Maico EW-S Montage- Und Betriebsanleitung Seite 41

● A corresponding bleeding screw/valve must
be planned at the highest point of the
system.
The distributor and safety fittings are to be
installed at a suitable location.
● The system is operated at a maximum
operating pressure of 1.5 bar. The resultant
change in volume experienced by the heat
carrying medium, between approx. 0.8 and
1 % of the system volume, should be
compensated for with an expansion tank
membrane in accordance with DIN 4708.
● To prevent overfilling, a component-tested
safety valve should be fitted.
● A pressure gauge with min. and max.
pressure marks should be fitted for
pressure monitoring.
● The system should only be filled with
the correct glycol mixture. A 25 % glycol-
water mix is recommended (corresponds to
a value down to -15 °C. See EW-G
Glykosol accessory in the valid catalogue
or Internet.
● The ground collectors are to be rinsed to
ensure they are completely free of air. A
pressure test with a 1.5 value must be
carried out over the whole system before
commissioning. The function of all
components must be checked and the test
certificates are to be given to the operator.
Installation instructions
● Ground collectors may not be built on top
of. The surface above the collectors may
not be sealed.
● PE-HD ducts must be protected from stone
loads and must therefore be back-filled with
sand. The sand bed must be at least 0.4 m.
● Permissible bend radii depend greatly on
the temperature at the time of laying.
PE-HD 32 x 2.9: 20 °C → 0.7 m,
10 °C → 1.2 m, 0 °C → 1.7 m
● The number of circuits and/or the complete
duct lengths is dependent on the
performance and/or the volumetric flow
(→ table, Chapter 8.8).
Approvals required (VDI 4640 Sheet 1)
● In accordance with § 3 Paragraph 3 No.2
Letter b of the Federal Mining Act,
geothermal power is considered equal to
natural resources free for mining.
● When planning, building and operating
power generation plants for making thermal
use of underground areas, the rules
governing water rights and state planning
objectives must be observed.
● The clauses of the Water Resources Act
(WHG) apply in conjunction with state
water legislation and administrative rules
these involve.
● DIN 4708 Central warm water heating
systems.
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