Insulation Of The Pump In Heating Systems; Insulation Of The Pump In Systems With Condensate Formation - Wilo Stratos PARA/-Z Serie Notice De Montage Et De Mise En Service

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• Protect the pump against rain.
• The minimum ambient temperature should not fall below the freezing point of the fluid
nor should it be lower than -20°C.
• The fluid and ambient temperature should not exceed or fall below the permissible val-
ues (see chapter 5.2).
• Carry out all welding and soldering work prior to the installation of the pump.
CAUTION! Risk of material damage!
Contamination from the pipe system can destroy the pump during operation. Before
installing the pump, flush the pipe system.
• It is recommended to install check valves in front of and behind the pump.
• When installing in the feed of open systems, the safety supply must branch off upstream of
the pump (DIN EN 12828).
• Perform assembly so that the pump shaft is horizontal and not under strain (see the
installation positions shown in Fig. 2a/2b).
• Make sure that it the pump is installed in a permissible installation position and with the
correct flow direction (compare with Fig. 2a/2b). The flow direction symbol on the pump
housing indicates the direction of flow.

7.1.1 Insulation of the pump in heating systems

Thermal insulation shells (optional accessories) are only permissible in heating applica-
tions with fluid temperatures starting from +20°C, since these thermal insulation shells
are not diffusion-proof when enclosing the pump housing. Install a thermal insulation
shell before commissioning the pump:
• fit the two half-shells of the thermal insulation and push them together so that the
guide pins engage in the opposing holes.
WARNING! Risk of burns!
Depending on the pump or system operating conditions (fluid temperature), the entire
pump can become very hot.
When retrofitting the insulation during normal operation there is a risk of burns.

7.1.2 Insulation of the pump in systems with condensate formation

The pumps of the Wilo-Stratos PARA series are suitable for use in air-conditioning, cooling,
geothermal energy and other similar systems with fluid temperatures down to -10°C. Con-
densate can form on parts that come into contact with the fluid, such as pipes and pump
housings.
• A diffusion-proof insulation must be provided onsite for application in such systems
(e.g. Wilo-Cooling-Shell).
CAUTION! Risk of material damage!
If the diffusion-proof insulation is fitted onsite, the pump housing of the Stratos PARA
1-8, 1-11, 1-12 pumps should only be insulated up to the motor's separation joint. The
condensate drain grooves must remain unobstructed to ensure that condensate that
develops in the motor can drain without problems (Fig. 3). Condensate that accumu-
lates in the motor can cause an electrical defect.
• Condensate cannot form on the inside of Stratos PARA 1-5, 1-7, 1-9, 1-11.5 pumps due
to the special design of the motor.
• To protect against corrosion, the pump housings of all Stratos PARA pumps are provided
with a cataphoresis coating.
36 WILO SE 02/2015