Help with Thermostat wiring

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Recked

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Hey I was wondering if someone could help me change the thermostat for my boiler. I want to change it from a tekmar 508 to a programable honeywell rth7600. I'm not sure where to attach the wires labeled 5 and 6 with the word Heat under them. The Honeywell has the letters C/G/Y/W/RC/R. RC has a jumper to R. Below is a diagram of my current wireing. Replaced white wires with purple so it would show on diagram.

Thanks,

Recked
 

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