HI
I have installed evohome this weekend and on the whole it has gone to plan. I have an Vaillant ecotec pro 28 combi boiler. I have two zones of heating ( Zone 1- Radiators, external stat , Zone 2- Single zone UFH- using the controllers internal sensor). These zones are currently controlled by zone valves ( i do plan on installing evohome TRVs for zone 2 but cant afford that at the moment). The boiler is controlled by opentherm.
At the moment the boiler is receiving a request for heat (54 degrees) the zone valve for Zone 2 opens correctly. (zone 1 is turned off at the controller) After a few minutes the zone valve closes but there is still a request for heat. The ABV kicks in and the boiler turns it self off as it is now at temperature, yet it is still receiving a request for a heat. After this the boiler can get through its anti cycling time, and then fire back up with the zone valve still shut. The controller then increase the boiler temperature to maximum.
I have a potential fix. The boiler has a link (between 3 and 4). This is required for the boiler to fire with the opentherm. Instead of the link i can connect these through the zone valves meaning that the boiler will only fire if the zone valves are open. My concern is that if the controller is requesting heat yet the boiler is unable to respond am I limiting/hampering the system.
Is there a better way i can set this up (without spending the money on 12 TRVs) or have i missed something in the setup/settings which will fix my issue.
If it is all right with my set up will my potential fix cause any issues.
Many thanks
Mat
I have installed evohome this weekend and on the whole it has gone to plan. I have an Vaillant ecotec pro 28 combi boiler. I have two zones of heating ( Zone 1- Radiators, external stat , Zone 2- Single zone UFH- using the controllers internal sensor). These zones are currently controlled by zone valves ( i do plan on installing evohome TRVs for zone 2 but cant afford that at the moment). The boiler is controlled by opentherm.
At the moment the boiler is receiving a request for heat (54 degrees) the zone valve for Zone 2 opens correctly. (zone 1 is turned off at the controller) After a few minutes the zone valve closes but there is still a request for heat. The ABV kicks in and the boiler turns it self off as it is now at temperature, yet it is still receiving a request for a heat. After this the boiler can get through its anti cycling time, and then fire back up with the zone valve still shut. The controller then increase the boiler temperature to maximum.
I have a potential fix. The boiler has a link (between 3 and 4). This is required for the boiler to fire with the opentherm. Instead of the link i can connect these through the zone valves meaning that the boiler will only fire if the zone valves are open. My concern is that if the controller is requesting heat yet the boiler is unable to respond am I limiting/hampering the system.
Is there a better way i can set this up (without spending the money on 12 TRVs) or have i missed something in the setup/settings which will fix my issue.
If it is all right with my set up will my potential fix cause any issues.
Many thanks
Mat
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