Mill Hill Cottage Plumbing & Heating Ltd

(Previously Heating Innovations)
Home Up Auto boiler only Heat pump only Normal Running

 

Normal running mode

On the H7 control box  the heat pump is switched on and automatic boiler boost is switched to:

  1. BOOST HOT WATER ONLY - only function 1 below applies.
  2. BOOST CENTRAL HEATING & HOT WATER - functions 1 to 3 apply.

When fitted, heat leak radiator has circuit at all times

When the boost is used, the flow from a heat pump is passed through into the return of the automatic boiler to be boosted to a higher temperature.

 

 

Function 1.   

Hot water mode on and cylinder thermostat is calling,

Heating mode off, or room thermostat is satisfied

Heat pump and automatic boiler are running, charging the hot water cylinder.

 

 

Status.

Motorized Valve no 8 - Naturally Open to the automatic boiler. (closed to the heat pump)
Motorized Valve no 10/17 - Naturally Open to the hot water cylinder. (closed to the radiators)
Motorized Valve no 22 - Naturally Open to the heat pump.

 

 

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

Function 2.  

Hot water mode on and cylinder thermostat is calling,

Heating mode on and room thermostat is calling

As above in function 1, heat pump and automatic boiler are running, but in hot water and heating mode motorized Valve no 10/17 is motored to mid position and the heat is diverted to both the hot water cylinder and the radiator/U.F.H. system.

 

Status.

 

Motorized Valve no 8 - Naturally Open to the heat pump. (closed to the automatic boiler)
Motorized Valve no 10/17 Motored to mid position. open to the hot water cylinder & radiators/U.F.H.
Motorized Valve no 22 - Naturally Open to the heat pump.

 

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

Function 3.  

Hot water mode on and cylinder thermostat is satisfied

Heating mode on and room thermostat is calling

Heat pump and automatic boiler are running, when the hot water cylinder reaches optimum temperature (detected by the cylinder thermostat), motorized Valve no 10/17 is motored open to the radiators/U.F.H. and closed to the hot water cylinder.

 

Status.

Motorized Valve no 8 - Naturally Open to the heat pump. (closed to the automatic boiler)
Motorized Valve no 10/17 Motored open to the radiators/U.F.H. & closed to the hot water cylinder
Motorized Valve no 22 - Naturally Open to the heat pump.

 

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

Contact Mill Cottage Plumbing & Heating Ltd

Technical Support and Sales

Telephone 01354 653854