Rotating The Pressure Relief Valve - Worcester GB162-50 Installation Instructions Manual

CHF
CDO
1
2
3
Fig. 9 Installing the isolating valves
[1] Pressure relief valve
[2] Isolating valve, red
[3] Flow connection
[4] Screw fitting 1" female thread (accessory)
[5] Pump
[6] Isolating valve, blue
[7] Return connection
boiler pump
UPS 25-80
GB162-50
UPER 25-80
UPS 25-80
GB162-65
UPER 25-80
UPS 25-80
GB162-80
UPER 25-80
UPS 25-80
GB162-100
UPER 25-80
Table 4 Residual head downstream of pump group with a single-boiler
Δ
system ( T = 20 K)
1) Switch required
▶ Install a shut-off valve for filter cleaning immediately upstream and
downstream of the dirt filter.
When using plastic pipework in the heating system, e.g.
for underfloor heating, it has to be oxygen diffusion tight.
If this pipework does not comply with the relevant
standards, a heat exchanger must be integrated to
separate the systems.
6720813174 (2014/09)
CHR
5
6
7
4
6 720 648 721-005.1TD
with minimum
non residual required
return head volume flow
valve [mbar] [l/h]
1)
with 2,200
without 550 2,200
1)
with 2,200
without 550 2,200
1)
with 3,000
without 375 3,000
1)
with 3,000
without 375 3,000
with 153 3,600
without 259 3,600
1)
with 3,600
without 219 3,600
1)
with 4,300
1)
without 4,300
1)
with 4,300
1)
without 4,300
Installing the differential pressure controller
In situations where there is no low less header, installing a by-pass valve
with a differential pressure controller would be required.
If a low less header is present, it may be required -depending on the
situation - to install a differential pressure controller to the secondary
side of the open manifold. This serves to protect the secondary pump
against overheating as a result of insufficient flow.
Installing the drain cock
Since the isolating valve for the return circuit already has an integrated
filling and drain valve, fitting a drain valve is not necessary.
Installing the non-return valve
Since the isolating valve for the return circuit (blue) already has an
integrated non-return valve, fitting a non-return valve in the return circuit
is not necessary.
5.5

Rotating the pressure relief valve

To prevent the pressure in the heating system from
becoming excessively high, a pressure relief valve is
required.
A 4-bar pressure relief valve forms part of the pump
group [1].
▶ Remove the retaining pin from the pressure relief valve body
(step 1).
▶ Rotate the valve body (step 2).
Fig. 10 Removing the retaining pin
Installation
6 720 648 721-006.1TD
7