jimmycooker
Member
Hi,
I was hoping someone could help me, I have on / off thermostats in my house and I would like to replace them with proportional controllers so my new gas boiler which can modulate from 2.8kw output upto 28kw output does not cycle on and off, but instead stays on and modulates the heat output depending on the required load.
First of all, im not even sure this is going to work the way i think it is, but my idea is to put a 0-10v actuator on the existing on / off zone valve or thermostatic valve so that it opens and closes based on the output of a proportional thermostat.
Because the existing stats are connected with 2 or 3 wires I cannot install a 4 wire controller (24V in / 10V control out) in place so was wondering if these mechanical (3 wire) old school honeywell thermostats would do the same thing and do a good job at maintaining the temperature setpoint at all times.
Also, these units are very expensive, so any other 3 wire alternatives would be great.
Thanks,
James.
http://www.pexsupply.com/Honeywell-T921A1183-135-Ohm-Proportional-Thermostat-13-C-to-29-C
I was hoping someone could help me, I have on / off thermostats in my house and I would like to replace them with proportional controllers so my new gas boiler which can modulate from 2.8kw output upto 28kw output does not cycle on and off, but instead stays on and modulates the heat output depending on the required load.
First of all, im not even sure this is going to work the way i think it is, but my idea is to put a 0-10v actuator on the existing on / off zone valve or thermostatic valve so that it opens and closes based on the output of a proportional thermostat.
Because the existing stats are connected with 2 or 3 wires I cannot install a 4 wire controller (24V in / 10V control out) in place so was wondering if these mechanical (3 wire) old school honeywell thermostats would do the same thing and do a good job at maintaining the temperature setpoint at all times.
Also, these units are very expensive, so any other 3 wire alternatives would be great.
Thanks,
James.
http://www.pexsupply.com/Honeywell-T921A1183-135-Ohm-Proportional-Thermostat-13-C-to-29-C