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Clearly SolarTechnical Guide
Glow-worm
Nottingham Road
Belper
Derbyshire
DE56 1JT
www.glow-worm.co.uk
Head Offi ce:
01773 824 639
Literature:
01773 596 105
Aft er Sales Service:
01773 596 510
Technical Advice:
01773 828 300(Boiler)
08447 361 143(Renewables)
Training:
01773 596 156
www.glow-worm.co.uk
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ContentsContents
Clearly Solar 4-5
Solar system selector guide 6-9
System sizing
Specifi c system sizing calculations 10-12
Straightforward ordering
Installer step 1 13-15
Developer step 1 16
Developer and Installer step 2 & 3 17
Specifi cations 18
Dimensions
Clearly Solar flat plate collector 19
Flurocyl2 solar hot water cylinders 20
Thermal stratifi cation of Clearly Solar twin coil cylinder 21
Dimensions
Clearly Solar controller and pump station 22
Collector siting options 23
Arrangement, fi xings and clearances
On roof brackets 24
In roof 25-27
Disclaimer
This Technical Guide is intended as a guide only, and should not be used as an
alternative to the manufacturers instructions provided at purchase. The information
in this guide was correct at the time of going to print. Glow-worm reserve the right
to make any modifi cations to product specifi cations, or any other details, without
prior notifi cation. For further clarifi cation, please enquire in writing to the head offi ce
address on the reverse of this brochure.
A-frame 28
A-frame dimensions & In roof expansion vessel guide 29
Wiring
Clearly Solar controller DHW programme 30
Wiring table 32-33
Solar control, thermal block, third party 34-39
Solar control, Smart Wiring Centre, Wired 40-41
Solar control, Smart Wiring Centre, Wireless 42-47
Electric only, Solar control, additional terminal block 48-49
Anti-legionella option 50
DWH circulation loop option 47
Wiring diagrams 48-49
System set-up
Hydraulics 54
Clearly Solar Controller 55
Clearly Solar technical data 56-57
Notes 58-59
Useful notes 60-61
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Clearly Solar
Features and benefi ts
• One provider, one solution, one warranty for all items
• A range of packs to suit every type of installation, in-roof,
on roof, or flat roof (mounted on A-frames)
• Easy to order packs 1, 2 and 3 panel packs – One article number
with everything you need in it
• Vertical and Horizontal orientation possible
• Developer packs available enabling a 2-stage delivery, minimising
space and security requirements on site
• Twin coil cylinders available in 200, 250, and 300 litres
• Intelligent controller minimizes the boiler re-heat reliance,
maximizing efficiency
• Lightweight panel - Only 38kgs dry weight
• Simple to fit on roof brackets – no frames or rails to construct
• Unique tool free fitting of hydraulic connections
• Flow and return connections made by the installer to maximise
siting flexibility
• Optional pipework kit for easy piping of the system
• A host of accessories to complement the installation, and aid
the installer
All Clearly Solar packs contain:
• Collectors
• Type P / Type S / A-frames / In-roof kit
• Hydraulic Connection Set
• Hydraulic Extension Set (if more than 1 collector)
• Controller
• Pump Station
• Solar Fluid
• Expansion Vessel
• Protection Vessel
• Automatic Air Separator
The straightforward Solar Thermal Solution
Designed specifi cally for use on UK homes, Clearly Solar has everything
you need to look for in a flat plate solar thermal solution. Glow-worm’s
Clearly Solar system can deliver between 50 and 60% of your domestic
hot water every year. In the summertime it can be as high as 100%
which means that your boiler may never have to fi re up, saving energy
and money.
Robust and subtle design
Clearly Solar comes in a simple pack solution ensuring that you have
everything you need for your solar thermal installation. The flat plate
collectors are made from black anodised aluminium which makes them
hard wearing, robust and very subtle, neatly fi tting into or onto a roof.
Alternatively, if the inclination or aspect of the roof is not perfectly suited
for a solar installation, Clearly Solar can also be installed on A-frames
which are extremely easy to construct and site on a flat roof or in a garden.
Total compatibility
Clearly Solar is a pressurised system, meaning that it is completely
full of heat transfer fluid and sealed from the atmosphere (a similar
concept to a sealed heating system). Clearly Solar is fully compatible
with all new and existing open vent and sealed system boilers
(including the complete Glow-worm range) or immersion heaters in
non-gas areas.
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Solar system selector guide
PIPE WORK PACK00200806631
FROM ROOF AND PANEL TYPE SELECTOR
CYLINDERAND
PIPEWORK
200l0010010915
300l0010010917
CYLINDERTYPE
250l0010010916
ROOF TYPE ON
SLATE/ FLAT TILE
CYLINDERSELECTION
ON
ON ROOF PACKHORIZONTAL 1
PANEL0020078867
ON ROOF PACKHORIZONTAL 2
PANEL0020078868 ON ROOF PACK
HORIZONTAL 3PANEL
0020078869
ON ROOF PACKVERTICAL 1
PANEL0020078855 ON ROOF PACK
VERTICAL 2PANEL
0020078856 ON ROOF PACKVERTICAL 3
PANEL0020078857
HORIZONTAL ORVERTICAL
ROOF TYPEONTILE
CYLINDERSELECTION
ONON ROOF PACKHORIZONTAL 1
PANEL0020078864
ON ROOF PACKVERTICAL 1
PANEL0020078852
ON ROOF PACKVERTICAL 2
PANEL0020078853
ON ROOF PACKVERTICAL 3
PANEL0020078854
ON ROOF PACKHORIZONTAL 2
PANEL0020078865 ON ROOF PACK
HORIZONTAL 3PANEL
0020078866
SOLAR EQUIPMENT SELECTOR
SOLAR EQUIPMENT SELECTOR
HORIZONTAL ORVERTICAL
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SOLAR EQUIPMENT SELECTOR
Solar system selector guide
ROOF TYPEIN
CYLINDERSELECTION
IN
IN ROOF PACKHORIZONTAL 1
PANEL0020078870
IN ROOF PACKHORIZONTAL 2
PANEL0020078871
IN ROOF PACKHORIZONTAL 3
PANEL0020078872
IN ROOF PACKVERTICAL 1
PANEL0020078858 IN ROOF PACK
VERTICAL 2PANEL
0020078859 IN ROOF PACKVERTICAL 3
PANEL0020078860
HORIZONTAL ORVERTICAL
A-FRAME
CYLINDERSELECTION
A-FRAME
A FRAME PACKHORIZONTAL 1
PANEL0020078873
A FRAME PACKVERTICAL 1
PANEL0020078861
A FRAME PACKVERTICAL 2
PANEL0020078862
A FRAME PACKVERTICAL 3
PANEL0020078863
HORIZONTAL ORVERTICAL
A FRAME PACKHORIZONTAL 2
PANEL0020078874
A FRAME PACKHORIZONTAL 3
PANEL0020078875
1 Panel 2 Panel 2 Panel 3 Panel
Flurocyl₂ Size* 200 Litres 200 or 250 Litres 250 or 300 Litres 300 Litres
* Flurocyl₂ should be correctly sized
Minimum number of persons in household 1 Person 1 Person 2 People 3 People
Maximum number of persons in household 2 People 3 People 4 People 5 People
Household average daily hot water usage Up to 100 Litres 80 to 120 Litres 100 to 140 Litres 120 to 180 Litres
Note: This system sizing rule of thumb will deliver 60% of annual DHW assuming near optimum collector
orientation. For precise sizing please refer to the product installation manual or seek advice from
Glow-worm’s technical helpline.
Basic guide to solar system sizing
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System sizing Specifi c system sizing calculationsSteps 2-4
Specifi c system sizing calculations
1 Panel 2 PanelOptions A
2 PanelOption B
3 Panel
Cylinder Size* 200l 200 / 250l 250 / 300l 300l
Minimum No. persons household
1 1 2 3
Maximum No. persons household
2 3 4 5
Average daily hot water usage
100l 80 - 120l 100 - 140l 120 - 180l
Typical usage per person
Daily energy requirement (kWh/d)
Low usage 20-30 l DHW (45°C) 0.8-1.2
Typical usage 30-50 l DHW (45°C) 1.2-2.0
High usage 50-70 l DHW (45°C) 2.0-2.8
Washing machine or dishwasher
120-180 l 0.8
* Cylinders should be correctly sized
Note: This system sizing rule of thumb will deliver 60% of annual DHW assuming near
optimum collector orientation. Please ensure you correctly size the system. For further
help, please contact Glow-worm's technical help line.
Notes
• Daily hot water usage typically 40 l per person
• Washing machine daily hot water usage typically 20 l (4 person)
• Dish washer daily hot water usage typically 20 l (4 person)
• Cold mains supplied at 10°C / hot water supplied at 45°C
• Cylinder volume 1.5 to 2 times the household daily hot water usage
• Approx 50 l cylinder volume per 1m2 of collector area under optimum
conditions
• On no account fall below 35 l of cylinder volume per m2 of collector
being used
• Do not signifi cantly oversize cylinder
To calculate specifi c system sizes, please follow steps 1 through to 6
Step 1
Work out your domestic hot water demand using the table below
Note: Multiply the usage per person by the number of people in the house.
This will then tell you how much hot water is required.
Step 2
Work out the cylinder size using the following rules
• Solar cylinder size should be 1.5 to 2 times the household daily hot
water usage
• Ensure that the Clearly Solar Cylinder size allows the minimum of
50 l per 1m2 of collector area under optimum conditions
• Do not signifi cantly oversize cylinder
• Please use the table on page 4 as a guide
Step 3
Work out the heat requirement for hot water demand
Qwater = V x ΔT x 0.4234
Where
Qwater = Annual heat requirement (kWh)
V = Daily volume of water (l)
ΔT = Temperature diff erence between cold mains in and
hot water out (K)
Step 4
Work out the annual solar radiation
Annual solar radiation (kWh/m2) = Qsolar
Use this map to estimate annual solar radiation
1000
1100
1200
900
55
65
Image supplied by Solar Trade Association
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Specifi c system sizing calculationsSteps 5-6
Orientation Collector Inclination at 30˚
Collector Inclination at 50˚
Collector Inclination at 70˚
E 1.64 1.61 1.61
ESE 1.45 1.47 1.61
SE 1.17 1.15 1.34
SSE 1.04 0.98 1.14
S 1.00 0.94 1.11
SSW 1.03 0.97 1.13
SW 1.13 1.09 1.27
WSW 1.35 1.35 1.60
W 1.64 1.61 1.61
Step 5
Using this table to select the correction factor (f)
Correction factor
Step 6
Use the values calculated in steps 1 to 5 to work out the collector area
required
Collector area
A= f x C x Qwater
0.3 x Qsolar
A = Collector area (net m2)
f = Correction factor (See table opposite)
C = Required contribution of solar towards hot water (%÷100)
normally 40-60%
Qwater = Annual heat requirement (kWh)
Qsolar = Annual solar radiation (kWh/m2)
Rule of thumb 1m2 of collector area per person
Once you have calculated your specifi c system requirements you can
then:
• Select your required solar pack (See page 8)
• Select your required cylinder (See page 8)
Notes
• Recommended maximum of 2 collectors on 200/250 l and maximum
3 collectors on 300 l cylinders
• For east/west installations, please seek advice from a professional
design service
Straightforward ordering INSTALLER Step 1
Panel Pack Options: Part No. 1 Panel Pack
2 Panel Pack
3 Panel Pack
In roof pack: Vertical 0020078858 0020078859 0020078860
This pack contains
Vertical Flat Plate collector 0010006294 1 2 3
In-roof one collector kit - Vertical
0020060316 1
In roof two collectors kit - Vertical
0020060318 1 1
In roof kit - additional collector -Vertical
0020060327 1
Easy fi t Hydraulic connection set In-Roof
0020065271 1 1 1
Easy fi t hydraulic extension set, In-roof/A-frame
0020059909 1 2
Clearly Solar controller 0020054960 1 1 1
Clearly Solar pump station 0020129143 1 1 1
Expansion vessel 18 l 0020054963 1
25 l 0020054992 1
35 l 0020054993 1
Solar fluid 20 l 0020054968 1 2 2
Protection vessel 0020054966 1 1 1
Automatic air separator 0020054969 1 1 1
Step 1: Vertical In roof packs
Step 1: Horizontal In roof packs
Panel Pack Options: Part No. 1 Panel Pack
2 Panel Pack
3 Panel Pack
In roof pack: Horizontal 0020078870 0020078871 0020078872
This pack contains
Horizontal Flat Plate collector
0010006295 1 2 3
In-roof one collector kit - Horizontal
0020060315 1
In roof two collector kit - Horizontal
0020060317 1 1
In roof additional collector kit - Horizontal
0020060326 1
Easy fi t Hydraulic connection - set In Roof
0020065271 1 1 1
Easy fi t hydraulic extension set, In-roof/A-frame
0020059909 1 2
Clearly Solar controller 0020054960 1 1 1
Clearly Solar pump station 0020129143 1 1 1
Expansion vessel 18 l 0020054963 1
25 l 0020054992 1
35 l 0020054993 1
Solar fluid 20 l 0020054968 1 2 2
Protection vessel 0020054966 1 1 1
Automatic air separator 0020054969 1 1 1
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