CIAT AirControl CTA Manuel De Régulation page 77

Depending on the states in the 2 previous conditions, the table below shows the authorisation or disabling of cooling and heating
operation:
Heating outdoor
zone
Cooling outdoor
zone
Mid-season operation in energy optimisation mode
Two conditions define authorisation or prohibition of cooling and heating operation:
 The room temperature/ambient setpoint (heating, neutral or cooling zone)
 The outdoor temperature/set mid-season operating threshold (screen p27) with hysteresis of 0.5°C
Cooling outdoor
zone
Depending on the states in the 2 previous conditions, the table below shows the authorisation or disabling of cooling and heating
operation:
Heating outdoor
zone
Cooling outdoor
zone
1.5.11 Heat recovery
The plate recovery unit
A differential pressure sensor is used to check the fouling level on the exhaust side of the heat recovery unit and to manage the
frost protection safety function when the unit is running. This safety function activates the bypass damper.
This register is also controlled in the event of application of free cooling or night refreshment.
The accumulator heat recovery unit
The operating principle is as follows:
- For heating in recovery , it is necessary that the recovery temperature ( or room ) is higher than the air temperature + new
minimum gap
- For a refresh recovery , you need the recovery temperature ( or room ) is less than the new minimum gap less air temperature.
Two types of accumulator heat recovery unit are possible:
- The fixed speed heat recovery unit
- The variable speed heat recovery unit
Ambient zone
heating request
Heating authorised
Cooling disabled
Heating authorised
Cooling disabled
0.5°C
0.5°C
Operating
threshold
Heating zone
Heating authorised
Cooling disabled
Heating authorised
Cooling disabled
EN - 11
Ambient zone
cooling request
Heating disabled
Cooling authorised
Heating authorised
Cooling authorised
Heating outdoor
zone
Deadband
Heating disabled
Cooling authorised
Heating authorised
Cooling authorised
Outdoor T°
Cooling
zone
Heating disabled
Cooling authorised
Heating disabled
Cooling authorised
EN