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Antifreeze protection for installation locations
prone to frost
The antifreeze function of the heat pump controller is active
whenever the controller and the heat circulating pumps are ready
for operation. If the heat pump is taken out of service or in the
event of a power failure, the system has to be drained. The heat-
ing circuit should be operated with a suitable antifreeze if heat
pump systems are implemented in buildings where a power fail-
ure can not be detected (holiday home).
The integrated expansion vessel has a volume of 24 litres. This
volume is suitable for buildings with a living space area to be
heated of maximum 200 m².
The volume should be checked by the heating system techni-
cian. If necessary, an additional expansion vessel must be in-
stalled (according to DIN 4751, Part 1). The tables listed in the
manufacturers' catalogues simplify dimensioning the system on
the basis of the water content.
ATTENTION!
In the case of large-volume heating circuits, an additional expansion
vessel must be used to supplement the installed expansion vessel (24
litres, 1.0 bar admission pressure).
7.3 Heat Source Connection
The following procedure must be observed when connecting the
heat source:
Connect the brine pipe to the heat pump flow and return.
The hydraulic plumbing diagram must be adhered to.
The dirt traps and micro bubble air separator included in the
scope of supply must be inserted in the brine inlet of the heat
pump by the customer.
The brine liquid must be produced prior to charging the system.
The liquid must have an antifreeze concentration of at least 25 %
to ensure frost protection down to -14 °C.
Only monoethylene glycol or propylene glycol-based antifreeze
may be used.
The heat source system must be de-aerated and checked for
leaks.
ATTENTION!
The brine solution must contain at least a 25 % concentration of a
monoethylene glycol or propylene glycol-based antifreeze, which must
be mixed before filling.
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7.4 Electrical Connection
The following electrical connections need to be established on
the heat pump.
The mains cable must be connected to the control panel of
the heat pump.
The control voltage cable must be connected to the control
panel of the heat pump.
All electrical components required for the operation of the heat
pump are located on the control panel.
For detailed instructions on how to connect the external compo-
nents and how the heat pump controller functions, please refer to
the device connection diagram and the operating manual sup-
plied with the controller.
The mains cable is connected via the terminals X1: L1/L2/L3/PE
on the control panel.
An all-pole disconnecting device with a contact gap of at least 3
mm (e.g. utility blocking contactor or power contactor) as well as
a 3-pole circuit breaker with common tripping for all external con-
ductors have to be provided by the customer. The required con-
ductor cross section is to be selected according to the power
consumption of the heat pump, the technical connection require-
ments of the relevant electrical utility company as well as all ap-
plicable regulations. Details on the power consumption of the
heat pump are listed on both the product information sheet and
the type plate. The connection terminals are designed for a max.
conductor cross section of 10 mm².
ATTENTION!
Observe the clockwise rotating field when connecting the electrical
mains cable (if rotating field is not clockwise, the heat pump will not work
properly and will be very noisy).
Connection of the control voltage via terminals X1:L/N/PE.
If a brine pump is required which is more powerful than the inte-
gral brine pump, a motor contactor and a corresponding motor
circuit breaker must be installed. In such cases, the contactor is
to be connected to the terminals for the internal brine pump (con-
troller terminals J12/N03 and X1-N). The larger pump must then
be supplied by the supply network.
7.4
E-5
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