Buderus 7 735 500 669, Installation And Maintenance Instructions For Contractors

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3 Regulations
SU120.5 | SU160.5 | SU200.5 | SU200.5 E – 6 720 819 283 (2016/04) 37
2.6 Product description
3 Regulations
Observe the following directives and standards:
• Local regulations
•
EnEG (in Germany)
• EnEV (in Germany)
Installation of, and equipment for, heating and water heating systems:
•
DIN and EN standards
– DIN 4753-1 – Water heaters ...; requirements, identification,
equipment and testing
– DIN 4753-3 – Water heaters ...; corrosion protection on the
water side through enamel coating; requirements and testing
(product standard)
– DIN 4753-6 – Water heating systems ...; cathodic corrosion
protection for enamelled steel cylinders; requirements and
testing (product standard)
– DIN 4753-8 – Water heaters ... , part 8: Thermal insulation of
DHW cylinders up to 1000 l nominal capacity – requirements and
testing (product standard)
– DIN EN 12897 – Water supply - regulation for ... DHW cylinders
(product standard)
– DIN 1988 – Technical rules for potable water installations
– DIN EN 1717 – Protection of potable water against
contamination ...
– DIN EN 806 – Technical rules for potable water installations
– DIN 4708 – Central DHW heating systems
• DVGW
– Code of practice W 551 – Potable water heating systems and
pipework; technical measures to inhibit the growth of legionella
bacteria in new systems; ...
– Code of Practice W 553 – Sizing DHW circulation systems ... .
4 Transport
▶ When handling, prevent DHW cylinders from falling.
▶ Move packed DHW cylinder with a sack trolley and strap (

Fig. 4,
page 61).
-or-
▶ Move unpacked DHW cylinder with a transport net; during handling,
protect connections against possible damage.
5 Installation
The DHW cylinder is delivered as a fully assembled unit.
▶ Check that the DHW cylinder is complete and undamaged.
5.1 Siting
5.1.1 Installation site requirements
▶ Site the DHW cylinder on a plinth if there is a risk that water may
collect at the installation site.
▶ Site the DHW cylinder in dry internal areas that are free from the risk
of frost.
▶ Observe the minimum room height (

Table 9, page 59) and
minimum wall clearances inside the installation room
(

Fig. 6, page 61).
5.1.2 Positioning the DHW cylinder
▶ Stand the DHW cylinder upright and level it (

Fig. 7 to Fig. 8,
page 61).
▶ Apply Teflon tape or Teflon string (

Fig. 9, page 62).
5.2 Hydraulic connection
5.2.1 Connecting the DHW cylinder on the water side
System example with all recommended valves and stopcocks
(

Fig. 10, page 62).
▶ Use installation material that is heat-resistant to 160 °C (320 °F).
▶ Never use open vented expansion vessels.
▶ Use metal connection fittings in DHW heating systems with plastic
lines.
▶ Size the drain line in accordance with the connection.
▶ To facilitate blow-down, never install bends in the drain line.
▶ Keep primary lines as short as possible and insulate them.
▶ If using a non-return valve in the cold water supply: Install a safety
valve between the non-return valve and the cold water inlet.
▶ Install a pressure reducer if the static system pressure is in excess of
5 bar.
▶ Seal all superfluous connections.
Pos. Description
1 DHW outlet
2 DHW circulation connectio
3 Cylinder flow
4 Sensor well for temperature sensor, heat source
5 Cylinder return
6 Cold water inlet
7 Indirect coil for reheating by the boiler, enamelled smooth
tube
8 Female connection for installing an E-heating system
(SU200.5 E)
9 Magnesium anode with electrical insulation
10 Cylinder, enamelled steel
11 Casing, painted sheet metal with rigid polyurethane foam
insulation, 50 mm
12 Inspection apertures for service and cleaning
13 PS casing lid
Table 6 Product description (

Fig. 3, page 60 and Fig. 10, page 62)
NOTICE: System damage through inadequate load
bearing capacity of the supporting surface or unsuitable
substrate.
▶ Ensure that the installation area is level and offers
sufficient load-bearing capacity.
WARNING: Risk of fire through soldering and welding!
▶ Take appropriate safety measures when soldering
and welding as the thermal insulation is flammable.
For example, cover up the thermal insulation.
▶ Check cylinder casing after completion for perfect
condition.
WARNING: Risk to health through contaminated water!
Work carried out without due care for cleanliness
contaminates the potable water.
▶ Install and equip the DHW cylinder hygienically in
accordance with national standards and guidelines.