Lennox EDA User manual

Humiditrol Enhance Dehumidication Accessory
(EDA) Units
Installation, Setup and User Guide
506064-02 4/2019
Supersedes 506064-01
2019©Lennox Industries Inc.
Dallas, Texas, USA
NOTE - EDA is not applicable to variable-capacity outdoor units!

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2.7. Using Humiditrol Comfort Adjust ........................................................................19
2.8.DehumidicationRequirements .........................................................................20
3. Enabling Thermostats for Humiditrol.................................. 20
3.1.CS7500ResidentialThermostat ........................................................................20
3.2.iComfortE30andS30Thermostats...................................................................21
3.3.iComfortM30Thermostat ..................................................................................21
4. Modes of Operation .............................................................. 21
4.1.DehumidicationMode(CoolingON).................................................................21
4.2.CoolingMode(DehumidicationOFF)...............................................................22
4.3.HeatingMode(HeatPumpApplications) ...........................................................22
5. Air Resistance ....................................................................... 22
6. Thermostat Demand Signal.................................................. 23
7. Checklist ................................................................................ 24
Table of Contents
1. General..................................................................................... 2
1.1.ShippingandPackingList....................................................................................2
1.2.AdditionalPartsRequired ....................................................................................3
1.3.Introduction ..........................................................................................................3
1.3.1. ComfortSense®7500Thermostat ........................................................................ 3
1.3.2. iComfort®FamilyofThermostats ......................................................................... 3
1.3.3. OperationOverview .............................................................................................. 3
1.3.4. OperationNotes .................................................................................................... 4
1.4.WiringDiagramLocater .......................................................................................4
1.5.DecisionTree .......................................................................................................5
1.6. Unit Dimensions...................................................................................................6
1.7.InstallationConguration......................................................................................7
1.7.1. HorizontalandUp-ow.......................................................................................... 7
1.7.2. Down-ow ............................................................................................................. 8
1.8.ComponentFunctions ........................................................................................10
1.8.1. ChargeCompensator.......................................................................................... 10
1.8.2. Check/FlowRestrictor ......................................................................................... 10
1.8.3. ValveAssembly ................................................................................................... 10
2. Installation ............................................................................. 11
2.1.Information ......................................................................................................... 11
2.1.1. Refrigeration.........................................................................................................11
2.1.2. ReleasingAirCharge ...........................................................................................11
2.1.3. RefrigerantLineConnections...............................................................................11
2.2.ElectricalWiring ................................................................................................. 11
2.3.HumiditrolInstallationandCheckoutFlowChart ...............................................17
2.4.LeakTesting,Evacuating,Charging...................................................................18
2.4.1. 3-WayDivertingValveOperation ........................................................................ 18
2.4.2. LeakTesting,Evacuating,Charging.................................................................... 19
2.5.InsulatingandSealingtheUnit ..........................................................................19
2.6.OtherSystemComponents................................................................................19
2.6.1. BlowerControl..................................................................................................... 19
2.6.2. ThermostatandSensor....................................................................................... 19
1. General
1.1. Shipping and Packing List
Table 1. Packing List
Quantity Description
1 Humiditrol®EnhancedDehumidicationAccessory(EDA),EDA-024B(94M41),
EDA-036C(94M42)orEDA-060D(94M43)
1Bagassembly(includescheck/owrestrictorforuseonHumiditrolcoil,andHumid-
itrolEDAnoticationlabel).
1Outdoorfanrelayandwiringharness(usedinselectapplications.Refertosystem
wiringdiagramspages18to21forapplicableapplications).
1InstallationInstruction
1Warranty(W-772-L8-04)

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1.2. Additional Parts Required
Separately-ordered components are restricted to those listed in the Product
Specicationsandthepricebook
Table 2. Additional Parts
Quantity Description
Application
specic
OutdoorTemperatureSensor(X2658)
75VA24VACindoorunittransformer(12P61)isrequiredwhentheHumiditrolunitis
installedwithatwo-stageheatpumpsystem.
HumiditrolInsulationandPipingKit(referto“Figure1.DecisionTree”onpage
5).
HumiditrolZoningAccessory(39W67).Requiredwheninstallinginsystemwith
HarmonyIIIzoningsystem.
HumiditroliscompatiblewiththefollowingLennoxthermostats:
Table 3. Compatible Lennox Thermostats
Description
ComfortSense®7500thermostat(13H14)
iComfort®E30SmartThermostat(15S64)
iComfort®M30Thermostat(15Z69)
iComfort®S30UltraSmartThermostat(12U67)
IMPORTANT
TheapprovedapplicationfortheHumiditrolunitisrestrictedtothoselistedinthe
ProductSpecicationsandpricebook
NOTE: Due to Lennox’ ongoing commitment to quality, features and options are
subject to change without notice and without incurring liability. Improper
installation, adjustment, alteration, service or maintenance can cause
property damage or personal injury. Installation and service must be
performed by a qualied installer and servicing agency.
1.3. Introduction
Humiditrol® is designed for installation with a Lennox HFC-410A split-system
outdoor unit and an air handler or a furnace with a variable speed blower. It is
designedforindoorinstallationsonlyineitherup-oworhorizontalairdischarge
applications.
NOTE: Humiditrol is not compatible with variable-capacity outdoor units!
• HumiditrolisforuseonlyonHFC-410Asystemswiththermalexpansionvalve
installed.
• Prior to installation, study the decision tree (see “Figure 1. Decision Tree” on
page 5) to conrm that all application requirements for Humiditrol installation
aremet.
• Lowambientpressureswitchtypecontroloptioncanbeappliedtothistypeof
system down to 30ºF. For low ambient kit part numbers, refer to the Product
Specicationsaccessoriessection.
NOTE: The low ambient control option (down to 0ºF) is not compatible with
Humiditrol.
Beforebeginninginstallation,besuretheHVACsystemcomponentsarecompatible
with the Humiditrol. See “Figure 1. Decision Tree” on page 5 for the system
decision tree that describes compatible components of the system. One of the
followingthermostatsisrequiredfortheHumiditrolsystem:
1.3.1. ComfortSense®7500 Thermostat
NOTE: When wiring the thermostat into the system, be sure these requirements
are met:
• Minimum18gaugethermostatwireisused.
• Maximumthermostatwirerunlengthdoesnotexceed300feet(90m).
• Totalloadfromanythermostatconnectionislessthan1amp.
1.3.2. iComfort®Family of Thermostats
NOTE: When wiring the thermostat into the system, be sure these requirements
are met:
• Minimum18gaugethermostatwireisused.
• Maximumthermostatwirerunlengthdoesnotexceed1500feet(455m)
• Totalloadfromanythermostatconnectionislessthan1amp.
1.3.3. Operation Overview
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 unit operates to dehumidify, as required, when ambient
temperaturesarebelow95ºF.
• However,whentemperaturesreach95ºF,coolinganddehumidicationdemands
are both serviced by increased cooling system run-time and does not use
Humiditrol.
• Neither the CS7500 or any of the iComfort family of thermostats will activate
Humiditrolwhentheambienttemperatureisatorabove95ºF.
• Priortosystemcheckout,considertheoutdoorambienttemperaturesincethe
Humiditrolwillnotoperateabove95ºF.
• Plantestingtobeconductedwhentemperaturesarebetween65ºFand95ºFto
ensureproperHumiditrolsetupandcheckoutoperation.
• Humiditrolremovesmoisturefromtheindoorairatagreaterratethancooling
alone. On a call for dehumidication, the indoor blower is slowed down, the
outdoorfan is operated atalowerspeed, and thecompressor isupstagedto
high-stageoperation(two-stageunits).Theindoorcoolingcoilnowoperatesasa

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lowertemperatureremovingadditionalhumidity.Atthesametime,theHumiditrol
three-wayvalvesrepositionthemselvesandtheHumiditrolcoilbecomesactive.
Thisallowscondenserheattowarmtheindoorairtoavoidexcessiveovercooling
ofthehome.Duringcoolingonly(noHumiditroloperation)theHumiditrolcoilis
inactive.
• TheHumiditrolcoilisaddedtoanHVACsystemdownstreamoftheindoorcoil.
Indehumidicationmode,thecoilbecomesanextensionoftheoutdoorcoiland
injectsheatintotheindoorairstream.
• Thisdehumidicationmodeallowssignicantlyimprovedcontrolofthehumidity
intheconditionedspacewithlesschanceofovercoolingthespace.
• The assembly includes a set of 3-way diverting valves which will either route
refrigerantthroughtheHumiditrolcoil,orcausetherefrigeranttobypassthethat
coil,dependingonthemodeofoperation.
1.3.4. Operation Notes
• Dehumidicationwillnotoccurwhentheoutdoortemperatureisatorabove95ºF
orindoortemperatureisatorbelow65ºF.
• Whenoperatingincooling(orheatpumpheating)mode,alltemperaturesand
pressureswillbeasinanormalsystem.
• WhenthethermostatisinHumiditrolmode,andafteracoolingdemandhasbeen
satisedbutadehumidicationdemandpersists,andtheroomtemperatureis
within the MIN, MID, MAX parameters described in Using Humiditrol Comfort
Adjust(see“2.7.UsingHumiditrolComfortAdjust”onpage19),theairhandlers
willoperateatreducedairowwiththecompressorathighspeed.
• When the unit is in the dehumidication mode, the thermostat will display
“dehumidifyoranicon”onthehomescreen.
IMPORTANT
TheCleanAirActof1990banstheintentionalventingofallrefrigerants(CFC,
HFC,andHCFC)asofJuly1,1992.Approvedmethodsofrecovery,recycling
or reclaiming must be followed. Fines and/or incarceration may be levied for
non-compliance
WARNING
Improperinstallation,adjustment,alteration,serviceormaintenancecancause
propertydamage,personalinjuryorlossoflife.
Installation and service must be performed by a licensed professional HVAC
installer(orequivalent)oraserviceagency.
WARNING
Riskofexplosionorre.
Cancauseinjuryordeath.
Recoverallrefrigeranttorelievepressurebeforeopeningthesystem.
1.4. Wiring Diagram Locater
Table 4. Wiring Diagram Locater
Thermostat Indoor Unit Control Outdoor Unit Control Wiring Diagram
ComfortSense 7500 or
iComfort M30 Non-communicating Non-communicating
“Figure11.CS7500
orM30withanyNon-
CommunicatingIndoor
andOutdoorUnits”on
page12.
ComfortSense 7500 or
iComfort M30 Non-communicating
Lennox
Communicating
wiredas24VAC
Conventional
“Figure12.CS7500
orM30withNon-
CommunicatingIndoor
andCommunicating
OutdoorUnits
WiredforNon-
Communicating”on
page13.
ComfortSense 7500 or
iComfort M30
Lennox
Communicatingwired
asnon-communicating
Lennox
Communicatingwired
asnon-communicating
“Figure13.CS7500
orM30with
CommunicatingIndoor
andOutdoorUnits
withBothWiredNon-
Communicating”on
page14.
iComfort E30
Lennox
Communicatingwired
asnon-communicating
Lennox
Communicatingwired
asnon-communicating
“Figure14.E30
withbothIndoor
andOutdoor
Communicating
UnitsWiredforNon-
Communicating”on
page15.
iComfort S30 Lennox
Communicating
Lennox
Communicating
“Figure15.S30
WiredSystemfor
Communicating”on
page16.

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1.5. Decision Tree
Upflow/Horizontal
NOTE − AIR HANDLER REQUIRES
FIELD-FABRICATED TRANSITION
BETWEEN BLOWER OUTLET AND
EDA COIL.
[If
furnace]
Select
indoor
coil
MUST BE
TXV ONLY
Select EDA
Zoning
application?
START
Must use one of
these variable speed
indoor units:
CBA25UHV, CBA27UHE, CBA38MV, CBX27UH,
CBWMV, EL296UHV, EL296DFV,
ML296UHV, ML296DFV
SL280UHV, SL280UHNV, SL280DFV,
SL297UHNV, SLP98UHV, SLP98DFV ONLY!!
*Must use one of
these outdoor units:
YES NO YES
Is
selection a
certified AHRI rated
system (https://www.
ahridirectory.org)
Downflow
NOTE - REQUIRES ADDITIONAL
FIELD-FABRICATED SUPPORT
FRAME AND TRANSITION; SEE
INSTALLATION SUPPLEMENT,
“Installing Humiditrol®Unit in
Downflow Configuration”.
Upflow/
Horizontal Downflow
How
installed
?
YES
INSTALL SYSTEM
Order Humiditrol®Zoning
Accessory (HZA) Kit (39W67)
REFER TO INSTALLATION INSTRUCTION,
“Installing The Humiditrol®Enhanced
Dehumidification Accessory (EDA) In A
Harmony III™ Zoning System Using The
Humiditrol®Zoning Accessory”
Application
Not Approved
DO NOT
INSTALL!
NO
Harmony
III™ Zoning
System
?
YES
Select Piping Kit
NO
Select different equipment
X = PREFERRED MATCH-UP
A = ALLOWED FOR PHYSICAL MATCH-UP TO INDOOR COIL
Capacity
HUMIDITROL®EDA MODEL
EDA-024B
(94M41)
EDA-036C
(94M42)
EDA-060D
(94M43)
-018 XA
-024 XA
-030 XA
-036 XA
-042 X
-048 X
-060 X
*Not applicable to variable-capacity outdoor units!
13ACXN, 14ACX, 16ACX, EL16XC1, ML14XC1,
SL18XC1, SSB, TSAH4, TSAS4, XC13N, XC14,
XC16, XC21 ONLY!
14HPX, 16HPX, EL15XP1, EL16XP1, ML14XP1,
ML16XP1, SL18XP1, SPB, TPAH4, XP14,
XP16, XP21 ONLY!
Capacity Type Outdoor Unit Model Piping Kit
018 AC 13ACXN, 14ACX, EL16XC1, ML14XC1, XC13N, XC14 98M62
HP 14HPX, EL15XP1, EL16XP1, ML14XP1, ML16XP1, XP14 98M22
024 AC 13ACXN, 14ACX, EL16XC1, ML14XC1, SL18XC1, XC13N, XC14, XC21 98M62
16ACX, XC16 98M22
XC21 94M44
HP 16HPX, SL18XP1, XP16, XP21 94M44
14HPX, EL15XP1, ML14XP1, XP14 98M62
EL16XP1, ML16XP1 98M22
030 AC 13ACXN, 14ACX, 16ACX, EL16XC1, ML14XC1, SL18XC1, XC13N, XC14 98M62
HP 14HPX, EL15XP1, ML14XP1 98M62
EL16XP1, ML16XP1, SL18XP1 98M22
036 AC 13ACXN, 14ACX, 16ACX, EL16XC1, ML14XC1, SL18XC1, SSB, TSAH4, TSAS4,
XC13N, XC14, XC16
98M62
XC21 94M44
HP 14HPX, 16HPX, EL15XP1, ML14XP1, SPB, TPAH4, XP14, XP16, XP21 94M44
EL16XP1, ML16XP1, SL18XP1 98M22
042 AC 13ACXN, 14ACX, EL16XC1, ML14XC1, SL18XC1, TSAH4, TSAS4, XC13N, XC14 98M62
HP 14HPX, TPAH4, XP14 94M44
EL15XP1, EL16XP1, ML14XP1, ML16XP1, SL18XP1 98M22
048 AC 13ACXN, 14ACX, 16ACX, EL16XC1, ML14XC1, SL18XC1, SSB, TSAH4, TSAS4,
XC13N, XC14, XC16
98M62
XC21 94M44
HP XP21 94M44
14HPX, 16HPX, EL15XP1, EL16XP1, ML14XP1, ML16XP1, SL18XP1, SPB,
TPAH4, XP14, XP16
98M22
060 AC 13ACXN, TSAS4, XC13N 98M62
14ACX, 16ACX, EL16XC1, ML14XC1, SL18XC1, SSB, TSAH4, XC14, XC16 98M22
XC21 94M44
HP 16HPX, EL15XP1, EL16XP1, ML14XP1, ML16XP1, SPB, XP16 98M22
14HPX, SL18XP1, TPAH4, XP14, XP21 94M44
iComfort®
E30, M30 or
ComfortSense®
7500?
NO
YES
Figure 1. Decision Tree

6
1.6. Unit Dimensions
EDA Model Dimensions - Inches (mm)
11/16
(17)
20-3/4
(527)
D
OUTLET
AIR
OPENING
11/16
(17)
11/16 (17)
11/16 (17)
Dimension EDA-024B EDA-036C EDA-060D
A17-1/2 (445)21 (533)24-1/2 (622)
B12-1/4 (311) 12-1/4 (311) 14 (356)
C16-1/8 (422)19-5/8 (498) 23-1/8 (587)
D16-1/8 (422)19‐5/8 (498) 23-1/8 (587)
E1-3/8 (35)3-1/8 (79) 4-7/8 (124)
F3-1/8 (79)4-7/8 (124)6-5/8 (168)
G3 (76)3-1/4 (83) 4-3/4 (121)
1-7/16 (37)
20-1/8
(511)
22-1/4
(565)
11/16 (17)
GNINEPORIATELNIGNINEPORIATELNI
9-1/2
(241)
11/16 (17)
C
B
A
E
G
F1-3/4
(44)
11/16 (17)
1
(25)
2-1/2
(64)
Check/Flow Restrictor
to Vapor Line Te e
Liquid Line
From Outdoor
Unit
Liquid Line to
Indoor TXV
Electrical
Inlet
To Charge Compensator
side connection
AIR FLOW
Figure 2. Unit Dimensions

7
1.7. Installation Conguration
1.7.1. Horizontal and Up-ow
AIR FLOW
AIR FLOW
UP‐FLOW FURNACE
UP‐FLOW AIR HANDLER
EDA-024B: 12-1/2”
EDA-036C: 12-1/2”
EDA-060D: 14”
Varies by indoor
coil model; see
LENNOX
Product
Specifications.
Varies by air
handler model;
see LENNOX
Product
Specifications for
dimensions.
TYPICAL HORIZONTAL
POSITION (Furnace
Shown)
HUMIDITROL
UNIT
FURNACE
INDOOR
COIL
12” (min.)
NOTES:
1. Transition is required for all air handlers; dimension width and depth is
dependent upon the air handler and the Humiditrol model used.
2. Transition is required between indoor coil and 5-ton Humiditrol unit when
used with a small profile furnace.
Alternate installation position information - The Humiditrol coil is not posi-
tion sensitive as long as the correct air flow direction through the coil is
maintained. See Unit Dimensions drawing on page 3 for correct air flow.
TYPICAL UP-FLOW
POSITION (Furnace
Shown)
(TRANSITION
See Note 2)
TRANSITION
(See Note 1)
Varies by
furnace model;
see LENNOX
Product
Specifications for
dimensions.
Figure 3. Installation Arrangements (Horizontal and Up-ow)

8
1.7.2. Down-ow
Thisaccessoryisdesignedforindoorinstallationsineitherup-oworhorizontalairdischargeapplications,however,theunitwillfunctioninthedown-owconguration,
providedtheinstructionscontainedhereinarefollowed.
HUMIDITROL
UNIT
Furnace Configuration
INDOOR
COIL UNIT
INSULATED
TRANSITION
FIELD
CONSTRUCTED
SUPPORT
STAND
Air Handler Configuration
INSULATED
TRANSITION
FIELD
CONSTRUCTED
SUPPORT
STAND
HUMIDITROL
UNIT
Figure 4. Typical Down-ow Congurations for both Air Handler and Gas Furnace

9
EDA−036C: 12−1/2" (318 mm)
EDA−060D: 14" (356 mm)
RETURN AIR PLENUM
FURNACE
FIELD-CONSTRUCTED
SUPPORT STAND
INDOOR COIL UNIT
(INSULATED TRANSITION
HUMIDITROL
UNIT
6" (152 mm) Min.
NOTE −The weight of the indoor coil
and furnace MUST be supported by the
field−contructed support stand − NOT by
transition and Humiditrol coil
VARIES BY INDOOR COIL
MODEL; SEE LENNOX
PRODUCT SPECIFICATION
40 (1016 mm)
Figure 5. Typical Down-ow Furnace
Typical Downflow Air Handler
RETURN AIR PLENUM
AIR HANDLER
FIELD-CONSTRUCTED
SUPPORT STAND
(INSULATED TRANSITION
HUMIDITROL
UNIT
NOTE − The weight of the air handler
MUST be supported by the
field−contructed support stand − NOT by
transition and Humiditrol coil
EDA−036C: 12−1/2" (318 mm)
EDA−060D: 14" (356 mm)
6" (152 mm) Min.
VARIES BY AIR HANDLER
MODEL; SEE LENNOX
PRODUCT SPECIFICATION
FOR DIMENSIONS.
Figure 6. Typical Down-ow Air Handler
Field construct the brackets.
CAUTION! When determining where holes in
the units are to be located and the length of
screws to be used, be sure internal
components will not be jeopardized nor
damaged during assembly.
NOTE − Coil weight must not rest on
transition.
Using the field-constructed brackets, assemble
EDA, transition, and indoor coil, fastening the
brackets to the coil and Humiditrol units with
field−supplied screws.
Move assembled lower package into position (for
example, in the a/c closet).
If location permits, and for better stability, fasten
rear support stand bracket to a wall.
Install and fasten return air plenum to the top
of the unit and secure to wall(s); this will en-
sure the assembly does not tilt forward.
Maneuver furnace into closet, on top
of the coil and between the brackets.
ASSEMBLED HUMIDITROL,
INDOOR COIL AND
TRANSITION
FURNACE
PLENUM
Study the installation site carefully before beginning
installation. These instructions are intended to show a
typical application. Because most sites are different, use
this information as a general guide, making adjustments
if and when necessary, observing all cautions and notes,
and following appropriate ordinances and regulations.
Figure 7. Typical Down-ow Furnace Installation
Field construct the brackets.
CAUTION! When determining where holes in
the units will be located and the length of
screws to be used, be sure internal
components will not be jeopardized nor
damaged during assembly.
NOTE − Air handler weight must not rest on
transition.
Using the field-constructed brackets, assemble the
Humiditrol and transition. If the height of the
opening permits, assemble the air handler as well.
PLENUM
Install and fasten return air plenum to the
top of the unit and secure to wall(s); this
will ensure the assembly does not tilt for-
ward.
If the opening’s height will not accomodate
the entire assembly, move the bottom part
in first, then the air handler. Until it is prop-
erly fastened, be sure to support the weight
of the air handler so that it does not rest on
the transition.
If location permits, and for better stability,
fasten rear support stand bracket to a wall.
Study the installation site carefully before beginning
installation. These instructions are intended to show a
typical application. Because most sites are different, use
this information as a general guide, making adjustments
if and when necessary, observing all cautions and notes,
and following appropriate ordinances and regulations.
CUTAWAY OF CLOSET
DOOR
OPENING
MOVE TOP OF
AIR HANDLER IN
THEN UP
...THEN ROTATE
BOTTOM END
INTO CLOSET
AIR HANDLER
Figure 8. Typical Down-ow Furnace Installation

10
1.8. Component Functions
1.8.1. Charge Compensator
The charge compensator included in the Installation and Piping kit as shown in
“Figure 17. Typical Installation (Horizontal Air Handler Shown)” on page 18
servestomaintaintheproperamountofrefrigerantcirculatingincertainsystems.
(Some systems do not require a charge compensator, but do require a similar
Installation and Piping kit to connect into the system [see Product Specications]).
The charge compensator stores excess refrigerant when the Humiditrol coil is
active(dehumidifying)andreturnsittothesystemduringnormalcoolingorheating
operations.WhentheHumiditrolcoilisactive,lesschargeisrequiredtoobtainthe
properamountofsub-coolingbecauseoftheadditionalcoilsurfaceandthecooler
airwhichpassesovertheHumiditrolcoil.
1.8.2. Check/Flow Restrictor
The check function of the check/ow restrictor (shown in Figure 9) prevents
refrigerant from owing into the inactive components during times when the
Humiditrolcoilisinactive.Theowrestrictorcontrolstherateofreturnofchargeto
thesystemfromthechargecompensatorandtheHumiditrolcoilwhenthesystem
changesfrom”Humiditrolcoilactive”to”Humiditrolcoilinactive.”
1.8.3. Valve Assembly
The rst valve of the diverting valve assembly (gure 10, E) directs the ow of
refrigeranttoeitherbypasstheHumiditrolcoil(Humiditrolcoilisinactive)orpass
throughtheHumiditrolcoil(Humiditrolcoilisactive).Thesecondvalve(gure10F)
directstheowofrefrigerantbacktotheliquidlinewhentherstvalve(E)allows
owthroughtheHumiditrolcoil.WhentheHumiditrolcoilisinactive,thesecond
valve(F)providesaventpathtothesuctionline,drainingtheHumiditrolcoiland
chargecompensatorofliquidrefrigerant.
O-RING SEALS
CHECK/FLOW
RESTRICTOR
CHECK/FLOW
RESTRICTOR
“FLOATS IN
CHATLEFF
CONNECTOR
GREATER
PRESSURE
EDA
UNIT
GREATER
PRESSURE
EDA
UNIT
FROM
VAPOR
LINE
TEE
FROM
VAPOR
LINE
TEE
Figure 9. Check/Flow Restrictor Operation
EDA-024B
D060-ADE
C630-ADE
3-WAY DIVERTING VALVE ASSEMBLY
HUMIDITROL COIL
3-WAY DIVERTING VALVE ASSEMBLY
A- Liquid Line From Outdoor Unit
B- Liquid Line to Indoor TXV
C- Check/Flow Restrictor to VaporLine Te e
AB CD
HUMIDITROL COIL
HUMIDITROL COIL
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- HUMIDITROL inactive mode - bypasses the HUMIDITROL HUMIDITROL active mode - allows
refrigerant flow through HUMIDITROL
F- HUMIDITROL inactive mode - vent path to suction line; EDA active mode - directs refrigerant flow back to
liquid line.
EF
FE
3-WAY DIVERTING VALVE ASSEMBLY
EF
AB CD
AB CD
Figure 10. Humiditrol Unit Parts Arrangement