Figure 27 Flow Rate (GPM)vs. Head Loss (feet)for CX- Space Heating
The internal space-heating pump must be set to setting 3. The boiler pump is designed to
circulate through a short, primary loop only.
To simplify the control application, promote good loads and flow management, installers must
conform to the piping design configurations provided.
Propylene glycol usage
Warning
Do not use automotive-type ethylene or other types of automotive glycol antifreeze, or
undiluted antifreeze of any kind. This may result in severe boiler damage. Installers
must ensure that glycol solutions are formulated to inhibit corrosion in hydronic
heating systems of mixed materials. Improper mixtures and chemical additives may
cause damage to ferrous and non-ferrous components as well as non-metallic, wetted
components, normally found in hydronic systems. Ethylene glycol is toxic, and may be
prohibited for use by codes applicable to your installation location. For environmental
and toxicity reasons, IBC recommends only using non-toxic propylene glycol.
Note
Any glycol solution used in the system must be non-toxic due to the DHWheat
exchanger.
Propylene glycol solution is commonly used in a closed loop where freeze protection is required.
Its density is lower than that of water, resulting in lower thermal performance at a given flow and
pressure. Generally, a 50%:50% solution of propylene glycol and water requires an increased
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