Waterfurnace Series 5/Stage 2 Water Flow Rate?

Discussion in 'General Discussions' started by batman71, Feb 27, 2024.

  1. batman71

    batman71 New Member

    During stage 1 heating the flow rate is about 5 gpm. System is equipped with a modulating valve. What is the recommended flow for stage 2?
     
  2. SShaw

    SShaw Active Member Forum Leader

    Nominal recommended flow rate is 1.5 to 2.0 GPM per ton of cooling capacity for open loop.

    You can download the submittal data document on the Waterfurnace website and look at the performance tables. The tables list performance vs EWT at different flow rates for low/high speed.
     
  3. batman71

    batman71 New Member


    Yes, I noted in the installation manual the recommended flow for open loop. With a 3 ton unit, that translates to flow of 4.5 to 6.0 gpm. The performance tables are based on 8 gpm 9 gpm for the two stages. So, clearly the flow rates shown in the performance tables do not relate to the recommended flow rates for an actual installation.
    I am still not sure what the recommended flow rate is for stage 2.
     
  4. SShaw

    SShaw Active Member Forum Leader

    It's 9.0 GPM. The assumption is you have EWT around 50F, in which case you will achieve the AHRI rated performance listed in the manuals.
     

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