Section 4: Sealed SystemPage 18
All Grant Aerona³ heat pumps must be used with sealed systems complying
with the requirements of BS EN 12828, BS EN 12831 and BS EN 14336.
The system must be provided with the following items:
• Diaphragm expansion vessel complying with BS EN 13831
• Pressure gauge
• Pressure relief (safety) valve
• Approved method for filling the system
Expansion vessel
The expansion vessel can be fitted in either the return or flow pipework in
any of the recommended positions as shown in Figure 4-1. To reduce the
operating temperature of the expansion vessel, position it below the pipe to
which it is connected.
The expansion vessel may be positioned away from the system, providing the
connecting pipe is not less than 13 mm diameter. If the expansion vessel is
connected via a flexible hose, care must be taken to ensure that the hose is
not twisted.
4 SEALED SYSTEMS
Ensure that the expansion vessel used is of
sufficient size for the system volume.
Refer to BS 7074:1:1989 or The Domestic
Heating Design Guide for sizing the required
vessel.
NOTE
17
Table 4-2: Sealed System heating components key
Key Description
1 Expansion vessel
2 Pressure gauge
3 Pressure relief valve
4 Tundish
5 Removable filling loop
6 Double check valve
7 Automatic air vent
8 Thermostatic radiator valve
9 Automatic bypass
10 Flexible hose
11 Isolation valve
12 Volumiser
13 Motorised 2-port valves(CH)
14 Motorised 2-port valves (DHW)
15
Optional additional circulating pump
(refer to Section 8.3.7)
16 Drain point
17 Mag One magnetic filter
Figure 4-1: Sealed System heating components
12
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