20
F
IG
. 5.13
A
P
IPE
R
EDUCERS
5.13 P
IPE
R
EDUCERS
Ø22mm Pipe
Ø15mm Pipe
The basic pipe size for the system is either Ø22mm or Ø15mm -
see section 5.5.
The collectors connections and three of the four pump group
connections are supplied for Ø22mm pipe. The flow limiter has a
Ø15mm connection. Compression fittings Ø22 to Ø15 will need
to be fitted as required to suit system pipe size.
5.14 E
XPANSION
V
ESSEL
Both two and three collector systems are supplied with a 25l expansion
vessel.
A 35l expansion vessel is available as an optional extra, code: 12002737.
A flexible connection pipe is supplied for connection of the expansion vessel.
The pump group has a dedicated expansion vessel connection point -see
fig. 5.14A.
Alternatively the expansion vessel can be fitted using a T fitting to the
return pipework to the collectors, preferably close to the pump. Expansion
vessels must not be fitted to the flow pipework owing to potential high
temperatures.
No manual isolation valves are permitted in the pipework to the expansion
vessel.
F
IG
. 5.14
A
E
XPANSION
V
ESSEL
C
ONNECTION
P
OINTS
Expansion Vessel
Connection
Note:
Owing to high differentials in
temperature within the solar
circuit and the use of water/glycol
mixture, expansion vessels are
larger than comparable heating
systems.
Flow
Return
