The Ontario Building Code | Cooling Units
6.2.10.1. Cooling Units
(1) Where a cooling unit is combined with a fuel-fired furnace in the same duct system, the cooling unit shall be installed,
(a) in parallel with the heating furnace,
(b) upstream of the furnace, provided the furnaceis designed for such application, or
(c) downstream of the furnace, provided the cooling unit is designed to prevent excessive temperature or pressure in the refrigeration system.
6.2.11. Storage Bins
In Plain Language
Where a cooling unit is combined with a fuel-fired furnace in the same duct system, the cooling unit must be installed in one of several specific configurations, like in parallel with or upstream of the furnace, to prevent equipment damage or unsafe operation.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.