WaterFurnace Envision Hydronic (NDW) - Manual (Page 9)

9
NDW INSTALLATION MANUAL
Field Connected Water Piping cont.
Closed Loop Tower/Boiler Systems
The water loop is usually maintained between 60°F [15.5°C]
and 90°F [32.2°C] for proper heating and cooling operation.
This is accomplished with a cooling tower and a boiler.
To reject excess heat from the condenser water loop, the
use of a closed-circuit evaporative cooler or an open type
cooling tower with a secondary heat exchanger between
the tower and the condenser water loop is recommended.
If an open type cooling tower is used without a secondary
heat exchanger, continuous chemical treatment and filtering
of the water must be performed to ensure the water is free
from damaging materials.
CAUTION: Water piping exposed to outside
temperature may be subject to freezing.
Open Loop Well Water Systems
Installation of an open loop system is not recommended
unless water quality guidelines are met.
Earth Coupled Systems
All supply and return water piping should be insulated to
prevent excess condensation from forming on the water
lines. Ensure pumping system is capable of providing
adequate flow rate at the system pressure drop, 3.0 GPM
per ton [0.054 LPS per kW] (source side) is recommended.
Antifreeze in the loop is strongly recommended.
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