CTC Union EcoLogic L, Installation And Maintenance Manual

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CTC EcoLogic M/L
Primary flow temperature
• The minimum primary flow temperature is calculated from the value set
for the primary flow temperature at outdoor temperatures of +20 °C
and +40 °C respectively.
--> see the “Primary flow at outdoor temp +20 °C/+40 °C” menus.
• The estimated diff. is calculated from the diff. set value permitted
between the primary flow and return temperature of the cooling flow at
outdoor temperatures of +20 °C and +40 °C respectively.
--> see the “Primary flow diff. outdoor temp +20 °C/+40 °C” menus.
Every x minutes, a new primary flow temperature is calculated based on the
return temperature.
--> see the “Diff delay calc.” menu.
If the value is lower than the minimum primary flow temperature, then this
sets the minimum primary flow temperature.
Mixing valve control is calculated from the current and estimated primary flow
temperature.
1.10.3.2 Alarm logic cooling
An alarm is triggered if:
• The cooling flow temperature is lower than the set value (factory
setting: 18 ºC) minus 0.5 ºC.
The value is set on the menu bar “Min. flow temp cooling”.
or
• For a common system: the primary flow temperature is lower than the
room temperature minus the set flow diff. (factory setting: 5 ºC) minus
0.5 ºC.
The “flow diff.” value is set on the menu bar “Max diff. room temp
cooling” in the “Installer/Service/Coded settings/Cooling” menu.
If any of the conditions are met for 10 minutes, the mixing valve (Y3) closes
for 5 minutes at separated heating/cooling. The mixing valve is permitted
to control the system for a total of 30 minutes. If the error persists after this
time, the alarm will be triggered and appear in the display on the start menu.