Hi, I have a Heatmaker furnace HW-M2-100LP (https://www.heatmaker.com/v/vspfiles/images/pdfs/HSeriesManual.pdf) in a cottage. In the past it was keeping the cottage heated to 50F through the winter but I'm trying to shut it down this winter after winterizing the place.
Here are are what I did:
1. use air to blow water out of cold and hot outlets (kitchen faucet, bathroom sink faucet, shower faucet, toilet tank)
2. fill the pipes with antifreeze till it comes out of those outlets
The air/antifreeze were injected from the main water inlet of the cottage.
The furnace has a 20 gallon tank and little water was driven out by air in step 1 and I only used up about 8 gallon antifreeze in step 2, so I take it that neither step affected the water tank much.
This is my first time doing winterization so pardon my ignorance. While I was on site, this tank issue did not occur to me and I did not open up the enclosure of the furnace to look for a drain port (I did not seem to see one outside). Before I go up there again, I'd like to ask the experts here if the tank should have a drain port besides the normal water inlet/outlet. I did not see one in the manual either.
Or, is it that the tank is actually *not* holding the hot water (for domestic use) - rather it is for holding the glycol heating fluid? After reading the manual again, I seem to be inclined to the latter, and that would explain the little amount of water blown out in step 1 and not much antifreeze used in step 2. Figure 1 of the manual seems to match that assumption.
Another question that I have is about the pipe around the backflow prevention value and auto-fill valve (see parts 11 and 4 in Figure 16). I am not sure if the pressure in step 1 and 2 was strong enough to drive the "boiler feed water" in that section of the pipe into the heating fluid (glycol) line that goes to the baseboards; in particular, now I am not sure if I did it with the value 10 closed or open :-( I am concerned that if there is still water in that section of the pipe would it freeze and burst the pipes and valves. How normally and properly is that done?
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