Glow-worm Clearly Solar Cylinders - Manual (Page 20)

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INSTALLATION
If you are using the cylinder with a gasfired boiler as per GB
standards, you may have to install a suitable heating pump in the
reheating circuit.
9.4.1 Installing the 2-way motorised valve
1
The 2-way motorised valve prevents the cylinder from
overheating.
Install the 2-way motorised valve (1) supplied with the cylinder in
the supply line of the gas-fired boiler. Do not install the valve with
the head upside down.
9.5 Installing hot water pipes
Connect the hot water piping to the 22 mm hot water connection
of the cylinder.
Lay the 22 mm piping up to the first T-piece.
The required diameter of subsequent pipes depends on the
system design.
9.5.1 Connecting up the secondary circulation line
The cylinder has a connection with a 15 mm diameter for a
circulation line.
• Connect a WRAS-approved circulation pump which has a non-
return valve with the circulation connection.
• Establish the connection to the circulation line.
If you are not using the secondary circulation
connection, you must ensure that it is properly closed
off. Where secondary return circuits are used, an
additional expansion vessel may be required.
1
AB
B
A
Key:
1 Thermostat mixer
a Hot water
b Cold water
ab Mixed water
In a thermal solar system, a hot water thermostat mixer must
be installed as scald protection. The hot water thermostat mixer
mixes the hot water from the cylinder with cold water to produce
water with a maximum temperature of between 30 and 60 ºC as
required.
The hot water thermostat mixer must be provided by the installer.
9.5.2 Installing the hot water thermostat mixer (with
secondary circulation line)
230
2
7
10
1
1 6 5
9
3
4
8
Key:
1 Non-return valve
2 Hot water thermostat mixer
3 solar controller
4 Hot water pipe
5 Circulation line
6 Circulation pump
7 Contact thermostat
8 expansion relief valve
9 Cold water pipe
10 solar cylinder
Where possible, avoid installing a circulation line, since a
circulation line results in higher energy consumption.
If the installation of a circulation line is required, keep circulation
operations to a minimum by only using circulation mode when
required for demand and temperature reasons.
Connect the circulation line (6) to the hot water pipe (4) via a hot
water thermostat mixer (2).
9.6 Installation of cold water pipe
The efficiency of an unvented cylinder depends on the available
pressure in the cold water pipe and the flow rate. To obtain
maximum cylinder efficiency, there must be a suitable cold water
pipe, i.e. the measured static line pressure must be at least 2.0
bar. A corresponding flow rate of at least 20 - 25 l/min must be
available.
The pressure in the cold water pipe will be reduced
at times of high consumption. Thus, measurements
should be taken at such times.
The cylinder still works satisfactorily with a pressure below 2 bar
but the flow rate is reduced. If the pressure is below 1 bar, you
should not install an unvented cylinder.
Glow-worm can provide information on alternative hot water
supply systems.