CIAT AirControl CTA Manuel De Régulation page 78

For the fixed speed version, a self-cleaning procedure is started if the heat recovery unit has not been used for more than 4
hours of unit operation.
For the variable speed version, a 0-10V signal is sent to the heat recovery unit control which manages the various functions
(rotation control, monitoring of the belt, self-cleaning, low voltage, etc.). Its sends a summary of the heat recovery unit faults to
the controller, via a potential-free (dry) contact. In case of a fault, it stops and an alarm is displayed.
The accumulator heat recovery unit stops if there is a Free cooling request.
The rotation of the recuperator heater is stopped in case of free cooling request nocturnal refresh or closing the mixing damper .
Brine to recovery
The operating principle is as follows :
- For a heating recovery must :
The recovery temperature ( or room ) > to the new air temperature + minimum gap .
- For a refresh recovery , it is necessary that :
The recovery temperature ( or ambient ) <to nine air temperature - minimum gap
Pump the brine circuit is activated under the above conditions.
The pump Brine circuit is stopped in case of free cooling demand , night DRINK or closing the mixing damper .
The safety of the pump is returned to the controller via a dry contact. In case of failure , it stops and displays an alarm
1.5.12 GGS module (heat generator with forced air gas burner)
For management of this module, the upper limit factory value for calculating the supply air T° setpoint automatically switches
from 26 to 35°C.
The burner will be authorised to operate if:
- Switch S1 on the front of the unit is in the On position
- There is no burner fault (contact)
- No Combustion chamber overheating fault is present (thermostat)
- If there is a temperature regulation request
Management of the supply air temperature with a modulating burner
If ramp up/down start is selected, the burner output will increase or decrease gradually based on the difference between the
heating requirement and the burner output. Depending on this difference, every second, there will be an action corresponding to
the following value: addition or deletion of 100/ramp time.
Management of the supply air temperature with a 2-stage burner
Heating requirement (%)
100
P944
Heating requirement (%)
Burner authorisation
P943 P942 P941
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