Lennox CLIMATIC series User Manual page 12

AIR MANAGEMENT
In cooling mode
Proportional rule between
CF Cool Blowing air temperature set point visible in menu (2232)
0% Threshold : room temperature Cooling set point (2242) + (2253)
100% (2251)
Example
- If the Cooling Capacity Factor (2227) is reaching 100% according to room temperature
cooling set point (2242), measured room temperature and integral time (3228),
- then the calculated blowing air temperature set point (2232), will be equal to the low
limit threshold in cooling mode (2251).
In dead zone
CF Heat CF Cool
0%
0%
The various components of the roof top are then stagging according to a priority level and with a capacity factor calculated from the
measured blowing air temperature and the blowing air temperature set point calculated as above.
In the CLIMATIC there are 7 capacity factors calculated for the blowing air :
1. Damper for Free-Heating
2. Compressors in heating mode (Heat pump)
3. 1st Additional heaters (Gas, Elec. or Water)
4. 2nd Additional heaters (Elec. or Water)
5. Damper for Free-Cooling
6. Compressors in cooling mode
7. Chilled water
The controller is calculating for the seven components the necessary capacity to reach the temperature set point. It is directly linked to
the number of control stages of the unit. Thus for a unit with 4 stages of regulation, the CF will start and stop a stage with the following
values: ~0-25-50-75-100%
Each capacity factor is linked to an integral time allowing to act on the reaction speed.
Nota - In Dead zone, the control may follow different rules. Smooth function (2233)
• Smooth = No - If 'No' is selected, when the room temperature is in dead zone, after ten minutes all power factors of supply control
are forced to zero. So no compressors or heaters will be switched on. This choice is the one from factory setting.
• Smooth = Dead Z. If 'Dead Z.' is selected, when the room temperature is in dead zone, the supply air temperature is maintained
with the compressors or heaters.
• Smooth = Comfort. If 'Comfort' is selected, the supply temperature is fully controlled using all possibilities with the unit.
WARNING In this mode the supply temperature will be fully controlled in all modes. This mode is best for comfort but not for
Energy Savings. Use this mode only when necessary
Settings
The different settings to adjust the air room temperature control are available in the menus:
(2233): Smooth mode activation
(2251): low limit threshold in cooling mode
(2252): high limit threshold in heating mode
(2253): offset for high limit threshold in cooling mode
(2254): offset for low limit threshold in heating mode
(3228) integral time control for cooling mode
(3229) integral time control for heating mode
(3435) integral time control, compressor in cooling mode
(3445) integral time control, compressor in heating mode
(3735) 1st heaters, integral time control
(3738) 2nd heaters, integral time control
(3823) integral time control fresh air damper
(3913) integral time control, chilled water
• 10 •
Blowing air temperature set point visible in menu (2232)
Outside air temperature, limited by Threshold of room temperature Heating set point and
Threshold of room temperature Cooling set point.
(2232) Blowing air temp set point
(2242)+-(2253) 23°C
(2251) 12°C
Cooling Capacity Factor
0% 100%
CLIMATIC RT_UNITARY-IOM-1508-E
(2227)