The document describes the Solex-LF solar water heating system. It has fully assembled flat sealing union connections and ball valves. It comes with pre-assembled and pre-wired solar circulation pumps by Wilo. The compact and preassembled system is insulated and equipped with a generously sized double-column heat exchanger and preset controller for simple installation. It is available with either a 21 or 45 plate stainless steel heat exchanger, for smaller or larger systems respectively.

1. 116
04/2007
PAW GmbH & Co. KG
phone: +49-5151-9856-0, fax: +49-5151-9856-98
basic conditions: global radiation = 800 W/m²; efficiency ␩ 0,05
= 0,625
For systems in high flow mode [15 l/(m2
solar panels x h)]
Heat exchanger type 2P
with 21 plates operational mode surface of solar panels performance
15 l/(m2
*h) 30 m2
15 kW
Heat exchanger type 2P
mit 45 plates operational mode surface of solar panels performance
15 l/(m2
*h) 50 m2
25 kW
Solar water heating system Solex – LF
Your advantages:
All connections 3/4’’ female
With pre-assembled steel wall brackt
can be mounted easily onto the wall
Fully assembled with flat sealing union connections
Full port ball valves
Flow check valve inside the solar circuit and
inside the secondary circuit, manual opener, inside
the solar circuit with 400 mm WC, especially for solar
systems, secondary with 200 mm WC, prevent any gravity
circulations
Solar circuit with large ball valve handles
easy handling, visible closing position, with integrated
full metal thermometer 0-160 °C, can be pulled off, with
thermowell integrated inside the ball valve, ball valves inside
the secondary circuit key-actuated
With solar circulation pumps by WILO
pre-assembled and prewired; aligned to the performance
of the water heating system, pumps are completely isola-
table- no draining necessary during pump service
Primary side with flow meter
for electronic measurement of the flow rate and heat
measurement.
Integrated flushing and filling unit
two drain valves (on the elbow unions on the heat ex-
changer) permit filling and flushing the primary circuit as
well as only the heat exchanger. On the secondary side with
deculator on the topmost point on the heat exchanger and
drain valve for the emptying of the heat exchanger.
for low flow systems
The compact and completely preassambled solar water
heating system Solex for high flow systems is completely
insulated. It is equipped with a generously dimensioned
double-column heat exchanger, a prewired and preset con-
troller. All those advantages allow for a simple and quick
assembly as well as for secure commissioning.
Solar/Primary circuit
accessories
see page
146-149
Secondary circuit
flow
Secondary circuit
return
Solex

2. 117
04/2007
PAW GmbH & Co. KG
phone: +49-5151-9856-0, fax: +49-5151-9856-98
pressure[mWC]
pressure[kPa]
Pressure drop Solex LF secondary circuit / pump characteristic curve
Flow rate [l/h]
Pressure drop 45 plates
heat exchanger
Pressure drop 21 plates
heat exchanger
pressure[mWC]
pressure[kPa]
Pressure drop Solex LF primary circuit / pump characteristic curve
Flow rate [l/h]
Pressure drop 45 plates
heat exchanger
Pressure drop 21 plates
heat exchanger
Solar water heating system Solex – LF
Solar safety assembly
pressure relief valve 6 bar, high-temperature manometer 0-6 bar with valve,
flat sealing connection for expansion tank secondary side with 3 bar
pressure relief valve
Compact function-optimised design insulation
made of durable elastic EPP; 100% insulation of the fittings – minimised
heat loss
Highly efficient stainless steel heat exchanger
two sizes for small and larger installations, designed for low flow operation.
Generously dimensioned, for transmitting high performances with low tem-
perature differences, completely integrated into the insulation.
Integrated solar controller
completely pre-assembled, preset and prewired, assures quick assembly – only
the sensors for the storage tank and for the solar panels have to be assem-
bled and branched. The preset control system permmits a simple and clean
commissioning. The temperature-depending speed control of the primary and
secondary pump ensures the optimum use of the energy gained.
Integrated 3-way reversing valve
permits the optimum stratification of the energy gained in two buffer storages
or a stratified storage.
for low flow systems
Solex
TECHNICAL DATA Solex - LF
Dimension DN 20 - 3/4“
Material fittings brass
gaskets Klingersil / EPDM
insulation EPP
check valves modified PPS
heat exchanger plates + sockes: 1.4400
solder: 99,99% copper
Techn. data max. pressure 10 bar
max. temperature 130 °C, temporarily 160 °C
Equipment check valves 400 mm WC primary
200 mm WC secondary
safety valve 6 bar, for thermal solar systems
3 bar, für for heating sytems
manometer 0 - 6 bar, resistant to high
temperatures
thermometers 0 - 160 °C inside the solar circuit
Measurements connections 3/4“ female
over-all width 660 mm
over-all height 880 mm
SIPump version Item no
6091821 GS
6091845 GS
primary: Grundfos Solar 15 - 80; secondary: Grundfos UPS 15 - 40
primary: Grundfos Solar 15 - 80; secondary:Grundfos UPS 15 - 40
Heat exchanger
Type 2P
21 plates
Type 2P
45 plates
Hydraulic scheme
with 2 storages
Hydraulic scheme
with stratified storage
Accessories are storage items; dispatch usually 2 days after order processing