Trying to figure out putting a timer and thermostat on a gas system boiler. Opened up the boiler expecting to find the permanent feed and a connection for a switched live but found 2 empty connections. Why are there 2?
You were looking for two connections and you have found two connections. The pictograph says remove the link and connect the controls to 1 & 2. Do not take a separate live feed into either of those terminals.
Presumably one is a a live feed and the other is switched live, voltage unknown so don’t try connecting an external 230 volt supply, just follow the pictograph, remove the link and connect the controls.
Easy enough when you know what controls you’ll be fitting. If fitting a hive for example the hive would get a LNE supply. Then the common and 3 terminal on the hive would go to boiler 1&2. Terminal 1 and 2 is just voltage out then back in. But it’s not always 230v. That’s usually why volt free controls are used.
Give the hive a 230v supply from the spur or boiler. Then hive 1&3 to boiler 1&2. It can be done with 1 less wire as it’s 230v switching but just use 5.
The hive is a dual channel so there is no common. 1 on the hive is hw off. Does that make a difference?
So it’s a system boiler then with zone valves? Just noticed you mentioned that on your first post. If it’s a system with zone valves then the hive receiver replaces the programmer. What exact boiler do you have? If you’ve bought a dual channel programmer for a combi it can still be done.
With a system boiler the hive would usually connect with the zone valves not directly with the boiler. What programmer do you currently have?
Page 26 https://www.plumbase.co.uk/link/1/h029496_701_t.pdf The boiler switches at 230 volts, so the controls and wiring you install need to be rated at 230 volts and just to complicate things Baxi tells you to install a 2 amp fast blow fuse to protect them. You need to answer the question Mike83 asked, what programmer do you currently have?
It’s about 90% correct. The pump is incorporated into the boiler so ignore that. If fitting hive the room thermostat connections would also be missing. Heating on terminal 4 hive would link directly with the heating zone valve brown wire.