Vaillant ecoTEC plus VUI Series, Installation And Maintenance Instructions Manual

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0020308121_04 Installation and maintenance instructions
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10.2 Activating an additional component for the
multi-functional module
Condition : Components connected to relay 1
▶
Select the parameter D.027 to assign a function to re-
lay 1. (
→
Section 8.3)
Condition : Components connected to relay 2
▶
Select the parameter D.028 to assign a function to re-
lay 2. (
→
Section 8.3)
10.3 Adapting the heating settings
10.3.1 Heat input
During operation, the heat input is continuously adjusted to
the required heat output for the heating system.
10.3.1.1 Minimum heat input
You can use D.085 to raise the lowest heat input in the
range between the minimum value and the limit value for the
ignition output that is technically required. The heat cell
modulates up to the set value and the modulation range is
restricted.
The cycling mode is made more likely by raising the lower
modulation limit.
This setting applies for heating and domestic hot water
mode.
10.3.1.2 Setting the maximum heat input
The maximum heat input can be adjusted to the installation's
determined output requirement via
D.000 .
If the Auto setting is activated in parameter D.000 , the
product automatically adjusts the maximum heat input to the
installation's current requirements.
10.3.2 Flow temperature
10.3.2.1 Limiting the flow temperature
The maximum target value for the flow temperature in heat-
ing mode can be limited. The product will not reach a higher
temperature level in the heating mode.
▶
Call up the installer level. (
→
Section 8.2)
▶
Set diagnostics code D.071 to the individual maximum
value.
10.3.2.2 Setting the flow temperature
A target value for the flow temperature in heating mode can
only be set via the control panel if no system control is con-
nected to the product. This is not usually the case.
The flow temperature is the temperature at which the heating
water leaves the heat generator (e.g. 65° C).
▶
From the basic display, press .
◁
The flow temperature that has already been set is
shown in the display.
10.3.2.3 Setting the desired temperature
→
System control operating and installation instructions
The system control can be used to set the desired temperat-
ure.
The desired temperature is the temperature that is desired
for the living room (e.g. 21 °C).
Note
The selection of the desired temperature does not
affect the flow temperature.
10.3.3 Setting the operating mode and overrun for
the heating pump
With regard to the heat supply for the heating system, it is
important to detect the heat saturation and the heat demand
for the heating system. There are two setting options for this:
–
Pump overrun
–
Pump mode
After the burner stops, the pump overrun can be defined in
real time via diagnostics code
D.001 .
The pump mode can be selected via diagnostics code
D.018 . The pump mode does not affect the pump control
strategy. There are two modes:
–
Permanent: The internal heating pump runs continuously
in the active heating time period.
–
ECO: The pump runs intermittently following burner oper-
ation and pump overrun in order to detect a potential heat
demand (5 mins on/25 mins off)
Note
A heat demand is detected from the negative tar-
get-to-actual flow temperature deviation for heat-
ing mode.
10.3.4 Burner anti-cycling time
To prevent frequent switching on and off of the burner and
thus prevent energy losses, an electronic restart lockout
is activated for a specific period each time the burner is
switched off. The burner anti-cycling time is only active
for the heating mode. Hot water handling during a burner
anti-cycling time does not affect the time function element
(default setting: 20 mins).
10.3.4.1 Setting the burner anti-cycling time
Diagnostics code D.002 can be used to adjust the burner
anti-cycling time for a potential cycle optimisation in heating
mode. If no heating mode heat demand is detected in the
direct pump overrun, no burner start takes place in the active
burner anti-cycling time (
D.067 ).
The effective heating mode burner anti-cycling time is de-
termined from the maximum possible target flow temperature
(
D.071 ), the current target flow temperature and the setting
level under D.002 .
▶
Set diagnostics code D.002 . (
→
Section 8.3)
▶
Exit the diagnostics codes. (
→
Section 8.3.1)
▶
Exit the installer level. (
→
Section 8.2.1)
Effective burner anti-cycling times D.002 at max. target flow
temperature 75 °C