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Fig. 5-4
Manual vent valves
5.1.5 Checking the minimum flow
The minimum flow must be checked with the heating circuit
closed.
If the minimum flow is too low, an error message may
appear and the heating system may shut down.
If the minimum flow is inadequate:
– air may be in the circulation pump.
Vent the circulation pump (heat pump outdoor unit).
– the valve drive of the 3-way switch valves (3UVB1 /
3UV DHW) may be defective.
Check the function of the valve drives; replace the valve
drive if necessary.
● Close the valves and adjuster drives of all connected heat
distribution circuits.
● Set "Heating" operating mode on the Daikin Altherma M
ECH
O controller.
2
● Read out the information parameter [Flow Rate].
The flow rate must be at least 480 l/h (see controller oper-
ating instructions).
The Daikin Altherma M ECH
monitors the flow rate of the internal heat generator cir-
cuit. Different minimum flow rate values are required
depending on the active operating mode:
"Heating" operating mode
"Cooling" operating mode
Automatic defrost function active
If an error message regarding an inadequate minimum flow is
displayed at a flow rate over 600 l/h, check the actual flow rate
in the active operating mode and eliminate possible fault
causes.
5.1.6 Setting the parameter Screed Program
(only when required)
With the screed program, the feed temperature is controlled
according to a pre-set temperature profile.
See the controller operating instructions for further information on
the screed program, its activation and sequence.
Daikin Altherma M ECH
O
2
Solar storage tank with heating controller
008.1446799_00 – 07/2019 – EN
O controller constantly
2
5-7 kW
11-16 kW
480 l/h
600 l/h
600 l/h
900 l/h
780 l/h
900 l/h
After the screed program has ended, the RoCon mb control unit
continues to work in the previously set operating mode. If not con-
figured beforehand, the following finishing work is necessary.
a) On connection without room station EHS157034:
● Set the heating characteristic curve or required T-HS.
b) On connection with room station EHS157034:
● Activate the room station.
● Set the heating characteristic curve or required T-HS. If
necessary, activate the [Room Influence] parameter and
set the room target temperature.
5.2 Re-commissioning
5.2.1 Requirements
CAUTION!
Setting up in frosty conditions can result in
damage to the entire heating system.
● Commissioning at temperatures below 0 °C
only if a water temperature of at least 5 °C is
guaranteed in the heating system and the
storage tank.
Daikin recommends not operating the installa-
tion in extremely frosty conditions.
– The Daikin Altherma M ECH
– The heating and hot water system has been filled and pres-
surised to the correct pressure (see chap. 7.4).
– The storage tank is filled up to the overflow (see chap. 7.3).
5.2.2 Start-up
If the storage tank temperature falls below specific
minimum values, the Daikin Altherma M ECH
safety settings prevent the heat pump from being
operated at low outside temperatures:
– Outside temperature < -2 °C, minimum storage tank
temperature = 30 °C
– Outside temperature < 12 °C, minimum storage tank
temperature = 23 °C.
Without backup heater:
The storage tank water must be heated to the required mini-
mum storage tank temperature with an external heater booster.
With backup heater (EKBUxx):
At an outside temperature of < 12 °C and a storage tank tem-
perature of < 35 °C, the backup heater (EKBUxx) is automati-
cally switched on to heat the storage tank water to at least
35 °C.
● To speed up the heating process with backup heater,
temporarily set
– parameter [Function Heating Rod] = "1" and
– parameter [Power DHW] to the maximum value of the
backup heater.
– Set the rotary switch to
the parameter [1x Hot Water] to "On". After heating, set
the parameter to "Off" again.
5
x
Start-up
O is fully connected.
2
O's
2
operating mode, and set
Installation and maintenance instructions
35
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