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LSA 60TUR
Minimum heating water flow rate
The minimum heating water flow rate through the heat pump
must be assured in all operating states of the heating system.
This can be accomplished, for example, by installing either a dual
differential pressureless manifold or an overflow valve. The pro-
cedure for setting an overflow valve is described in the chapter
"Commissioning". When the minimum heating water flow rate is
undershot, the plate heat exchanger in the refrigeration circuit
can freeze, which can lead to total loss of the heat pump.
The nominal flow rate is specified depending on the max. flow
temperature in the device information and must be taken into ac-
count during planning. With design temperatures below 30 °C in
the flow, the design must be based on the max. volume flow with
5 K spread for A7/W35.
The specified nominal flow rate (See “Device information” on
page 10.) must be assured in all operating states. An installed
flow rate switch is used only for switching off the heat pump in the
event of an unusual and abrupt drop in the heating water flow
rate and not to monitor and safeguard the nominal flow rate.
Frost protection
On heat pump systems where protection from frost cannot be
guaranteed, there must be an option for draining the system (see
figure). The frost protection function of the heat pump manager is
active whenever the heat pump manager and the heat circulating
pump are ready for operation. The system must be drained if the
heat pump is taken out of service or in the event of a power fail-
ure. The heating circuit should be operated with a suitable frost
protection if heat pump systems are implemented in buildings
where a power failure can not be detected (holiday home).
7.3 Heat source connection
The following procedure must be observed when making the
connection:
Connect the brine pipe to the heat source flow and return of the
heat pump.
The hydraulic integration diagram must be adhered to.
The brine must be produced prior to charging the system. The
brine concentration must be at least 25 %. This guarantees frost
protection up to approx. -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 must contain at least a 25 % concentration of a monoethylene
glycol or propylene glycol-based antifreeze, which must be mixed before
filling.
ATTENTION!
If necessary, the operating range can be extended to a brine inlet
temperature of -10 °C. In this case, the minimum brine concentration
must be adjusted to 30 %. (Freezing temperature -17 C°).
ATTENTION!
The maximum test pressure in the heating circuit and the brine circuit is
6.0 bar. This value must not be exceeded.
ATTENTION!
A suitable de-aerator (micro bubble air separator) must be installed in the
heat source circuit by the customer.
