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CONGRATULATIONS!
You are now the fortunate owner of a MixiMizer
TM
PUMP. It has been carefully inspected and tested
before shipment. It should give you long, efficient,
trouble-free service. For maximum performance and
reliability, please follow the simple instructions in this
manual.
Since mixing by a variable speed injection pump is a
relatively new concept, there are a few simple piping
details that should be considered.
Variable speed injection systems require complete
isolation between the boiler loop and system loop. For
example, when the injection pump is turned off, there
must be no heat transfer from the boiler loop to the
system loop. In order to avoid this unwanted heat
transfer, standard primary-secondary piping tech-
niques are used.
This piping arrangement requires that the injection
piping be at least one pipe diameter smaller than the
piping of the boiler and system loops.
Note 1:
There must be a maximum of 4 pipe diameters
between the tees in the boiler and system loops in
order to prevent ghosts flow when the variable speed
injection pump is off and either the boiler pump or
system pump is on.
Note 2:
There must be at least 6 pipe diameters of straight
pipe on either side of the tees in order to prevent
momentum of water in the boiler and system loops
from pushing flow through the injection loop.
System
Loop
Balancing
Valve
Grundfos
MixiMizer Pump
Note 1
Note 2
Boiler
Loop
}
}
Note 2
}
Figure A - Injection loop without thermal trap.
Balancing
Valve
Note 2
Note 1
Note 2
Grundfos
MixiMizer Pump
