The proposed design has 9 floors and has heat recovery chillers, air-to-water heat pumps and natural gas boilers for the heating plant. Based on Table G3.1.1A, I selected System 5. Based on G3.1.3.2, I selected electric boiler as the predominate heat source is electric.

Based on G3.1.1 exception b. I have some spaces that require a single zone system. As the building has Fossil/Electric Hybrid heating, I select System 3 - PSZ-AC. My question is: should the heat source of these systems be gas furnace as per Table G3.1.1A or should I select electric resistance as the predominate heat source is electric?

Thanks for any insights!

Christopher Jones, P.Eng.
Halsall Associates
Tel: 416.644.4226 * Toll Free: 1.888.425.7255 x 527 * www.halsall.com
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