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Tekmar 508 to 561 Thermostat install.

bdelegan
bdelegan Member Posts: 1
in Radiant Heating
For my single stage radiant heating system, I'm replacing some incredibly difficult to use Tekmar thermostats with some easier to use Tekmar 561 wifi thermostats. In the master, I have successfully replaced a Tekmar 512 with the 561. In the main living area, I'm struggling to go from Tekmar 508 to the 561.

508 has C, R, S1 (sensor 1), S2 (sensor 2), 1 green heat wire and 1 red heat bridge to R

561 has C, R, Away, RH1, W1, SEN/COM, S1, S2

This is what I have:
C to C
R to R
R to RH1
S1 to S1
S2 to S2
Green to ? - in the master, I have wires for both away and w1. I've tried both with no luck.

Thermostat powers on and reads temp but doesn't switch on/off heating.

Any ideas on what I should do?

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