Danfoss ECL 310 Application guide
Application guide
Cascade control of heat exchangers
District heating distribution station
Distribution station
Application
A district heating utility wants to build a
distribution station between the power
plant and a residential area.
The distribution station should be able to
supply approx. 100 residentials ~ 1 MW
capacity and be future-prepared to expand
the supply capacity when the residential
area grows.
The district heating utility wants to establish
the distribution station with 2 heat
exchangers (or more) instead of one big one
to achieve maximum efficiency and to
control the heat temperatures by means of
electronic controllers.
We recommend
• A362 application key
• ECL Comfort 310 controller
• ECL Portal
• Heat exchangers, XB71, brazed type
• AMV + AME actuators
• Motorized control valves (VS, VM, VB,
VFM...)
• Pressure independent control valves
(AVQM, AFQM)
For this application Danfoss has develop ed
the A362 application key.
Together with the ECL Comfort 310
controller it offers weather compensated
control of the flow temperature in a heating
circuit (residential area) based on advanced
cascade control of 2 heat exchangers (HEX).
Up to 6 heat exchangers can be cascade
controlled by 1, 2 or 3 ECL Comfort 310
controllers, each equipped with the
application key A362.
The ECL controllers are interconnected by
means of the ECL 485 Bus.
Control valve characteristics are taken into
consideration, and flow in unused heat
exchangers circuit can be stopped.
The ECL Comfort 310 controller can be
connected to the ECL Portal for remote
monitoring and control of the distribution
station.
With the ECL Portal it is possible to monitor
and control one or more ECL Comfort 310
controllers remotely from a pc or a smartphone app.
The ECL Portal is an effective tool for ser vice
personnel of district energy stations to
streamline service, commissioning,
maintenance and control tasks. Also, alarm
messages can be sent directly to users via
e-mails.
This internet-based SCADA solution requires
no local server and will automatically
configure its user interface and functionality
to support the application in the controller.
Heat exchangers to be chosen for this
application can be gasketed or brazed heat
exchangers with 1-pass or 2-pass. They are
available with both thread and flange
connections.
ECL Comfort 310 controller with key
Optional sliding return temperature
limitation. Scheduled shift for inversed
cascade (HEX-1 - HEX-2 and HEX-2 - HEX-1)
can be set.
Override inputs for start of HE X-1 and HEX-2
are available. M-Bus based signal can be
used for flow / energy limitation.
Alarm functions are related to flow and flow
temperatures.
In a 1-pass exchanger all connections are
placed on the same side thus making
installation very easy.
A 2-pass exchanger has connec tions on front
and back, and smalle r temperature difference
between primary and secondary side can be
obtained.
www.danfoss.com
Application example:
Application example: A362.1 cascade control with 2 heat exchangers
S1
System with 2 x HEX, each managed by means of one 0 - 10 Volt controlled motorized control valve (MCV) and one 3-point controlled MCV with position feedback. Each HEX circuit has its own circulation pump, but a common circulation pump can be used.
Additional accessories and options
V1
S5
M1
S12 (0 - 10 V)
V2
S6
M2
S13 (0 - 10 V)
ECL 310
+ ECA 32
S3
S4
S9
S10
87H1757.10
S7
A1
P1
O1
P2
O2
S15
S8
S16
S2
V3 (0 - 10 V)
Danfoss
AMV + AME actuators
AMV and AME actuators are primarily
designed to regulate valves in the
respond to the demand of a controller in
e.g. district heating, district cooling and
HVAC systems.
They can be controlled by electronic
Other features:
• High temperature resistance
• Easy mechanical and electrical
connection
• Robust design
controllers with modulating or 3-point
control output.
Actuators have built-in thermic and
overload protection of the electro
motor. This radically reduces the risk of
AMV + AME actuators are mostly used
with VS, VM, VB and VFM valves or with
pressure independent valves AVQM
and AFQM.
operational failure in either the valve or
the system as a whole.
Electric actuator AMV/AME 65x
Feel free to contact us or visit www.heating.danfoss.com or https://store.danfoss.com for further information about Danfoss Heating products.
© Danfoss | DHS-SMT/DK | 2018.07
VA.LV.A1.02
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