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The control of the return temperature is handled by the HDG Compa-
tronic control.
The return temperature control consists of a 3-way mixing valve with
a 230 V servo drive (running time 120-240 s) and a circulation pump
from energy efficiency class A. We recommend for the
• HDG Compact 25/35/45/50: Wilo 30/1-6, 3-way mixer DN 32
• HDG Compact 65: Wilo 30/1-7, 3-way mixer DN 32
• HDG Compact 80: Wilo 30/1-8, 3-way mixer DN 40
(or comparable)
The hydraulic system must be installed in accordance with specific
technical principles of the heating construction industry. Take into
account the stop cocks required for maintenance work and repairs.
The return temperature control must be installed according to the
specifications of HDG Bavaria.
HYDRAULIC CONNECTION
There are hydraulic solutions for every application.
✎ An excerpt of the hydraulic solution options can be found in the
section “4.10 HDG hydraulic systems” in this chapter or in the in-
formation booklet “Hydraulic Solutions for the HDG Hydronic”.
The pipe dimensions must be adapted to meet the requirements at
the site. Take the water-side connections of the boiler for the supply
and return into account.
✎ See the chapter entitled “3 Mode of operation”, section
“3.3 Technical data”.
The use of a gravity brake is not intended for the return tempera-
ture control and should therefore not be installed.
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