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  1. Designer_82

    Constant Flow Primary Chilled Water Pumps Local Disconnect

    Chilled water System with 3 Constant Flow Primary Chilled Water Pumps. NEC requires local disconnect for all motors. These pumps are fed from MCC starter buckets. MCC's are located in different room/area. Do these pump motors usually come with integral disconnects or something? Or do you...
  2. Designer_82

    Does this look compliant?

    Residential installation, single building with 16 townhomes. Would appreciate it if you notice anything that does not look code compliant. Thanks Pictures https://postimg.cc/LqcmmjXz https://postimg.cc/YvmpZX2p https://postimg.cc/z3cYNnc3 https://postimg.cc/QFZPNSkN...
  3. Designer_82

    open delta 3 phase voltages - 2 single phase transformers

    What would be the 3 phase secondary voltage from this configuration? Would it be 208v or 240v 3phase? Thanks https://postimg.cc/N5Y26xj4
  4. Designer_82

    HVAC unit whistling - return duct too small?

    Residential unit with heat pump, outdoor condenser. The unit is whistling and all fingers seem to be pointing at undersized return duct. The system design is 900 CFM and return duct is sized 14x12. This equates to a sizing with velocity at 800fpm. From all sources I could find, the indication...
  5. Designer_82

    Should elevator vendor size fused disconnect switch?

    Should the elevator vendor size fused disconnect switch, Or should it be the project engineer of record, per your experience?
  6. Designer_82

    Small Garage Ventilation Requirements - R2 Multifamily

    The building is a small 4 unit multi-family with a private 2 car garage (Type S-2). I'm not clear whether mechanical ventilation would apply here or not. It is not a public garage so I am leaning towards now but I'm not sure. Would appreciate your thoughts. Picture of the architectural plan...
  7. Designer_82

    Mechanical Closets - drywall ceiling required?

    The contractor installed the sprinklers exposed pvc in the mechanical closets. Found out the builder didn't drywall the ceilings in these closets due to a lot of piping. My question is, are these closets required to have drywall ceiling per code? Pictures for reference...
  8. Designer_82

    NFPA 13R - Multifamily with attic access

    I'm working on a project that is 3 stories with attic, multifamily residential, type VA construction. We designed the system to NFPA 13R, with no sprinklers in the attic. Now the architect wants to add access to the attic for the 3'rd floor tenant. (note, there's only one tenant on the 3rd...
  9. Designer_82

    NFPA 13R residential system - Exposed CPVC

    A multi-family fit up project will have existing to remain upper floor and new first floor apt. units. Currently the building is not sprinkled and will have a new sprinkler system. The contractor wants to run the new sprinkler pipe exposed using CPVC in the existing upper level units. NFPA 13R...
  10. Designer_82

    Elec. Service Equipment Old/Rusting - Replace?

    Working on 4 unit multi-family complex where the inspector has raised concerns about the exist. elec. service equipment. The meter centers and main disconnects are rusting to the point where he feels they might not properly function, perform their interrupt function etc. I'm unsure at what...
  11. Designer_82

    NEC 220.56 kitchen equip. demand factor to walk-in cooler/freezer

    I'm working on a supermarket project that has a bunch of walk-in coolers/freezers for storage and clear glass displays. Do you normally apply 220.56 kitchen equipment demand to the above or just go conservative and use 100% demand? Thanks
  12. Designer_82

    Changing service from 1 phase to 3 phase

    Working on a mixed-use building (retail/residential) currently supplied by single phase service. The single phase needs to be upgraded to 3 phase to handle some larger loads going in one of the retail spaces. There's an existing 1 phase meter center. I'm unsure if there would be any problems...
  13. Designer_82

    IMC Section 403.2.1 - Recirculation of Air

    The mechanical code Sec. 403.2.1 - Recirculation of Air says that "The outdoor air required by Section 403.3 (Group R-2, R-3 and R-4 occupancies three stories and less in height above grade) shall not be recirculated." Does that mean you can't duct the OSA into the return of the air handler?
  14. Designer_82

    Air handlers/ Water heaters in Attic

    A 5 unit multi-family project I am working on has an attic on top of the 5 apartment units. Are there any issues with putting the tenant air handlers & water heaters in the attic? Thanks
  15. Designer_82

    Open Parking Garage Ceiling - Freeze Protection Heating

    I am working on a project with an open parking garage. The ceiling of the open parking garage will be a drop ceiling. We are providing three 5kW elec. unit heaters above the drop ceiling to protect the water piping. Do you think this will be adequate to prevent pipes freezing in Boston area...
  16. Designer_82

    Water Pipe Freeze - Open Parking

    Project I'm working on has an open parking garage that will have a Drop Ceiling. Design requires some hot & cold water pipes routed above this drop ceiling. HVAC engineer provided unit heaters above in order to prevent the pipes freezing. My question is whether the unit heaters provided would...
  17. Designer_82

    Unit Heater Above Cold Room

    Industrial warehouse building is adding a large cold kitchen to an area of the building. The cold kitchen will have drop ceiling, although I'm not entirely sure of the architectural details at this point. There's an existing electric unit heater above where the cold kitchen will go. Would it...
  18. Designer_82

    3 phase motor disconnected - everything fried

    Bit of a strange situation where a building owner has a 3 phase electrical system (for educational/assembly building roughly 18,000 sq.ft). They installed a 3 phase motor (I assume it's actually a motor based on what owner said). No one actually knows why this "motor" was installed. They assume...
  19. Designer_82

    Fan coil units - 19 ft. ceilings

    Have a project with a large worship room with 19 ft. drop ceilings My HVAC engineer says fan coil units don't provide enough power for this height. Would like to check if you agree with this? Thanks
  20. Designer_82

    Bathroom Exhaust Fan

    Dwelling unit bathroom exhaust fan has the exhaust duct run pretty far and it's not pulling any air. Is the typical solution to this a booster fan or something else?

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