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TECHNICAL DATA & INSTALLATION
INSTRUCTIONS FOR SCx DIRECT & INDIRECT
UNVENTED WATER HEATERS
Your water heater is made from Duplex Stainless Steel, which is
one of the toughest and best grades of steel currently available.
Each unit has been individually tested and inspected to
industry standard.
Your water heater uses advances in technology and innovative
techniques to provide you with a high performance water
heater at the best price possible.
No other type of water heater can provide all of the benefits
that can be achieved from unvented units such as the
SCx
Unvented Water Heater
.
IMPORTANT NOTICE FOR INSTALLATION
READ THESE INSTALLATION AND MAINTENANCE
INSTRUCTIONS BEFORE COMMENCING
UNVENTED CYLINDERS ARE DESIGNED TO BS STANDARD AND
INSTALLED TO RELEVANT BUILDING REGULATIONS
THE RELEVANT REGULATIONS ARE
ENGLAND & WALES – BUILDING REGULATION G3
SCOTLAND – TECHNICAL STANDARD P3
NORTHERN IRELAND – BUILDING REGULATION P5
AFTER INSTALLATION THE BENCHMARK LOG BOOK MUST BE
COMPLETED AND LEFT ALONG WITH THESE INSTRUCTIONS WITH
THE HOUSEHOLDER FOR FUTURE REFERENCE.
INSTALLATION INSTRUCTION MANUAL
TO BE LEFT WITH THE UNIT
CONTENTS
SPECIFIERS GUIDE
The law and unvented p3
The benefits of unvented systems p3
The benefits of
Dimplex Unvented Water Heaters p3
Standard energy losses p4
What is supplied with the
SCx unit? p4
INSTALLATION INSTRUCTIONS
Siting the SCx Unit p4
Check water pressure & flow rates p4
Connecting the water supply p5
Cold water valve p5
Drain tap p5
Pipework to taps p5
Secondary circulation p5
Wiring p7
Fitting immersion heaters p7
Fitting the thermal cut out & primary connections p7
Tundish p8
Commissioning the
SCx Unit p8
External expansion vessel p8
Scale p8
Draining p8
Discharge pipework p8
G3 Requirement p9
Problem solving p10
Spares p10
Part component references p10
Guarantee p11
DIAGRAMS
Dimensional data for DH / IDH
range of water heaters p3
Typical installation of a DH tank p5
Typical installation of a IDH tank p5
Secondary circulation connection p6
2 x 2 port (S-plan) valve system p6
2 port valve + 3 port mid position valve (y-plan) p7
Immersion heater p7
Schematic discharge pipe arrangement p8
DIMPLEX WATER HEATER SPECIFIERS GUIDE
THE BENEFITS OF DIMPLEX SCx UNVENTED
WATER HEATERS
● Annual inspection as per warranty
● Duplex Stainless Steel
● High quality finish
● Has one of the lowest heat losses for maximum economy
● No sacrificial anode - low maintenance
Overall Height
Tank Height
Bottom Heater
Water Inlet
Twin Thermostat
Bottom Coil
Top Coil
P & T Valve
45
574
Note:
All External Exposed
Pipework is 22mm Diameter
316L Stainless Steel
Overall Height
Tank Height
Bottom Heater
Water Inlet
Top Heater
P & T Valve
45
574
Note:
All External Exposed
Pipework is 22mm Diameter
316L Stainless Steel
THE LAW AND UNVENTED
It is legal to fit an Unvented Unit into any property. UK water
byelaws were amended to allow this change. There is no
longer a requirement to have an old-fashioned
“Tank-in-the-Roof” system.
THE BENEFITS OF UNVENTED SYSTEMS
● A real Power Shower without a noisy pump
● No tanks in the roof – no ballcocks to jam or leak – no
noise from tank filling
● All your water – hot and cold – is direct from the mains
● Site the SCx unvented water heater wherever convenient
● SCx fills your bath in minutes and will run two at the same
time (subject to good plumbing and flow rates)
● The SCx unit works off electricity (economy 7) or any oil or
gas fired boiler (not suitable for solid fuel boilers)
Dimensional data for Indirect Heat/Direct Heat range of water heaters
Direct Heat Exterior Reference Dimensions
Reference Tank Overall P&T Top Bottom Water
Volumes Height Height Valve Heater Heater In
litres mm mm mm mm mm mm
80 636 694 347 N/A 250 230
130 928 986 618 521 188 230
150 1056 1114 737 640 188 230
175 1213 1271 883 786 188 230
215 1455 1513 1108 1011 188 230
255 1723 1781 1356 1259 188 230
305 1999 2057 1613 1516 188 230
Indirect Heat Exterior Reference Dimensions
Reference Tank Overall P&T Bottom Top Bottom Temp Water Top
Volumes Height Height Valve Heater Coil Coil Monitor In Heater
litres mmmmmmmmmmmmmmmmmm
80 636 681 347 188 N/A 283 233 230 N/A
130 928 973 618 188 558 483 357 230 521
150 1056 1101 737 188 558 483 357 230 640
175 1213 1258 883 188 758 683 458 230 786
215 1455 1500 1108 188 758 683 507 230 1011
255 1723 1768 1356 188 758 683 608 230 1259
305 1999 2044 1613 188 758 683 608 230 1516
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