Worcester GB162-65 Installation And Servicing Instruction page 48

COMMISSIONING
Filling and refilling of the heating circuit must have been
carried out by a method that has been approved by the
Water Regulation Advisory Scheme (WRAS), for the type
of heating appliances, i.e. Domestic (in-house) Fluid
Category 3. Non-Domestic (other than in-house) Fluid
Category 4. Depending on the Fluid Category the
approved method should comprise of the following:
REQUIREMENTS FLUID CATEGORY 3 SYSTEMS
• Control valve (stop valve) including a double check
valve on the mains cold water supply pipe.
• Temporary connection to be removed after filling
(filling loop).
• Control valve (stop valve) on the heating system
pipework.
Fig. 73 System fill - category 3
REQUIREMENTS FLUID CATEGORY 4 SYSTEMS
• Control valve (stop valve) on the mains cold water
supply pipe.
• Strainer.
• Water non return valve with reduced pressure Zone
(RPZ valve assembly) incorporating a Type BA air gap.
• Tundish.
• Control valve (stop valve) on the heating system
pipework.
Stop
Mains
Strainer
cock
cold water
Fig. 74 System fill - category 4
48
6 720 648 726-073.1TD
Stop
RPZ
cock
Tundish
6 720 648 726-074.1TD
B Open the heating flow and return isolating valves on
the pump group (open position: parallel to the pipe).
Fig. 75 Opening the isolating valves (here: open position)
B Read the pressure from the pressure gauge on the
pump group or on the control panel of the BC10.
The pressure in the heating system, which is measured
directly at the boiler, must be at least equal to the
required pre-pressure of the expansion vessel plus
0.5 bar. This minimum pressure must not be less than
1.0 bar (if the heating system is cold). The maximum
pressure in the heating system, measured directly at the
boiler, must not exceed 3.5 bar.
Fig. 76 Reading the pressure gauge
6 720 648 726 (2011/07)
6 720 648 726-075.1TD
P1 0
1
6 720 648 726-076.1TD