Fact sheet
HW 228/328
District heating substation for large properties
FEATURES AND BENEFITS
• Substation for apartment houses and small
properties
• Indirect heating - one or two heating circuits
• Connections for DHW cylinder on the secondary side
• Electronic control of heating (HE) temperature
• Capacity: 39 - 95 kW HE / 35 kW FH / 75 kW
cylinder or radiator
• Pipes connection in top or bottom of substation = Savings in installations costs
• Pipes and plate heat exchanger made of
stainless steel
Application
The HW 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 15-25
apartments. The HW 228/328 is available with
Danfoss ECL 210 or 310 for control of both the
heating circuit and the domestic hot water
circuit. The HW 228/328 variants offer capacities
ranging from 44 to 130 kW heating (27 to 55 kW
for one pipe systems) and 40 to 185 kW domestic hot water. Please contact our sales department and together we shall find the optimum
solution for your exact requirements.
Construction
The HW 228/328 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 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 HW 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 HW 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 HW 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 HW 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. 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 228/328 is connected to a system
without recirculation, internal circulation must
be established to prevent calcification.
• Electrical wiring from factory - Plug & Play
Heat exchangers for DHW heating
The heat exchangers used in the HW 228/328
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 328 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
Connections:
1. DH supply 5. DCW
2. DH return 6. DHW
3. HE supply 7. Circulation
4. HE return
Weight: Max. 110 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
Connections sizes:
DH, HE, DCW, DHW: G 1“ or 5/4” (int. thread)
Circulation: G 1“ or ¾“ (int. thread)
HEATING: CAPACITY EXAMPLES
© Danfoss | DHS-SRMT/ PL | 2018 . 04
VL.IE.L2.02
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