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LAARS HEATING SYSTEMS
or zone circulators) in the same manner as any
other residential boiler.
Caution
The EBP/EDP appliance must not be direct
connected to a heating system utilizing oxygen
permeable tubing (see warranty). Provide a water to
water heat exchanger between systems to prevent
corrosion of tank or other components. Non-toxic
heating system antifreeze may be added to the
hydronic system provided that the concentration
does not exceed 35% and the antifreeze contains an
anti foamant.
Figure 18. Hydronic Piping EBP/EDP for Systems Zoned with Circulators.
Figure 19. Hydronic Piping EDP for Low-Temp and/or Multi-Temp Systems.
4B. Use in a Combined Hot Water Heating
and Chilled Water Cooling System
When the appliance is used in connection with a
refrigeration system, it must be installed so that the
chilled medium is piped in parallel with the boiler with
appropriate valves to prevent the chilled medium from
entering it.
The boiler piping system of an appliance
connected to heating coils located in air handling units
where they may be exposed to refrigerated air
circulation must be equipped with flow control valves
or other automatic means to prevent gravity circulation
of the boiler water during the cooling cycle.