Swapping Drayton HTS3 for Honeywell L641A

[AJC24986]

Good afternoon,

I wondered if someone could help me. I am wanitng to swap my very old Drayton HTS3 Cylinder Stat for a new Honeywll L641A Stat.

Could someone possibly confirm the wiring for swapping these two out.

The HTS3 layout is :

1 Call For Heat
2 Satisfied
C Common

The Honeywell Guide says:

Use connections C and 1 when system operation is required on temperature fall and that Terminal 2 used on Y-Plan Systems

http://www.plumbase.co.uk/link/1/h001557_272_t.pdf

Cheers

 

[D_Hailsham]

The terminals are identical on the two stats, so C=C, 1=1 and 2=2.

If you have zone valves, C and 1 will be wired.

View media item 11762
If you have a mid-position valve, C, 1 and 2 will be wired.

View media item 5946

 

[AJC24986]

yes we have a mid position valve so that makes sense.

I just wanted to check before running into any potential issues.

I'll wire it up identical

Many Thanks