Bradford White combi-core
Bradford White combi-core not heating
Every once in awhile you come across a good install, but poor design. Here we have a Bradford White combi-core (Boiler) hwt. These tanks heat both the domestic and hydronic water without mixing the two. The first thing I look for when I'm called out on a no heat boiler call is water pressure, and in this case there was no gauge. Not only was there no gauge...there was no pressure relieve valve. I determined there was massive amounts of air in the system, the pressure regulating valve was shot (no water coming in), and their expansion tank was faulty.
What we replaced and added
I replaced the expansion tank, replaced the cheap pressure regulator valve, added a pressure relieve valve and pressure gauge. Now if they ever have issues again with their Bradford White combi-core at least the tech can see if there is pressure in the system ... and if the pressure gets to high it has a place to go. I also found a faulty Wirsbo zone valve, and of course replaced it as well.
Navien Combi Boiler Weekend Home
Navien Combi Water Heater
At first glance I was taken back a little by the material being used in this water heater system. I have never seen black rubber hose being used in a in-floor application. It was not only the rubber hose being used but the size of the hose, 1/4" Id just does not seem like a lot of surface area to me for in-floor.
The black hose simply pushed into the copper pipe to make a manifold, the pressure of the system keeps its sealed. My research concludes that 45psi is the max these connections could hold back. We are running 12 to 20 psi.
Here you can see the older Combi-Core water tank that was used to heat both their domestic as well as there hydronic heat. The mixing valves being used appeared faulty and both expansion tanks where bad.
Navien Combi Water Heater ... cont.
Navien has really out done themselves in my book with the Navien Combi Water Heater. This unit not only heats your domestic water, but also heats your home ... all in the same box.
The Navien CH-240 tankless bolted right up on the exterior wall and really was plug and play, well of course we had to build a primary manifold and modify the existing loop to be a secondary loop ... but not to complicated.
We controlled the Navien Combi Water Heater boiler system with the new ecobee Wifi thermostat, this way my customer can change thermostat settings from a remote location. And this being a weekend home it will work out great.
American Standard Furnace 80%
Like for like 80%
Here we have an American Standard Furnace 80% that was replaced with a new American Standard Furnace 80%. What we call "like for like". It is by far one of the easiest types of replacements, especially if its located in the garage.
Now in my opinion this furnace should have lasted a lot longer. One issue that caused a short life was a poorly sized filter system, a small filter gets clogged way to fast making it difficult for the owner to keep up with and then eventually causing high limit failures(over heating). Also if the furnace had been vented with double wall pipe instead of galvanized single wall pipe, there would have been less internally corrosion (white dust) that clogs up pressure ports and causes excessive wear on the inducer. We find this a lot in very cold garages.
Like for like 80% cont.
Here you see the new American Standard furnace and a Bradford White hot water tank installed. The new equipment is vented with type B double wall venting that will eliminate internal corrosion. We also added a Honeywell filter system.
And as you can see the Honeywell F100 4" fits perfectly on top and usually provides annual protection but I do recommend checking every 6 months.
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