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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
procedure for setting an overflow valve is described in the
chapter "Commissioning". When the minimum heating water
flow 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
account 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 16.) must be assured in all operating states. A built-in flow
rate sensor 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 for monitoring and fusing the nominal flow rate.
NOTE
The use of an overflow valve is only recommended for panel
heating and a maximum heating water flow of 1.3 m³/h.
System faults may result if this is not observed.
Frost protection
A method of manual drainage (see illustration) should be pro-
vided for heat pumps which are exposed to frost. The frost pro-
tection function of the heat pump manager is active whenever
the heat pump manager and the heat circulating pump are
ready for operation. In the event of decommissioning or power
failure, the system must be drained and, if necessary, blown out
at the points shown (see illustration). For heat pump systems
where a power failure cannot be detected (holiday home), the
heating circuit must be operated with suitable non-toxic anti-
freeze (such as polypropylene glycol) added at the concentra-
tion specified by the antifreeze manufacturer.
1
2
Fig. 6.3:
CAUTION!
Swallowing or contact with glycol and glycol mixtures. Risk of
poisoning!
When using glycol and glycol mixtures, the valid national
and regional regulations on environmental protection,
water protection and worker protection must be
observed.
Workers must be instructed in the dangers and risks
associated with glycol and glycol mixtures.
In Germany, operating instructions in accordance with
§14 of the Ordinance on Hazardous Substances
(GefStoffV) must be created. Otherwise, country-specific
regulations must be observed.
EN-12
6.5 Electrical connection
6.5.1 General
All electrical installation work must be carried out by a trained
electrician or a specialist for the specified tasks in accordance
with the
installation and operating instructions,
country-specific installation regulations (e.g. VDE 0100),
technical connection conditions of the energy supplier
and supply grid operator (e.g. TAB) and
local conditions.
To ensure that the frost protection function of the heat pump
works properly, the heat pump manager must remain con-
nected to the power supply and the flow must be maintained
through the heat pump at all times.
The switching contacts of the output relay are interference-
suppressed. Therefore, depending on the internal resistance of
the measuring instrument, a voltage can also be measured
when the contacts are open. However, this will be much lower
than the line voltage.
Controller terminals -N0/J2..J15; -N1/J1..15, J25 and J26 or
the LV adapter boards are connected to extra-low voltage. If,
due to a wiring error, the line voltage is mistakenly connected to
these points, the controller will be destroyed.
452170.66.01-EN · FD 0303
LI 1422C - 1826C
www.dimplex.de
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