Re: Original dometic ac replacement options
Reply #25 –
Yes Brett a continuous operation of the evaporator fan sets up a vicious cycle just as you stated. You pay dearly to condense water on the coil, but as soon as the compressor cycles off the evaporator fan only blows that moisture back into the space be it an coach or any other building or space. Most residential units will also run the fan for a few minutes (sometimes adjustable on the control board) to bleed off the pressure on the ref. liquid line or "high side" to prevent compressor damage when it short cycle's. Increasing the unit size will make matters worse, as the compressor is off more and humidity levels rise and you feel clammy. The only good way to prevent this is to allow the compressor to run and reduce the evaporator airflow so that coil surfaces remain below dew point. They good news is that running compressors continuously adds to there lifespan as starting is done on somewhat oil dry bearings. Just found out yesterday, when I ask a vendor how much extra a variable evaporator air volume packaged HVAC unit would be because I'm working on an exercise facility where humidity is a major issue and they wanted cheap, cheap, cheap. New DOE requirements make this standard. BTW I run my 1800 sqft house on 2 tons and it was built in the 50's and not super insulated. 1990 Compressor runs pretty much 24/7 for 4 months and house temp will climb to 80 when it 110 outside but it's a dry heat inside and totally comfortable
Topic: Original dometic ac replacement options