The document describes the FriWa fresh water module from PAW GmbH. It provides specifications for the module including its performance characteristics for different warm water temperatures and flow rates. The module uses a highly efficient stainless steel plate heat exchanger and integrated regulation. It is a compact pre-assembled solution that can heat water on demand without needing a storage tank, making it suitable for various building types connected to solar or other heating systems.

1. 122
04/2007
PAW GmbH & Co. KG
phone: +49-5151-9856-0, fax: +49-5151-9856-98
Performance characteristics of the FriWa module, for cold water entry temperature = 10 °C
warm water tap potential of 45°C transmission primary flow temperature primary return
temperature warm water at the temperature necessary temperature
set preset warm water
temperature
45°C 21 l/min 50 kW 50,0 °C 23°C
45 l/min 110 kW 75,0 °C 15°C
55°C 24 l/min 61 kW 60,0 °C 27°C
40 l/min 103 kW 75,0 °C 19°C
Fresh Water Module “FriWa”
Your advantages:
Connections:
primary circuit 3/4’’ female, potable water circuit 1’’ male, circulation line
(optional) 3/4’’ male
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 return pipe of the primary circuit,
manual opener, 200 mm WC, prevent any gravity circulations; inside the
circulation line (optional) located before the pump
Potable water circuit with piston valves
easy handling, ball valves inside the primary circuit key-activated
With solar circulation pumps by WILO
pre-assembled and prewired,
completely isolatable
no emptying necessary for servicing
Flowmeter on the cold water supply
for electronic measurement of the flow rate and heat measurement.
Circulation pump (optional) for maximum comfort
event-driven (depending on the needs), time- or temperature-driven
Flushing unit integrated on the potable water side
two drain valves (on the elbow unions on the heat exchanger) permit flushing
the heat exchanger. On the primary side with deculator on the topmost
point on the heat exchanger and drain valve for the emptying of the heat
exchanger.
The compact and completely pre-assembled station heats water in a comfortab-
le and hygienic way only when it is needed. The warm water is heated up only
at the moment it is needed – quickly, safely and cleanly – so that fresh warm
hygenical water is available at any time withour having to use a warm water
storage tank. The energy necessary for the heating of potable water comes
from a buffer storage which acn be heated via various systems: solar systems
as well as solid combustibles, traditional oil or gas boilers or other systems.
The FriWa module is suited very well for the application in connection with a
solar thermal installation and/or a low-temperature heating system thanks to
the low primary temperatures necessary.
outlet warm
warm
primary circuit
inlet
cold
water
return
circulation
primary
circuit
return
accessories
see page
146-149
Solex

2. 123
04/2007
PAW GmbH & Co. KG
phone: +49-5151-9856-0, fax: +49-5151-9856-98
Fresh Water Module “FriWa”
Hydraulic scheme FriWa
Highly efficient stainless steel plate heat exchanger
especially long, designed for low-flow operation, generous-
ly dimensioned, for the transfer of high power outputs
with slight temperature differences, permits a low primary
flow and return temperature, completely integrated into
the insulation.
High tap potential until 45 l/min
Like this, the FriWa module has various fields of application
as for example in detached houses, houses for several
families, sporting facilities, nursing homes etc.
Safety valve 10 bar
on the potable water side
Integrated regulation
completely pre-assembled, preset and prewired. The tem-
perature- and flow rate-depending speed control of the
primary pump permits a quick and precise adjustment of
the preset water temperature.
The circulation pump (optional) can be operated on de-
mand (by tap impulse) time- or temperature-depending.
Additionally, it is possible to pilote a three-way reversing
valve (not included in the delivery). This way, very warm
primary return water (evolving during the operation of the
circulation pump or during phases of low tap potentials)
can be returned to the buffers torage on a higher level so
that the colder, lower part of the buffer storage remains.
The integrated heat quantity survey permits a simple
overview over the energy needed for the preparation of
the warm potable water.
TECHNICAL DATA FriWa
Dimension DN 20 - 3/4“
Material fittings brass / red brass
gaskets Klingersil / EPDM
insulation EPP
check valves modified PPS
heat exchanger plates + sockets: 1.4400
solder: 99,99% copper
Techn. Data max. pressure 10 bar
max. temperature 130 °C, temporarily 160 °C
Equipment safety valve 10 bar, for potable water
primary pump 25 - 90 Watt
circulation pump 38 Watt (optional)
heat exchanger 30 plates, type 1P
Measurements connections primary circuit: 3/4“ female
potable water circuit:
1“ male, flat sealing
optional: circulation pipe: 3/4“ male
flat sealing
over-all width 560 mm
over-all height 880 mm
Advantages
• No warm water storage
necessary
• Tap potential of up to 45 l/ min
• optimum cooling
of the heating water
• compact design
• plug-in solution
• The FriWa module offers
different operational modes
of the circulation
• low primary flow temperature
of 50 °C suffices for the
preparation of 45°C warm water
• heat quantity survey
of the warm water consumed
Benefits
• Warm water is always fresh
and hygienical
• multiple fields of application:
detached houses, houses for
several families, sporting facilities,
nursing homes etc
• particularly suitable for the
application in heating installations
with solar thermal systems
• can be integrated easily into
existing heating systems with
buffer storage
• simple assembly and installation
• optimum adaption to the
different user’s demands
• optimum incorporation into low
temperature heating systems and
solar systems
• simple overview of the need of the
energy needed for the preparation
of the warm potable water
Fresh Water module by PAW
Solex
SIpump version Item n°
640 4630 WIZ
640 4630 WI
primary: Wilo RS 15 / 6-3, with circulation connection and pump Wilo Z20 / 1
primary: Wilo RS 15 / 6-3, without circulation pump, connection 1’’ male with tap
640 413
Circulation set, for fresh water module without circulation pump,
with pump Wilo Star-Z 20/1, insert stop and valve, 1“ male
Accessories are storage items; dispatch usually 2 days after order processing