Fact sheet
SW 228/328
District heating substation for large properties
FEATURES AND BENEFITS
• Direct heating with mixing circuit and
DHW heating based on the flow principle
• Domestic hot water recirculation
• Supplied with Danfoss ECL 210 or 310
controller
• Equipped with A-labelled low-energy
pump
• Possibility of mounting of heat meter in
district heating supply or return pipe
• Pipes and heat exchanger in stainless steel
• Minimized risk of lime scale and bacteria
formation
• The substation is very service-friendly due
to practical piping and assembly with nuts
and gaskets
Application
The SW 228/328 is made in a compact design and is especially suitable for supply of
heating and domestic hot water for large
pro-perties and apartment houses comprising 14-30 apartments. The SW 228/328
is available with Danfoss ECL 210 or 310 for
control of both the heating circuit and the
domestic hot water circuit. The substation is
very suitable for one- and two pipe systems
and is also applicable for systems with floor
heating.
The SW 228/328 variants offer capacities ranging from 35 to 165 kW heating and 40 to
200 kW domestic hot water. Please contact
our sales department and together we shall
find the optimum solution for your exact requirements.
Construction
The SW 228/328 is supplied with a brazed
plate heat exchanger for domestic hot water heating, electronic actuators, shut-off
valves, non-return and safety valve, pump,
circulation pump, thermometers, strainers,
sensor pockets as well as differential pressure controller. Actuators and pumps are
electrically wired from factory and supplied with CEE plug for connection to 220 V.
The electronic control ECL 310 is prepared
for WebAccess, which enables remote control and remote monitoring via the internet/
intranet.
The substations are delivered preassem-bled,
electrically wired internally and the electronic control is tested for function and preset
from factory. The substation can be supplied
with fitting piece for heat meter in the district
heating supply and return pipe (to be specified when ordering).
Design
The SW 228/328 is designed for wall-mounting and during the construction much importance has been attached to a clear and
user-friendly placement of all components.
The SW 228/328 is built on a frame of galvanized iron and offers variable connection
possibilities, as connection of pipes can be
established both in the top or in the bottom
(standard) of the substation. The SW 228/328
can be supplied with a white-lacquered steel
cover with door, which enables easy access
for meter reading and service purposes.
Domestic hot water recirculation
As standard the SW 228/328 is supplied with
a low-energy pump for domestic hot water
recirculation and can easily be connected to
existing systems with DHW recirculation. Domestic hot water recirculation ensures that
hot water is produced immediately, when
tapping starts. This ensures the best possible
DHW comfort og eliminates water wastage.
If the SW 228/328 is connected to a system
without recirculation, internal circulation
must be established to prevent calcification.
Heat exchanger for DHW heating
The heat exchanger used in the SW 228/328
is a brazed, highly efficient Danfoss plate
heat exchanger, which has been tested and
approved according to the PED-directive.
Meter reading and setting
The heat meter can be placed in the front
part of the substation, easily readable. All
thermometers are placed so they are easy to
read. Components, which can be adjusted,
are easily accessible.
Service og maintenance
The substation is very service-friendly due to
practical piping and assembly with nuts and
gaskets. It is mounted on the wall and as all
pipes are placed in pipe bracket distance, it is
possible to establish a nice piping.
www.danfoss.com
CIRCUIT DIAGRAM – EXAMPLE - SW 328 WITH ECL 310, A266
2 Plate heat exchanger DHW
4 Diff. pressure controller
DHW
DCW
Circ.
DH
Supply
5 Strainer
6 Non-return valve
7 Ball valve
8 Pump HE
9 Circulation pump, DHW
10 Balancing valve, DHW
12 Safety valve DHW
13 Thermometer
14 Manometer w/shut-off valve
17 Air valve
23 Sensor pocket for heat meter
(optional)
24 Fitting piece for heat meter,
(optional)
25 Controller Danfoss ECL310/A266
26 Outdoor sensor
27 Sensor forward/return
28 Sensor, DHW
29 Actuator 2
30 Valve 2
31 Actuator 1
32 Valve 1
P, M and S refer to the Danfoss ECLinstruction manual
HE
Supply
DH
Return
Design specifications:
Nominal pressure (prim/sec): PN 10 / PN 10
Max. supply temperature.: 120 °C
Min. ΔP: 0,75 bar incl. differential
pressure controller
(alternatively 0,5 bar)
Weight: Max . 100 kg
Colour (cover): White RAL 9010
Electrical supply: 220 V AC
Dimensions (mm):
Without cover: H 1350 x W
max. 947 x D 380
With cover: H 1350 x W 1030 x D 420
CAPACITY, WEIGHT AND DIMENSIONS
Heating and DHW capacity examples
Contact your local Danfoss sales representative for capacity examples
HE
Return
Connections:
1. DH supply 5. DCW
2. DH return 6. DHW
3. HE supply 7. Circulation
4. HE return
Connections sizes:
DH, HE, DCW, DHW: G 1“ or 5/4” (int. thread)
Circulation: G 1“ or ¾“ (int. thread)
© Danfoss | DHS-SRMT/ PL | 2018 . 05
HEATING: CAPACITY EXAMPLES
VL.IE.K2.02
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