These instructions must be read and understood completely before attempting installation.

Safety Labeling and Signal Words

DANGER, WARNING, CAUTION, andNOTE

The signal words DANGER, WARNING, CAU-TION, and NOTE are used to identify levels of haz-ard seriousness. The signal word DANGER is onlyused on product labels to signify an immediate haz-ard. The signal words WARNING, CAUTION, andNOTE will be used on product labels and through-out this manual and other manuals that may applyto the product.

DANGER - Immediate hazards which will result insevere personal injury or death.

WARNING - Hazards or unsafe practices whichcould result in severe personal injury or death.

CAUTION - Hazards or unsafe practices whichmay result in minor personal injury or product orproperty damage.

NOTE - Used to highlight suggestions which willresult in enhanced installation, reliability, or opera-tion.

Signal Words in Manuals

The signal word WARNING is used throughout thismanual in the following manner:

The signal word CAUTION is used throughout thismanual in the following manner:

Signal Words on Product Labeling

Signal words are used in combination with colorsand/or pictures on product labels.

TABLE OF CONTENTS

Introduction .................................... 2

Location ....................................... 2

Position Unit ................................... 4

Air Ducts ...................................... 5

Electrical Connections .......................... 5

Refrigerant Tubing .............................. 6

Refrigerant Metering Device ..................... 6

Condensate Drains ............................. 6

Schematic ..................................... 8

Sequence of Operation ......................... 10

Care and Maintenance ......................... 10

Parts ........................................ 11

DEATH, PERSONAL INJURY, AND/OR PROPERTYDAMAGE HAZARD

Failure to carefully read and follow this warningcould result in equipment malfunction, propertydamage, personal injury and/or death.

Installation or repairs made by unqualified per-sons could result in equipment malfunction, prop-erty damage, personal injury and/or death.

The information contained in this manual is in-tended for use by a qualified service technician fa-miliar with safety procedures and equipped withthe proper tools and test instruments.

Installation must conform with local buildingcodes and with the National Electrical CodeNFPA70 current edition.

Specifications are subject to change without notice 496 01 2100 02 June 2006

I _:o_: .......l_I',l_ _!I_ .......

Figure 1 Clearances and Unit Dimensions

" X _ _w" / "

REQUIRED CLEARANCES (inches)

All Sides 0All

Models Serviceability from the front 30From Supply Duct 0

Size all dimensions inches Coil Ship.Weight

Model (tons) A B C D E F G Liquid Suct. Type (tbs)

AHX32400 2 171/2 21 15 171/2 16 125/8 403/4 3/8 3/4 "A" 144

AHX33600 3 171/2 21 15 171/2 16 125/8 403/4 3/8 3/4 "A" 144

AHX34800 4 211/2 25 191/4 221/4 195/8 171/4 493/4 3/8 7/8 "A" 192

AHX36000 5 211/2 25 191/4 221/4 195/8 171/4 493/4 3/8 7/8 "A" 192

INTRODUCTION

Models AHX3 are designed for an upfiow vertical applica-tions.

All models are available for system sizes 2 - 5 tons(24,000 - 60,000 BTUH) nominal cooling capacity.

All models have a factory installed 15% bleed port TXVdesigned for use with R-22 refrigerant. AHX3 are for

LOCATION

Select the best position which suits the installation siteconditions. The location should provide adequate struc-tural support, space in the front of the unit for service ac-cess, clearance for return air and supply ductconnections, space for refrigerant piping connections and

R-22 refrigerant ONLY. Use only with outdoor units de-signed for R-22

An accessory R410A TXV kit is available through the dis-tributor. AHTXV153 (2 - 3 ton) or AHTXV355 (4 - 5 ton)

condensate drain line connections. See Clearances inFigure 1.

If the unit is located in an area of high humidity, nuisancesweating of casing may occur. On these installations a

2 Specifications aresubject to changewithout notice 496 01 2100 02

wrap of 2" fiberglass insulation with a vapor barrier is rec-ommended.

NOTE: Internal filter can be accessed from separate filterdoor. If the filter can NOT be easily accessed, a remotefilter is recommended. Refer to ACCA Manual D for re-mote filter sizing.

FIRE HAZARD

Failure to maintain proper clearances could resultin personal injury, death, and/or property damage.

When heaters are installed, maintain clearancesfrom combustible materials as specified on unitrating plate. Do not use plastic lined or combus-tible flexible ducting within 36 inches of the supplyend of the fan coil.

Figure 2

Model No

Blower Data

Airflow Motor @ 230V DDTonnage 1 Ph 60 Hz Blower 3-Spd

MotorRange HP FLA Wheel

AHX32400 1.5-2.0 1/4 1.7 10x6

AHX33600 2.5-3.0 1/3 2.8 10x7

AHX34800 3.0-4.0 1/3 3.1 10x8

4.0-5.0 3/4 4.8 11x9AHX36000

Notes:

H

M

L

H

M

L

H

M

L

H

M

L

SCFM vs, ESP (1) (2)Duty

,1 ,2 ,3 ,4 ,5

Cool 950 900 850 790 720

Cool 950 900 850 790 720

Heat 950 900 850 790 720

Cool 1250 1200 1120 1060 1000

Cool 1070 1020 970 920 860

Heat 900 870 840 790 720

Cool 1850 1700 1650 1500 1410

Cool 1750 1650 1450 1330 1180

Heat 1150 1060 1000 920 810

Cool 2160 2100 2000 1940 1880

Cool 2110 1980 1810 1750 1650

Heat 2000 1860 1670 1340 1200

(1) Based upon unit with nominal tannage dry coil and filter installed,(2) Use ,96 as approximate SCFM correction factor for wet coil,

Figure 3 1

Fan Coil

Model

AHX3

2400

3600

48OO

6000

Electric Heat Performance Data

Heater

Model No.

None

HTR05BS 1

HTR10BS 1

None

HTR05BS1

HTR10BS1

HTR15BS1

None

HTR05BL1

HTR10BL1

HTR15BL1

HTR20BL1

None

HTR10BL1

HTR15BL1

HTR20BL1

Nominal

SCFM

800

to

900

1020

to1200

1250to

1750

1980to

2100

Nominal

CoolingBTUH

18,000

to

24,000

30,000

to

36,000

42,000to

48,000

48,000to

60,000

KWElectric

240V 208V0 0

5 3.810 7.5

0 05 3.8

10 7.515 11.3

0 05 3.810 7.5

15 11.320 15

0 010 7.515 11.3

20 15

Min. Circuit

240V 208V

2.2 1.9

30 27

56 49

3.1 3.0

30 27

56 49

56/26 49/23

3.1 3.0

30 27

59 52

53/27 46/24

59/53 52/46

6.0 5.9

59 52

56/27 49/24

59/53 52/46

240V I15

30

60

15

30

60

60/30

15

30

60

60/30

60/60

1560

60/30

60/60

208V15

3050

15

30

60

50/30

15

30

60

50/30

60/50

15

60

50/30

60/50

496 01 2100 02 Specifications aresubject to changewithout notice 3

POSITION UNIT

Unit is designed to be installed in a closet or flushmounted. Can be serviced entirely from the front, includ-ing replacing the filter. Allow space for wiring, piping, andservicing unit.

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in proper-ty damage

A field fabricated auxiliary drain pan, with a sepa-rate drain is REQUIRED for all installations over afinished living space or in any area that may bedamaged by overflow from a restricted main drainpan. In some localities, local codes require an aux-iliary drain pan for ANY horizontal installation.

A. UPFLOW INSTALLATION

If return air is to be ducted through a floor, set unit on floorover opening and use 1/8 to i/4 inch thick fireproof resil-ient gasket between duct, unit, and floor.

Exterior surface may sweat when unit is installed in non-conditioned space. Installer must provide protection suchas full size auxiliary drain pan on all units installed in non-

conditioned space to prevent damage from condensationrunoff. It is recommended that units be insulated with 1"thick fiberglass with the vapor barrier on the outside.

B. HORIZONTAL APPLICATION

Units are shipped in right to left configuration. Horizontalapplications require a return air duct be attached to thefurnace inlet. The opposite end of the return air duct is at-tached to a return air filter grill through the ceiling or wall.

For left to right applications:

1. Remove and set aside front panels.

2. Remove the coil support bracket (4 screws).

3. Remove horizontal drain pan retaining clip (1screw).

4. Carefully remove coil assembly and bottom drainpan.

5. Move Horizontal drain pan from left hand side ofcoil to right.

6. Install modified coil assembly back into unit.

7. Reinstall coil support bracket and horizontal drainpan retaining clip.

8. Determine drain holes being used and repositionknockout caps.

9. Reinstall doors.

AIR DUCTS

Connect supply-air duct over the outside of %" flangesprovided on supply-air opening. Secure duct to flange us-ing proper fasteners for type of duct used, and seal duct-to-unit joint. If return-air flanges are required, installfactory authorized accessory kit.

Use flexible connectors between duct work and unit toprevent transmission of vibration. Duct work passingthrough unconditioned space must be insulated and cov-ered with vapor barrier to prevent formation of conden-sate to prevent formation of condensate.

Duct work Acoustical Treatment

Metal duct systems that do not have a 90 degree elbowand 10 feet of main duct before first branch takeoff mayrequire internal acoustical insulation lining. As an alterna-tive, fibrous duct work may be used if constructed andinstalled in accordance with the latest edition of SMACNAconstruction standard on fibrous glass ducts. Both acous-tical lining and fibrous duct work shall comply with Nation-al Fire Protection Association as tested by UL Standard181 for Class 1 air ducts.

ELECTRICAL CONNECTIONS

Refer to the unit's nameplate for specific electrical data.

Before proceeding with electrical connections, make cer-tain that supply voltage, frequency, phase, and circuit am-pacity are as specified on the unit rating plate. Make allelectrical connections in accordance with the NEC andany local codes or ordinances that may apply. Use cop-per wire rated for 75 degrees C minimum wire in the unitwiring compartment only. A single power supply may beconnected directly to terminal block provided in the unit.

ELECTRICAL SHOCK or UNIT DAMAGE HAZARD

Failure to follow this warning could result in per-sonal injury, death, and/or unit damage.

If a disconnect switch is to be mounted on unit, se-lect a location where drill and fasteners will notcontact electrical or refrigeration components.

4 Spe¢ificationsaresubiect to changewithout notice 496 01 2100 02

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in per-sonal injury or death.

Turn off the main (remote) disconnect device be-fore working on incoming (field) wiring.Incoming (field) wires on the line side of the dis-connect found in the fan coil unit remain live, evenwhen the pull-out is removed. Service and main-tenance to incoming (field) wiring cannot be per-formed until the main disconnect switch (remoteto the unit) is turned off.

A. LINE VOLTAGE CONNECTIONS

This Fan Coil is not electric heat compatable.

1. Connect 208/240V power leads from field discon-nect to units high voltage terminal block.

2. Connect ground wire to unit ground lug.B. 24V CONTROL SYSTEM

Connection to Unit

Wire low voltage in accordance with wiring label on theunit. Use 18 AWG color-coded, insulated (35 degrees Cminimum) wire to make the low-voltage connections be-tween the thermostat, the unit, and the outdoor equip-ment. If the thermostat is located more than 100 feet from

the unit (as measured along the low voltage wire), use 16AWG color-coded, insulated (35 degrees C minimum)wire. All wiring must be NEC Class 2 and must be sepa-rated from incoming power leads. Refer to outdoor unitwiring instructions for additional wiring recommenda-tions.

NOTE: Before proceeding with electrical connections,make certain that supply voltage, frequency, phase, andcircuit ampacity are as specified on the unit rating plate.See unit wiring label for proper field high and low voltagewiring. Make all electrical connections in accordance withthe NEC and any local codes or ordinances that may ap-ply. Use copper wire only. The unit must have a separatebranch electric circuit with a field-supplied disconnectswitch located within sight from, and readily accessiblefrom the unit.

Transformer Information

Transformer is factory wired for 208/240V operation.

Figure 4 L Transformer Connections

_L_% 24VAC

BLA:CK

ll_m ==== m RED

11_ANSFORME8

C. GROUND CONNECTIONS

ELECTRICALSHOCKHAZARD

Failure to establish uninterrupted or unbrokenground could result in personal injury and/ordeath.

According to NEC, ANSI/NFPA 70, and localcodes, the cabinet must have an uninterrupted orunbroken ground in order to minimize potentialfor personal injury or death if an electrical faultshould occur. The ground may consist of electri-cal wire or metal conduit when installed in accor-dance with existing electrical codes. If conduitconnection uses reducing washers, a separateground wire must be used.

NOTE: Use UL listed conduit and conduit connectors forconnecting supply wire(s) to unit to obtain proper ground-ing. Grounding may also be accomplished by usinggrounding lugs provided in control box.

D. MINIMUM CFM AND MOTOR SPEED SELECTION

Units require a minimum CFM. Refer to the unit wiring la-bel to ensure that the fan speed selected is not lower thanthe minimum fan speed indicated.

Fan speed selection is done at the fan relay. To changemotor speeds, disconnect fan lead used on relay terminal(FR) and replace with motor speed lead desired (refer toFigure 8). Save insulating cap and place on motor leadremoved from relay.

496 01 2100 02 Specifications aresubiect to changewithout notice 5

NOTE: In low static applications, lower motor speed tapshould be used to reduce possibility of water being blownoff coil.

All units have three (3) motor speed taps. Low speed (redor 4) is designed for mismatch outdoor unit applications.

Medium speed (blue or 3) is designed for straightmatched operations. High speed (black or 2) is used withhigh external static duct situations on straight matchedsystems.

REFRIGERANT TUBING

Size and install refrigerant lines according to informationprovided with outdoor unit. Route refrigerant lines to thefan coil in a manner that will not obstruct service access tothe unit or removal of the filter.

1. Find the liquid tube grommet in the small-parts bagand slide it onto the liquid refrigerant line (field line-set).

2. Remove the lower door. Remove the tubing plate(with suction tube grommet) and slide the plate withgrommet onto the refrigerant lines (field line-set),away from braze joints.

3. Using a tubing cutter, carefully cut approximately1/2" off of the suction and liquid line stubs. Thesecoils are pressurized with a nitrogen holdingcharge, Cut the first stub, either the suction or liquidline slowly to allow the pressure to escape beforecutting all the way through the entire stub.

4. Wrap TXV and nearby tubing with a heat-sinkingmaterial such as a wet cloth.

5. Fit refrigerant lines into coil stubs. Wrap a heat sink-ing material such as a wet cloth behind braze joints.

6. Braze using a SiI-Fos or Phos-copper alloy.7. After brazing, allow joints to cool. Slide tubing plate

back into place and position grommets around suc-tion and liquid tubes to ensure air seal.

PRODUCT DAMAGE HAZARD

Failure to follow this caution may result in productdamage.

Braze with SiI-Fos or Phos-copper alloy on cop-per-to-copper joints and wrap a wet cloth aroundrear of fitting to prevent damage to TXV.

REFRIGERANT METERING DEVICE

These Fan Coils have a factory installed 15% bleed portTXV designed for use with R-22 refrigerant. Use only withoutdoor units designed for R-22.

TXV is factory set and not field adjustable. PRODUCT DAMAGE HAZARD

Failure to follow this caution may result in productdamage.

This Fan Coil has a hard shut-off TXV metering de-vice. A compressor Hard Start Kit is REQUIRED inall applications where the matching outdoor unithas a single-phase reciprocating compressor.

CONDENSATE DRAINS

Unit is provided with primary and secondary 3/4"NPT drainconnections. Refer to Figure 7 to identify the primary andsecondary locations. To prevent property damage andachieve optimum drainage performance, BOTH primaryand secondary drain lines should be installed and includeproperly sized condensate traps. Factory approved con-densate traps are available (accessory part numberEBAC01 CTK).

Install traps in the condensate lines as close to the coil aspossible (refer to Figure 7), but avoid blocking filter ac-cess panel.

Install drain lines below the bottom of the drain pan andpitch the drain lines down from the coil at least ¼ inch perfoot of run. Horizontal runs over 15 feet long must alsohave an anti-siphon air vents (stand pipes), installedahead of the horizontal runs. Extremely long horizontalruns may require oversized drain lines to eliminate airtrapping.

Route primary drain line to the outside or to a floor drain.Check local codes before connecting to a waste (sewer)line.

Route the secondary drain line to a place in compliancewith local installation codes where it will be noticed whenunit is operational. Condensate flowing from secondary(overflow) drain indicates a plugged primary drain - unitrequires service or water damage will occur.

PRODUCT or PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in productor property damage.

Use only full size P-traps in the condensate line(refer to Figure 5). Shallow, running traps are inad-equate and DO NOT allow proper condensatedrainage (refer to Figure 6).

6 Specificatio._a,esubiect to changewithout notice 496 01 2100 02

Prime all traps, test for leaks, and insulate drain lineswhere sweating could cause water damage. Consult localcodes for additional requirements or precautions.If a gravity drain cannot be used, install a condensatepump. Install the pump as close to the indoor section aspossible.

Be sure to install plastic push-in plugs in unused conden-sate drain holes.

PRODUCT DAMAGE HAZARD

Failure to follow this caution may result in poorunit performance and/or product damage.

Never operate unit without a filter. Factory autho-rized filter kits must be used when locating the fil-ter inside the unit. For those applications whereaccess to an internal filter is impractical, a field-supplied filter must be installed in the return ductsystem.

Figure 5 I Recommended Condensate Trap

2" MIN

Figure 6 [ Insufficient Condensate Trap

DO NOT USE SHALLOW RUNNING TRAPS!

Figure 7 [ Condensate Drain

00

-FILTERACCESS

PANEL

SECONDARY DRAIN WITHAPPROPIATE TRAP REQUIRED

(USE FACTORY KIT ORFIELD - SUPPLIED TRAP)

PRIMARY TRAP REQUIRED (USE FACTORY KIT ORFIELD - SUPPLIED TRAP OF PROPER DEPTH.STANDARD P - TRAPS ARE NOT SUFFICENT. SEEFIGURE OF RECOMMENDED CONDENSATE TRAP)

496 01 21 O0 02 Specifications aresubject to changewithout notice 7

I _:o_: .......I_NS _!I_ .......

Figure 8 1 Wiring Layout - Cooling

Ii

o o

II

i i

m

iiii|

I I

I I o

Il|

I _ I I' :o

r

8 Specificatiolls aresubiect to changewithout notice 496 01 21 O0 02

Figure 9 1 Wiring Layout - Electric Heating

ii I__I _ _

I

I I I --"_I I I I

....... ._L..!q_-_ -.io

_&__

496 01 21 O0 02 S_ec]fic.tio._aresubiect to changewithoutnotice 9

SEQUENCE OF OPERATION

A. CONTINUOUS FAN

Thermostat closes R to G.

G energizes Time Delay Relay (TDR).

Time Delay Relay (TDR) energizes Fan Relay (FR)within 30 seconds.

When Fan Relay (FR) is energized, circuit is com-plete to Indoor Blower Motor.

When G is de-energized, there is a 3 second delaybefore Fan Relay (FR) opens.

B. COOLING MODE

Thermostat closes R to G, R to Y, and R to O (heatpump only).

G energizes Time Delay Relay (TDR). Y energizesCondense contactor, and O energizes the reversingvalve (heat pump only)Time Delay Relay (TDR) energizes Fan Relay (FR)within 30 seconds.

When Fan Relay (FR) is energized, circuit is com-plete to Indoor Blower Motor.

When G is de-energized, there is a 3 second delaybefore Fan Relay (FR) opens.

SAFETY SWITCHES

Unit is equipped with a limit switch for each sepa-rate heating element.

These switches are normally closed and are set toopen at170 ° EBlower continues running until unit has cooledenough (below set point) for switches to automati-cally reset.

C. HEATING MODE

Thermostat closes R to W and R to G.

W closes the Heat Sequencer(s) to switch line volt-age from Terminals 1 and 4 to Terminals 3 and 5,which energizes the Heating Elements.

G energizes the Time Delay Relay (TDR).

Time Delay Relay (TDR) energizes Fan Relay (FR)within 30 seconds.

When Fan Relay (FR) is energized, circuit is com-plete to Indoor Blower motor.

When G is de-energized there is a 3 second delay.

CARE AND MAINTENANCE

The system should be regularly inspected by a qualifiedservice technician. Consult the servicing dealer for rec-ommended frequency.

Between visits, the only consumer service recommendedor required is air filter maintenance and condensate drainoperation.

Air Filter

Air handlers are factory equipped with an air filter. If thereturn grille has its own filter, it is not recommended toinstall a filter in the Air handler.

Inspect air filters at least monthly and replace or clean asrequired. Disposable type filters should be replaced. Re-usable type filters may be cleaned by soaking in mild de-tergent and rinsing with cold water. Install filters with thearrows on the side pointing in the direction of air flow.

Condensate Drain

During the cooling season check at least monthly for freeflow of drainage and clean if necessary.

10 Specification_a,esubiect to changewithout notice 496 01 2100 02

AHX3 Series

NOTE: This illustration is for

reference only. Your unit may

differ in appearance or may notinclude all components shown.

@38- 11- 87a

496 01 21O0 02 Speciticatio_ls aresubject to changewithoutnotice 11

REPLACEMENT PARTS - AHX3 I

KEYNO.

1234581010101111111212121213131313141415151516161619191919

AABBCCDDEFFG

DESCRIPTIONBOARD TERMINAL LINE VOLTBOARD TERMINAL LO VOLTGROUND LUG

TRANS 208/240 24 40VARELAY BLOWER DPDTRELAY TIME DELAYCAPACITOR 370 V 10 MFDCAPACITOR 370 V 15 MFDCAPACITOR 370 V 5 MFD

MOTOR BLR 1/230 1/3MOTOR BLR 1/230 3/4MOTOR BLR 1/230 1/4WHEEL DD 10X6WHEEL DD 10X7WHEELDD10X8WHEEL DD 11 X 9BLOWER ASSY

VALVE TXV 1,5-3,0VALVE TXV 3,0 - 5,0PAN DRAIN VERTICAL

PAN DRAIN HORIZONTAL

EVAR COIL

GASKET/WASHER TEFLONSTUB KIT 3/8"TOP PANEL

BLOWER/CONT, BOX DOOR

CLOSURE DOOR

ACCESS DOOR

CAPACITOR CLAMPFILTER DOOR

THUMB SCREW

O O O OO O O O

X X X X"r "r "r -r

PART NO,

R88DC0018 I I I I

R88DC0017 I I I I

R88DC0001 I I I I

R88_J_,0003 I I I I

R68AB0001 1 1 1 1R68AC0003 1 1 1 1R68DE0001 - 1 1R68DE0002 - - 1R68DE0003 1 -R65BP0014 - 1 1R65BP0006 - - 1R65BP0016 1 -R69AC0001 1 -R69AC0002 - 1 -R69AB0001 - 1R69AC0003 - - 1BRA3441 - 1 -BRA4541 1 -BRA5515 - 1BRA51-15 - - 1

R72DB0005 1 1 -R72DB0006 - 1 1R71AA0015 - 1R71AA0026 1 1 -R71AA0028 - - 1R71AA0029 1 1 -R71AA0031 - 1R71AA0045 - - 1

CA024A862T41A 1 -CA036A8E2T41A - 1 -CA048A6E5X15A - 1CA060A6E5X15A - - 1

R72BA0003 1 1 1 1R86FJ0202 1 1 1 1R871AE017 1 1 -R871X0013 - 1 1R871FC001 1 1 -R871XB001 - 1 1R871FBX07 1 1 -R871XA004 - 1 1R871FBX08 1 1 -R871XA005 - 1 1R87NBK001 1 1 1 1R871BA012 1 1 -R871Z0010 - 1 1R66AB0022 2 2 2 2

* Part not shown, available through FAST

12 Specifications are subject tochaagewithout notice 496 01 2100 02