Technical data

21
5.15 PRESSURE RELIEF VALVE
A Pressure Relief Valve (PRV) is supplied with the system.
The pump group has a dedicated PRV connection point -see fig. 5.15A.
Alternatively the PRV can be fitted to any part of the system using an
appropriate T fitting.
The PRV discharge should be plumbed to a low level and terminated inside
a suitable container to collect any discharged heat transfer fluid. The
discharge and container should be inside the dwelling normally under the
pump group - see figs. 5.1A and 5.15A.
No manual isolation valves are permitted in the pipework to the PRV or in
the PRV discharge pipe.
FIG. 5.15A PRESSURE RELIEF VALVE
Pressure Relief Valve
PRV
Discharge
thgiehmetsyS
)sertem(
gnillifmetsyS
erusserp
)sertem(
lesseVnoisnapxEfoerusserp-erP
lesseVl52lesseVl52
lesseVl52
lesseVl52lesseVl52
dradnatsdradnats
dradnats
dradnatsdradnats
lesseVl53lesseVl53
lesseVl53
lesseVl53lesseVl53
lanoitpolanoitpo
lanoitpo
lanoitpolanoitpo
01ot35.13.13.1
3.1
3.13.14.14.1
4.1
4.14.1
116.14.14.1
4.1
4.14.15.15.1
5.1
5.15.1
217.15.15.1
5.1
5.15.16.16.1
6.1
6.16.1
318.16.16.1
6.1
6.16
.16.16.1
6.1
6.16.1
419.17.17.1
7.1
7.17.17.17.1
7.1
7.17.1
510.28.18.1
8.1
8.18.18.18.1
8.1
8.18.1
The chart below gives the initial pressure charge that the expansion vessel
will require for a given system height (static system head).
The expansion vessel should be charged to this pressure prior to filling
the system.
The factory set pressure of vessels is 2.5 bar.
Note:
The PR valve is factory set at 6bar.