Fact sheet
HW 235/335 - 242/342
District heating substation for large properties
FEATURES AND BENEFITS
• District heating substation for indirect
heating and domestic hot water
• DHW heating based on the flow principle
• Supplied with Danfoss ECL 210 or 310
controller
• Equipped with A-labelled low-energy
pump
• 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 HW 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 25 apartments. The HW
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 HW 235/335 - 242/342 variants
offer capacities ranging from 44 to 385 kW
heating (27 to 138 kW for one pipe systems)
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 HW 235/335 - 242/342 is supplied with a
brazed plate heat exchanger for heating and
domestic hot water production, electronic
actuators, shut-off valves, non-return and safety valves, A-labelled low-energy pumps for
heating and DHW recirculation, mano- and
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 electro
nic 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 HW 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 HW 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
HW 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 HW 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. On new constructions it is recommended to establish domestic hot water
recirculation, which ensures that hot water is
produced immediately, when tapping starts.
This ensures maximum DHW comfort og eliminates water wastage.
If the HW 235/335 - 242/342 is connected
to a system without recirculation, internal
circulation must be established to prevent
calcification.
Heat exchangers for DHW heating
The heat exchangers used in the HW
235/335- 242/342 are 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)
1 Plate heat exchanger HE
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
11 Safety valve HE
12 Safety valve DHW
HE
Supply
HE
Return
13 Thermometer
14 Manometer w/shut-off valve
15 Manometer
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 1
30 Valve 1
31 Actuator 2
32 Valve 2
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
Without cover HW 242/342: H 1452 x W
max. 1485 x D 575
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.O2.02
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