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14
*
1
7
Fig. 19 Condensate pump to external disposal
[1]
Condensate discharge from boiler
[7]
Condensate pump
[13] Insulate and increase pipe size
[14] Pipe work transition
[*]
Condensate trap of 75mm already incorporated into the boiler
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 the same
diameter as the outlet of the safety valve, copper pipe, and run
downwards, away from any electrical equipment or other hazard,
preferably to an external drain or soak away.
• In domestic installations 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.
• In commercial installations an internal drain in the plant room can be
used for both the pressure relief and condensate discharge.
6720814332 (2018/04)
13
25mm min.
6720813171-18.1TD
Fig. 20 Pressure relief pipe work
[1]
[2]
[3]
[4]
Combined PRV and condensate
The PRV and condensate discharge can be combined by the installer on
the 50kW and 65kW models only according to BS 6798. However, care
must be taken to ensure that an air gap is present between the PRV
discharge pipe and the connection to the condensate discharge pipe.
This is to guard against any potential blockage of the PRV, for example,
frozen condensate.
If the system pressure exceeds the maximum pressure this will result in
the volume of water being discharged through the PRV to be greater than
the storage capacity of condensate pumps.
DO NOT fit a condensate pump when combining the PRV and
condensate.
1
2
3
4
6720643895-08.1Wo
Drain pipe
Outside wall
Drain pipe
External drain
Pre-Installation
15
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