Lennox CLIMATIC series User Manual

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CLIMATIC RT_UNITARY-IOM-1508-E
COMPONENTS
ENERGY RECOVERY (OPTION)
Function
The CLIMATIC offers in option a solution to recover the energy of the exhaust air. There are 3 types of recovery:
• plate heat exchanger for BALTIC™ units,
• rotary wheel exchanger for FLEXY™ units.
• Thermodynamic heat recovery for BALTIC™ units
Description
The recovery activation can be specifi ed according to the scheduling and can take different mode for each schedule mode (Night, Day,
Day I, Day II and BMS) in the menu (3871).
The recovery control depends on mainly the outside air temperature. The recovery is activated if:
• outside temperature  return air temperature in cooling mode,
• outside temperature  return air temperature in heating mode.
Plate heat exchangers - BALTIC™
For BALTIC™ units using plate heat exchangers, the CLIMATIC activates the by-pass damper. It opens if the free-cooling is activated
or to defrost the heat exchanger. The defrost is activated by a differential pressure switch installed in the module.
In order to defrost, the damper bypass is opened for 6 minutes. 15 operating minutes minimum are required between two defrosts.
Enthalpie wheel - FLEXY
TM
For FLEXY™ units using enthalpie wheel, the CLIMATIC activates the wheel motor if |Outside air t° - return air t°|  (3872)°K
If the outside air temperature is below the threshold (3873) the wheel is likely to icing; to avoid this phenomenon the motor is
stopped 3 minutes every hour to defrost the wheel.
Thermodynamic heat recovery - BALTIC™
For BALTIC™ units using thermodynamic heat recovery, the compressor(s) dedicated to heat recovery is (are) managed as
additional capacity stage(s).
So, the setpoints 3421, 3431 and 3441 decribed in the COMPRESSOR § enables also these compressors.
However, the compressors assigned to heat recovery are activated only if the following conditions are met:
• The return air temperature is > 16°C
• The fresh air damper opening is > 22% .
Priority is then given to energy recovery compressors compared to other compressors whether the fresh air damper opening is>
50%.
Priority is then given to other compressors compared to the energy recovery compressors if the fresh air damper opening is
<50%
Day mode
YES
Night mode
NO
Day mode
YES
DayI mode
YES
DayI mode
NO
Night mode
NO
Night mode
NO
Recovery activation Recovery activation
Air outside temperature (°C)
Air outside temperature (°C)
Cooling mode
Heating mode
Return
temperature
Return
temperature

Lennox CLIMATIC series Specifications

General

Brand	Lennox
Model	CLIMATIC series
Category	Controller
Language	English