Danfoss S 22 Fact sheet
Fact sheet
S 22
District heating substation for small properties and apartment houses
Application
The S 22 is made in a compact design and is
especially suitable for supply of heating and domestic hot water for small properties and apartment houses. The S 22 is available with Danfoss
ECL 310 for control of both heating and domestic hot water circuits. The substation is very
suitable for one- and two pipe systems and is
also applicable for systems with floor heating.
The S 22 variants offer capacities ranging from
55 to 100 kW heating (10 to 16 kW floor heating)
and 40 to 110 kW domestic hot water. Please
contact our sales department and together we
shall find the optimum solution for your exact
requirements.
Construction
The S 22 is supplied with a brazed plate heat exchanger for domestic hot water heating, electronic actuators and valves, 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 is prepared for WebAccess, which enables remote control and remote
monitoring via the internet/intranet. The substations are delivered preassembled, electrically
wired internally and the electronic control is tested for function and preset from factory.
The substation is supplied without fitting piece
for heat meter. Fitting piece for heat meter is
available as an option.
Design
The S 22 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 S 22 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 S 22 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.
Heat exchanger for DHW heating
The heat exchanger used in the S 22 is a brazed,
highly efficient Danfoss plate heat exchanger,
which has been tested and approved according
to the PED-directive.
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
• Electrical wiring from factory - Plug &
Play
Reading and setting
All thermometers are placed so they are easy to
read. Components, which can be adjusted, are
easily accessible.
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
DHW
DCW
Circ.
DH
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. 65 kg
Colour (cover): White RAL 9010
Electrical supply: 220 V AC
Dimensions (mm):
Without cover: H 1037 x W 545 x D 370
With cover: H 1037 x W 600 x D 400
Cover
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
13 Thermometer
Cover
Cover
Connections:
1. DH supply 5. DHW
2. DH return 6. HE return
3. DCW 7. HE supply
4. Circulation
Connections sizes:
DH, HE, DCW, DHW: G 1“ (int. thread)
Circulation: G 1“ or ¾“ (int. thread)
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
HE
Return
Wall
Top view
Flow
l/h
Tot al (winter)
Pres. loss
Prim.
2)
total
bar
Flow
Primary
total
DHW: Capacity examples
CAPACITY, WEIGHT AND DIMENSIONS
Secondary
return/supply
°C
10/50
10/50
10/50
10/50
Tap load
l/min.
16.33 0.25 830 55 70/30 30/60 0.27 118 3 0.49 150 0
26.66 0.33 1350 100 70/30 30/60 0.44 2150 0.86 2590
36.83 0.57 1870 80 70/30 30/60 0.28 1720 0.74 2710
25.16 0.56 1340 65 90/40 40/74 0.24 1118 0.51 1640
34.00 0.54 1810 90 90/40 4 0/74 0.23 1548 0.54 2250
25.16 0.56 1340 10 70/30 30/35 0.05 215 0.67 1350
25.16 0.56 1340 16 70/30 30/35 0 .13 344 0.53 1750
Plate heat
exchanger
XB 37M-1 20 40
XB 37M-1 30 65
XB 37M-1 40 90
XB 37M-1 30 70 65/20.0
XB 37M-1 40 95 65/20.0
Varmt vand: Ydelseseks. med elektronisk styring, ECL 310, A266
DHW: Capacity examples HE: Capacity examples Tot al (winter)
XB 37M-1 30 70 65/20.0
XB 37M-1 30 70 65/20.0
Capacity
kW
supply/return
Primary
°C
60/18. 5 10/45
60/18. 5 10/45
60/18. 5 10/45
Pressure
loss prim.
1)
bar
HE: Capacity examples
Flow
Primary
l/h
Capacity
Primary
supply/return
kW
°C
HEATING: CAPACITY EXAMPLES
Secondary
return/supply
°C
Pressure loss
Primary
1)
bar
Primary
Danfoss Redan A/S · District Heating · Omega 7, Søften · DK-8382 Hinnerup · Denmark
Tel.: +45 87 43 89 43 · Fax: +45 87 43 89 44 · redan@danfoss.com · www.redan.danfoss.dk
© Danfoss | DHS-SRMT/ PL | 2017 . 12
VL.HE.J2.02
2)
l/h
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