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Buderus GB142 Circ pump question
My installer just finished installing my GB142-30 today. He was not too familiar with the unit. In addition to the primary circulation pump on the low loss header, he installed a secondary taco circulator as well. It is a one zone system without DHW. The secondary circ. pump, which he told me actually pumps the water through the rads, comes on when the unit is turned on and then shuts off and doesn't seem to be working properly. I'm not sure if the separate electrician that wired everything up wired the secondary circ pump to the correct place. The first pic shows the external connection board. Pk (left) is the primary pump in the LLH, PZ (2nd from right) is the secondary circ pump, and Netz(right) is main power. The terminal that the secondary circ pump is wired to is labelled as DHW recirculating pump in the install manual. Should it be piggybacked to the same terminals as the primary pump? I know that if this system consisted of more than one zone, the zone pumps would be wired to a zone controller and that would be wired to the primary I think. I need help. I just spent a ton of money on this system and my boiler guy didn't do and doesn't know any wiring. The electricians managed to mix up where the AM10 and the thermostat connect, so maybe they also wired the secondary circulation pump also? Thanks in advance for taking the time to read this and hopefully help me.
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