Sunvic Motorised Valv Actuator Replacement DM5601/SD2701

[Neil Allen]

Hi,

I had problem where my central heating was tripping the circuit breaker on my house. A heating engineer and electrician resolved by replacing the timer and actuator. The original actuator was a Sunvic DM5601 and had 5 wires. The replacement is a Sunvic SD2701 with only 4 wires. Since then we've had an issue where the heating doesn't switch off with thermostat. With my trusty multimeter I've proven that signal is reaching the actuator and it has power. The actuator was not turning. Today, working with the heating engineer, I discovered that the temperature switch was set to 130C! This most likely happened during fault finding of the original issue. Turned it back down to 60C and problem resolved! Actuator started turning! A few hours later and the timer kicked in and the heat came on. Actuator no longer turning

What I'd really like to know is whether the SD2701 is a suitable replacement for the DM5601? It does have 1 less wire. Could this be the cause of the issue I'm seeing?

Any advice greatly appreciated!

 

[Sharp Point]

Hello, does this help?

Motorised Zone Valves

Look at the bottom in the questions, Neil.

 

[Neil Allen]

Looks like it's not suitable! Thanks so much for the response. I did have a look at their website but missed the questions.

Thanks again

 

[stevetheplumber]

i suspect the first one was motor open motor close and the new one is sprung return i should be possible to alter the wiring but probably easier to get the correct head

 

[Neil Allen]

Thanks Steve. That's certainly what the Sunvic site seems to say. Agree that getting the correct head is probably the easiest fix. Thanks for replying