Installing The Differential Pressure; Controller; Installing The Isolating Valves; Installing The Drain Cock - Worcester GB162-65 Installation And Servicing Instruction

INSTALLATION
B Connect the return pipe with a flat rubber seal
installed to the CHR ( CH boiler return) connection
[2] making sure it is not under stress. Use a return
pipe with a minimum diameter of 1½".
2
1
8
6
9
3 5
3
7
Fig. 15 Connecting the boiler flow and return
1 CH boiler flow
2 CH boiler return
3 Isolating valves
4 Drain cock
5 Gas valve
6 Pressure relief valve
7 Condensate trap
8 Pump
9 Non-return valve
10 Dirt filter
8.2.4

INSTALLING THE DIFFERENTIAL PRESSURE

CONTROLLER

In situations where there is no low loss header, installing
a bypass with a differential pressure controller would
not be required.
If a low loss header is present, it may be required -
depending on the situation - to install a bypass with a
differential pressure controller to the secondary side of
the low loss header. This serves to protect the
secondary pump against overheating as a result of
insufficient flow.
8.2.5

INSTALLING THE ISOLATING VALVES

B Install a isolating valve for maintenance and repair
purposes in both the boiler flow and return circuits
( fig. 15, [3]). Use isolating valves with a minimum
diameter of 1½".
8.2.6

INSTALLING THE DRAIN COCK

B Connect a drain cock in the return circuit (
[4]).
22
4
10
3 3
6 720 648 726-015.1TD
fig. 15,
8.2.7

INSTALLING A PRESSURE RELIEF VALVE

CAUTION: Damage to the installation.
To prevent the pressure in the heating
system from becoming excessively high, a
pressure relief valve is required.
B Install a 4-bar pressure relief valve (
with a minimum passage of 22 mm in the flow circuit.
Make sure that the pressure relief valve is always
installed between the boiler and the isolating valve,
so that the boiler will always be in contact with the
pressure relief valve, even if the isolating valves are
closed.
8.2.8

SELECTING AND INSTALLING THE PUMP

B Select a pump according to the hydraulic boiler
resistance specified in table 5 or in the curve in
fig. 123 on page 85.
B When using the curve take the nominal required
volume flow into consideration according to table 3.
B When selecting the pump, take the maximum volume
flow of the boiler according to table 4 into
consideration.
Select a pump with a residual head of at
least 200 mbar at the minimum required
volume flow (
GB162-65 GB162-80
3,000
Table 3 Nominal required volume flow [l/h] at
GB162-65 GB162-80
5,000
Table 4 Maximum volume flow [l/h] at
GB162-65 GB162-80
170
Table 5 Resistance over the boiler at the nominal
required volume flow [mbar]
B Install the pump ( fig. 15, [8]) in the return circuit
( fig. 15, [2]).
6 720 648 726 (2011/07)
fig. 15, [6])
table 4).
GB162-100
3,600 4,300
Δ
T = 20 K
GB162-100
5,000 5,000
Δ T = 20 K
GB162-100
225 320