Giacomini Mixing Floor Coil Headers Model R557A 
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Giacomini Mixing Floor Coil Headers Model R557A

Mixing Manifolds

Available In 2-12 ports

Mixing Manifold for use to reduce high temperature water (65-85degree C max down to 45-50 Degree C) wet back fires, wood and gas boilers, heat pumps etc, circuits which require blending down to lower, underfloor heating temperature levels*

Kit includes:(comes pre assembled) Pump Auto air eliminator Brackets Flow meters Thermostatic mixing valve

Lockshield valve Pressure gauge Differential by-pass valve Adjustment key Temperature gauge

FEATURES

  • GIACOMINI mixing floor coil headers are of all brass construction and are supplied with thermostatic mixing valve, circulating pump with isolating valves and manual air vents.
  • R557A is fitted with connectors for 20mm O.D. poly circuits.
  • Required for each header is a special end fitting R554D incorporating auto. Air vent, temp gauge and drain cock is available.

Mixing Manifold Operation


The injector valve (4) and the lockshield valve (7) are the connection points to the primary circuit from the heat source. Water from the heat source, at a temperature lower than 90°C, flows through the injector valve (4) and is pumped past the sensor (6) into the upper flow manifold (1), passing through the pipe circuits to the return manifold (2). A large proportion of this water is then re-circulated via the pump (3), past the sensor and back into the flow manifold. If the water temperature at the sensor is greater than the limit set by the thermostatic head (5), the injector valve (4) closes so that the water is re-circulated until it reaches a low enough temperature to re-open the injector valve, allowing in more water.It is this process that maintains the relatively low temperatures required by underfloor heating. The addition of actuator heads to the return manifold allows the temperature of different rooms, or zones, to be controlled by their own individual thermostat or sensor.The differential valve automatically regulates pressure changes within the manifold, allowing for accurate setting of flow rates via the flow meters.For added safety the thermostat with immersion sensor (part of the PM100 wiring centre) should be fitted. This operates in the event of the thermostatic head (5) failing, by shutting down the pump (3), allowing water to pass directly from the injector to the lockshield valve (7) without passing through the circuits.

Mixing Diagram

PDF: download

Mixing Pic

The end fitting R554D is required for each manifold it incorporates the auto airvent, temp gauge and drain cock

Price (each):
R557A - 02, 2 Circuit mixing floor coil header.  $990.00 
R557A - 03, 3 Circuit mixing floor coil header.  $1,100.00 
R557A - 04, 4 Circuit mixing floor coil header.  $1,188.00 
R557A - 05, 5 Circuit mixing floor coil header.  $1,265.00 
R557A - 06, 6 Circuit mixing floor coil header.  $1,353.00 
R557A - 07, 7 Circuit mixing floor coil header.  $1,441.00 
R557A - 08, 8 Circuit mixing floor coil header.  $1,529.00 
R557A - 09, 9 Circuit mixing floor coil header.  $1,606.00 
R557A - 10, 10 Circuit mixing floor coil header.  $1,705.00 
R557A - 11, 11 Circuit mixing floor coil header.  $1,958.00 
R557A - 12, 12 Circuit mixing floor coil header.  $2,024.00 
R554D, End Fitting (Required )  $75.00 

Quantity   for 
Giacomini Mixing Floor Coil Headers