Y plan heating but no independent CH.

[David147]

This is Honeywell's recommended wiring (ignore pump overrun - you boiler doesn't have it):

Yep, that is how it is! Very clear diagram

 

[David147]

Please confirm that your boiler is a Glowworm Spacesaver 50 MkII - GC No 41-313-03 (on the data plate or Manual).

Does this affect the control of it?

 

[D_Hailsham]

Does this affect the control of it?

Just wanted to confirm that the connections were the same as other Spacesaver boilers. Unfortunately the Installation Manual is not available online.

 

[D_Hailsham]

The programmer is set to Gravity fed (G) and Linked (L) with the jumpers on the back.

Don't understand what you mean by "Linked (L)". There is only one jumper on the back which is in either the G or P position.

 

[D_Hailsham]

Don't understand what you mean by "Linked (L)". There is only one jumper on the back which is in either the G or P position.

I have managed to answer my own question.

The BG UP2 is actually a Drayton LP822, not a LP722. The LP822 has three jumpers on the back: Pumped/Gravity; 1/5/7 day and Linked/Independent

The L option sets the CH and HW to have the same times; The I option allows separate CH and HW times

For a Y Plan they need to be set to P and I (1/5/7 day as required). You still need to install the missing wire.

 

[David147]

Thanks, yes missing wire now installed but If I+P are set, the timer works but setting 'CH only' illuminates the HW light too. Guess as previously suggested it depends on the sequencing.

 

[D_Hailsham]

Thanks, yes missing wire now installed but If I+P are set, the timer works but setting 'CH only' illuminates the HW light too. Guess as previously suggested it depends on the sequencing.

There are two ways of getting CH only:

Set programmer to CH On and

1. Set the programmer to HW Off or
2. Set programmer to HW On and cylinder stat low (so HW is satisfied).

Does the HW light come on in both scenarios?

If it does, contact Drayton and seek their advice:

Customer Services 0333 6000 622

Technical 0333 7000 622

Email [email protected]

 

[David147]

There are two ways of getting CH only:



Does the HW light come on in both scenarios?

If it does, contact Drayton and seek their advice:

Customer Services 0333 6000 622

Technical 0333 7000 622

Email [email protected]

Yes, it does! but thanks for all the answers. I will give them a call....

 

[stem]

Guess as previously suggested it depends on the sequencing.

Not really in this instance, the sequencing should be correct if controlled by the programmer, for example it won't allow hot water 'on' and hot water 'off' to be live at the same time. I only mentioned the sequencing when you were making connections of the grey wire to a live that wasn't via the programmer during fault finding.