Radiant RCM Installation, Use And Maintenance Manual - page 18
Installation Manual
Wall Hung Boiler – Cod. 99817NA – July 2001
13
• check the pressure in the system: if this has gone down and LED 16 (see fig. 2) comes
on (pressure gauge shows 1.5 bar) restore pressure;
• close the filling tap once this operation is completed;
Filling the system (only for U.K. and Ireland)
After making sure the gas cock is closed, fill the heating system as follows;
• fill the system until a pressure of 1.5 bar has been reached (light no. 16 ON; see fig. 2
pag. 12) and then close the tap on the filling loop;
• make sure the cap on the auto air vent valve is slightly loose to allow air to escape from
the system (see fig. 1);
• undo the cap on the circulation pump to eliminate any eventual air locks (see fig. 1).
Undo the valve on the heat exchanger and then close it again as soon as water appears
(see fig. 2); it is a good idea to purge all radiators of air at this point too;
• before starting up the boiler the water pressure must be checked again; if this is seen to
be below 0.5 bar (light no. 14 flashes; see fig. 2 pag. 12), bring it back up to 1.5 bar (light
no. 16 ON; see fig. 2 pag. 12) and close the tap on the filling loop
• switch on the electrical power supply to the boiler;
• turn selector switch 1 to the WINTER !
!
!
!
position (see fig. 1 pag. 12), after a few seconds
the pump will come into action;
• once the boiler is working, if any noises are heard in the system, repeat the above air
purging procedures until there is no air left in the system;
• turn on a hot water tap briefly;
• if any noises are heard, loosen the valve on the heat exchanger (see fig.2) and close it
again as soon as water appears;
• check there are no obstructions in the exhaust duct;
• check the pressure in the system: if this has gone down and LED 16 (see fig. 2 pag. 12)
comes on (pressure gauge shows 1.5 bar) restore pressure;
• close the tap on the filling loop once this operation is completed;
Starting up the boiler
• open the gas cock;
• turn on the boiler;
• set selector switch 1 to either the "
"
"
"
summer or !
!
!
!
winter symbols (see fig.1 pag. 12); make sure that no. 6 light is ON (see fig. 2
pag. 12). The automatic ignition system will turn the burner on. It may be necessary to repeat the procedure a few times to purge
air from the pipes. To repeat the ignition procedure press release button 2 (see fig.1 pag. 12) and then try the ignition procedure
once again. If the boiler does not start, press the reset button 2 (see fig. 1 pag. 12). IMPORTANT should the boiler fail to ignite
wait 3 minutes before pressing button again.
• turn selector switch 1 to the «off» position (see fig. 1 pag. 12), insert a gauge into the pressure point (see fig. 4 pag. 15; pos. no. 4),
turn on the boiler and check the minimum and maximum calibration pressures of the modulator in accordance with those stated on
the gas plate; (to check the maximum modulation pressure of the modulator, turn on a hot water tap and check that the maximum
pressure is equal to that stated on the plate; to check the minimum, undo one wire from the modulator coil and check on the gauge
that the minimum pressure is equal to that stated on the plate; if the maximum pressure is not the same as stated on the plate,
calibrate the modulator again;
• once the calibration procedure has been completed, unplug the mains lead or turn off the mains switch, close the gas cock and
remove the gauge from the pressure point; tighten the screw making sure there are no gas leaks;
• after carrying out this operation, return the panel to its correct position and put the front casing back.
CHECK the maximum heating power.
For procedure regarding regulation of the heating system thermal capacity see «BOILER ADJUSTMENTS» on pag. 14.
EMPTYING THE CENTRAL HEATING SYSTEM
Whenever it is necessary to empty the system, proceed as follows:
• turn off the main power supply switch;
• wait for the boiler to cool down;
turn the system drain tap RS (see fig. 4) and use a container to collect the water that runs out;
EMPTYING THE DOMESTIC HOT WATER SYSTEM
Whenever there is danger of freezing, the hot water system should be emptied in the following way:
• shut off the water at the mains;
• open all hot and cold water taps;
•
empty from the lowest point (where possible).
AIR VENT VALVE
AIR VENT VALVE CAP
CIRCULATING PUMP
VALVE
EXCHANGER
D.H.W.
EXCHANGER
RS
PUMP CAP
Fig. 1
Fig. 2
Fig. 3
Fig. 4