Mill Hill Cottage Plumbing & Heating Ltd

(Previously Heating Innovations)

Home Up H3 diagram H3 system layout H3 system operation

 

Heat leak radiator has circuit at all times -Sometimes gravity and sometimes pumped

Red = Flow  White = Not flowing.

Function 1.

The H3 panel in a natural state with no electric switched on.

Programmer H/W off C/H off

Solid fuel appliance is firing in slumber mode with gravity circuit functioning.

The valves are all naturally open, pipework circuits are free to gravity circulation into the hot water cylinder and the heat leak radiator from the solid fuel appliance when the fire has been lit.

Gravity circulation to

  1.  hot water cylinder. 
  2.  heat leak circuit.

 

 

 Valve Status.

 

Heat Leak Diverter Valve no 1  - Normal position sprung open allowing unrestricted flow to heat leak circuit.

Motorized Valve no 9 -  Normal position sprung open.

Motorized Valve no 10/17 - Normal position sprung open to the Hot Water Cylinder. (closed to the radiators)

 

 

 

Heat leak radiator has circuit at all times -Sometimes gravity and sometimes pumped

Red = Flow  White = Not flowing.
Function 2.  

When the water leaving the solid fuel appliance reaches 58°C, a dry well thermostat (aquastat) will switch to "make on rise" and send a switched live to the H3 panel and the pump will switch on.

The motorised valve 9 is motored closed to shut off the gravity circuit. The heat leak link valve begins to close, taking around 3 minutes to fully shut

For the first three minutes, the new heat leak loop will recycle back through item no.1 into the pump supply pipe and reduce the full pull of the pump on the heating system and very much reduce the sudden pull that is exerted on the open vent which in certain cases could pull a small amount of air down the open vent into the heating system each time the pump is switched on.

Programmer H/W off C/H off

Solid fuel appliance is firing and the flow has reached 58°C, activating the pump.

Room thermostat not applicable at this stage. (Because CH is off.)

Cylinder thermostat is calling. (Still plays a part even if HW is off)

Pumped circulation to

  1.  hot water cylinder. 
  2.  heat leak circuit.

The heat leak loop recycles and gradually reduces to nil over approximately 3 minutes.

 

Valve Status.

Heat Leak Diverter Valve no 1  - begins to close, loop recycles and gradually reduces to nil over approximately 3 minutes.

Motorized Valve no 9 - Motored closed to shut off the Gravity Circuit.

Motorized Valve no 10/17 - Normal position sprung open to the Hot Water Cylinder. (closed to the radiators)

 

Heat leak radiator has circuit at all times -Sometimes gravity and sometimes pumped

Red = Flow  White = Not flowing.
Function 3.  

The solid fuel appliance energy being fully pumped through the H3 panel to serve the hot water cylinder recharge coil, and heat leak circuit.

The heat leak diverter valve is fully shut, the pumped heat leak flow is now diverted through a small bore pipe controlling the flow rate to the heat leak radiator.

Programmer H/W off C/H off

Solid fuel appliance is firing and the flow has reached 58°C, activating the pump.

Room thermostat not applicable at this stage. (Because CH is off.)

Cylinder thermostat is calling. (Still plays a part even if HW is off)

Pumped circulation to

  1.  hot water cylinder. 
  2.  heat leak circuit.

The heat leak loop ceased to recycle.

 
Valve Status.

Heat Leak Diverter Valve no 1  - Electronically closed to shut off the recycling circuit around the heat leak loop.

Motorized Valve no 9 - Motored closed to shut off the Gravity Circuit.

Motorized Valve no 10/17 - Normal position sprung open to the Hot Water Cylinder. (closed to the radiators)

 

Heat leak radiator has circuit at all times -Sometimes gravity and sometimes pumped

Red = Flow  White = Not flowing.
Function 4. 

Pumped Circuit for the Solid Fuel Boiler when in Hot Water and Heating Mode. 

The solid fuel boiler is now producing more energy than the hot water cylinder recharge coil can absorb, the consequential increase in solid fuel flow temperature is detected by a phial connected to the High Limit Thermostat and when the set temperature  is reached motorized Valve no 10/17 is motored to mid position and the heat is diverted to both the hot water cylinder and the radiator system.

The room thermostat, does not prevent above from happening in this scenario because the solid fuel appliance needs to clear the surplus energy.

Programmer H/W off C/H off.

Solid fuel appliance is firing and the flow has reached 58°C, activating the pump.

Room thermostat not applicable at this stage. (Because CH is off.)

Cylinder thermostat is calling. (Still plays a part even if HW is off)

Pumped circulation to

  1.  hot water cylinder. 
  2.  heat leak circuit. 
  3.  radiators

 
Valve Status.

 

Heat Leak Diverter Valve no 1  - Electronically closed to shut off the recycling circuit around the heat leak loop.

Motorized Valve no 9 - Motored closed to shut off the Gravity Circuit.

Motorized Valve no 10/17 - Motored To Mid Position. Open to the Hot Water Cylinder & Radiators.

 

Heat leak radiator has circuit at all times -Sometimes gravity and sometimes pumped

Red = Flow  White = Not flowing.
Function 5.

The solid fuel appliance energy is being fully pumped through the H3 panel to serve the heating system flow to radiators, etc. and the heat leak circuit

When the hot water cylinder reaches optimum temperature (detected by the cylinder thermostat), motorized Valve no 10/17 is motored open to the radiators and closed to the hot water cylinder.

Programmer H/W off C/H off

Solid fuel appliance is firing and the flow has reached 58°C, activating the pump.

Room thermostat not applicable at this stage. (Because CH is off.)

Cylinder thermostat is satisfied. (Still plays a part even if HW is off)

Pumped circulation to 

  1.  heat leak circuit. 
  2.  radiators

 
Valve Status.

 

Heat Leak Diverter Valve no 1  - Electronically closed to shut off the recycling circuit around the heat leak loop.

Motorized Valve no 9 - Motored closed to shut off the Gravity Circuit.

Motorized Valve no 10/17 - Motored open to the radiators. (closed to hot water cylinder)

 

Heat leak radiator has circuit at all times -Sometimes gravity and sometimes pumped

Red = Flow  White = Not flowing.

Contact Mill Cottage Plumbing & Heating Ltd

Technical Support and Sales

Telephone 01354 653854