Changing potterton prt100 st whit salus rt500 need help whit wiring

[AlexS47]

Hi, I what to change my thermostat... the old one was a potterton prt100 st and the new one is a salus rt500.
At the potterton prt100 st I have 3 wires :
Blue is in 4 - N
Red is in 2 - H
Yellow is in 1 - TL

At Salus rt500 I have
L and SL no N.
Can you please tell what wire goes in L and what wire goes in SL and what I do whit the wire in N.
I mention I have central heating Vaillant ecotec pro24. Thanks

 

[kenny7askew]

Hi.looks to me like like the red goes in L and the yellow goes in SL,you dont need the blue that should be placed in a blank connector