8
1 unit undiluted ethylene glycol with
2 units water (max. chloride contents in the
water = 300 ppm), then fill mixture into the
system.
Check the brine concentration:
Determine the density of the ethylene glycol
water mixture (e.g. with a hydrometer). Using
the actual density and temperature, you can
check the actual concentration in the diagram
(Fig. 10).
!
The quoted details refer to ethylene
glycol. The output details deviate
slightly from those stated when using
propylene glycol (see “Specification”).
To prevent the transmission of noise, connect
the heat source circuits to the heat pump
with flexible pressure hoses (for part no. see
section 2 “Special accessories”).
1.6.3.3 Checking the flow rate
(to be implemented during the heat pump
commissioning)
Measure the flow and return temperatures
of the heat source. For this, determine the
temperature differential by measuring the
temperature under the thermal insulation on
both flow and return pipes of the heat pump.
The diagram (Fig. 9) shows the temperature
spread at the rated volume flow.
!
At the WPM II, adjust parameter 12
(source) in the commissioning list to
“Ethylene glycol”, otherwise the frost
protection limiter would switch OFF the
heat pump at temperatures below 7 °C.
You can check the source inlet temperature
on the WPM II display under system
parameter INFO TEMP.
1.6.4 Installation of the heat consumer system
1.6.4.1 Install the heat consumer system
(heating circuit)
in accordance with current
technical guidelines. For safety equipment on
the heating system, consult DIN 4751 page 2 or
local regulations.
Prior to connecting the heat pump, check the
heating system for leaks, flush it thoroughly,
fill and carefully vent it.
When filling the system with heating
water, observe VDI 2035, sheet 1 [or local
regulations]. In particular, this means that
z
during the service life of the system, the
total of the fill and top-up water must not
exceed three times the nominal volume of
the heating system,
z
the total alkaline earths in the water must
be < 3.0 mol/m³,
z
the total water hardness must be
< 3 mmol/l , and
z
soften the water, if the above conditions
cannot be met.
Generally soften the heating water, if the
specific system volume > 20 l/kW output
(e.g. systems with buffer cylinder).
Check the correct connection of heating flow
and return (Fig. 3 and 9). The reduction of
structure-borne vibrations on the water side
requires the installation of flexible pressure
hoses (for part no. see “Special accessories”).
Fit the thermal insulation in accordance
with local regulations appertaining heating
systems.
1.6.4.2 Buffer cylinder
A buffer cylinder is recommended to ensure
trouble-free heat pump operation. The buffer
cylinder provides hydraulic separation of the
volume flow in the heat pump circuit and the
heating circuit.
The flow rate in the heat pump remains
constant if, for example, the flow rate in the
heating circuit is reduced by thermostatic
valves.
1.6.4.3 Circulation pump (cylinder primary
pump)
When using a buffer cylinder SBP 200 and the
heat pump compact installation WPKI 5, select
and install the circulation pump in accordance
with the installation instructions for the
WPKI 5.
The total pressure drop is the sum of the
pressure drop values for the heat pump, the
interconnecting lines and the WPKI 5.
1.6.4.4 Circulation pump (heating circuit pump)
Where no buffer cylinder is used, size
the circulation pump on the heating side
taking the condenser pressure drop into
consideration. Safeguard the nominal flow
rate of the heat pump (see table below) under
all operating conditions of the heating system
by installing an overflow valve.
1.6.4.5 Second external heat source
For dual-mode heating systems, always
connect the heat pump into the return of the
second heat source (e.g. oil fired boiler).
High heating water temperature:
In dual-mode heating systems, the return
water from the second heat source can
flow through the heat pump, immediately
after it has been switched off, with a max.
Temperature of 60 °C.
The temperature may be 70 °C no earlier than
ten minutes after shutdown.
Pressure differentials and nominal flow rates
Heat pump type
WPF..M(S)
7
10
13
16
Nominal volume flow
m³/h
0.7
0.9
1.2
1.5
Heat pump pressure differential
at nominal flow rate
hPa
58
58
62
40
Pressure differential of the compact installation WPKI 5
at nominal flow rate
hPa
30
32
34
40
Pressure differential of the connecting line 35x1.5
at nominal flow rate
hPa/m 0.8*) 0.9*) 1.0*) 1.3*)
*) Values refer to straight pipe runs. Bends, valves, heat meters etc. must additionally be taken
into account.
C26_03_01_0143
Fig. 9
1
2
3
4
5
6
-5
0
5
10
15
20
Quelleneintrittstemperatur [°C]
T
em
p
er
a
tur
d
iff
er
e
n
z
[K
]
Sole - HV 35°C
Sole - HV 50°C
Temperature spread at rated volume flow
Source inlet temperature
Temper
a
tur
e di
ff
er
en
tial
Brine
Brine
