Fitting The Appliance/Boiler Connections - Bosch Worcester Greenstar CDi Classic System ErP Series Installation, Commissioning And Servicing Instructions

INSTALLATION
4.4

Fitting the appliance/boiler connections

CAUTION: Isolate the mains gas supply before starting
any work and observe all relevant safety precautions.
GAS AND WATER CONNECTIONS:
▶ System pipes may be run vertically upwards behind the boiler or
below it. See Plumbing Manifold Section on page 16.
A - CH flow (22 mm)
B - CH return (22 mm)
C - Gas inlet (22 mm)
If optional diverter valve is to be fitted:
D - Cylinder flow (15 mm)
E - Cylinder return (15 mm)
▶ Fit sealing washers to service valves before hanging boiler.
▶ Remove dust caps from connections on boiler.
15mm 15mm
22mm 22mm 22mm
A
D
C
E
B
Fig. 28 Sealing washers
The accessibility to the preplumbing manifold can be
improved by removing the condensate trap (see also
page 41).
NOTICE: Before hanging the boiler on the wall mounting
plate ensure the pressure relief valve connection is in
the DOWN position. This is located on the right hand
side of the wall frame at the rear.
▶ The pressure relief connector must be repositioned
after the boiler has been correctly mounted to the
wall plate.
Refer to action step 5.
1. Pull the extended tab/lever forward and down until there is no further
travel.
2. Hang the boiler on to the hanging bracket. The lugs pass through the
rectangular holes in the boiler back panel.
Take care not to disturb the washers on the connections.
It is recommended that this lifting operation is carried
out by 2 people, observing all precautions for the safe
lifting of heavy objects.
Do not lift by the top case panel. There are two handling
holes incorporated into the inner casing left and right in
the lower section of the appliance.
24
22mm 22mm
22mm
A
C
B
6 720 812 175-32.1O
Do not lift by the
top case panel.
Handling
hole
3.
1.
Fig. 29
3. Lower the control panel into the service position by squeezing the
white plastic clip and then pulling the clip down.
4. Make connections to the heating system.
▶ Connect the gas supply to the boiler gas cock 22mm compression.
▶ If the optional diverter valve is to be fitted:
Connect cylinder flow and return.
5
C B
A
22mm 22mm
22mm
D
E
15mm 15mm
Fig. 30 Boiler connections
NOTICE: The pressure relief connector must be
repositioned after the boiler has been correctly mounted
to the wall mounting plate.
5. Push the lever on the pressure relief connector UP until the stop on
the inside of the handle is over the shoulder of the metal bracket to
secure in place.
2.
4.
5.
6 720 815 724-09.1O
A C B
22mm 22mm 22mm
6 720 815 724 (2015/11)