Dimplex SCxn175si, SCxn215sd, SCxn215si, SCxn255si, SCxn305si Installation And Operating Instructions Manual
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ST0109 – C 05/09
WATER
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
Installation and operating instructions
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
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0 Overall view
Figure 1 – Overall view of proposed installation sequence SCxn…d/i
SCxn80/130/150/175/215/255/305d
01
02
03
04
05
06
07
SCxn80/130/150/175/215/255/305i
11
08
Standard SCxn cylinder
01
02
03
04
05
07
09
10
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
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Figure 2 – Overall view of proposed installation sequence SCxn…sd/si
SCxn175/215/255/305sd
SCxn175/215/255/305si
18
01 02 03 04 05 07 08 09 10 11 12 13 14 15 16 17 18 01 02 03 04 05 07 12 13 14 15 16 17 06
Solar SCxn cylinder
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
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1 Contents
0 OVERALL VIEW 2
1 CONTENTS 4
2 BEFORE YOU START 5
G
ENERAL 5
C
OMPETENCE 5
H
EALTH AND SAFETY 5
R
ISK ASSESSMENT 6
3 SCOPE OF DELIVERY 6
4 PRODUCT FEATURES AND DESCRIPTIONS 7
5 INSTALLATION 9
5.1
GENERAL ADVICE 9
5.2
SITING CONSIDERATIONS 10
5.3
COLD WATER SUPPLY AND DISCHARGE PIPE WORK 10
5.4
HOT WATER OUTLET 12
5.5
IMMERSION HEATER 12
5.6
INDIRECT HEATING LOOP 13
5.7
SOLAR LOOP 14
5.8
SECONDARY RETURN 15
5.10
INSTALLATION EXPANSION VESSEL 15
5.11
WIRING SCHEMATIC AUXILIARY LOOP 16
5.12
WIRING SCHEMATIC SOLAR LOOP 19
5.13
SOLAR SENSOR INSTALLATION 19
6 COMMISSIONING 21
6.1
SCXN … D/I RANGE 21
6.2
SCXN … SD/SI RANGE 21
7 OPERATION 22
7.1
WATER TEMPERATURE DIRECT ELECTRIC HEATING 22
7.2
WATER TEMPERATURE AUXILIARY HEATING 23
8 MAINTENANCE 23
9 TROUBLESHOOTING 24
10 TECHNICAL DATA 25
10.1
SCXN … D/I 25
10.2
SCXN … SD/SI 26
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
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2 Before you start
General
Thank you for choosing a Dimplex product. We ensure you that every effort was made
at design, manufacture and delivery stages of this product to meet your expectations.
We ensure you of our best possible support throughout the product’s lifespan.
As part of ongoing product development and improvement Dimplex reserves the right to
undertake changes to the product without prior notice. Great care has been taken to
ensure this manual was correct at the time of print. Should you however discover any
issues with the information contained therein please do not hesitate to contact your
vendor.
We strongly recommend you read the whole contents of this manual before commencing the work.
Competence
Dimplex products have been designed and manufactured to the current relevant standards and under stringent quality control. It is therefore imperative that the product is
only installed by a:
- trained and
- competent
person as defined in the relevant regulations. Dimplex does not accept any liability for
damage done to persons or property resulting from undue handling and usage of this
product.
All regulations current at the time of installation are to be considered alongside the content of this manual as they form the code of best practice.
The guarantee of this product is linked to the ability of proving that the product was
installed, commissioned and maintained:
- by a competent person
- in accordance with Dimplex instructions and the current relevant regulations and legislation
- the product being registered with Dimplex at the time of installation using the form in
the Dimplex On Site Guide
- records showing the date of maintenance in accordance with the maintenance schedule as detailed in the On Site Guide
Health and Safety
The installation of this product is subject to the Health and Safety at Work Act. It is
your responsibility to ensure that the transport, storage, installation and operation of
the product is carried out in a safe manner.
Dimplex will not accept any liability due to damage caused to people or property resulting from negligence or not adhering to the relevant Health and Safety practises.
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
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Risk assessment
The compilation of a risk assessment is strongly recommended before installing the
product. The following areas require particular consideration in addition to the information required by the Health and Safety at Work Act.
- scalding: where appropriate or required by law a thermostatic mixing valve is to be
fitted to the hot water outlet of the cylinder
- explosion: the unit is fully equipped with all relevant safety equipment to comply with
current regulations. The correct design and function has been verified by independent
third party testing. The correct application thereof is the responsibility of the competent installer.
- water borne organisms (i.e. Legionella): if applicable a risk assessment should be
carried out following the recommendations outlined in the Approved Code of Practise
L8.
- the user preference must be considered when commissioning the system, in particular
when adjusting the solar and auxiliary system temperature and timer settings.
3 Scope of delivery
Please check the contents and condition of your delivery before signing the delivery
documentation. Contact your supplier immediately for any missing or damaged components. Claims for missing or damaged parts after signing for the delivery will not be
accepted.
SCxn
175/215/255/305
SCxn
80/150/175/215/255/305
d i sd si
Unvented stainless steel
cylinder including:
- cold water inlet
- hot water outlet
- ½” sensor pockets
- ½” secondary return
- auxiliary heating coil
- solar coil
- twin thermostat
- 3kW immersion
- T&P Valve
x1
x1
-
-
-
-
-
x1(SCxn80)/x2
x1
x1
x1
-
-
x1
-
x1
x1 x1
x1
x1 x2 x1
-
x1
x1 x2 x1
x1
x1 x2 x1 x1 x1 x2 x1 x1
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
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Figure 3 – Scope of delivery
4 Product features and descriptions
The Dimplex® unvented stainless steel cylinder range incorporates many features to
ensure the highest level of comfort in providing hot water while minimising energy requirements and environmental impact during manufacturing, operation and disposal.
The range covers storage volumes from 80 litres to 305 litres in various designs from
direct electric heated units, indirect units to a range of units allowing the use of renewable energy sources such as solar thermal.
A complete list of features provided by the whole range of cylinders is given in Figure 4.
Expansion vessel:
18 l: 175 l, 215 l
24 l: 255 l, 305 l
-
-
-
-
x1
x1
Expansion vessel
fixing kit
-
- x1
x1
Inlet control
group
2ba
r
6bar
2ba
r
6bar
3ba
r
6bar
3ba
r
6bar
Tundish
15mm – 22mm
x1
x1 x1 x1
Two port motorised valve 22mm
-
x1 - x1
Instructions x1
x1 x1 x1
Benchmark card x1
x1 x1 x1
SCxn…d
SCxn…i
SCxn…sd
SCxn…si
Pres. red.
Pres. rel.
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
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Feature
SCxn
d i si
sd
80
-
305
80 130 150 175 215 255 305
175
-
305
175
-
305
Materials
- inner cylinder
- outer cylinder
- inlet/outlet
- coils
- insulation
Duplex stainless steel
Dove grey leather grain coated steel
Stainless steel
Corrugated stainless steel
60mm PU foam (GWP=1, ODP=0)
Maximum operating conditions
- potable water temperature
- heating water temperature
- operating pressure
70°C
95°C
6bar
Cold water supply
- minimum dynamic pressure
- maximum pressure
- minimum flow rate
1.5bar
25bar
15 l/min
Connections
- cold water inlet
- hot water outlet
- secondary return
- coil flow and return
- sensor pocket
22mm stainless steel
22mm stainless steel
½”F BSP
22mm stainless steel
½”F BSP
Coil specification
- surface area [m²]
- rating [kW]
-
-
0.3
7
0.5
14
0.75
17
0.75/1.1
17/-
Immersion heater 1/
2
1 1 2
Thermostatic control
- direct input
- indirect input
- integral immersion heater thermostat and cut out
- external twin thermostat and cut out
Safety components
- pressure reducing valve and
strainer
- expansion relief valve
- temperature and pressure relief
valve
- factory pressure test
2bar
6bar
7bar / 90°C
10bar
3bar
6bar
7bar /
90°C
10bar
Other features Water inlet diffuser – prevents cold and hot water from mix-
ing
Water outlet sloped – improves stratification during draw off
and reduces heat loss
Light weight – easy handling
No anode – reduced service requirements
Approvals KIWA
BBA
Guarantee
- inner cylinder
- immersion heaters
- other components
25 years
2 years – excluding the effects of lime scale
5 years – excluding expansion vessel membrane pressure
Figure 4 – Product features
Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
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5 Installation
5.1 General advice
Please read the following section carefully before commencing installation. If in any
doubt, please call the appropriate help desk. Disregarding the instructions given in this
manual in its entirety and any relevant regulations, standards and codes of practice will
void the guarantee of this product.
Please note: the following instructions are structured in such a way that individual steps
are described. Not all steps will apply to all products. Figure 5 shows which steps apply
to which cylinder types.
Figure 5 – Chapter reference
Handling – depending on the size of the unit and access to its installation location consideration must be given to the handling of the unit. Please note that handling, installation and use of this product is subject to the Health and Safety at Work Act.
If the unit is not installed immediately, it should remain in its protective packaging with
all pipe protectors/end caps applied to prevent damage and dirt deposit inside the cylinder and the coils.
Pipe work – the pipe runs should be executed as short as possible, unused pipe work
should be removed and all remaining pipe work should be lagged in accordance with
regulatory requirements to prevent heat loss and the formation of condensation.
Taps and fittings – all taps and fittings incorporated in the unvented system should
have a rated operating pressure of 6 bar or above.
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