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Good morning,

I've had a look at a few threads featuring a horstmann H37XL however the wiring on the posts is slightly different in that our box has 2 lives, earths and neutrals.

Our central heating is a 2 zone controlled by Drayton ZA5 aculators, oil fired and currently using the horstmann programmer, aided by 2 electronic thermostats.

I know I need to have 2 nests to operate both zones but would love some help with the wiring as it's the first time I've installed a nest system.

Thanks in advance.

G
 
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