33
AIR BLEEDING FROM BOILER AND WATER HEATER
During the water heater system filling particular attention must be payed to the air bleeding.
Operate as follows:
- Make sure that the manual and automatic air bleed valves are open
- Make sure that the main switch is off
- Fill by turning the loading tap and making water flow in very slowly
- Close the manual valves as they start pouring water in a sequence
- When the manometer shows the desired pressure (0.3 0.5 bar above the plant hydrostatic pressure), close
the loading tap.
- Ignite the boiler to Summer position and let the hot water circulator operate for some minutes
- Stop the circulator, turning the main switch, and make sure that only water flows from the manual air bleed
valves. If air is released, repeat the operation
- Check the pressure on the manometer again
FIRST BOILER IGNITION AND ADJUSTMENT
Remove the pressure intake screw on the gas valve and fix a water column manometer. Open the gas tap.
Check that the upstream gas pressure is equal to or slightly more than the values required in the technical data
table (page 26).
Warning:
if the pressure is more than what indicated in the table, insert pressure reducers upstream of the
boiler or of the boiler room, or contact the gas provider company:
-
Connect the plug or start the switch upstream of the boiler. The voltage presence pilot lamp lights up. If the
voltage presence pilot lamp does not light up:
1) Check the presence of voltage supply
2) Check the boiler connection to the supply mains
-
Turn the main switch on
Set the desired temperatures on the adjustment thermostat (and on the priority thermostat). Adjust the hot
water adjustment thermostat. Check that the fan pilot lamp lights up. If not:
1) check the fan rotation
2) if the fan is rotating, check that the pilot lamp has not burnt, or that the pressure switch performs the
switching and that the suction diaphragm is present
3) if the fan is not rotating, check the presence of voltage supply
ERA 31 BS 60
53
3,4
BOILER TYPE
Loses
of power
Ø
diaphragm
Max.
Lenght
mm
20
m
mmH
2
O
2,3
Loses
of power
Max.
Lenght
3
m
mmH
2
O
DOUBLE FLUE PIPE
CONCENTRIC FLUE PIPE
The diaphragm on the air intake hole must be removed in case of separate discharges, when the piping length
is more than 9 metres.
The air intake hole closing plug and seal gasket must be always mounted when the fume evacuation system has
a concentric discharge.
