Hi, I have had a Drayton 241 System installed for the last 15 years. Room Stat and Tank Stat controlling the boiler and pump.
Other than having to replace the pump twice in recent years all has been good with this until this last week.
I noticed the hot water was even hotter than normal, on investigating the thermostat was switching between calling for heat and not calling for heat but the 2 way valve was not closing fully to stop the flow when heat not needed. Last night I noticed that the hot water ran all night 24/7.
I removed the head of the valve and it was rattling, took it apart and discovered a spring was loose in the head, a plastic lug had fractured and so the valve was not springing back shut again. I fixed this by drilling a self tapper in and reattaching the spring. The valve then worked fine open and closed as does the heating valve. Both valves are responding to their thermostats but I seem to still have a problem and it has stumped me.
The pump and boiler are still running even with the valves shut and stats not calling for heat, They are even still running independently of the control programmer. I've not had this happen before. I took the programmer off the wall so there was no circuit and the pump and boiler still run independantly. With the valves shut the pump will be pumping against a dead end and the boiler firing means I will have a problem with pressure let alone wear and tear and waste of gas. Can anyone shed any light on this for me. In the wiring centre, with the programmer switched off wires 6 (HTG and HW Orange), 7 (HTG and Hot Water Grey), 11 (Boiler Live) and 12 (Pump Live) are all active at 240v.
Thanks in advance
Stephen
Other than having to replace the pump twice in recent years all has been good with this until this last week.
I noticed the hot water was even hotter than normal, on investigating the thermostat was switching between calling for heat and not calling for heat but the 2 way valve was not closing fully to stop the flow when heat not needed. Last night I noticed that the hot water ran all night 24/7.
I removed the head of the valve and it was rattling, took it apart and discovered a spring was loose in the head, a plastic lug had fractured and so the valve was not springing back shut again. I fixed this by drilling a self tapper in and reattaching the spring. The valve then worked fine open and closed as does the heating valve. Both valves are responding to their thermostats but I seem to still have a problem and it has stumped me.
The pump and boiler are still running even with the valves shut and stats not calling for heat, They are even still running independently of the control programmer. I've not had this happen before. I took the programmer off the wall so there was no circuit and the pump and boiler still run independantly. With the valves shut the pump will be pumping against a dead end and the boiler firing means I will have a problem with pressure let alone wear and tear and waste of gas. Can anyone shed any light on this for me. In the wiring centre, with the programmer switched off wires 6 (HTG and HW Orange), 7 (HTG and Hot Water Grey), 11 (Boiler Live) and 12 (Pump Live) are all active at 240v.
Thanks in advance
Stephen