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Green Storage WB Range
Installation & Maintenance Instructions
GREENSTAR GAS-FIRED SYSTEM BOILERS USING AN OPTIONAL
INTERNAL DIVERTER VALVE
DESIGN AND SPECIFICATION CONSIDERATIONS WHEN USING
THE OPTIONAL INTEGRAL DIVERTER VALVE
APPROACH:
When designing a heating system incorporating a Greenstar system boiler, the
following needs to be taken into consideration:
• If you are going to use integral boiler controls then you will need to specify the
Integral Diverter Valve Kit every time.
• If you wish to use the Integral Diverter Valve Kit then you can only use the
integral boiler controls.
• Ensure it is possible to fit the domestic hot water (NTC) sensor into a suitable
pocket in the cylinder.
• Ensure you have made yourself familiar with the wiring and pipe work required
prior to quoting.
The following information will assist you in selecting the most appropriate option.
WHY USE THE INTEGRAL DIVERTER VALVE?
• The Integral Diverter Valve Kit can replace the more common Y-plan and S-plan
type systems. Multi-zone systems can still be accommodated by using a 2 port
motorized valve for each central heating zone in addition to the integral diverter
valve kit. The integral diverter valve kit should still be used as this controls the
primary flow to either the central heating or domestic hot water cylinder coil
circuits.
Consideration must be given when quoting to ensure the additional cylinder flow &
return pipework that must be connected directly to the Greenstar system boiler's
pre-plumbing manifold is provided for.
Compatible Control
External proprietary 230v manufacturer's
controls pack
Comfort+ twin-channel programmer &
proprietary room thermostat
Comfort + twin-channel programmer & Sense
I intelligent room thermostat
Comfort+ I RF facia programmer and
RF thermostat
Comfort + II RF twin-channel programmable
RF thermostat
Bosch EasyControl smart thermostat
Sense II weather compensation system
controller
12
1. The Integral Diverter Valve Kit is supplied with a domestic hot water (NTC) sensor
that must be used to monitor the domestic hot water cylinder's temperature.
This requires the placing of the 8mm diameter sensor into the pocket. This sensor
replaces the traditional cylinder thermostat and must be connected to the Greenstar
system boiler's printed circuit board. You must refer to the installation literature of
the appropriate boiler and Integral Diverter Valve Kit for further guidance.
To avoid the risk of inductive electrical interference, 100mm clearance must
be provided between the domestic hot water (NTC) sensor's cable and other
cables conducting 230V or 400V
2. This wiring method does not require the installation of a two port motorised.
Providing the wiring diagram is followed correctly by a competent person, protection
of the cylinder from excessive storage temperatures will be assured and will ensure
compliance with Building Regulation Part G3. This is equal to the accepted common
practice of a 2-port motorised valve installed in the primary flow pipe to the cylinder
and wired to the dual-thermostat.
Note: the Green Storage WB Range Cylinder series of unvented stainless
steel indirect and twin coil cylinders are suitable for this application.
3. The wiring of the dual-thermostat supplied with the cylinder will need amending as
per the diagram.
High limit thermostat (85°C)
The high limit thermostat should be electrically separated from the control thermostat
of the dual- thermostat and wired as shown to ensure that in the event of an overheat
situation within the cylinder, the permanent live electrical supply to the boiler is
interrupted ensuring a safe installation and compliance with Building Regulation Part
G3. See wiring diagrams on page 13.
Provision of cabling within the property must be allowed for connecting the high limit
thermostat to the permanent live supply of the Greenstar system boiler according
to each individual installation's characteristics during planning and at the time of
installation.
Control thermostat (45°-65°C)
The hot water thermostat of the cylinder dual- thermostat will become redundant as
the domestic hot water temperature is monitored by the domestic hot water (NTC)
sensor (see page 13) and set by the domestic hot water control functionality located
within the facia of the Greenstar system boiler.
4. Further information on wiring of systems in conjunction with Worcester appliances
is available in the Gas Boiler Wiring Guide (part number 6 720 649 965) available to
download from www.worcester-bosch.co.uk.
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