Join Date: Aug 2018
Location: Lowell area, MA
Mentioned: 3 Post(s)
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Your picture seems to show 3 electrical contacts. I would typically expect that to be for 110V from the generator, not 220V from the generator. Getting 220V from the generator would typically require 4 electrical contacts.
Is it definitely a 220V transfer switch? With a 50A output from the generator, that is definitely a 220V output.
Anyways, don't change your 40A breaker to 50A. If the actual wiring is only rated for 40A, then using all-50A breakers is unsafe, you risk overloading and overheating the wiring. If it was wired for 40A, and the wiring is sized for 40A, then leave the 40A breaker. Whichever one trips first will protect you. The house's 40A will trip, rather than the generator's 50A, which should be OK.
So you'll get 40A max from the generator, which is 8800W. That's pretty close to the unit's 9400W max (on gas), so you're not limiting yourself much anyhow.
Is the AC a window unit, or a whole-house unit? If it's a window unit, you should be fine with 40A and 220V. What kind of heat? I'm assuming oil or natural gas. If it's electric heat, that's a different story, that would be a much higher draw. I'm assuming the hot water is not electric.