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 especiallysuitableforsupplyofheatinganddomestichot waterforsmallpropertiesandapartment 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 oneand two pipe systems and is also applicable for systems with floor heating. The S 22 variants offer capacities ranging from 55to100kWheating(10to16kWfloorheating) 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 S22issuppliedwithabrazedplateheatexchangerfordomestichotwaterheating,electro- nicactuatorsandvalves,shut-offvalves,non-re- turn 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 220V. The electronic control is prepared for WebAccess, which enables remote control and remote monitoring via the internet/intranet. The substations aredelivered 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.

Domestichotwaterrecirculation

AsstandardtheS22issuppliedwithalow-ener- gy pump for domestic hot water recirculation andcaneasilybeconnectedtoexistingsystems 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.

HeatexchangerforDHWheating

The heat exchanger used in the S 22 is a brazed, highly efficient Danfoss plate heat exchanger, whichhasbeentestedandapprovedaccording 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

Readingandsetting

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.

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CIRCUIT DIAGRAM - EXAMPLE

		2	Plate heat exchanger DHW
		4	Diff. pressure controller
	DHW	5	Strainer
		6	Non-return valve
		7	Ball valve
		8	Pump HE
	DCW	9	Circulation pump, DHW
		10	Balancing valve, DHW
		12	Safety valve DHW
	Circ.	13	Thermometer
	DH
	Supply
	DH
	Return

14 Manometer w/shut-off valve

17 Air valve

23Sensor pocket for heat meter (optional)

24Fitting piece for heat meter, (optional)

25Controller Danfoss ECL310/A266

26Outdoor sensor

27Sensor forward/return

28Sensor, DHW

29Actuator 2

30Valve 2

31Actuator 1

32Valve 1

P, M and S refer to the Danfoss ECLinstruction manual

HE

Supply

HE

Return

Design specifications:

Nominal pressure (prim/sec): Max. supply temperature.: Min. ΔP:

Weight:

Colour (cover):

Electrical supply:

Dimensions (mm):

Without cover:

With cover:

PN 10 / PN 10

120 °C	Cover
	Cover
0,75 bar incl. differential
pressure controller
(alternatively 0,5 bar)

Max. 65 kg

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White RAL 9010

220V AC

H 1037 xW 545 x D 370

H 1037 xW 600 x D 400

		Wall
Top view
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)

DHW: Capacity examples												HE: Capacity examples										Total (winter)
Plate heat	Capacity	Primary		Secondary		Tap load		Pressure		Flow		Capacity		Primary		Secondary		Pressure loss		Flow		Pres. loss		Flow
		supply/return		return/supply				loss prim.		Primary				supply/return		return/supply		Primary		Primary		Prim.		Primary
exchanger	kW	°C		°C		l/min.		1)bar		l/h		kW		°C		°C		1)bar		l/h		total2) bar		total2) l/h
XB37M-1 20	40	60/18.5		10/45		16.33		0.25		830		55		70/30		30/60		0.27		1183		0.49	1500
XB37M-1 30	65	60/18.5		10/45		26.66		0.33		1350		100		70/30		30/60		0.44		2150		0.86	2590
XB37M-1 40	90	60/18.5		10/45		36.83		0.57		1870		80		70/30		30/60		0.28		1720		0.74	2710
XB37M-1 30	70	65/20.0		10/50		25.16		0.56		1340		65		90/40		40/74		0.24		1118		0.51	1640
XB37M-1 40	95	65/20.0		10/50		34.00		0.54		1810		90		90/40		40/74		0.23		1548		0.54	2250
DHW: Capacity examples												HE: Capacity examples										Total (winter)
XB37M-1 30	70	65/20.0		10/50		25.16		0.56		1340		10		70/30		30/35		0.05		215		0.67		1350
XB37M-1 30	70	65/20.0		10/50		25.16		0.56		1340		16		70/30		30/35		0.13		344		0.53		1750

Danfoss Redan A/S · District Heating · Omega 7, Søften · DK-8382 Hinnerup · Denmark

Tel.: [phone] · Fax: [phone] · [e-mail] · www.redan.danfoss.dk

© Danfoss | DHS-SRMT/ PL | 2017 . 12

VL.HE.J2.02