Connecting An Expansion Vessel (Provided By The Customer); Heat Transfer Medium; Backflow Preventer; Electrical Connection For Recirculation Pump - Meibes Solar XL Technische Information Für Montage Und Betrieb

3. Installation

3.4 Connecting an expansion vessel (provided by the customer)

Expansion vessel accommodate the changes in volume when heating or cooling the heat transfer fluid and retain a fluid
reserve to offset minor leakages. Only suitable and properly designed expansion vessel (see DIN 4807) are to be used. In
the event of relevant prevailing temperatures use any auxiliary vessels.

3.5 Heat transfer medium

Only use suitable and approved solar fluid with antifreeze (see DIN 4757), which
is suitable for solar systems! Note the manufacturer and type, because in some circumstances these cannot be mixed
with agents
from other manufacturers.

3.6 Backflow preventer

In the secondary circuit a backflow preventer is installed at delivery, which prevents uncontrolled circulation of the heating
medium and consequently counteracts any cooling of the tank.
Cracking pressure: 200 mm water column
When filling and flushing the system, note the direction of flow!

3.7 Electrical connection for recirculation pump

Hydraulic diagram – Solar XL + Energy Pro controller station
The following pumps are available in the separation system: The following pumps are available in the separation system:
Primary side - (solar)
• Grundfos UPM3 Hybrid 15-70 and 15-145
Wilo Yonos PARA ST 15/7 PWM and
•
15/13 PWM2
Secondary side - (heating)
• Grundfos UPM3 Hybrid 15-70
• Wilo Yonos PARA ST 15/7 PWM
32
Heat
exchanger
(connected
in factory)
RO1
Solar circuit
TS4
pump 1
(connected in
factory)
RO2
Heat
exchanger
pump
(connected
in factory)
TS1 Collector sensor 1
(installed by the customer)
TS3
TS2 Storage tank
sensor 1 lower
(installed by the customer)
Storage tank sensor 1
upper
(optional)