Primary Piping
Radiant heating system piping should
include a means of regulating the prima-
ry return water. The return water tem-
perature to the appliance should be
maintained at 130ºF or higher. Failure to
prevent low return water temperature to
the appliance could cause premature
failure of the appliance and it’s burner
system resulting in severe personal
injury, death or substantial property
damage.
If the return system temperature is not
maintained above 130ºF, the appliance
will begin high fire rate and shut down
the primary circulator to prevent con-
densation from occuring within the
appliance.
Size the heating system piping and circula-
tor to provide the flow needed for the radiant
system.
To control the zone circulators reference
Figs. 16 or 17, pages 30 & 31.
To ensure adequate flow rate through the
MODULATING DELTA, maintain a
minimum 1 inch diameter on the system
piping connecting the appliance to and
from the primary / secondary connection.
System Piping - Multiple Appliances
Installation
Use a primary / secondary connection to
the space heating piping as shown in Fig.
10 page 21 or other recognized design
methods.
NOTICE
NOTICE
WARNING
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