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edr of fan convectors

Bill GBill G Member Posts: 8
working on a job in philly i encounterd a number of multi-fan convectors; actually 4 fans per convector. The only name on the units were Herman-Nelson which apparently now focuses on comercial heaters. I had cabinets with dimensions of 80L x 18w.x 27h and 80Lx 14w x 30h. I cant find the edr for these units tp complete the connected load. Any help would be appreciated!


  • Hap_HazzardHap_Hazzard Member Posts: 1,349
    AAF HermanNelson

    They're owned by Daikin-McQuay. See if you can find what you're looking for here:

    You might also be able to find information here:
    1983(?) Peerless G-561-W-S
    3" drop header, CG400-1090, VXT-24
  • Bill GBill G Member Posts: 8
    edr of fan convector

    Thanks! I'll check it out!
  • Dave in QCADave in QCA Member Posts: 1,660

    A good thing to remember is that a convector has no fan.  The heat is disseminated by convection.  When a convector looking type of unit has a fan to induce circulation, it is called a fan coil.  The type of units that you are referring to here are Unit Ventilators, or more commonly called, Uni-vents.  They work great in classroom situations because they also have a fresh air connection and are able to bring in a required amount of fresh air in a classroom filled with breathing kids.  If the temperature of the room starts to increase above the thermostat set point, the dampers will index to let in more fresh air and the blowers will discharge cool outdoor air into the room.  If the temperature of the room happens to be lower than the set point, the steam or water valve, or sometimes the face and bypass dampers will index open so that the discharge air is warm, so as to bring the room temperature up to the temperature of the thermostat set point.

    Generally, the thermostat is a pneumatic or ddc type, and the controls within the Uni-vent modulate to maintain space temperature control.  This way, there are not cycles of on/off, or hot/cold, rather continuously modulation of discharge temperature to maintain a constant room temp regardless of what the weather is.
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
  • Bill GBill G Member Posts: 8
    edr of fan convector

    Dave, thanks for the eductaion! You're description is thorough and complete. Thanks again!
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