Dimplex Unvented Water Heater User Manual
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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
W
ater Inlet
Twin Thermostat
Bottom Coil
To
p Coil
P & T V
alve
45
574
Note:
All External Exposed
Pipework is 22mm Diameter
316L Stainless Steel
Overall Height
Tank Height
Bottom Heater
W
ater Inlet
Top Heater
P & T V
alve
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
mm
mm
mm
mm
mm
mm
mm
mm
mm
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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