Call a Generator guy! Call Lee!
Erich Kaiser North Central Tower [email protected] Office: 630-621-4804 Cell: 630-777-9291 On Thu, Jul 7, 2016 at 4:15 AM, George Skorup <[email protected]> wrote: > Our gas meter is rated 5" w.c. and 175 cu.ft/hr. We have two furnaces > rated 120k BTU/hr, 3.5" w.c. min pressure, 13.8" max. So that's all fine > and good. Now add in our Generac at 316k BTU/hr and 5" min, 14" max. > Obviously that meter isn't enough. But we're going back and forth with our > rep about pressure. She says we can get 1/4 PSI and a 425 meter. Or 2 PSI, > but that has to go through engineering, and I fear it's going to take a > long f'n time. > > So we need like 556k BTU. Is it safe to assume that we can get that out of > a 425k meter and accept the pressure drop (a little over 600k @ 2" drop, I > assume anyway)? The Generac demand regulator can't run lower than 5", so I > just don't know if the standard 1/4 PSI / 7" meter is going to be enough. > The generator is less than 20 feet from the meter though. More like 12 feet. > > Only one furnace is wired to the generator. However, I can see a scenario > where the generator controller wants to run when utility voltage is sagging > (starts at 192 volts or less), but the furnaces may be fine at say 90VAC. > So we could potentially have both furnaces and the generator running at the > same time. In reality, the furnace thermostat that's on the generator will > be cut off by one of the transfer switch's smart contacts, so the furnace > won't run. But we might have to disable the lockout in the winter if power > is out for days and the building starts to freeze. > > I'm thinking just do the 2 PSI delivery now in case we need a bigger > generator later, but I can't wait months for the gas co. to get their heads > out of their asses. > > Probably should just call a plumber, but I'm lazy, and cheap. >
