Commissioning; Pre- Commissioning Checks; Filling The System - Bosch Worcester Greenstar CDi Classic System ErP Series Installation, Commissioning And Servicing Instructions

5

COMMISSIONING

5.1

Pre- commissioning checks

CAUTION: MAINS SUPPLIES
▶ Isolate the mains supplies before starting any work
and observe all relevant safety precautions.
1. Check that the service and water pipes are connected to the correct
position on the manifold.
A - CH flow (22mm)
B - CH return (22mm)
C - Gas inlet (22mm)
D - Cylinder outlet (15mm) if the optional diverter valve is used.
E - Cylinder inlet (15mm) if the optional diverter valve is used.
5
C B
A
22mm 22mm 22mm
D
E
15mm 15mm
Fig. 44
2. Check the gas type specified on the identification plate (F) matches
that of the gas supply. Turn on the main gas supply, check the gas
pipe work, connections and rectify any leaks.
2.
F
Fig. 45
6 720 815 724 (2015/11)
A C B
22mm 22mm 22mm
3. Check that the pressure relief connector, located on the right hand
side at the bottom of the wall frame, in its up position.
3.
Stop in
locked
position
Fig. 46
4. Check that the condensate pipe has been connected to the adapter
4.
Fig. 47
NOTICE: If the boiler is not to be commissioned
immediately then: after successfully completing all of
the checks and any rectification work, close the gas and
water valves, shut off the gas supply and electrically
isolate the boiler.
5.2

Filling the system

1. Ensure all system and boiler drain points are closed.
2. For sealed systems fill the system using a WRAS approved filling loop
to a pressure of1 bar.
3. Vent all radiators, retighten when completed and check the system
and correct any leaks.
• The boiler integral expansion vessel is precharged to 0.75bar (equal
to a static head of 7.5meters [22ft]). A Schraeder type valve is fitted
to the expansion vessel to allow for pressure adjustment if required.
• If an extra expansion vessel is fitted to the central heating return,
adjust to the same pressure as the appliance internal expansion
tank, refer to separate instructions with the extra expansion vessel.
4. Briefly open the pressure relief valve to test its operation.
5. Refill the system up to 1 bar.
GAS SUPPLY
▶ Open gas cock on the boiler and purge the gas supply to the boiler
ensuring that the room is well ventilated.
▶ Test gas supply for soundness as described in
BS 6891.
COMMISSIONING
6 720 812 175-12.1O
31