51
3061490_0709
Design information
Direct connection of a mixer circuit via injection control
Applications
The injection control will be used if a mixer circuit with
pump is to be directly connected (i.e. without low loss
header) to a CGB-35/50. The injection control offers
many benefits compared with a conventional dual shunt
pump control.
Description
The injection control includes an open bypass between
the flow and return in the mixer circuit, which separates
the mixer circuit pump from the boiler circuit.
The mixer, equipped with a dummy plug, controls the
mass flow which is injected into the mixer circuit subject
to the flow temperature.
Benefits of injection control when compared to shunt
pump control:
- A hydraulic separation is provided, thereby preven
-
ting the boiler pump and the mixer circuit pump from
affecting each other.
- The hydraulic balance is substantially easier to achie
-
ve, since every consumer circuit requires only one
reducer.
- The pump rate in the mixer circuit is reduced, because
the mixer pressure drop must be added to the boiler
circuit.
- The mixer circuit pump will be switched OFF if, for an
underfloor heating system, an excess temperature
occurs in the mixer circuit flow. No additional solenoid
valve (like those required for dual shunt pump circuits)
is required for interrupting the mixer circuit supply.
Switching OFF the boiler pump is also no longer
required.
Vital installation requirements:
- Insert a dummy plug into the three-way mixer (see
diagram).
- Size the mixer circuit pipework correctly (see table).
- Match up the mixer circuit and possibly any existing
consumer circuits (see diagram) with reducers, the
-
reby preventing supply shortages for the individual
consumers.
Summary of Contents for CGB-35
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