Lennox 505, 021 User Manual
INSTALLATION/
E2006 Lennox Industries Inc.
Dallas, Texas, USA
SERVICE
INSTRUCTIONS
®
Humiditrol
Accessory (EDA) Units
ACCESSORIES
505,021M
02/06
Supersedes 01/06
Humiditrol
The Dave Lennox Signaturet Collection Humiditrol® Enhanced 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 blower. This accessory is designed for indoor installations in either 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 Instruction 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 damage 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
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.
®
EDA Series Unit
t
thermostat [Outdoor Sensor (46M98)
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 authorities having jurisdiction before installation.
The Humiditrol® EDA unit will operate to dehumidify, as required, when ambient temperatures are below 95ºF. When
temperatures reach 95ºF, the cooling and dehumidification
requirements will both be satisfied by the increased system 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 allowed 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.
S 75VA 24VAC indoor unit transformer (12P61) − Re-
quired when EDA unit is installed with a two-stage heat
pump system.
S Humiditrol
plications information in Lennox Engineering Handbook)
®
EDA Insulation and Piping Kit (refer to ap-
02/06 505,021M
The approved application for the EDA Series unit is
restricted to those listed in the Engineering Handbook and price book.
*2P0206* *P505021M*
Enhanced Dehumidification
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
IMPORTANT
Litho U.S.A.
®
WARNING
11/16
20−3/4
11/16
This cased product contains fiberglass wool. Disturbing the insulation during installation, maintenance, or repair will expose you to fiberglass wool
dust. Breathing this may cause lung cancer. (Fiberglass wool is known to the State of California to
cause cancer.)
Fiberglass wool may also cause respiratory, skin,
and eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets
available from address shown below, or contact
your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
Unit Dimensions
WARNING
Risk of explosion or fire. Can cause
injury or death. Recover all refrigerant
to relieve pressure before opening the
system.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFC’s, HFC’s, and HCFC’s) as of
July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.
EDA Model Dimensions − Inches (mm)
Dimension EDA−024B EDA−036C EDA−060D
A 17−1/2 (445) 21 (533) 24−1/2 (622)
B 12−1/4 (311) 12−1/4 (311) 14 (356)
C 16−1/8 (422) 19−5/8 (498) 23−1/8 (587)
D 16−1/8 (422) 19-5/8 (498) 23−1/8 (587)
E 1−3/8 (35) 3−1/8 (79) 4−7/8 (124)
F 3−1/8 (79) 4−7/8 (124) 6−5/8 (168)
G 3 (76) 3−1/4 (83) 4−3/4 (121)
Check/Flow Restrictor
to Vapor Line Tee
Liquid Line to
Indoor TXV
Liquid Line
From Outdoor
Unit
E
1
(25)
To Charge Compensator
side connection
A
9−1/2
(241)
2−1/2
(64)
F
G
Electrical
Inlet
B
(17)
1−3/4
(44)
11/16 (17)
D
11/16 (17)
OUTLET
AIR
OPENING
(527)
22−1/4
(565)
(17)
EDA 01/06
11/16 (17)
INLET AIR OPENING INLET AIR OPENING
C
11/16 (17)
1−7/16 (37)
20−1/8
(511)
Page 2
11/16 (17)
Installation Dimensions and Arrangement
EDA UNIT
(TRANSITION
See Note 2)
INDOOR
COIL
EDA−024B: 12−1/2
EDA−036C: 12−1/2
EDA−060D: 14
Varies by indoor
coil model; see
LENNOX
Engineering
Handbook.
12" (min.)
TRANSITION
(See Note 1)
FURNACE
TYPICAL
UP−FLOW
POSITION
(Furnace Shown)
TYPICAL HORIZONTAL
POSITION (Furnace Shown)
AIR FLOW
UP-FLOW FURNACE
NOTES:
1. Transition is required for all air handlers; dimension
width and depth is dependent upon the air handler
and the EDA model used.
2. Transition is required between indoor coil and EDA
if 5 ton EDA unit is used with small profile furnace.
Figure 1
Varies by air
handler model; see
Handbook for
40
AIR FLOW
LENNOX
Engineering
dimensions.
UP-FLOW AIR
HANDLER
Page 3
EDA INSTALLATION/ SERVICE INSTRUCTIONS
Component Functions
Check/Flow Restrictor Operation
Charge CompensatorThe charge compensator
(shown in figure 5) serves to maintain the proper amount of
refrigerant circulating in larger systems. [Some systems
do not require a charge compensator, but do require a simi-
FROM
VAPOR
LINE
TEE
CHECK/FLOW
RESTRICTOR FLOATS IN
CHATLEFF CONNECTOR
GREATER
PRESSURE
lar kit to connect into the system (see Engineering Handbook)]
The charge compensator stores excess refrigerant when
the EDA coil is active and returns it to the system during
FROM
VAPOR
LINE
TEE
GREATER
PRESSURE
O−RING SEALS
CHECK/FLOW
RESTRICTOR
normal cooling or heating operations. When the EDA coil is
active, less charge is required to obtain the proper amount
of subcooling because of the additional coil surface and
the cooler air which passes over the EDA coil.
Check/Flow RestrictorThe check function of the
check/flow restrictor (shown in figure 2) prevents refrigerant from flowing into the inactive components during times
when the EDA coil is inactive. The flow restrictor controls
the rate of return of charge to the system from the charge
compensator and the EDA coil when the system changes
from "EDA coil active" to "EDA coil inactive."
Valve AssemblyThe first valve of the diverting valve assembly (figure 3, E) directs the flow of refrigerant to either
bypass the EDA coil (EDA coil is inactive) or pass through
the EDA coil (EDA coil is active).The second valve (figure 3
F) directs the flow of refrigerant back to the liquid line when
the first valve (E) allows flow through the EDA coil. When
the EDA coil is inactive, the second valve (F) provides a
vent path to the suction line, draining the EDA coil and
charge compensator of liquid refrigerant.
Figure 2
EDA Unit Parts Arrangement
AB CD A B CD A B C D
EDA−024B
EDA−036C EDA−060D
EDA
UNIT
EDA
UNIT
EFEF
3−WAY DIVERTING VALVE ASSEMBLY
A − Liquid Line From Outdoor Unit
B − Liquid Line to Indoor TXV
C − Check/Flow Restrictor to Vapor
Line Tee
EDA COIL
3−WAY DIVERTING VALVE ASSEMBLY
D − To Charge Compensator side connection (1/4" line must be brazed closed on systems that do not
require the installation of a charge compensator)
E − EDA inactive mode − bypasses the EDA EDA active mode − allows refrigerant flow through EDA
F − EDA inactive mode − vent path to suction line; EDA active mode − directs refrigerant flow back to
liquid line
EDA COIL
3−WAY DIVERTING VALVE ASSEMBLY
Figure 3
EF
EDA COIL
EDA 01/06
Page 4
General Installation Information
Releasing Air Charge
NOTE − EDA units use dry air as a holding charge.
WARNING
Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss
of life, or damage to property.
Installation and service must be performed by a
qualified installer or service agency.
The EDA unit may be used in upflow or horizontal discharge installations. Slots around the inlet end of the EDA
cabinet are provided to secure the EDA unit to the duct
flanges of indoor coil/air handler cabinets. Use field-provided #8 x 1" long SDST screw (usually 6 required).
CAUTION
Physical contact with metal edges and corners
while applying excessive force or rapid motion can
result in personal injury. Be aware of, and use
caution when working nearby these areas during
installation or while servicing this equipment.
Refrigeration
All EDA coils are shipped with a combination check/flow
restrictor. The restrictor is provided in the bag assem-
bly and must be installed. Refer to the appropriate high
and/or low side installation instructions for information on
the appropriate line sets. Refer to Lennox Refrigerant Piping guide (Corp. 9351−L9) for proper size, type, and application of field−fabricated lines.
CAUTION
The EDA coil is shipped from the factory pressurized with dry air. Pierce a hole in the coil’s rubber
plug vapor line seal to relieve the pressure before removing the seals.
Ensure that the coil is void of pressure. Remove the rubber
plug from the lines.
NOTE − If there is no pressure when the plugs are pierced,
check the unit for leaks before continuing with the installation.
Refrigerant Line Connections
NOTE − When connecting lines, be careful to avoid damaging the 3−way diverting valve access panel. Place a wet rag
against the piping plate and around the EDA unit line connections. A wet rag heat shield must be in place during
brazing to guard against damage to the paint.
Electrical Wiring
Electrical wiring diagrams are provided in figures 12 and 13
(see pages 14 and 15). Some modifications to certain units
may be necessary. Review the diagrams before installation to ensure all necessary components are on hand at
time of installation.
EDA Installation and Checkout Flow Chart
Follow the procedures in the flow chart in figure 4 while referring to the illustration in figure 5 to install the EDA: and
associated components.
Page 5
EDA INSTALLATION/ SERVICE INSTRUCTIONS
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