>My plan was never to use this LG mini split wall unit for heat but in >looking for a way to A/C the sun room I am building I found they are also >heat pumps so I want to use the heat feature. I have a 24 volt DC >controlled hot water heated floor (in the concrete poured floor) in my sun >room (uses a heat exchanger and my house water heater - simple and neat). >The heated floor is in now.
> LG offers an add on circuit board (PQDSBC) (I can email a copy of the >booklet if need be) for this LG unit - is there anyway to control an >external relay so when the LG unit is making heat the LG unit provides a DC >current to close a relay? Or a way to get a signal off that board to >somehow power another circuit board (which I can make if need be) to then >close a relay? Or a way to get a signal off the LG unit (LA120HSV2) so when >it is providing heat I can control the floor heat with a relay or? This >would require 2 thermostats and that would be OK with me. The heated floor >would be set at maybe 65 degrees on a 24 volt Honeywell mercury type >thermostat. The LG unit would be set lower than 65 degrees on its digital >LG direct wired wall thermostat so it does not run on cold days. The in >floor heating would keep the room at 65 degrees but it is very slow to >bring the room warmer. To heat up the room quickly just raise the LG >thermostat and every time the LG provides heat the pump for the heated >floor would also run keeping the floor warm. You would have 2 heat sources >running simultaneously when you raise the temp over 65 degrees. You would >run wires in parallel to the Honeywell thermostat. When you turn the LG >unit down the in floor system maintains the room at 65 degrees and the LG >unit does not run.If I can not do this every time I raise the LG unit for >heat the in floor heat would shut off as it would be set at 65 degrees. Had >a known this earlier I would have put a PVC tube in the floor so I could >put a probe in the cement in the heated floor. I have not yet tiled the >floor so I could still install a probe under the tile. >--