Bit of help needed testing of central heating system

[sg spark]

Hi guys
im normally ok with testing but not too sure when it comes to central heating systems.
When testing water heater do i disconnect heater element first before doing i-r test ?
And when testing r1=r2 do i have to test all valves and pump ?
Also as there is electronic control on oil boiler do i test at 500v l/ to earth only ?
Would be very grateful for any advice.

Thanks

 

[telectrix]

for your IR testing, i would short out L and N and test at 500v from there to E.

 

[sg spark]

Thank telectrix
should i disconnect element aswell ?

 

[Deleted member 9648]

Thank telectrix
should i disconnect element aswell ?

Not necessary...if you get a low reading isolate the element with the switch and test to establish whether the element or wiring is to blame.

 

[Deleted member 9648]

Hi guys
im normally ok with testing but not too sure when it comes to central heating systems.
When testing water heater do i disconnect heater element first before doing i-r test ?
And when testing r1=r2 do i have to test all valves and pump ?......I dont know anyone that does,I normally R1+R2 test to the isolator(earth disconnected to avoid parallel paths) only and record that,and R2 associated connected equipment to ensure continuity..parallel paths through pipes will give a false reading anyway but at least you confirm earthing to pump/valves etc
Also as there is electronic control on oil boiler do i test at 500v l/ to earth only ?....I wouldnt IR test a boiler...to risky as they are very complex and tempermental now.
Would be very grateful for any advice.

Thanks

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