+ Q: The power, pump, valve and boiler lights are coming on, but the system is still not heating up. What is the issue?
A: There has been a fault with some UB10s where the switching does not occur, so everything can be wired in correctly but still does not turn the system on. This would require a replacement.
+ Q: What is the red wire on the valve terminals linking between the Or (Orange) and Gr (Grey)?
A: This is a link wire. It should stay on the board if you are not using a local zone valve, such as if it is being controlled by the heat source. If you have a local zone valve, this link can be removed, and the Or and Gr from the valve should be wired in.
+ Q: Do I need the wiring centre to be wired into the boiler?
A: Yes. This is to let the boiler know when the UFH requires hot water.
+ Q: Which terminals should the boiler be wired into?
A: The live from the boiler should run to the COM terminal, and the switched live should run back out of the NO.
+ Q: Can I use a wireless relay to link to the boiler?
A:Yes. This would be possible, but untested currently.
+ Q: Which type of electrical cable should be used to connect the wiring centre to the boiler and/or thermostats?
A:Typical 1.5mm 3 core + Earth lighting cable should be used, as Live, Switched Live, Neutral, and Earth will all be wired in.
+ Q: Is the UB10 compatible with digital protocols such as OpenTherm or EMS on boilers?
A:No. The wiring centre is an analogue on/off system, and would not be able to communicate with a digital signal directly. There are workarounds using gateways and then an OpenTherm or EMS thermostat, but the wiring centre would only control the boiler on/off switch.
+ Q: Why is there a delay switch of 1 or 3 minutes?
A:This gives the valve actuators time to fully open so that the pump is not working against closed valves, and the boiler firing with no circulation.
+ Q: What size fuse is in the wiring centre?
A:The fuse is a 250V 15A 30mm anti-surge fuse.
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