22
www.ehs-heating.com
7.7.
Set Pump Speed & Purge Air
The Boiler should still be in standby mode.
7.7.1.
Please check the following before proceeding.
7.7.1.1.
The boiler parameters have been set as above.
7.7.1.2.
The air vent on the pump is open (dust cap is moving freely).
7.7.1.3.
Set the pump to speed 1.
The boiler can now be activated
7.7.2.
Turn On the Boiler –
Press and hold the power button until the boiler bleeps and exits standby mode. The front panel
should be showing a flashing thermostat symbol (if you have set your thermostat to off or its’ lowest
setting) and signals that the thermostat is not demanding any heating.
7.7.3.
Set The Thermostat –
Turn the thermostat on and set to a temperature that would require heat. The thermostat symbol
should be solidly lit. The pump will start and a few seconds later the ignition symbol will appear lit
showing that the boiler has started to heat the water.
7.7.4.
Purge Air from The System –
With the pump running start to purge all air from the system by bleeding all radiators and air vents.
Once bled the system should run with very little noise coming from the boiler or pump.
7.7.5.
Set Pump Speed –
Set this by adjusting the pump speed to achieve a 15 ~ 20°C differential between the flow and return
temperatures.
7.7.6.
Set Automatic Bypass Valve –
Set all TRV’s to the open position (i.e.max temp). Now set the ABV to ‘just closed’. To confirm this is
correctly set, close one of the TRV’s and that should allow a small amount of flow past the ABV.
7.7.7.
Check System Pressure and Top Up As Required –
Don’t forget to disconnect the filling loop and ensure that all connections are capped to avoid leaks.
7.8.
Set Domestic Hot Water (DHW) Flow &
Temperature
In order to get hot water from the combination boiler at the required temperature you must set the flow rate of
the cold water coming into the boiler. This can be achieved by restricting the isolation valve on the cold inlet to
