubleshooting”.
The boiler switch 6 has 3 positions “0-1-TEST”; the first two have the on-off
function, the third (unstable) must only be used for service and maintenance
purposes (see wiring diagrams).
A
In case of a power failure while the boiler is working, the burners will go out and
relight automatically when the power is restored.
Checks during operation
•
Make sure the fuel circuit and water systems are tight.
•
Check the efficiency of the flue and fume ducts while the boiler is working.
•
Make sure the water is circulating properly between the boiler and the system.
•
Check correct lighting of the boiler, by turning it on and off several times using the
room thermostat or boiler thermostat.
•
Make sure the fuel consumption indicated on the meter matches that given in the
technical data table in cap. 5.
Turning off
To temporarily turn the boiler off, just the turn main switch 6 (fig. 1) to 0.
To shut down the boiler for prolonged periods:
•
Turn knob of the main switch 6 (fig. 1) to 0;
•
Close the gas cock ahead of the boiler;
•
Disconnect the power to the unit;
B
To avoid damage caused by freezing during long idle periods in winter, it is ad-
visable to drain all water from the boiler and system; or add a suitable antifreeze
to the heating system.
4.3 Maintenance
B
The following operations must only be carried out by Qualified Personnel.
Seasonal inspection of the boiler and flue
It is advisable to carry out the following checks at least once a year:
•
The control and safety devices (gas valve, thermostats, etc.) must function correctly.
•
The fume ducts must be free of obstructions and leaks.
•
The gas and water systems must be tight.
•
The burner and boiler shell must be clean. Follow the instructions in the next section.
•
The electrodes must be free of deposits and properly positioned (see fig. 10).
•
The water pressure in the system when cold must be approx. 1 bar; otherwise bring
it to that value.
•
The expansion tank, if present, must be filled.
•
The gas delivery and pressure must correspond to that given in the technical data
table (see cap. 5).
•
The circulating pumps must not be blocked.
Safety devices
The boiler
PEGASUS 56
is equipped with devices that guarantee safety in case of oper-
ation faults.
Automatic reset temperature limiter (safety thermostat)
This device prevents the water temperature in the system from exceeding boiling point.
The maximum activation temperature is 110°C.
Automatic reset of the temperature limiter can only occur with cooling of the boiler (the
temperature must drop by at least 10°C) and identification and subsequent elimination
of the problem that caused the shutdown. The safety thermostat (detail 7 of fig. 1) is lo-
cated inside the control panel.
Fume sensor (fume thermostat) safety device
The boiler is equipped with a fume evacuation control device (fume sensor - ref. 3 of
fig. 1) In case of anomalies in the fume exhaust system with return of burnt gases in the
room, the unit shuts down. The hood is equipped with a temperature sensor bulb for
measuring and controlling the fume temperature.
Any leaks of burnt gases into the room cause an increase in the temperature detected
by the bulb, which causes the boiler to turn off within 2 minutes, shutting off the gas to
the burner. If the fume sensor cuts in, unscrew the protection cover (ref. 3 of fig. 1) locat-
ed on the control panel and manually reset the device. The boiler will resume operation.
If the sensor has to be replaced due to a fault, only use original accessories and make
sure the electrical connections and bulb positioning are correctly carried out.
B
The fume sensor must not be excluded for any reason!
Summary of Contents for GASTER N 56 AW
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