Danfoss VX Solo 22 Fact sheet

Fact sheet

VX Solo 22

District heating substation for small properties and apartment houses

FEATURES AND BENEFITS

• Indirect heating

• Connection pipes for DHW cylinder

• Supplied with Danfoss ECL 310, prepared
for WebAccess

• 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 VX Solo 22 is made in a compact design
and is especially suitable for supply of heat­ing for small properties and apartment hous­es. The substation is suitable for two pipe
systems.
The substation features a plate heat exchan­ger for the heating circuit and it is prepared
for connection to a domestic hot water cy­linder.
The VX Solo 22 is available in two basic vari­ants, - one variant with Danfoss ECL 310 for
control of the heating circuit, and another
variant with Danfoss ECL 310 for control of
both the heating as well as the DHW cylinder
circuits.
The VX Solo 22 variants offer capacities ran­ging from 44 to 110 kW heating and 13 to 75
kW domestic hot water. Please contact our
sales department and together we shall find
the optimum solution for your exact require­ments.

Construction

The VX Solo 22 is supplied with a brazed
plate heat exchanger for heating, electronic
actuator(s) and valve(s), safety valves, pump,
shut-off valves, mano- and thermometers,
strainers, sensor pockets, differential pres­sure controller as well as connections pipes
for DHW cylinder.

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 VX Solo 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 VX Solo 22 can be supplied with a whi­te-lacquered steel cover with door, which
enables easy access for meter reading and
service purposes.

Connection pipes for domestic hot water
cylinder (DHW)

As standard the VX Solo 22 is supplied with
primary connection pipes for DHW cylinder,
with or without actuator and electronic con­trol of the cylinder circuit.

• Excellent operating economy

Heat exchanger for DHW heating

The heat exchanger used in the VX Solo

22 is a brazed, highly efficient Danfoss plate heat
exchanger, which has been tested and appro­ved according to the PED-directive.

Reading and setting

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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CIRCUIT DIAGRAM  EXAMPLE

P, M and S
refer to the
Danfoss ECL
instruction
manual

Cylinder
Supply

Cylinder
Return

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

1 Plate heat exchanger HE
4 Differential pressure controller
5 Strainer
6 Non-return valve
7 Ball valve
8 Pump HE
9 Connection for pump (circ.)
11 Safety valve, HE
13 Thermometer
14 Manometer w/shut-off valve

HE
Supply

HE
Return

Connections:

1. DCW inlet 5. DH return

2. DHW 6. HE supply

3. DCW outlet 7. HE return

4. DH supply

Options:

• White cover

• Ball valves

• Mounting of heat meter

• Pipe set with 7 pipes

• Pipe set with 4 pipes

• Circulation set

• Electrical control box

• Room thermostat TP 7000

• Insulation of pipes

• W/o cold water pipe

15 Manometer
17 Air valve
19 Drain valve/connection for
expansion vessel
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

DHW: Capacity examples with electronic control, ECL 310, A230 Connection for cylinder Tot al (winter)

Plate heat

exchanger

XB 37M-1 3 0 44 70/40 35/60 0.45 1257 20 - 0.75 1450
XB 37M-1 4 0 60 70/40 35/60 0.65 17 09 50 - 0.72 2630
XB 37M-1 5 0 75 70/40 35/60 0.40 2129 30 - 0.76 2350

XB 37L-1 40 37 70/46 45/57

XB 37L-1 20 15 70/31 30/35
XB 37M-1 4 0 75 90/45 40/ 74 0.54 14 63 - 30 0.68 1540
XB 37M-1 50 110 90/45 4 0/74 0. 57 2107 - 45 0.73 2250

1) Incl. differential pressure controller, (excl. heat meter), 2) Total flow calculated at 70% of the heating capacity + 100% DHW at 60/40°C and 65/40°C.

3) Example of substation for one-pipe system, 4) Floor heating.

Capacity

kW

HE circuit

Primary

°C

HE circuit

Secondary

°C

3

4

Pressure loss

Primary

1

bar

0.29 1348 30 - 0.67 1800

0.82 324 50 - 0.44 1660

Flow

Primary

l/h

DH supply 60° C

© Danfoss | DHS-SRMT/ PL | 2017 . 12

Yde lse, k W

DH supply

65° C

Pressure loss

Primary

2)

total

bar

Primary

total

VL.HE.L2.02

Flow

2)

l/h