7
Prepare for operation
Greenstar Utility
ErP
– 6 720 821 750 (2018/04)
3.2.3 Controlling central heating
▶ Set the programmer/timer to the correct time with the
required ON/OFF periods.
▶ Turn the room thermostat to the temperature required.
▶ Set the thermostatic radiator valves to achieve the
required temperature for each room.
3.2.4 Frost protection
▶ Frost thermostats can be wired into the boiler.
▶ Frost protection should be fitted to the system where the
system is most exposed and at risk of freezing.
If there is no hot water or heating, check page 11 for fault
condition guidance
.
4
Prepare for operation
4.1
Open vented heating systems
This appliance can be fitted to an open vented heating system.
Appliances that can be connected to open vented heating
systems will have the pressure maintained automatically by the
header tank feeding the system.
4.2
Sealed heating systems
This appliance can be fitted to a sealed heating system which is
pressurised. 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.
4.2.1 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. 4
Pressure gauge for checking the operating pressure
[1] Static pressure range
[2] Operating pressure range
4.2.2 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.
6720821669-01.1W
o
1
2
Min
Max
