Pressure Relief Pipe Work; Boiler Location & Clearances - Worcester 29CDi Classic Installation, Commissioning And Servicing Instructions

PRE-INSTALLATION
3.6

PRESSURE RELIEF PIPE WORK

NOTICE:
▶ The pressure relief valve is a safety device for the
boiler and if activated may discharge boiling water or
steam through the relief valve drain pipe.
▶ Care should be taken when siting the outlet pipe so
that it does not cause an obstruction or discharge
above a window, entrance or other public access
where it could cause a hazard.
• The pressure relief drain pipe (1) from the boiler should be at least
15mm diameter copper pipe and run downwards, away from any
electrical equipment or other hazard, preferably to an external drain
or soak away.
• Pipe (1) should be finished with a partial bend, near the outlet to face
the external wall (as shown) to help prevent freezing.
1
2
3
4
Fig. 18 Pressure relief pipe work
[2] Outside wall
[1, 3] PRV drain pipe
[4] External drain
REMOTE PRESSURE RELIEF VALVE KIT
For installations in a cellar or basement, there is an accessory that is
available from Worcester that allows the pressure relief valve to be fitted
remotely from the boiler. This accessory can be used when there is
difficulty accessing an external drain.
The part number for this kit is: 7 716 161 071
16
1
2
2
3
4
6720646608-123.1Wo
3.7 BOILER LOCATION & CLEARANCES
This boiler is only suitable for installing internally within a property at a
suitable location onto a fixed, rigid surface at least the same size as the
boiler and capable of supporting the boiler weight.
NOTICE:
No surface protection is required against heat transfer
from the boiler
COMPARTMENTS:
Follow the requirements of BS6798 and BS5440 Part 2 and note:
• Minimum clearances must be maintained
• An access door is required to install, service and maintain the boiler
and any ancillary equipment.
• If an airing cupboard is adapted to house a boiler, then the airing
spaces must be separated from the boiler compartment by a non-
combustible partition. The partition may be perforated, if required,
by holes not exceeding 13 mm in diameter.
• If the appliance is fitted into a cupboard or a compartment is built
around the appliance after installation, then the compartment must
be built or lined by a non-combustible material.
BOILER CLEARANCES:
The diagram opposite shows the minimum space required to install and
service the boiler.
VENTILATION
This is a room sealed appliance and does not require any air for
combustion from inside the property.
The requirements of BS 6798 and BS 5440 regarding ventilation do not
apply, with the Greenstar CDi Classic
for ventilation openings to be provided in the compartment because of
the low heat loss from the appliance casing, if the clearances shown are
maintained.
Do not operate the appliance if the flue terminal fitted on the outside wall
or roof is obstructed or damaged.
SERVICING CLEARANCES
960mm
600mm**
5mm
450mm
Fig. 19
* Minimum clearance to removable door
** Minimum clearance required for servicing
*** Height for either 60/100 flue or 80/125 flue
Table 9 Minimum clearances
ErP
Combi boiler. There is no need
20mm*
5mm
200mm
380mm
6 720 815 725 (2015/05)