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Pre-Installation
SYSTEM FILL
Heating return
Non return
Hose
return
Stop
cock
Temporary hose
Fig. 9
System fill - category 3
Requirements Fluid Category 4 systems:
• Control valve (stop valve) on the mains cold water supply pipe.
• Strainer.
• Water non-return valve with reduced pressure Zone (RPZ valve
assembly) incorporating a Type BA air gap.
• Tundish.
• Control valve (stop valve) on the heating system pipework.
Stop
Mains
Strainer
cold water
cock
Fig. 10 System fill - category 4
Typical sealed system
1
2
3
Fig. 11 Sealed system
[1]
Expansion vessel - CH return
[2]
Pressure relief discharge
[3]
Drain cock
[4]
Radiators
12
Non return
valve
valve
Mains
supply
Stop cock
Test cock
6720648726-73.1TD
Stop
RPZ
cock
Tundish
6 720 648 726-074.1TD
4
4
4
4
3
1
5
M
2
3
Fig. 12 Sealed system with zone valves
[1]
Expansion vessel - CH return
[2]
Pressure relief discharge
[3]
Drain cock
[4]
Radiators
[5]
Zone valves
3.5
Condensate pipe work
NOTICE:
▶ Where a new or replacement boiler is being installed,
access to an internal "gravity discharge" point should
be one of the factors considered in determining
boiler location.
▶ The condensate pipe must be nominally
22mm Ø plastic pipe.
▶ The condensate pipe work must fall at least 52mm
per metre towards the outlet and should take the
shortest practicable route.
▶ Ensure there are no blockages in the pipe run.
Key to condensate illustrations
1
Condensate discharge from boiler
2
Soil and vent stack
3
Minimum 450mm and up to three storeys
4
Visible air break at plug hole
5
Sink or basin with integrated overflow
6
75mm sink waste trap
7
Condensate pump
8
PVCu strap on fitting
9
100mm Ø minimum plastic pipe
10
Drainage holes
11
Limestone chippings
12
Bottom of sealed tube
13
Insulate and increase pipe size
14
Pipe work transition
15
External air break
16
Air gap
17
External rain water pipe into foul water
18
43mm 90° male/female bend
*
Condensate trap of 75mm already incorporated into the boiler
Table 10
3.5.1
Internal connections
In order to minimise risk of freezing during prolonged cold spells, the
following methods of installing condensate drainage pipe should be
adopted, in order of priority.
4
4
4
4
3
6720814332 (2018/04)
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