Frost Protection - iDM TERRA AL 60 Max Technical Documentation Installation Instructions

5. General description
Heating connections
Flexible hoses
Two fl exible hoses (about 30 cm) are available as
accessories and are factory insulated. They have to
be mounted to the fl ow and the return of the heat-
pump.

5.2. Frost protection

The hydraulic pipelines must be isolated expertly, and
they must be installed underneath the frost line.
For bivalent-alternative operating mode, or if longer
waiting periods could occur, in addition there is a frost
protection function for the outdoor unit. Falls the out-
door temperature below the antifreeze outside tem-
perature and the fl ow temperature of the heat pump
below the minimum temperature, the charge pump
starts, until the pipelines are again on temperature.
outdoor
TERRA AL
Basic scheme, only neccessary if an additional safety brine circuit is provided.
24
brine
Installation instructions TERRA AL 60 Max
If the heat pump should be still equipped with an ad-
ditional intermediate brine circuit, it must be ensured
that the charging pump (M73-1) and the additional
onsite pump (M73-2) may use the same driven signal.
(safety-heat exchanger, brine-pump and accessories
have to be provided on site)
The charge pump and the on site pump can be con-
nected in parallel and driven via the signal of the
charge pump. The fl ow switch B14 must be installed
on the heating water side in a horizontal position.
intdoor
P
heating water
FIL
M73-2
heat-pump
fl ow
heat-pump
return
P
FIL
M73-1 B14
(C) IDM Energiesysteme GmbH
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