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Move or remove Johnson control A419 temp sensor and replace with setback thermostat for more control
'Low. I've got a 9 unit building where I occupy a store front/office. Older steam boiler with Johnson a419 controller with temp sensor in centrally located apartment with the sensor roughly 75 ft or less to the a419. The A419 is set for 76 degrees with 1 degree differential. The problem is that in my space which has 3 outside walls the temp swings are great. Last night it was 30ish degrees out and my space was 65 degrees when I came in. Boiler kicked in twice in 6 hours ( I think )and my space got up to 77 degrees. My temp is staying steady around 76. Outside temp today mid 40s.
I'm thinking that since my space has 2 more outside walls and more temp fluctuation than the "control" apartment it might make more sense to have the sensor with me in my space. If I do that I'd like swap the A419 and remote sensor for a standard digital thermostat with daytime, evening and weekend setback control. That way I could also fiddle with various thermostat temp settings in conjunction with radiator venting (in my space) in order to balance the building's overall temp.
There is an outside temp sensor but that hasn't worked for a while so I just make sure it allows heating.
My question, can I just clip the wiring from where it goes into the A419 and splice it to the proposed setback thermostat without other alterations? It would only be about 30 feet from the burner. Second question is as to the wisdom of my strategy. Hoping to replace boiler in next year or 2 if that makes any difference.