"You forgot one John! 10. Co2 level for IAQ according to Environmental Sensitivity not minimal acceptance for Air Quality. This is like saying what I can do to get away with it. Reason I can say this is the acceptable level of Air required for…"
"Steps to Indoor Air Quality by Priority:
1. Test for and Mitigate Radon as found.
2. Seal the leaks for air infiltration.
3. Moisture Control
4. Pest Control
5. Seal Ducts, Pressure Balance and ASHRAE 62.2
"Sorry I disagree on the theory of using large amounts of electricity to run the fan. Yes when talking an older system you will use much more than a 3 or 2 stage however by not running all the time you loose in the amount of infiltration into the…"
"It sounds like a mouse, I've removed dozens from the blades of furnace blowers. If you have to cut the flue to remove the fan that's a poor install. The blower assembly is actually easy to remove, take the control board off and tie it out…"
"Long thread - haven't read all the replies but "It Depends" is my right answer.
Fix minor comfort imbalances (hopefully equipment is sized to run near-continuous anyway...)
"I have a 3 ton GeoComfort geothermal unit with a ECM fan from Enertech. I can read my electric meter accurately to see the wattage used when in the 600 cfm fan mode (1300 cfm in 1st stage heat mode) and came up with 60 watts. So it appears as if the…"
"Just received my gas bill. This is just additional information and I don't have exact day for day analysis but on the days that were very cold I just left the fan on. Otherwise, I switched it back to auto. For 11/16/-12/16,…"
"Yes, I own a HVAC Company in central Kanas, - A slight pitch is not a problem but shouls be avoided if possible. The A/C Evap coil and Recuperative coils in the furnace may hold more water. If your furnace is lower at…"
TJ I took my 'block wall IR' training from unitedinfrared.com. If you want to go this route; as for Peter and tell him I said to give you the BPI courtesy discount.
Any way; the theory is that the sun needs to heat the wall, (solar loasding), sufficiently to allow the cooler cores to show the Delta T needed. Similar to flat roof scanning where we can locate moisture under a roof membrane and prior to interior ceiling damage.
You will need to take scans at different intervals and camera settings through out the day. This way you can compare images and capture the best anomalie. The color setting usuallly works best in IRON Bow or similar. You will also have to adjust the camera range at 20 degrees from high to low.
That is why interior IR doesn't work as well. The masonry wall will be more uniform through out unless there is a major moisture leak or perhaps heating duct break in the wall. I would suggest going out side and scanning some block walls at different times to get a feel for it. The sun hits different wallls at different levels so more than 1 wall cn be tested.
How are you progressing on your 'wall scan"?
One comment on the continuous running furnace fan; did the customer put the fan on 'run' instead of auto? Is the furnice an older moel that has a blower control thermostat in the hot air plenum that controls the fan and is defective?
It will cost energy to continuously run the blower and could cause excessive wear and tear and failure.