Prepare For Operation; Open Vented Heating Systems; Sealed Heating Systems; Checking The System Pressure - Bosch Worcester Greenstar Ri ErP + Series User Instructions

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Prepare for operation

3.1

Open vented heating systems

Appliances that can be connected to open vented heating systems will have the pressure maintained automatically by the header
tank feeding the system.
3.2

Sealed heating systems

Appliances that can be connected to sealed heating systems are pre-pressurised before operation, this pressure must be
maintained for safe use of the appliance.
Your installer will have fitted a pressure gauge and filling loop so that the system can be monitored and adjusted as necessary.
▶ Check regularly that the pressure is maintained.
▶ Re-charge the system if the pressure gauge reads less than 1 bar.
▶ If a permanent significant decrease or increase in pressure is indicated on the pressure gauge, contact your installer or
maintenance engineer.

3.2.1 Checking the system pressure

Your installer will advise you of the optimum operating pressure.
▶ Check the system pressure from the pressure gauge.
– Static pressure is when appliance is cold and has not fired for heating or hot water. This will generally be 1 - 1.5 bar.
– Operating pressure is when the appliance is firing for a heating or hot water demand. This will generally be 1 - 2 bar.
▶ Top up the heating water, if the pressure is too low.
Fig. 2 Pressure gauge for checking the operating pressure
[1] Static pressure range
[2] Operating pressure range

3.2.2 Constantly re-pressuring the system pressure

Constantly having to re-pressuring the heating system should be investigated as the concentration of inhibitor protection in the
system will be reduced; this can result in corrosion within the heating system reducing the efficiency and increasing contaminates.
▶ Check for leaks on heating system (pipe work and radiator valves).
▶ Contact your installer or maintenance engineer if a permanent significant decrease or increase in pressure is indicated on the
pressure gauge.
Greenstar Ri ErP + - 6 720 821 669 (2018/06)
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