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7
"Heat Exchanger" switch (hot-water heat pumps
with internal heat exchanger only)
When this switch is operated, external heat exchanger operation
is enabled, i.e. hot water can be prepared (e.g. in winter) using a
second heat generator (e.g. boiler, solar installation etc. - if the
necessary electrical connection is established at the heat pump).
Hot-water temperature is controlled using the hot-water heat
pump temperature controller.
Heat pump operation can be blocked as required if domestic hot
water is to be prepared using a second heat generator. This is
achieved by removing the factory-mounted copper bridge A2 (at
terminal strip X5, see Section 5.3) and integrating a floating con-
tact from the second heat generator regulation in the same posi-
tion. An external regulation must not lead to the maximum
switching frequency (12 operations/h) of the heat pump being ex-
ceeded. It may be necessary to take the local utility company
(EVU) specifications into consideration in this regard.
Relay for heat exchanger operation
Relay with a floating contact (hot-water heat pumps with internal
heat exchanger only) to control the ancillary devices (pump, so-
lenoid valve etc.) for operation with a second heat generator. The
relay contact is closed when the "Heat Exchanger" switch is acti-
vated and a hot water request from the hot-water heat pump tem-
perature controller is present.
Sensor pipe for external temperature sensors
A vertical sensor pipe
12mm (opening in the bottom plate
i
sealed with a leading-in tube) for an external heat sensor is fitted
in the rear of the hot-water heat pump and a cable feedthrough is
available in the rear panel.
External temperature sensor installation position
(device cover removed)
EN-8
7
Maintenance
ATTENTION!
Disconnect the power supply before opening the hot-water heat pump;
observe possible coasting of ventilator.
General information
The hot water heat pump is virtually maintenance-free. A one-off
visual inspection for possible leakage in the water system or
stopping-up of the condensate outflow should take place a few
days after the maintenance work has been carried out.
Do not carry out any maintenance work on the refrigerating cir-
cuit of the heat pump.
Only use a damp cloth and soap solution for cleaning the hot-
water heat pump.
ATTENTION!
Ensure water does not come into contact with the operator controls.
Unplug mains plug/disconnect the power supply before beginning any
cleaning work.
7.1 Water Circuit / Condensate
Outflow
The water circuit check is limited to filters that may have been in-
stalled on-site, and possible leakage. Dirty water filters should be
cleaned and replaced if necessary. Occasionally check the seal
valve in the condensed water hose for contamination; replace if
necessary.
7.2 Air Circuit
Maintenance work is limited to cleaning the evaporator on a reg-
ular basis, and as needed.
ATTENTION!
Risk of injury caused by sharp-edged fins. Fins must not be deformed or
damaged!
If air filters are used, they should be regularly checked for con-
tamination and cleaned and replaced if necessary.
7.3 Corrosion Protection Anode
The corrosion protection anode installed in the hot water cylinder
should be electrically checked on a regular basis, at least every
two years after start-up, and be replaced if necessary. Electrical
checking is carried out by means of a suitable ammeter, without
draining the tank.
Procedure:
1)
Unplug PE cable from protection anode tab.
2)
Connect ammeter (0...50mA) between PE cable and tab.
3)
Evaluation of protection anode wear:
Measured value > 1 mA protection anode is in working
order.
Measured value < 1 mA protection anode must be tested
or replaced.
If electrical testing does not provide any clear results, a visual in-
spection of the protection anode by a technician is recom-
mended.
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