Overcooling; Dehumidification Set Point; Advanced Dehumidification Descriptions; Ventilation (Erv, Hrv And Fresh Air Damper) - Lennox iComfort E30 Installation And Setup Manual

NOTE: Recommend use of DATS catalog number 88K38 when variable
capacity outdoor units are used.
» Variable Capacity
Recommended when outdoor air is excessively humid. Adjusts
cooling based on duct sensor data. May cool your home below the
set temperature.

Overcooling

Slide bar adjust with a range of 0°F to 4°F (-17.8 to -15.5°C). Only available
when Max is selected.

Dehumidification Set Point

Slide bar adjust with a range of 40% to 60%.

Advanced Dehumidification Descriptions

See table 1 for detail information concerning system operations when using
Normal or Max settings.
Table 12. Dehumidification Control Modes of Operations
Mode of
Option
Operation
Normal
Max
Dehumidification
Only
dehumification set−point
40%
Outdoor Units with DATS
Description
Staged Outdoor Units: Dehumidifies while servicing a
cooling demand and will not over-cool. The over-cool
slider is hidden from the user.
Staged Outdoor Unit: If at the start or during a cooling
call, the humidity is above the relative humidity set point
then the unit dehumidifies during the cooling demand.
If at the time the cooling call terminates, the humidity
demand is not satisfied, over-cooling will occur up to the
over-cooling slider setting in an attempt to satisfy the
dehumidification demand. Once the room temperature
reaches the over-cooling set point. If the system still has
a dehumidification demand, the system keeps using the
over-cooling set point as its operating cooling set point
(will not wait for the temperature to rise to the normal
cooling set point to run again) until the dehumidification
demand is satisfied
48%

Ventilation (ERV, HRV and Fresh Air Damper)

installed.
This equipment is designed to provide fresh air while exhausting an equal
amount of stale air.

Ventilation Rates

The E30 ventilation function is only a turn on - turn off feature. All CFMs must be
adjusted from the HRV/ERV unit. The ventilation function can be controlled by
outdoor temperatures and by timers in the thermostat. The ventilation feature
can also control 1 and 2 stages of ventilation operation.
Thermostat ventilation CFM parameters are to be adjusted only after the HRV/
ERV set up is completed and the CFMs are known. Once the thermostat's
CFMs are adjusted they are used with the thermostat's timer algorithm to
determine how long to run the HRV/ERV and to change from low to high speed
if a 2-stage HRV/ERVs.

Energy Recovery Ventilator (ERV)

The ERV unit is equipped with an enthalpic core. This device is designed
for use in warm, humid climates with heavy air conditioning loads. The ERV
unit transfers both sensible (temperature) and latent (moisture) heat from
incoming fresh air to the stale air as it is being exhausted; thus, reducing the
air conditioning load.

Heat Recovery Ventilator (HRV)

The HRV unit is equipped with an aluminum core. The device uses the stale
air that is being exhausted to condition the fresh air as it is being brought in.
Lennox models are all non-communicating equipment and can be added during
the commissioning procedure (see "Commissioning (Using the HD Display)"
on page 15).

Fresh Air Damper

This option is used to control a damper connecting outside air to the return
plenum of the system. When a fresh air damper style of ventilation is added to
the system, and ventilation is required, the ventilation demand is serviced by
energizing 1 relay to close or open the relay contacts connected to the fresh air
damper and commanding the blower to run at a rate of at least the continuous
fan speed.
60%
The parameter Fresh Air Damper Ventilation CFM represents the CFM of the
air drawn through the fresh air damper while the system runs the indoor blower
at the continuous fan speed for non-zoned systems, and the lowest zone CFM
(continuous fan, heating, or cooling) for zoned applications. All calculations
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