Mill Hill Cottage Plumbing & Heating Ltd

(Previously Heating Innovations)
Home Up solid fuel boiler only automatic boiler only link up operation

 
Solid Fuel - Running the system with only the solid fuel boiler working.

 

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

Function 1.  

The H2 panel in a natural state with no electric switched on.

Programmer H/W off C/H off

Automatic boiler is off and cold.

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 from the solid fuel appliance when the fire has been lit. The return circulation goes back into the common return, and back down to the solid fuel appliance. 

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 22 - Normal position sprung open allowing gravity circuit to Solid Fuel Boiler via common return.
Motorized Valve no 8 - Normal position sprung open to the Solid Fuel Boiler. (closed to the automatic Boiler)
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)

 

 

Red = Flow. Blue = Return. Orange = Preheated Return. 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 H2 panel and the pump will switch on.

The motorised valves 22 & 9 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

Automatic boiler is off and cold.

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)

Bias thermostat temperature not reached (Adjustable between 60° and 70°C)

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 22 - Motored closed to shut gravity circuit and prevent link up mode.
Motorized Valve no 8 - Normal position sprung open to the Solid Fuel Boiler. (closed to the automatic Boiler)
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)

 

Red = Flow. Blue = Return. Orange = Preheated Return. White = Not flowing.

 
 

Function 3.  

The solid fuel appliance energy being fully pumped through the H2 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

Automatic boiler is off and cold.

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)

Bias thermostat temperature not reached (Adjustable between 60° and 70°C)

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 22 - Motored closed to shut gravity circuit and prevent link up mode.
Motorized Valve no 8 - Normal position sprung open to the Solid Fuel Boiler. (closed to the automatic Boiler)
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)

 

Red = Flow. Blue = Return. Orange = Preheated Return. 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 Bais thermostat and when the set temperature (Adjustable between 60° and 70°C) 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

Automatic boiler is off and cold.

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)

Bias thermostat temperature reached (Adjustable between 60° and 70°C)

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 22 - Motored closed to shut gravity circuit and prevent link up mode.
Motorized Valve no 8 - Normal position sprung open to the Solid Fuel Boiler. (closed to the automatic Boiler)
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.

 

Red = Flow. Blue = Return. Orange = Preheated Return. White = Not flowing.

 
Function 5. 

The solid fuel appliance energy is being fully pumped through the H2 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

Automatic boiler is off and cold.

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)

Bias thermostat temperature reached (Adjustable between 60° and 70°C)

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 22 - Motored closed to shut gravity circuit and prevent link up mode.
Motorized Valve no 8 - Normal position sprung open to the Solid Fuel Boiler. (closed to the automatic Boiler)
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)

 

Red = Flow. Blue = Return. Orange = Preheated Return. White = Not flowing.

 

Contact Mill Cottage Plumbing & Heating Ltd

Technical Support and Sales

Telephone 01354 653854