Boiler electrical connection

Discussion in 'Electricians' Talk' started by Simonson82, Sep 30, 2022.

  1. Simonson82

    Simonson82 Member

    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?
    20220930_124014.jpg
     
  2. The Happy Builder

    The Happy Builder Screwfix Select

    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.
     
    Cliff Rees likes this.
  3. Simonson82

    Simonson82 Member

    I was only expecting 1 other connection apart from the permanent feed. There's 2 (1 and 2)
     
  4. The Happy Builder

    The Happy Builder Screwfix Select

    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.
     
    Cliff Rees likes this.
  5. Mike83

    Mike83 Screwfix Select

    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.
     
  6. Simonson82

    Simonson82 Member

    It is a hive controller and it is 230v switching
     
  7. Mike83

    Mike83 Screwfix Select

    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.
     
  8. Simonson82

    Simonson82 Member

    The hive is a dual channel so there is no common. 1 on the hive is hw off. Does that make a difference?
     
  9. Mike83

    Mike83 Screwfix Select

    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.
     
  10. Simonson82

    Simonson82 Member

    It's a baxi megaflow compact ga
     
  11. Mike83

    Mike83 Screwfix Select

    With a system boiler the hive would usually connect with the zone valves not directly with the boiler.
    What programmer do you currently have?
     
  12. The Happy Builder

    The Happy Builder Screwfix Select

    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?
     
  13. Simonson82

    Simonson82 Member

    There's no timer at all. It was never fitted with one. It's simply on/off atthe switch.
    Screenshot_20221001-101636_Chrome.jpg
     
  14. Simonson82

    Simonson82 Member

    Is this the wiring diagram I need?
     
  15. Mike83

    Mike83 Screwfix Select

    Do you have zone valves, room thermostat and a cylinder thermostat?
     
  16. Mike83

    Mike83 Screwfix Select

    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.
     
  17. Simonson82

    Simonson82 Member

    Nope. It's a blank canvas
     
  18. Mike83

    Mike83 Screwfix Select

    So you turn the boiler on at the switch and it heats the radiators and hot water?
     
  19. The Happy Builder

    The Happy Builder Screwfix Select

    Is there a time clock in the front of the boiler case?
     
  20. The Happy Builder

    The Happy Builder Screwfix Select

    Does it heat the central heating radiators and a hot water cylinder?
     

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