B. Opening the front door
1.
Loosen the three upper screws [6] behind the
front door [5].
6
5
2.
Then tilt the front door [5] forward and
remove it carefully.
5
4.5 For connection to the brine
cycle
When establishing the connection, proceed as fol-
lows:
n
Flush the pipe system thoroughly before con-
necting the heat pump to the heat source cir-
cuit. Foreign bodies such as rust, sand and
sealing material impair the operational safety of
the heat pump.
n
Connect the brine line to the heat pump’s flow
and return flow heat source.
n
Observe the hydraulic diagrams.
NOTICE!
A dirt trap must be installed in the heat source
inlet of the heat pump to protect the evaporator
against contamination.
In addition, a micro-bubble separator must be
installed in the heat source system.
Brine filling
The brine must be produced before the system is
filled.
The brine volume in the heat pump under oper-
ating conditions can be found in the data table (see
“Technical Data”).
The total volume corresponds to the required brine
quantity to be mixed from undiluted ethylene glycol
and water. The chloride content of the water shall
not exceed 300 ppm.
The brine concentration must be at least 25%. This
guarantees frost resistance down to -13 °C. Only
monoethylene glycol-based antifreeze must be
used. The heat source system must be bled and
checked for leaks.
Mixing ratio
The brine concentration varies when using a
ground collector or a geothermal probe as a heat
source. Refer to the table below for the mixing
ratio.
Ethylene
glycol
Water
Anti-
freeze
protection
Geo-
thermal
probe
25%
75%
- 13 °C
Soil
collector
33%
67%
- 20 °C
27