Danfoss SW 235/335, SW 242/342 Fact sheet

Fact sheet

SW 235/335 - 242/342

District heating substation for large properties

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 oneand 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.

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

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.

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Danfoss SW 235/335, SW 242/342 Fact sheet

CIRCUIT DIAGRAM – EXAMPLE - HW 335/342 WITH ECL 310, A266

DHW

DCW

Circ.

Supply

DH.

Return

2	Plate heat exchanger DHW	13	Thermometer
4	Diff. pressure controller	14	Manometer w/shut-off valve
5	Strainer	17	Air valve
6	Non-return valve	23	Sensor pocket for heat meter
7	Ball valve		(optional)
8	Pump HE	24	Fitting piece for heat meter,
9	Circulation pump, DHW		(optional)
10	Balancing valve, DHW	25	Controller Danfoss ECL310/A266
12	Safety valve DHW	26	Outdoor sensor
		27	Sensor forward/return
		28	Sensor, DHW
		29	Actuator 2
		30	Valve 2
		31	Actuator 1
	HE	32	Valve 1
	HE
	Supply	P, M and S refer to the Danfoss ECLinstruction manual

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)
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

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

Contact your local Danfoss sales representative for capacity examples

VL.IE.P2.02