Danfoss SE, SES, SEK-LK, REAK, SE-R Operating guide
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Instructions for installation and use
Stainless steel drinking water tank
(SE/SES/SEK-LK/REAK)
Storage tank water heater
(SE-R/-RG)
Drinking water storage tanks in the abovementioned series are standing stainless steel
tanks with no heating coils, which are heated
by means of an external flow domestic hot
water heater. Domestic hot water cylinders
in the SE-R/SE-RG series are standing water
heaters where the contents of the tank are
heated by means of an internal heating coil
using the heating water.
Operational safety /
proper use
Transport / Storage Transport must be adapted to local conditions.
Operational safety of the containers is only
guaranteed if they are used as intended.
This means that the above-mentioned storage
tanks and water heaters may only be used to
heat and store drinking water. If the drinking
water quality is known to be critical,
the manufacturer should be consulted
before use. In particular, a chloride content
of more than 120 mg/l at temperatures
of ≥ 60°C is considered to be critical.
The permissible temperatures and pressures
specified on the rating plate (usually 10 bar /
95°C in the tank compartment) must not be
exceeded. Negative pressure is not permitted.
Any other type of use and/or different use
is prohibited.
Damage to thermal insulation during transport
must be avoided and should be dismantled,
particularly for transport over long distances.
A suitable means of transport should ensure
Containers, coils and all connections are made
of corrosion-resistant WN 1.4571 stainless steel.
The thermal insulation consists of EPS with
a laminated fleece and a polystyrene or – with
a volume of more than 4000 l – melamine resin
foam (fleece) with a polystyrene cover (CFC-free).
Special types of insulation can be provided
on request.
The containers are especially unsuitable for
thermal, lake or sea water. The operator alone
is the sole responsible party for all damage
caused by improper use.
This operating manual must be kept in
the immediate vicinity of the system and
must be accessible to installation, servicing,
maintenance and cleaning staff at all times.
The containers may only be used if they
are in perfect and safe condition.
All maintenance and inspection openings
must be accessible at all times. Maintain
appropriate installation distances.
that the connections or container sheath do not
become deformed. Direct contact with ferritic
materials and damage to the surface must be
avoided. The storage area should be dry and
free of frost.
Installation / Assembly Assembly must be carried out by a specialist
company, which assumes responsibility
for perfect assembly and equipment.
The installation surface must be level.
The storage tank must be installed in a frostfree room. The thermal insulation must be
fully installed before connecting the pipes.
During assembly, particular care must be taken
to ensure that only stainless steel, plastic or red
bronze molded parts are used.
The use of copper or carbon steel is prohibited.
It should also be ensured that no chips or other
foreign particles enter the storage tank.
During assembly, all applicable standards and
regulations – in particular the Drinking Water
Ordinance (Trinkwasserverordnung; TrinkwV)
2013, DIN 1988, DIN 4747, DIN 4751, DIN 4573,
DIN EN 806, DIN EN 1717, DVGW Worksheet
W 551, the VDI and the utilities regulations –
and all local regulations must be observed.
© Danfoss | 2018.06
Every drinking water heating system must
be equipped with an approved, certified
safety diaphragm valve.
The nominal size of the safety valves must
be selected according to the nominal volume/
storage capacity and heating capacity:
< 200 liters: DN 15 (Rp ½),
Max. heating capacity 75 kW
> 200 to 1000 liters: DN 20 (Rp ¾),
Max. heating capacity 150 kW.
> 1000 liters: DN 25 (Rp1),
Max. heating capacity 250 kW
The safety valve must be equipped with
a blow-off line according to DIN 1988; this must
not have more than two bends. The maximum
length should not exceed 2.00 m.
VI.BO.A3.02 | 1
Stainless steel drinking water storage tank, storage tank water heater
A label with the following information must be
attached near the blow-off line:
When heating, water may escape from
the blow-off pipe for safety reasons!
Do not close.
The installation of a safety temperature
monitor may be required according to
DIN 4747-1 (11/2003) (see Table 6) -> check!
Commissioning /
Operating Conditions /
Decommissioning
Maintenance / Cleaning Drinking water components must undergo
Before initial operation, the system must
be flushed and properly vented.
The installation of a filter in the cold water supply
to the storage tank is recommended. After the
first filling, the filter should be cleaned again.
Before heating, the functionality of all safety
devices must be checked. All flange and screw
connections must be checked both in cold and
heated conditions and re-tightened if necessary
(please follow the instructions in Maintenance).
regular maintenance and cleaning to maintain
the quality of the drinking water. In particular,
DIN 1988 must be observed. Other technical
rules, such as the VDI Guideline 6023, DIN EN
806-5 and DIN EN 1717 contain information
about this. The operator is responsible for this
maintenance and cleaning and should contract
a specialized company for this purpose.
The following recommendations for regular
maintenance and servicing should be observed:
1. Checks / Inspections
For safety reasons, the temperature of the safety
temperature monitor must be set to a maximum
of 75°C.
In areas where the drinking water tends to
precipitate hardeners, we recommend limiting
the temperature of the heating medium
to approx. 70°C. Pre-regulation must be carried
out here. As a rule, the drinking water outlet
temperature at the water temperature controller
(TR) should be set to a temperature of 60°C
(see Worksheet W 551 from the German
Association for Gas and Water (Deutsches
Vereinigung des Gas- und Wasserfaches))
DIN EN 806-2.
Alternating operation, i.e. short-term
pressure fluctuations and load changes
of more than ± 20% or more than 500 times
per year, is not permitted.
The system must be vented for emptying.
Negative pressure can lead to damage
to system components or the tank.
Operation of the system is the sole
responsibility of trained and authorized
staff with the necessary expertise.
2. Maintenance / Cleaning
a) monthly
- Cleaning the dirt filter or strainer /
backwashing
b) annually
- Decommissioning of the entire system
- Cleaning the water heater and container;
decalcification if necessary
- Cleaning the dirt filter
- Checking the meter for calibration periods
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a) monthly
- Inspection of all connections and fittings
for tightness; tighten if necessary (be sure
to remove hand/manhole insulation)
- Checking the required and permissible
parameters (pressure/temperature)
b) additionally every six months
- Checking the safety devices
(pressure/temperature)
c) additionally every year
- Checking all system components for
function and operability (e.g. lever
of fittings opens/closes)
3. Torques:
- Hand-hole 160/120:
8 M10x20 stainless steel screws,
Material: A2-70,
Torque: ~ 20 Nm
- Hand-hole 180/120:
8 M10x20 stainless steel screws,
Material: A2-70,
Torque: ~ 20 Nm
- Hand-hole 260/180:
10 M10x20 stainless steel screws,
Material: A2-70,
Torque: ~ 20 Nm
- Manhole 480/400:
26 M14x55 stainless steel screws,
Material: A2-70,
Torque: ~ 50 Nm
VI.BO.A3.02
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