Page 1
To p Info
Solar System Controls and Accessories
The SCU solar system control series offers
options for any type of system, from basic single-
load installations to complex multi-load systems
with demanding requirements. With their large
LCD displays, SCU controls are user-friendly and
provide industry leading solar system safety,
performance and effi ciency.
All controls incorporate variable speed pump
control, preprogrammed confi gurations, collector
glycol cooling function, heat rejection loop control,
energy meter and VBus accessories. The SCU
345 control also provides data logging to an
internal SD memory card, and an optional SEM
fl ow meter kit can be added for precise energy
metering or used as a standalone unit.
Page 2
Top In fo
e
N
SD
With SD card capabilities*, the
SCU345 control allows you to
view system data on your PC.
Adjustable logging intervals from
one second to 20 minutes.
w
Solar System Controls and Accessories
SCU 124/SCU 224 solar system controls for
basic single- and multi-load systems
The SCU 124 and SCU 224 solar system
controls are ideal for basic systems with
two semiconductor relay outputs and four
sensor inputs. The single-load SCU 124
control features three basic, preprogrammed
system confi gurations for easy planning and
installation. For basic multi-load systems or
east-west collector arrays, the SCU 224 control
is an ideal choice. It features an additional
delta-T for control of second relay, as well as
10 preprogrammed system confi gurations for
ultimate installation fl exibility.
SCU 345 solar system control for multi-load,
east-west and commercial arrays
The SCU 345 is an advanced solar system
control for multi-load systems, east-west
collector arrays and commercial solar systems.
This advanced solar system control features
four relay outputs and adjustable delta-T
and time controlled thermostat functions for
limitless confi guration possibilities. The SCU
345 control is compatible with a number of
system accessories designed for system
monitoring, analytics and additional control
.
SCU 124/SCU 224 Solar System Control
SCU 345 Solar System Control
w
e
N
e
N
V40 Flowmeter Kit includes two
sensors and two sensor wells.
For use with SCU 345 or SEM.
w
Control Section Guide
Model
Relay outputs 2 2 4
Variable speed pump
Sensor inputs 4 4 5
System confi gurations 3 10 9
Number of heat loads (tanks) 1 2 3
Number of differentials 1 2 3
Heat dissipater layout
Energy meter
Pump hour counter
Collector cooling
Night tank cooling
V-Bus accessories
Internal SD card _ _
Flowmeter option _ _
*Field supplied.
SCU 124 SCU 224 SCU 345
Page 3
Sample System Layout — with optional accessories shown
4
s
1
4
s
6
M
2
5 5
3
s
4 4 4
s
8 9
s
10
11
12
7
1
Vitosol solar collector
2
Solar-Divicon
3
V40 Flowmeter Kit
4
Temperature sensor
5
Vitocell solar tank
6
Motorized diverting valve
7
SCU 345 control
8
VBus/PWM Interface
9
Smart Display
10
Datalogger
11
Internet
12
PC
Solar Energy Meter
With input from the V40 Flowmeter and two system
sensors, the Solar Energy Meter (SEM) records the
energy yield and fl owrate produced by your solar
system. Heat quality calculations displayed on the
large screen are also stored in the internal memory
or transmitted to the Datalogger or PC using VBus
communication.
SCU Control Accessories
VBus/PWM Interface Adaptor allows for
control of a high effi ciency pump.
Smart Display shows collector and tank
temperature and energy production in
real time.
Solar Energy Meter
Datalogger stores 180 MB of operational
details. SD card* or ethernet for data
extraction.
w
e
N
*Field supplied.
Page 4
V40 Flowmeter Technical Data
®
Viessmann Manufacturing
Company Inc.
Waterloo, ON Canada
1-800-387-7373
www.viessmann.ca
Viessmann Manufacturing
Company (U.S.) Inc.
Warwick, RI U.S.A.
1-800-288-0667
www.viessmann.us
®
Flowmeter Sizing
Three Flowmeter Kit sizes available; fl owmeter must be sized to
match fl ow rate of system.
Flowmeter Model
Minimum fl ow rate
Maximum prac tical
fl ow rate
recommended
V40 -0 6 V40 -15 V40 -25
0.1
usgpm
2.4
usgpm
0.3
usgpm
5.3
usgpm
0.5
usgpm
9.7
usgpm
Maximum number
of Vitosol Fla t Plate
61424
Solar Collec tors
Maximum number
of Vitosol Vacuum
90 180 360
Tube Solar Collec tors
Pressure loss at
maximum
recommended
80“
w.c.
80“
w.c.
80“
w.c.
fl ow rate
Flowmeter Pressure Loss Curve
1 400
0.5 200
0.1 40
0.05 30
Pressure loss in bar
0.01
0.1
0.44
0.3
0.5
2.2
1.3
Flow rate
V40-06
1
4.4
13.2
3
V40 Flowmeter Kit
V40-15
V40-25
4
5 m³/h
22 usgpm
Pressure loss " w.c.
Technical information subject to change without notice.
9440 428 v1.0 08/12 Printed in Canada
Loading...