Got a call from my foreman on a job where the back up generator won't fire properly. When the generator fires, the line pressure goes down below 7" wc which will not sustain the machine's motor. We installed a 2" regulator on a 2lb line feeding the generator. The questions asked when we ordered the regulator were incoming pressure and downstream demand. I wish they had asked us our wc requirements or what type of appliance we were feeding. The regulator came with a 5.5"-8" wc spring (standard for domestic appliances). Turns out we need an 8.5"-14" wc spring. And, guess who gets to buy and install the replacement spring? Mental note: When ordering a gas regulator, remember to include incoming pressure, CFH demand, appliance pressure demand in water column.
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