Danfoss SW 235/335, SW 242/342 Fact sheet
Fact sheet
SW 235/335 - 242/342
District heating substation for large properties
FEATURES AND BENEFITS
• Substation for apartment houses
• Direct heating, DHW heating based on the
flow principle
• 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 235/335 - 242/342 is made in a compact design and is especially suitable for supply of heating and domestic hot water for
large properties and apartment houses comprising more than 30 apartments. The SW
235/335 - 242/342 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 235/335 - 242/342 variants offer capacities ranging from 35 to 190 kW heating
and 40 to 300 kW domestic hot water. Please
contact our sales department and together
we shall find the optimum solution for your
exact requirements.
Construction
The SW 235/335 - 242/342 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 235/335 - 242/342 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 235/335 - 242/342 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 235/335 - 242/342 can be supplied with
a white-lacquered steel cover with two detachable front pieces, which enables easy access for meter reading and service purposes.
Domestic hot water recirculation
As standard the SW 235/335 - 242/342 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
235/335 - 242/342 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 235/335242/342 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 HW 335/342 WITH ECL 310, A266
DHW
DCW
Circ.
DH
Supply
DH.
Return
Design specifications:
Nominal pressure (prim/sec): PN 16 / PN 10
Max. supply temperature.: 120 °C
Min. ΔP: 0,75 bar incl. differential
pressure controller
(alternatively 0,5 bar)
2 Plate heat exchanger DHW
4 Diff. pressure controller
5 Strainer
6 Non-return valve
7 Ball valve
8 Pump HE
9 Circulation pump, DHW
10 Balancing valve, DHW
12 Safety valve DHW
HE
Supply
HE
Return
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
Weight: Max. 150/180 kg
Colour (cover): White RAL 9010
Electrical supply: 220 V AC
Dimensions (mm):
Without cover HW 235/335: H 1452 x W max. 1485 x D 575
Without cover HW 242/342: H 1452 x W max. 1621 x D 575
Cover HW 235/335: H 1300 x W 1540 x D 600
Cover HW 242/342: H 1300 x W 1740 x D 600
Connections sizes - HW 235/335:
DH, HE, DHW, DCW: G 1½“ (int. thread)
Circulation: G 1” (int. thread)
Connections sizes - HW 242/342:
DH: G 2“ (int. thread)
HE, DHW, DCW: G 1½“ (int. thread)
Circulation: G 1“ (int. thread)
HEATING: CAPACITY EXAMPLES
Contact your local Danfoss sales representative for capacity examples
Connections:
1. District heating (DH )supply 5. DCW
2. District heating (DH return 6. DHW
3. Heating (HE) supply 7. Circulation
4. Heating (HE) return
© Danfoss | DHS-SRMT/ PL | 2018 . 05
VL.IE.P2.02
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