8.3 Installation of the heat pump system
Design the heat source system for the brine/water heat pump in
accordance with Stiebel Eltron technical guides.
Permitted brine:
— Ethylene glycol
— Propylene glycol
— Heat transfer medium as concentrate part no.: 161696
—Heat transfer medium as ready-mixed solution part no.:
185472
When using the heat transfer medium with part no.: 185472, never
seal the heat source system with hemp.
8.3.1 Circulation pump and required flow rate
Use a circulation pump with compound-filled windings to supply
the brine, to prevent an earth short circuit through condensation
in the electrical part of the pump (cold water version).
Size the circulation pump in accordance with the system-specific
conditions, i.e. nominal flow rate and pressure drop must be taken
into consideration (see "Specification").
An adequate flow rate must be safeguarded at every possible
brine temperature, i.e.:
Size the nominal flow rate at brine temperature 0 °C with a
tolerance of + 10 %.
8.3.2 Connection and filling with brine
Prior to connecting the heat pump, check the heat source circuit
for possible leaks, and flush thoroughly.
Calculate the volume of the heat source circuit. You can obtain
the brine volume inside the heat pump from the "Specification"
table.
The overall volume equals that of the required amount of brine
that should be mixed
from 33 % by vol. undiluted ethylene glycol
and 67 % by vol. water.
Mix 1 unit of undiluted ethylene glycol with 2 units of water
(max. chloride content of the water 300 ppm) and then fill into
the system.
Check the brine concentration:
Determine the density of the ethylene glycol water mixture (e.g.
with an hydrometer). Using the density and temperature, the
current level of concentration can be checked in the diagram
(see
Fig. F)
.
F
Density U of ethylene glycol water mixtures of various
concentrations
C26_03_01_0833
{ = Frost protection
!
Risk of damage!
The quoted output details refer to ethylene glycol.
These output details vary slightly when using
propylene glycol.
www.stiebel-eltron.com WPF 20/27/40/52/66 | 9
INSTALLATION
INSTALLATION
1.130
1.120
1.110
1.100
1.090
1.080
1.070
1.060
1.050
1.040
1.030
1.020
1.000
0.990
0.980
1.010
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