Zone Control on LPHW Heating System
Zone Control on LPHW Heating System
(OP)
This might be a failry broad question but I have a building with 3No. LPHW heating circuits serving radiators in north/centre/south zones.
Temperature control at the moment consists of 1No. thermostat controlling a common mixing valve.
I am proposing to provide individual temperature control for each zone/circuit in an effort to reduce the energy bill for the building. This would be done by seperate stats controlling individual mixing valve on each circuit and inverter control on the main boiler injection pump.
Does anyone know what effect this may potentially have on energy consumption/bills as in a percentage reduction etc.
Temperature control at the moment consists of 1No. thermostat controlling a common mixing valve.
I am proposing to provide individual temperature control for each zone/circuit in an effort to reduce the energy bill for the building. This would be done by seperate stats controlling individual mixing valve on each circuit and inverter control on the main boiler injection pump.
Does anyone know what effect this may potentially have on energy consumption/bills as in a percentage reduction etc.





RE: Zone Control on LPHW Heating System
For energy reduction I'd recommend variable speed pumping on your secondary loop and 2-position valves on the loops. Without fully understanding the system it be harder to get more in depth.
RE: Zone Control on LPHW Heating System
The system consists of 2 LPHW boilers feeding o low loss header arrangement via 1 boiler injection pump and diverting valve controlled which is controlled by an immersion stat in the return o the boiler.
The low loss header feeds 2 circuits. The first of these serves a heating circuit with time-clock control on the pump only.
The second circuit is actually a header system with 3 circuits controlled via a timeclock for each circuit and a common 3-port mixing valve controlled by a single room stat.
Hope this is somewht clear description of system without going into too much detail.
RE: Zone Control on LPHW Heating System
RE: Zone Control on LPHW Heating System
I'm attaching a hand sketch of the system which I did on site. Hope it comes out alright.
RE: Zone Control on LPHW Heating System
I like simple. No problem with your idea of splitting zones. I do have a problem with more 3-ways and more complexities. See/digest attached suggestion and post back when you can.
Best, CB
RE: Zone Control on LPHW Heating System
I agree with your 'keep it simple' philosophy.
Are you suggesting omitting exisitng 3-port valve arrangements? I would be a bit reluctant too change too much a system which appears working fine at the moment.
I'm assuming the v1 lets the boiler injection pump act as a shunt.The VFD's could still work in conjunction with V2
RE: Zone Control on LPHW Heating System
Do you have a written sequence of operation for the system that you could also upload?