Pressure Relief Pipe Work; Boiler Location And Clearances; Installation; Installation And Servicing Clearances - Worcester Greenstar 25Si Compact Installation, Commissioning And Servicing Instructions

4.5

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.
• The pressure relief drain pipe (1) should be finished with a partial
bend, near the outlet to face the external wall (as shown) to help
prevent freezing.
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2
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4
Fig. 12 Pressure relief pipe work
[2] Outside wall
[1, 3] PRV drain pipe
[4] External drain
Greenstar Si Compact ErP - 6 720 813 278 (2015/07)
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2
2
3
4
6720646608-123.1Wo
4.6

Boiler location and clearances

4.6.1

Installation

This appliance 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
appliance and capable of supporting the appliance weight.
No surface protection is required against heat transfer
from the appliance.
The appliance must be installed where:
• An engineer can gain clear and safe access to work on the product or
component, including making adequate provision for visual
inspection of flues in voids.
• The homeowner can gain clear and safe access to the controls,
check, top up or reset the appliance.
• Products in loft cavities must have permanent fixed lighting, a
permanent fixed retractable ladder and a fixed floor area sufficient to
allow access for normal use and servicing directly under and around
the product and between and the access hatch.

4.6.2 INSTALLATION AND SERVICING CLEARANCES

880mm
600mm**
5mm
400mm
Fig. 13 Unventilated compartment
[*] Minimum clearance to removable door
[**] Minimum clearance required for servicing
[***] Height for either 60/100 flue or 80/125 flue

4.6.3 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 fitting the boiler into an airing cupboard use a non-combustible
material to separate the boiler from the airing space.
The material can be perforated up to a maximum hole size of 13mm.
PRE-INSTALLATION
170/210mm***
20mm*
5mm
200mm
300mm
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