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I am wondering if VAV boxes minimum flow setting can be adjusted higher without rebalancing the min/max with a TAB contractor. For example, adjusting via the BAS the minimum flow from 25% to 35% to increase the outdoor air fraction in the spaces. The box sensor will be able to read the flow. An...

For a retrofit project with a 40 years old sprinkler system. Would it be acceptable to have branch lines and main pipes at a water velocity of about 110 ft/s. A high rated fire pump would be added, but this would avoid replacing the small diameter piping in the existing tenant spaces. Is there...

Hi, We have to evaluate the power consumption at steady load of a fluid cooler which have at 600V an FLA of 23A. That would give approximately kw = 600 x 23 x 1.73 = 23.9 kw or 32 hp. However, the fluid cooler has only a total of motor of 6 x 1.5 hp = 9 hp (plus a small amount for the...

Hi, We have to evaluate the power consumption of a fluid cooler which have at 600V an FLA of 23A. That would give approximately kw = 600 x 23 x 1.73 = 23.9 kw or 32 hp. However, the fluid cooler has only a total of motor of 6 x 1.5 hp = 9 hp (plus a small amount for the controls). Where does...

Hi Guys, We want to use an existing uninsulated fresh air ductwork hidden in ceiling to cool a post office by adding a DX cooling coil at the supply. Should we be concerned about the condensation on the ductwork exterior surface hidden in ceiling which is not a return air plenum (no air...

Hi everybody, We just installed a new stainless steel condensate return tank. Is it necessary to use dielectric fittings to connect black steel piping on it? Any danger of galvanic corrosion between stainless and black steel over the years? Thanks Alex

I will install a liner in the first 10 feet of supply (10 tons, split system). Should I do the same in the ducted return?

I want to install a new split system York, 10 tons, 2 stages with air bybass. Do I need to install a temperature sensor in the supply to prevent coil freezing.