4
Alpha InTec² 20SE and 30SE
The boiler has a built in frost protection function to protect the boiler (only) from freezing. If water within the boiler falls below
4°C the boiler will fire in heating mode and raise the temperature of the heating water (in the boiler only) to 30°C.
For this function to be active the gas and electricity supplies to the boiler must be turned on and the boiler be in either
'Standby' or 'On' mode.
Further protection for the mains water supply and heating circuit must be provided separately.
If Alpha external controls are fitted, a frost protection setting is incorporated into the room thermostat activating the central
heating when the temperature falls below 5°C.
5 FROST PROTECTION
6 CONDENSATE DRAINAGE
High efficiency (condensing) boilers remove more useful heat from the combustion gases, resulting in additional water vapour
which is collected within the boiler (as condensate) and run to a suitable drainage point via the condensate drainage pipe.
If the condensate drain pipe runs outside it should be fitted with increased diameter pipe and be suitably lagged to reduce
the risk from freezing.
In situations where there are likely to be extremes of temperature or wind-chill the use of a proprietary trace-heating system
for external condensate drainage pipework, incorporating an external frost thermostat, should be considered.
4 FILL AND PRESSURISE THE SYSTEM
Do not attempt to fill or pressurise the system while the system is hot - wait for it to cool.
The filling loop will have two tap connections at either end of the filling loop. These taps should normally be in the closed
position 90° to the tap housing.
To fill or pressurise the system open one tap fully by turning it 90° anticlockwise in line with the tap housing. The second tap
should be opened a quarter of a turn and the water will start to refill the system (water should be heard filling the system).
You should see the pressure gauge (item 7 in Fig. 1) rise back up into the green area on the pressure gauge between 1 bar
and 1.5 bar pressure.
Once the pressure gauge is in the green area turn the taps back to the off position and the water will stop filling the system.
If you happen to fill the system too much and the pressure gauge is over the green area, just bleed water from a radiator until
the pressure on the gauge goes down into the green area.
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