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Primary Piping
System Piping - Radiant Heating with Mixing
Va l v e
Connect the PERFORMANCE PLUS to the
system piping as shown with a radiant sys-
tem using a thermostatic mixing valve as
shown in Fig. 14 page 25. The primary / sec-
ondary piping ensures sufficient return tem-
perature to the PERFORMANCE PLUS.
If the radiant system tubing contains no
oxygen barrier, a stainless steel heat
e x c h a n g e r must be used. Failure to
install a heat exchanger could lead to
premature failure of the outer tank and
void any warranty claim.
Radiant heating system piping should
include a means of regulating the boiler
return water. The return water tempera-
ture to the unit should be maintained at
130ºF or higher. Failure to prevent low
return water temperature to the unit
could cause premature failure of the unit
and it’s burner system resulting in severe
personal injury, death or s u b s t a n t i a l
property damage.
Size the system piping and circulator to pro-
vide the flow needed for the radiant system.
To control the zone circulators reference
Figure 34, page 45.
To ensure adequate flow rate through
the PERFORMANCE PLUS, maintain a
minimum 1 inch diameter on the system
piping connecting the unit to and from
the primary / secondary connection.
System Piping - Multiple Units Installation
Use a balance manifold system as the pri-
mary / secondary connection to the space
heating piping as shown in Fig. 16 page 26.
Refer to Fig. 11 page 23 to install air elim-
ination and expansion tank.
For the space heating piping refer to the
applications mentioned in this manual or
use recognized design methods.
NOTICE
WARNING
NOTICE