Lennox International Inc 021 installation instructions Installation Service Instructions, 2P0206

E2006 Lennox Industries Inc.

Dallas, Texas, USA

Humiditrol® EDA Series Unit

The Dave Lennox Signaturet 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

S1 − Assembled EDA indoor unit

S1 − Bag assembly (includes check/flow restrictor for use on EDA coil, EDA notification label).

S1 − 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:

SSignatureStatt thermostat [Outdoor Sensor (46M98) included],

−Single-stage (81M26)

−Multi−stage (81M27)

−Multi−stage heat-pump (81M28)

STwisted Pair Wire (84X49) for outdoor sensor to ther- mostat − Required for use with SignatureStatt.

S75VA 24VAC indoor unit transformer (12P61) − Re- quired when EDA unit is installed with a two-stage heat pump system.

SHumiditrol® EDA Insulation and Piping Kit (refer to ap- plications information in Lennox Engineering Hand- book)

02/06

INSTALLATION/

SERVICE

INSTRUCTIONS

Humiditrol® Enhanced Dehumidification Accessory (EDA) Units

ACCESSORIES

505,021M

02/06Litho U.S.A. 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.

505,021M

*2P0206* *P505021M*