Voltage Free Time Clock?

Hi everyone,

I am looking to know what the difference is between the Horstmann H27XL and H27ZXL.

Specifically what it means by "voltage free"? I am looking to get one of these to replace a time clock that is being changed as I am upgrading heating controls to an S-plan arrangement giving me independent heating and hot water.

Thanks!
Regards, Robin.
2011 MFW # 34
Mortgage starting balance at Sept 09 - £127,224 on 30 year term. Currently balance approx £116,945 (Updated Jan '12)
Estimated MFD - [STRIKE]Sept 2039[/STRIKE]
, April 2031 (in progress!)

Comments

  • DVardysShadow
    DVardysShadow Posts: 18,949 Forumite
    'Voltage free' means that the switch has external connections to both [or all 3] of its connections. You must connect the supply to one contact and the load to another contact. There is no internal connection providing a supply to the contact.
    Hi, we’ve had to remove your signature. If you’re not sure why please read the forum rules or email the forum team if you’re still unsure - MSE ForumTeam
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