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Table 17. Dehumidication Control Modes of Operations
Mode of
Operation
Option Description
1 All Lennox variable capacity outdoor units.
NOTE - The above information is applicable only for non-zoning systems. There is no
dehumidication capability in zoning systems.
Lennox Smart Zoning
This optional equipment is compatible with the following Lennox equipment:
• Lennox communicating variable speed or variable capacity (variable capacity)
indoor and two-stage or variable capacity (modulating) outdoor units.
• Lennox communicating variable speed indoor unit and communicating or
non-communicating (conventional) single-stage outdoor unit (two zones
maximum supported).
• Lennox communicating variable speed indoor unit and communicating or
non-communicating (conventional) two-stage outdoor unit (four zones
maximum supported).
• Parameter settings are listed in “Table 11. Zoning Control Parameters” on
page 36.
• Wiring connections are all Lennox accessories in the installation instruction
for the specic product.
IMPORTANT
The Lennox Smart Room Sensor is not compatible with systems using the
Lennox Smart Zoning System (formerly know as iHarmony) installed.
PureAir S
This optional equipment supports the following features:
• 4-wire connection to Lennox communicating indoor unit control
• Using sensors to:
» Automatically detect dirty air lter
» Display air lter life percentage
» Monitor UVA lamp operational state (On or Off).
» Display UVA lamp life percentage
• Parameter settings are listed in “Table 12. PureAir S Parameters” on page
36.
• Applicable alarms for PureAir operations are listed in “Alert Codes” on page
46.
Ventilation (ERV, HRV and Fresh Air Damper)
NOTE: ERV/HRV and Fresh Air Damper operations will required a Equipment
Interface Module (EIM), catalog number 22X18.
This optional equipment is designed to provide fresh air while exhausting an
equal amount of stale air.
NOTE: When using a fresh air damper, a eld-provided 24VAC transformer
(Lennox Catalog Number 10P17) is required.
For complete installation and setup information for ventilation equipment,
see Equipment Interface Module (EIM) (22X18) Installation and Setup Guide
(507240-0x) for complete details.
Ventilation Rates
The S40 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 Thermostat” on
page 17).
Parameter settings and descriptions are listed in “Table 5. Thermostat
Parameters” on page 21. The table below list which parameters are available
for the Fresh Air Damper, ERV and HRV equipment.
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