Antman's Web Pages
DIY installation support for Navitron
Solar Heating Systems
OK - Do you need to know how to wire the
solar components into an existing
central heating system?
Are you installing a complete new system
with solar and want to know how to wire it all up? If so, read on!
I have updated and improved the original wiring schematics file into multiple files.
The new generic System Schematic files offer several improvements over the original versions in that they:
a) Support the boiler 'Pump Over-Run' capability and are suitable for
all boilers using a common-neutral
connection to boiler and pump.
b) Utilise the industry standard terminal box numbers for the
Y-Plan and S-Plan Schemes - an oversight on the original.
*** Please note previous Y-Plan file incorrectly showed V4073 white wire connected to 4PCO relay NO2. It should go to NO3. Thanks to chilled
for pointing this out.
c) Offer multiple tab options to use a bypass radiator permanently
connected to the boiler pump circuit as the Heat Dump or to dump into
the full central heating radiator circuit.
d) Add alternative tabs for the original Resol BS/3 and BS/4 and the Navitron TDC2 and TDC3 solar controllers.
e) All use the same 4-pole changeover relay with standardised
connections across all Wiring Plans. This makes it easier for
installers as you only need one type of relay.
Some schematics have a spare unused pole - this may
be used for future updates....
wiring schemes S-Plan.xls (Microsoft Excel approx. 98KB) for the
NEW S-Plan file.
wiring schemes Y-Plan.xls (Microsoft Excel approx. 92KB) for the
NEW Y-Plan file.
wiring schemes S-PlanPlus.xls (Microsoft Excel approx. 133KB) for the
NEW S-Plan+ file.
PLEASE NOTE: Each file contains multiple Tabs, one for each schematic.
You cannot see all the available options unless you scroll through the
tabs using the arrows in the bottom left of the Excel screen!
These variants should work as they are derived from the
original files. If anyone finds any errors please PM me and I will
correct and update!
Condensing boiler compatibility
There has always been
concern over the complex control electronics of modern condensing boilers making
it difficult or indeed impossible to utlise the domestic central heating
radiator circuit as a Heat Dump if required.
The Alpha CDR and Remeha Avanta ov ranges have both been used by me with the common-neutral schematics.
wiring schemes S-Plan Alpha CDR.xls (Microsoft Excel approx.
84KB) for the S-Plan Alpha CDR boiler system file.
This can also be used on the Avanta - just update the boiler terminal connections accordingly.
I intend to update these files to a set of Universal Schematics ASAP utilising the spare relay pole to isolate the pump neutral.
The process of installing and integrating the Navitron Solar System
into my own existing S-Plan Plus
central heating system is described in my DIY Solar Heating
(Adobe .pdf format 0.96MB - updated June 2008)
The V4073 page
gives details of a simple modification to greatly improve reliability of the Honeywell V4073A synchron motor in Y-Plan systems and can also be applied to V4043H 2-port valves.
Installation manuals for the Resol
range of Solar Controllers can be
downloaded from the Resol
(Note: Select Service
and then Documents
from the menu tabs for the full range)
website at http://www.navitron.org.uk/
for all your Renewable Energy requirements.
You are welcome to PM me (Antman) via the Navitron Forum
However please post general questions in the relevant section of the
Forum so that all members can benefit from the responses.
images of my own installation
|Lower frame mounting
||Insulated end boxes providing
additional protection - note these are not provided as part of the kit
||S4 sensor mounting
|Domestic water pipework with TMVs
||Complete solar, boiler and CH
||Pumps and DHW boiler pipework -
text for explanation of DPV on boiler coil
|Lower pipework - two independent radiator
zones. Two 10mm pipes
in right foreground feed the bathroom radiator direct from boiler
circuit, which now doubles as the
heat dump load when excess solar energy is generated.
||Built-up manual air trap/vent
plant spray for adding anti-freeze - uses additional 3/8" bsp to 15mm
|Relay and wiring terminal connection box
||Two dual zone programmers for system control
|I found this earlier shot which
shows the solar and boiler pipework before lagging. At this stage the 'Slave'
solar relay is not installed since the solar system has not yet been finally filled. But
it does allow the boiler to run and the solar controller to be
programmed and sensors checked.
||And finally - how
much simpler it all was before solar and full Part-L compliance...
Copyright notice and the Legal
Regrettably it is necessary to emphasise the legal terms and conditions for use of the documents on these web pages, since a
minority seem to be taking liberties with this and Navitron documentation.
All images and files are copyright of the author © A.J.Cooper, March 2006 to current date.
Images and files may be
reproduced for personal use and are provided for support of
Navitron Ltd solar system installations and Navitron customers only.
Strictly no editing,
reproduction or publishing for commercial use except by Navitron Ltd, with the following
a) Use of the files in
their entirety to assist and promote the sale and installation of Navitron Ltd
solar systems by a Navitron installer; all references to Navitron and the author must be retained in
b) A copy of customised versions of any wiring file
template used in an installation may be left with the customer by a Navitron
installer to enable compliance with the documentation requirement of the current
The author retains copyright of the master files.
The modification of any image or file to imply endorsement of any company or product other than
that of Navitron Ltd is strictly prohibited.
Information is provided for assistance only. Strictly no liability is accepted by the author or by Navitron
Ltd for errors or omissions. It is the user's responsibility to check that
information provided, and suitability for any installation based on it, conforms
to current Planning, Building and IEE Wiring Regulations.
Last updated 18/12/14