7.8 Warm-weather shutdown
When a defined maximum outdoor temperature has been
surpassed one to three days in a row, MIXIT automatically shuts
down and the pump stops. MIXIT and the pump start again when
the average outdoor temperature falls below the temperature
limit one to three days in a row, depending on the defined settings.
The temperature signal must be available from either an outdoor
temperature sensor or fieldbus.
Once the function has been activated or the function settings have
been changed, MIXIT will immediately act accordingly.
This function can only be set via Grundfos GO Remote.
7.8.1 Setting warm weather shutdown
Grundfos GO Remote menu:
Main menu
>
Settings
>
Eco functions
>
Warm weather
1.
Activate the function by pressing the grey slide-button in the
top right corner of the screen.
2.
Press
Outdoor temperature threshold
and define a maximum
outdoor temperature. Press
OK
to save the setting.
3.
Press
Average period
to define the number of days the
outdoor temperature is allowed to surpass the defined
threshold.
4.
Press
OK
to save the setting.
7.9 Pressure independence
If the differential pressure varies on the primary side, the flow
through the valve changes causing poor control performance and
fluctuating temperature.
By measuring the flow on the primary side, MIXIT is able to regulate
the valve position accordingly. This means that MIXIT maintains a
constant flow even though the differential pressure on the primary
side changes. This allows the system to perform optimally,
increasing both comfort and energy efficiency.
The function is automatically activated when MIXIT is upgraded with
the DYNAMIC upgrade or if the MIXIT unit is a MIXIT DYNAMIC.
7.10 Limiters
For these functions to be unlocked, the DYNAMIC
upgrade must be activated on the MIXIT unit or the unit
must be a MIXIT DYNAMIC. See
All limiters can run simultaneously.
The actual temperature setpoint can be monitored via AI,2.
ID
Object name R/W
Description
AI,2
Data Act
Temp
Setpoint [° C]
R
Actual temperature setpoint used in
temperature controller.
If the limiter function is set to off, it is
the same as the actual reference
temperature derived from the set
reference temperature mode via
MV,0. See
.
7.10.1 Configuring the supply flow limit
1.
Enable the supply flow by setting BV,0 to 1.
2.
Configure the limit via AV,10.
Both values are stored in the product.
If the supply flow limit is surpassed, the MIXIT unit gives a
notification by setting BI,8 to 1.
All limiters can run simultaneously.
ID
Object name R/W
Description
BV,0
Config
Supply Flow
Limiting ED
R/W
0: Disabled
1: Enabled.
AV,10
Config
Supply Flow
Limit [m3/h]
R/W
BI,8
Notification S
upply Flow
High
R
0: Not above
1: Above.
The supply flow is above the limit in
AV,10 for extended time (3600 s).
The notification is not resettable, but
it will reset itself.
7.10.2 Configuring the return temperature limit
•
Enable the return temperature limit by setting BV,2 to 1.
•
Configure the limit via AV,12.
For heating applications the value works as an upper threshold.
For cooling applications the value works as a lower threshold.
Both values are stored in the product.
If the return temperature limit is above (heating) or below (cooling)
the given value, the MIXIT unit gives a notification by setting BI,10
to 1.
All limiters can run simultaneously.
ID
Object name R/W
Description
BV,2
Config
Return Temp
Limiting ED
R/W
0: Disabled.
1: Enabled.
AV,12
Config
Return Temp
Limit [°C]
R/W
BI,10
Notification
Return
Temperature
Threshold
R
0: Not above (heating). Not below
(cooling).
1: Above (heating). Below (cooling).
Return temperature exceeds the
limit in AV,12 for extended time
(3600s). The notification is not
resettable, but it will reset itself.
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