Pre-Plumbing Boiler Connections - Worcester 27i System Compact Installation, Commissioning And Servicing Instructions

INSTALLATION
Refer to Figure 26. The connector (1) in the wiring
harness is for use on other appliances and does not
provide a function on this Greenstar iSystem Compact
Fig. 26 Unused connector
▶ Remove any packaging within the boiler and the packaging base (3).
▶ Leave the V shaped support (5) in place until the boiler is ready to be
hung on the wall frame, then remove.
4.4

PRE-PLUMBING BOILER CONNECTIONS

CAUTION:
▶ Isolate the mains gas supply before starting any work
and observe all relevant safety precautions.
▶ Be aware of plastic components when using a naked
flame on pipework.
GAS AND WATER CONNECTIONS
WARNING: Bonded washer for gas
▶ The bonded washer must be used on the gas pipe
isolating valve connection.
▶ Connect the system pipes using the compression nuts and olives
supplied in the Literature/Hardware pack.
1. CH flow (22mm)
2. Gas inlet - bonded washer (22mm)
3. CH return (22mm)
▶ Fit sealing washers to service valves before hanging boiler.
1.
2.
Fig. 27 Sealing washers
PLUMBING THE CONDENSATE DRAIN PIPE
▶ Fit the condensate discharge pipe as far back as possible to the wall to
ensure easy fitting of the boiler bottom panel.
▶ Route the condensate pipe to an appropriate discharge point, refer to
section 3.4.
▶ Plumb up to the wall frame with 22mm pipe.
▶ Ensure that there is enough pipe to insert 25mm into the rubber hose
connector.
▶ Attach the connector to the condensate drain pipe.
22
1
3.
25mm
Fig. 28 Condensate connection
PRV PRE-PLUMBING CONNECTION
1. Fit the PRV pre-plumbing connector to the PRV locator bracket as
shown in the figure below.
The elbow is supplied in the Hardware/Literature pack.
1.
Fig. 29 PRV pipe connection
Once the wall frame has been mounted the PRV discharge pipe can be
fitted.
Fig. 30 PRV elbow fitting
▶ Connect the PRV discharge pipe to the pre-plumbing connector.
▶ The discharge pipe can be routed as described in section 3.5.
▶ The pre-plumbing connector must be removed before the boiler is
hung on the wall frame.
Greenstar i System Compact - 6 720 807 726 (2013/05)
6720646608-111.2Wo
6720646608-125.1Wo