Lennox CLIMATIC series, User Manual

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(3861):
(3862):
(
3863
):
(
3864
):
(
3865
):
(
3866
):
CLIMATIC RT_UNITARY-IOM-1508-E
COMPONENTS
EXHAUST (OPTION)
Function
The CLIMATIC manage 2 different type of exhaust
• A step control up to three exhaust fans to assure a good differential pressure between the supply and the return air. Starts and
stops of these fans depend on the opening of the fresh air damper
• A continuous exhaust when the unit is equipped with a variable speed fan.
Description
Step control exhaust
The exhaust fan(s) are activated according to the fresh air opening pourcentage of the damper.
• if the fresh air opening ≥ (
3861
), the stage 1 is turned on,
• if the fresh air opening ≥ (
3862
), the stage 2 is turned on,
• if the fresh air opening ≥ (
3863
), the stage 3 is turned on.
Fresh air opening (%)
Exhaust fan stage
Continuous exhaust fan
The exhaust fan is then working in parralel with the blower (see relative §) with a nominal air fl ow threshold (
3864
), a minimum
air fl ow threshold (
3865
) and a coef fi cient to compensate the fresh air damper closing (
3866
).
Settings
The different settings to adjust the exhaust fan are available in the menu:
opening percentage threshold of actuator for 1st fan
opening percentage threshold of actuator for 2nd fan
opening percentage threshold of actuator for 3rd fan
nominal threshold for air
fl ow control
low threshold for air fl ow control
coef fi cient for compensation of losses of the air damper