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Re: high humidity in my house

I think that where people get confused is that HRVs — or air conditioners without condensation, or shade, or whatever — do not change the actual moisture content of a volume of air — measured most conveniently by the dew point. Relative humidity is the relationship between the dew point — at which temperature the air mass holds as much moisture as it can without condensing — and the sensible air temperature, as measured by a normal thermometer. If you lower the sensible temperature, the relative humidity increases. Raise it, and the relative humidity decreases.

The only way you can lower the relative humidity at a given sensible temperature is to cool the air enough to lower it below the dew point, at which some of the moisture will condense out, and then warm it back up to where you want it.

Jamie Hall

Re: What would an “Expansion Tank Relay” been used for historically?

Pressure switch and the way the mercury switch is installed and the location of the spring and the bellows, it will function as a shut off on low pressure — that is, if the water level falls in the system, the switch will open.

Now how low is a very good question!

Jamie Hall

Re: Need help with new install of radiant with Buderus cast iron boiler

the bargain brand glycols have weaker inhibitor packages and lower protection rate. Stick with a name brand

I would buy a 30% premix, pump it out of the bucket into the system

hot_rod

Re: What would an “Expansion Tank Relay” been used for historically?

@109A_5 The knife switch does control the boiler. My doorbell transformer is at the front of the house. I’m not touching anything. As I said, I’m just happy with the vintage showpieces. When my thermostat calls for heat, it fires right up. That’s all I need. As the people who put this in is long gone, I already get the speech from local HVACs how I need to replace it because it’s old. Not because of issues, it’s just old 🙄. So I am not about to mess with something and it stops firing.

TheUpNorthState88

Re: The “Good Deed”

OK GW…. there is this thing called a power switch that you can toggle off and on in order to make the chance of letting factory installed smoke out of transformers. They are very easy to operate. For the most part if the electrician did his job properly, you just toggle the handle to the down position before you put your screwdriver inside the control. here is an example of what the switch might look like.