We have an apartment where the tenant has just moved out. There is a problem with the heating system in that the Honeywell thermostat is not controlling the in line pump in the apartment. There are three apartments fed of one continous loop with the gas fired water heater in the basement. In each apartment the line branches off the main circulating loop. Immediately off the main loop on the branch loop is a pump??? that is controlled by the thermostat....I think. It is a Honeywell Pump and has two 6 amp breakers and a transformer. The previous tenant removed the transformer from the box and placed it externally and seperately but adjacent on the wall. Through some fancy wiring he passes from the mains side of the fuse box through the transformer and appears to bye-pass the breakers straight to the pump.
We changed the thermostat, still doesn't work, all radiators in the apartment on the loop heat up. We have to turn each radiator off to control the temperature.
I am thinking that this it is the pump. The problem is this is an old system and I am not sure of the replacment part. I have a picture but that is about it.
Can someone confirm that my understanding of the system is correct and their thoughts as to what the problem might be?
Thanks for taking the time to consider and respond.