INSTALLATION
Installation
16
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10.12 Venting the heating system
Automatic air vent valve in the multifunction assembly MFG
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Remove the cover panel in front of the refrigerant circuit (see
chapter "Fitting the appliance casing").
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1 Air vent valve
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Vent the pipework by pulling up the red cap on the air vent
valve.
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Close the air vent valve after the venting process.
Air vent valve on the inverter
!
Material losses
The air vent in the knurled cap of the air vent valve must
not point towards the PCB.
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Turn the air vent away from the PCB.
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1 Air vent valve
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Vent the pipework by turning the grey cap on the air vent
valve.
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Close the air vent valve after the venting process.
Manual air vent valve
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1 Manual air vent valve
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Vent the pipework by activating the ventilation.
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Close the air vent valve after the venting process.
10.13 Minimum flow rate
The minimum flow rate and the defrost energy must always be
assured (see chapter "Specification / Data table").
10.14 Flow rate on the heating side
!
Note
For operation without a buffer cylinder, it is essential
that the electric emergency/booster heater (DHC) is con-
nected.
The flow rate is set automatically via the self-regulating system
(see menu "COMMISSIONING / HEATING / SPREAD CONTROL /
STANDBY PUMP RATE" in the heat pump manager).
In heat pump mode a fixed spread between the heat pump flow
and return is set (see menu "COMMISSIONING / HEATING / SPREAD
CONTROL" in the heat pump manager).
The appliance is designed in such a way that no buffer cylinder
is required in conjunction with appropriately sized area heating
systems.
Installations with several heating circuits require a buffer cylinder
to be used.
Checking the flow rate
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Set parameter STANDBY PUMP RATE to 100 %.
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Set buffer operation to OFF.
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If no buffer cylinder is installed, close all controllable heating
circuits.
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The current flow rate can be called up in the menu "INFO /
INFO HEAT PUMP / PROCESS DATA" under "WP WATER FLOW
RATE".
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Compare the value with the specification (see chapter "Speci-
fication / Data table").
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If the specified flow rate is not met, take suitable measures
to achieve the flow rate.
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If no buffer cylinder is installed, reopen all controllable heat-
ing circuits.
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Reset the parameters to their original values.
10.14.1 Minimum flow rate with individual room control via
FET / FE7 in systems without buffer cylinder
For systems without a buffer cylinder, in the menu "SETTINGS /
HEATING / STANDARD SETTING", set parameter "BUFFER OPER-
ATION" to "OFF".
In such cases, one or more heating circuits in the heating system
must be left open. Ensure the minimum flow rate (see "Specifica-
tion / Data table") by means of the relevant open heating circuits
(see table "Sizing recommendation for the underfloor heating
system in the lead room").
Note
The table applies if individual room control is installed.
Sizing recommendation for the underfloor heating system in the
lead room:
