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02/06 505,021M
*2P0206* *P505021M*
E2006 Lennox Industries Inc.
Dallas, Texas, USA
Humiditrol
®
EDA Series Unit
The Dave Lennox Signature
t
Collection Humiditrol
®
En-
hanced Dehumidification Accessory (EDA) is designed for
installation with a Lennox R−410A split−system outdoor unit
and an air handler or a furnace with a variable speed blow-
er. This accessory is designed for indoor installations in ei-
ther upflow or horizontal air discharge applications. This
unit is for use only on R−410A systems with thermal
expansion valves.
Prior to installation, study the decision tree on page
16 to confirm that all application requirements for
EDA installation are met.
NOTE − For downflow application, refer to Installation In-
struction Supplement, Installing EDA Unit in Downflow
Configuration 505,134M.
Shipping & Packing List
S 1 − Assembled EDA indoor unit
S 1 − Bag assembly (includes check/flow restrictor for
use on EDA coil, EDA notification label).
S 1 − Outdoor fan relay and wiring harness (used only
with outdoor units equipped with variable speed fan
motors)
Check the components for shipping damage. If any dam-
age is found, immediately contact the last carrier.
Other Required Components
Separately-ordered components are restricted to those
listed in the Engineering Handbook and the price book:
S SignatureStat
t
thermostat [Outdoor Sensor (46M98)
included],
− Single-stage (81M26)
− Multi−stage (81M27)
− Multi−stage heat-pump (81M28)
S Twisted Pair Wire (84X49) for outdoor sensor to ther-
mostat − Required for use with SignatureStatt.
S 75VA 24VAC indoor unit transformer (12P61) − Re-
quired when EDA unit is installed with a two-stage heat
pump system.
S Humiditrol
®
EDA Insulation and Piping Kit (refer to ap-
plications information in Lennox Engineering Hand-
book)
INSTALLATION/
SERVICE
INSTRUCTIONS
Humiditrol
®
Enhanced Dehumidification
Accessory (EDA) Units
ACCESSORIES
505,021M
02/06
Supersedes 01/06
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
Table of Contents
EDA Series Unit 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping & Packing List 1. . . . . . . . . . . . . . . . . . . . . . . .
Other Required Components 1. . . . . . . . . . . . . . . . . . . .
General Information 1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Dimensions and Arrangement 3. . . . . . . . .
Component Functions 4. . . . . . . . . . . . . . . . . . . . . . . . . .
General Installation Information 5. . . . . . . . . . . . . . . . .
Electrical Wiring 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EDA Installation Flow Chart & Procedures 5. . . . . . . .
Leak Testing, Evacuation, Charging 8. . . . . . . . . . . . . .
Insulating and Sealing the Unit 9. . . . . . . . . . . . . . . . . .
Other System Components 9. . . . . . . . . . . . . . . . . . . . .
How the EDA Unit Works 10. . . . . . . . . . . . . . . . . . . . . . .
Cooling Mode with Dehumidification ON 10. . . . . . . . . .
Cooling Mode (Dehumidification OFF) 11. . . . . . . . . . . .
Heating Mode (Heat Pump Applications) 11. . . . . . . . . .
Air Resistance Table 13. . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts List 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagrams 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Decision Tree 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information
NOTE − These instructions are intended as a general guide
and do not supersede local codes in any way. Consult au-
thorities having jurisdiction before installation.
The Humiditrol
®
EDA unit will operate to dehumidify, as re-
quired, when ambient temperatures are below 95ºF. When
temperatures reach 95ºF, the cooling and dehumidification
requirements will both be satisfied by the increased sys-
tem runtime. In applications that include a Humiditrol
®
EDA unit, a call to activate the dehumidification mode at or
above 95ºF is unnecessary and would not be issued or al-
lowed by the SignatureStatt room thermostat.
Prior to system checkout, consider the outdoor ambient
temperature. REMEMBER, the EDA unit does NOT
function in temperatures at or above 95ºF. Plan testing
to be conducted when temperatures are between 65ºF and
95ºF to ensure proper EDA set up and checkout operation.
IMPORTANT
The approved application for the EDA Series unit is
restricted to those listed in the Engineering Hand-
book and price book.
Litho U.S.A.