CARRIER Air Conditioner/heat Pump(outside Unit) Manual L0604185

User Manual: CARRIER CARRIER Air conditioner/heat pump(outside unit) Manual CARRIER Air conditioner/heat pump(outside unit) Owner's Manual, CARRIER Air conditioner/heat pump(outside unit) installation guides

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Installation Instructions

Fig. 1 - 25HNA6 /25HNA9

A05240

NOTE: Read the entire instruction manual before starting the

installation.

Unless otherwise noted, information in these installation

instructions pertain to both 25HNA6 and 25HNA9 series units.

Information that is unique to the 25HNA6 series will be identified

as such; likewise information that is unique to the 25HNA9 series

will also be identified.

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS ....................... 2

INSTALLATION RECOMMENDATIONS ............. 2

INSTALLATION .............................. 3 - 13

Step 1 - Check Equipment & Jobsite ............... 3

Step 2 - Install on Solid Pad ...................... 3

Step 3 - Clearance Requirements .................. 3

Step 4 - Operating Ambient ...................... 3

Step 5 - Elevate Unit ........................ 3 - 4

Step 6 - Install TXV ............................ 4

Step 7 - Install Liquid Line Solenoid Valve (LSV) ..... 5

Step 8 - Make Piping Connections .............. 5 - 7

Step 9 - Make Electrical Connections ............ 7 - 8

Step 10 - Compressor Crankcase Heater ............. 8

Step 11 - Install Accessories ...................... 8

Step 12 - Make Airflow Selections .................. 8

Step 13 - Start-Up .............................. 9

Step 14 - System Functions and Sequence of

Operation ................................. 9 - 12

Step 15 - Check Charge ..................... 12 - 13

MAJOR COMPONENTS .......................... 14

TROUBLESHOOTING ........................ 14 - 17

FINAL CHECKS ................................. 19

CARE AND MAINTENANCE ...................... 19

PURON REFRIGERANT QUICK REFERENCE GUIDE 19

SAFETYCONSIDERATIONS

Improperinstallation,adjustment,alteration,service,

maintenance,orusecancauseexplosion,fire.electricalshock,or

otherconditionswhichmaycausedeath,personalinjury,or

propertydamage.Consultaqualifiedinstaller,serviceagency,or

yourdistributororbranchforinformationorassistance.The

qualifiedinstalleroragencymustusefactory-authorizedkitsor

accessorieswhenmodifyingthisproduct.Refertotheindividual

instructionspackagedwiththekitsoraccessorieswheninstalling.

Followallsafetycodes.Wearsafetyglasses,protectiveclothing,

andworkgloves.Usequenchingclothforbrazingoperations.

Havefire extinguisheravailable.Readtheseinstructions

thoroughlyandfollowallwarningsor cautionsincludedin

literatureandattachedtotheunit.Consultlocalbuildingcodes

andNationalElectricalCode(NEC)forspecialrequirements.

Recognizesafetyinformation.Thisisthesafety-alertsymbol/_

Whenyouseethissymbolontheunitandininstructionsor

manuals,bealerttothepotentialforpersonalinjury.Understand

thesesignalwords;DANGER.WARNING,andCAUTION.

Thesewordsareusedwiththesafety-alertsymbol.DANGER

identifiesthemostserioushazardswhichwillresultin severe

personalinjuryordeath.WARNINGsignifieshazardswhich

couldresultinpersonalinjuryordeath.CAUTIONisusedto

identifyunsafepracticeswhichmayresultinminorpersonal

injuryor productandpropertydamage.NOTEis usedto

highlightsuggestionswhichwillresultinenhancedinstallation,

reliability,oroperation.

ELECTRICALSHOCKHAZARD

Failuretofollowthiswarningcouldresultinpersonal

injuryordeath.

Beforeinstalling,modifying,orservicingsystem,main

electricaldisconnectswitchmustbeintheOFFposition.

Theremaybemorethan1disconnectswitch.Lockout

andtagswitchwithasuitablewarninglabel.

INSTALLATIONRECOMMENDATIONS

NOTE:Insomecasesnoiseinthelivingareahasbeentracedto

gaspulsationsfromimproperinstallationofequipment.

1.Locateunitawayfromwindows,patios,decks,etc.where

unitoperationsoundmaydisturbcustomer.

2.Ensurethatvaporandliquidtubediametersare

appropriateforunitcapacity.

3.Runrefrigeranttubesasdirectlyaspossiblebyavoiding

unnecessaryturnsandbends.

4.Leavesomeslackbetweenstructureandunittoabsorb

vibration.

5.Whenpassingrefrigeranttubesthroughthewall,seal

openingwithRTVorotherpliablesilicon-basedcaulk.

(SeeFig.2.)

6.Avoiddirecttubingcontactwithwaterpipes,ductwork,

floorjoists,wallstuds,floors,andwalls.

7.Donotsuspendrefrigeranttubingfromjoistsandstuds

witharigidwireorstrapwhichcomesindirectcontact

withtubing.(SeeFig.2.)

8.Ensurethattubinginsulationispliableandcompletely

surroundsvaportube.

9.Whennecessary,usehangerstrapswhichare1in.wide

andconformtoshapeoftubinginsulation.(SeeFig.2.)

10.Isolatehangerstrapsfrominsulationby usingmetal

sleevesbenttoconfornatoshapeofinsulation.

Whenoutdoorunitisconnectedtofactory-approvedindoorunit.

outdoorunitcontainssystemrefrigerantchargeforoperationwith

ARIratedindoorunitwhenconnectedby15ft.offield-supplied

orfactoryaccessorytubing.Forproperunitoperation,check

refrigerantchargeusingcharginginformationlocatedoncontrol

boxcoverand/orintheCheckChargesectionofthisinstruction.

IMPORTANT:Maximumliquid-linesizeis3/8-in.ODforall

residentialapplicationsincludinglonglineapplications.

IMPORTANT:Alwaysinstallthefactory-suppliedliquid-line

filterdrier.Obtainreplacementfilterdriersfromyourdistributor

orbranch.

UNITOPERATIONANDSAFETYHAZARD

Failuretofollowthiswarningcouldresultinpersonalinjury

orequipmentdamage.

Puron_refrigerantsystemsoperateathigherpressuresthan

standardR-22systems.DonotuseR-22serviceequipment

orcomponentsonPuron_refrigerantequipment.

INSTALLATION

NOTE: Avoid contact between tubing and structure

INDOOR WALL -

LIQUID TUBE

INSULATION

THROUGH THE WALL

HANGER STRAP_k _y,,,,_J OIST

(AROUND VAPOR X. k_ /_ INSULATION

_ VAPOR TUBE

h _ d

1"MIN. ------I I--,-- LIQUID TUBE

SUSPENSION

A94026

Fig. 2 - Connecting Tube Installation

Specifications for this unit in residential new construction market

require the outdoor unit, indoor unit, refrigerant tubing sets,

metering device, and filter drier listed in presale literature. There

can be no deviation. Consult the Service Manual - Air

Conditioners and Heat Pumps Using Puron(R) Refrigerant to

obtain required unit changes for specific applications and for

R-22 retrofit.

STEP 1 --Check Equipment and Job Site

Unpack Unit

Move to final location. Remove carton taking care not to damage

unit.

Inspect Equipment

File claim with shipping company prior to installation if shipment

is damaged or incomplete. Locate unit rating plate on unit corner

panel. It contains information needed to properly install unit.

Check rating plate to be sure unit matches job specifications.

STEP 2 --Install on a Solid, Level Mounting Pad

If conditions or local codes require the unit be attached to pad. tie

down bolts should be used and fastened through knockouts

provided in unit base pan. Refer to unit mounting pattern in Fig.

3 to determine base pan size and knockout hole location.

For hurricane tie downs, contact distributor for details and PE

Certification (Professional Engineer), if required.

On rooftop applications, mount on level platform or frame. Place

unit above a load-bearing wall and isolate unit and tubing set

from structure. Arrange supporting members to adequately

support unit and minimize transmission of vibration to building.

Consult local codes governing rooftop applications.

Roof mounted units exposed to winds above 5 mph may require

wind baffles. Consult the Service Manual - Residential Split

System Air Conditioners and Heat Pumps Using Puron(R)

Refrigerant for wind baffle construction.

VIEW FROM TOP

UNIT BASE PAN

DIMENSIONS

36 1/2 x 40

29 1/2 X 33

TIEDOWN KNOCKOUT LOCATIONS m

A B C

11 5/8 6 13/16 28 3/4

10 1/16 5 5/8 23 3/4

A05242

Fig. 3 - Tiedown Knockout Locations

NOTE: Unit nmst be level to within _+2° (_+3/8 in./ft.) per

compressor manufacturer specifications.

STEP 3--Clearance Requirements

When installing, allow sufficient space for airflow clearance.

wiring, refrigerant piping, and service. Allow 30-in. clearance to

service end of unit and 48 in. above unit. For proper airflow, a

6-in. clearance on 1 skle of unit and 12 in. on all remaining sides

must be maintained. Maintain adistance of 24 in. between units.

Position so water, snow. or ice from roof or eaves cannot fall

directly on unit.

On rooftop applications, locate unit at least 6 in. above roof

surface.

STEP 4 --Operating Ambient

The minimum outdoor operating ambient in cooling mode is

55°F without low ambient cooling enabled and the maximum

outdoor operating ambient in cooling mode is 125°F. On

Infinity " communicating systems only (for both 25HNA6 and

25HNA9), low ambient cooling is available to 0°F.

The maximum outdoor operating ambient in heating mode is

66°F on all models. Continuous operation in the heating mode is

approved to -30°F.

STEP 5--Elevate Unit

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Do not allow water and/or ice to build up in base pan.

Elevate unit per local climate and code requirements to provide

clearance above estimated snowfall level and ensure adequate

drainage of unit.

UNITOPERATIONHAZARD

Failuretofollowthiscautionmayresultinequipment

damageorimproperoperation.

Locatetheunitinsuchawaythatit isstableinall

circumstancesincludingadverseweatherconditions.

STEP6--InstallTXV

NOTE:Appliestonon-TXVindoorunitsonly.If installinga

ratedandapprovedindoorcoilwithouta factoryinstalled

Puron(_TXV,removeandreplacethefixedorificeorR-22TXV

expansiondevicewithahardshutoffPuronTXV.

Thethermostaticexpansionvalveisspecificallydesignedto

operatewithPuron(a)refrigerant.DonotuseanR-22TXV.An

existingR-22TXVmustbereplacedwithafactory-approved

TXVspecificallydesignedfor Puronrefrigerant.Referto

ProductDataDigestfortheappropriateTXVkitnumber.

UNITOPERATIONHAZARD

Failuretofollowthiscautionmayresultinequipment

damageorimproperoperation.

Allindoorcoilunitsmustbeinstalledwithahardshut

offPuron®TXVmeteringdevice.

IMPORTANT: The TXV should be mounted as close to the

indoor coil as possible and in a vertical, upright position. Avoid

mounting the inlet tube vertically down. Valve is more

susceptible to malfunction due to debris if inlet tube is facing

down. A factory-approved filter drier must be installed in the

liquid line.

Installing TXV in Place of Piston

1. Pump system down to 2 psig and recover refrigerant.

2. Remove hex nut from piston body. Use backup wrench on

fan coils.

3. Remove and discard factory-installed piston. Be sure

Teflon seal is in place.

4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.

NOTE: If the piston is not removed from the body, TXV will

not function properly.

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Use a brazing shield and wrap TXV with wet cloth or

use heat sink material.

5. Install TXV on indoor coil liquid line. Sweat swivel

adapter to inlet of indoor coil and attach to TXV outlet.

Use backup wrench to avoid damage to tubing or valve.

Sweat inlet of TXV. marked "IN" to liquid line. Avoid

excessive heat which could damage valve.

6. Install vapor elbow with equalizer adapter to suction tube

of line set and suction connection to indoor coil. Adapter

has a 1/4-in. male connector for attaching equalizer tube.

7. Connect equalizer tube of TXV to 1/4-in. equalizer fitting

on vapor line adapter.

8. Attach TXV bulb to horizontal section of suction line

using clamps provided. Insulate bulb with field-supplied

insulation tape. See Fig. 4 for correct positioning of

sensing bulb.

9. Proceed with remainder of unit installation.

_.10 O'CLOCK

2 O'CLOCK]

L_'SUCTION TUBE

8 O'CLOCK

SENSING

4 O'CLOCK

7/8 IN. OD & SMALLER LARGER THAN 7/8 IN. OD

A81032

Fig. 4 - Position of Sensing Bulb

Replacing TXV on R-22 Indoor Coil

1. Pump system down to 2 psig and recover refrigerant.

2. Remove coil access panel and fitting panel from front of

cabinet.

3. Remove TXV support clamp using a 5/16-in. nut driver.

Save the clamp.

4. Remove R-22 TXV using a backup wrench on flare

connections to prevent damage to tubing.

5. Using wire cutters, cut equalizer tube off flush with vapor

tube inside cabinet.

6. Remove bulb from vapor tube inside cabinet.

7. Braze equalizer stub-tube closed. Use protective barrier as

necessary to prevent damage to drain pan.

IMPORTANT: Route the equalizer tube of Puron TXV through

suction line connection opening in fitting panel prior to replacing

fitting panel around tubing.

8. Install TXV with 3/8-in. copper tubing through small hole

in service panel. Use wrench and backup wrench, to avoid

damage to tubing or valve, to attach TXV to distributor.

9. Reinstall TXV support clamp (removed in item 3).

10. Attach TXV bulb to vapor tube inside cabinet, in same

location as original was when removed, using supplied

copper bulb clamps. See Fig. 4 for correct positioning of

sensing bulb.

11. Route equalizer tube through suction connection opening

(large hole) in fitting panel and install fitting panel in

place.

12. Sweat inlet of TXV. marked "IN" to liquid line. Avoid

excessive heat which could damage valve.

13. Install vapor elbow with equalizer adapter to vapor line of

line set and vapor connection to indoor coil. Adapter has

a 1/4-in. male connector for attaching equalizer tube.

14. Connect equalizer tube of TXV to 1/4-in. equalizer fitting

on vapor line adapter. Use backup wrench to prevent

damage to equalizer fitting.

15. Proceed with remainder of unit installation.

STEP 7 --In Long-Line Applications, Install Liquid-Line

Solenoid Valve (LSV)

For refrigerant piping arrangements with equivalent lengths

greater than 80 ft. and/or when elevation difference between

indoor and outdoor unit is greater than _+20 ft.. follow all

requirements of the Long-Line Guideline--Air Conditioners and

Heat Pumps Using Puron® refrigerant. If required by

Long-Line Guideline. install LSV kit, part no. KHALS0401LLS,

specifically designed for Puron® refrigerant heat pumps. LSV

should be installed within 2 ft. of outdoor unit with flow arrow

pointing toward outdoor unit. Follow the Installation Instructions

included with accessory kit.

IMPORTANT: Flow arrow must point toward outdoor unit.

STEP 8 --Make Piping Connections

PERSONAL INJURY AND UNIT DAMAGE

HAZARD

Failure to follow this warning could result in personal

injury or death.

Relieve pressure and recover all refrigerant before

system repair or final unit disposal. Use all service

ports and open all flow-control devices, including

solenoid valves.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Do not leave system open to atmosphere any longer than

minimum required for installation. POE oil in compressor is

extremely susceptible to moisture absorption. Always keep

ends of tubing sealed during installation.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipnmnt

damage or improper operation.

If ANY refrigerant tubing is buried, provide a 6 in. vertical

rise at service valve. Refrigerant tubing lengths up to 36 in.

may be buried without further special consideration. Do

not bury lines longer than 36 in.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Observe the following:

•Use a brazing shield.

• Wrap service valves with wet cloth or use a heat sink

material.

Outdoor units may be connected to indoor section using

accessory tubing package or field-supplied refrigerant grade

tubing of correct size and condition. For tubing requirements

beyond 80 ft., substantial capacity and performance losses can

occur. Following the recommendations in the Application

Guideline and Service Manual-Residential Split-System Air

Conditioners and Heat Pumps Using Puron® Refrigerant will

reduce these losses. Refer to Table 1 for field tubing diameters.

Refer to Table 2 for accessory requirements.

Outdoor Unit Connected to Factolw-Approved Indoor Unit:

Outdoor unit contains correct system refrigerant charge for

operation with factory approved ARI rated indoor unit with

highest sales volume when connected by 15 ft. of field-supplied

or factory-accessory tubing, and factory supplied filter drier.

Check refrigerant charge for maximum efficiency.

Table 1--Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)

Information is Specific to 25HNA6 and 25HNA9 Models

UNIT SIZE

25HNA624

25HNA636

25HNA648

25HNA660

Connection

Diameter

3/8

LIQUID

Tube

Diameter

3/8

R&TED VAPOR

(up to 80 ft. T.E.L)

Connection

Diameter

5/8

3/4

7/8

Tube

Diameter

5/8

3/4

7/8

1 1/8

25HNA924 3/8 3/8 3/4 3/4

25HNA936 3/8 3/8 3/4 7/8

25HNA948 3/8 3/8 7/8 7/8

25HNA960 3/8 3/8 7/8 1 1/8

Notes:

t. Tube diameters are for total equivalent lengths (TE.L.) up to 80 ft. Consult the Long Line Guideline Air Conditioners and Heat Pumps using Puron@

,., refrigerant.

2. Do not apply capillary tube or the fixed orifice indoor coils to these units.

3. T.E.L. - Total Equivalent Length

Table 2--Accessory Usage

REQUIRED FOR LOW-AMBI- REQUIRED FOR LONG LINE REQUIRED FOR SEA

Accessory ENT APPLICATIONS APPLICATIONS* COAST APPLICATIONS

(Below 55 °F) (Over 80 ft.) (Within 2 miles)

Crankcase Heater Standard Standard Standard

Standard with Infinity Control

Evaporator Freeze Protection (Low Ambient not allowed with non- No No

communicating thermostat)

Standard with infinity Control

Winter Start Control (LowAmbient not allowed with non- No No

communicating thermostat)

Standard on 25HNA6 models. Standard on 25HNA6 modets. Standard on 25HNA6

modets.

Compressor Start Assist Capacitor Not required on 25HNA9 models Not required on 25HNA9 modets Not required on 25HNA9

and Relays since compressor always starts since compressor always starts models since compressor

unloaded, unloaded, always starts unloaded.

Standard with Infinity Control (Low

Low-Ambient Control ambient not allowed with non-commu- No No

nicating thermostat)

Support Feet Recommended No Recommended

Liquid Line Solenoid Valve No Yes No

Ball Bearing Fan Motor Standard Standard Standard

Puron Balance Port Hard Shut-Off

TXV Yes1- Yes1- Yest

For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (Total Equivalent Length), refer to the Long Line Guideline Air Condition-

ers and Heat Pumps using Puron(_) refrigerant.

tRequired on all indoor units. Standard on all new Puron refrigerant fan coils and furnace coils.

$ Information isspecific to 25HNA6 and 25HNA9 models.

Install Liquid-Line Filter Drier Indoor

Refer to Fig. 5 and install filter drier as follows:

1. Braze 5-in. liquid tube to the indoor coil.

2. Wrap filter drier with damp cloth.

3. BrazefilterdriertoabaveS-in. liquid tube.Flowarrowmust

point towards indoor coil.

4. Connect and braze liquid refrigerant tube to the filter drier.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage

or improper operation.

Installation of filter drier in liquid line is required.

Refrigerant Tubing connection Outdoor

Connect vapor tube to fitting on outdoor unit vapor service

valves (see Table 1).

Install Adapter Tube

1. Remove plastic retainer holding outdoor piston in liquid

service valve.

2. Check outdoor piston size with matching number listed on

unit rating plate.

3. Locate plastic bag taped to unit containing adapter tube.

4. 4. Remove Teflon_R3 washer from bag and install on

open end of liquid service wdve.

5. Remove adapter tube from bag and connect threaded nut

to liquid service valve. Tighten nut finger tight and then

with wrench tighten an additional 1/2 turn (15 ft-lb).

DO NOT OVERTIGHTEN!

Sweat Connections

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Service valves must be wrapped in a heat-sink

material such as a wet cloth.

Fig. 5 - Liquid Line Filter Drier

A05227

Use refrigerant grade tubing. Service valves are closed from

factory and ready for brazing. After wrapping service valve with

a wet cloth, braze sweat connections using industry accepted

methods and materials. Consult local code requirements.

Refrigerant tubing and indoor coil are now ready for leak testing.

This check should include all field and factory joints.

Evacuate Refrigerant Tubing and Indoor Coil

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the

recommended deep vacuum method of 500 microns. The

alternate triple evacuation method may be used if the procedure

outlined below is followed. Always break a vacuum with dry

nitrogen.

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of

pulling a vacuum of 500 microns and a vacuum gage capable of

accurately measuring this vacuum depth. The deep vacuum

method is the most positive way of assuring a system is free of air

and liquid water. (See Fig. 6)

5000

4500

4000

_3500

g3000

_2500

2000

1500-

1000

500

LEAKIN

SYSTEM

VACUUM TIGH'T

TOO WET

TIGHT

DRY SYSTEM

12345 6

MINUTES

Fig, 6- Deep Vacuum Graph

A95424

Triple Evacuation Method

The triple evacuation method should only be used when vacuum

pump is only capable of pumping down to 28 in. of mercury

vacuum and system does not contain any liquid water. Refer to

Fig. 7 and proceed as follows:

1. Pump system down to 28 in. of mercury and allow pump

to continue operating for an additional 15 minutes.

2. Close service valves and shut off vacuum pump.

3. Connect a nitrogen cylinder and regulator to system and

open until system pressure is 2 psig.

4. Close service valve and allow system to stand for 1 hr.

During this time, dry nitrogen will be able to diffuse

throughout the system absorbing moisture.

5. Repeat this procedure as indicated in Fig. 7. System will

then be free of any contaminants and water vapor.

I EVACUATE I

[BREAK VACUUM WITH DRY NITROGEN

[EVACUATE I

[BREAK VACUUM WITH DRY NITROGEN

[EVACUATE]

CHECK FOR TIGHT, DRY SYSTEM

(IF IT HOLDS DEEP VACUUM)

I CHARGE SYSTEM I

A95425

Fig. 7 - Triple Evacuation Method

Final Tubing Check

IMPORTANT: Check to be certain factory tubing on both

indoor and outdoor unit has not shifted during shipment. Ensure

tubes are not rubbing against each other or any sheet metal. Pay

close attention to feeder tubes, making sure wire ties on feeder

tubes are secure and tight.

STEP 9 --Make Electrical Connections

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Do not supply power to unit with compressor terminal

box cover removed.

Be sure field wiring complies with local and national fire, safety,

and electrical codes, and voltage to system is within limits shown

on unit rating plate. Contact local power company for correction

of improper voltage. See unit rating plate for recommended

circuit protection device.

NOTE: Operation of unit on improper line voltage constitutes

abuse and could affect unit reliability. See unit rating plate. Do

not install unit in system where voltage may fluctuate above or

below permissible limits.

NOTE: Use copper wire only between disconnect switch and

unit.

NOTE: Install branch circuit disconnect of adequate size per

NEC to handle unit starting current. Locate disconnect within

sight from and readily accessible from unit, per Section 440-14

of NEC.

Route Ground and Power Wires

Remove access panel to gain access to unit wiring. Extend wires

from disconnect through power wiring hole provided and into

unit control box.

ELECTRICALSHOCKHAZARD

Failureto followthiswarningcouldresultin personal

injuryordeath.

Theunitcabinetmusthaveanuninterruptedorunbroken

groundtominimizepersonalinjuryif anelectricalfault

shouldoccur.Thegroundmayconsistofelectricalwireor

metalconduitwheninstalledinaccordancewithexisting

electricalcodes.

ConnectGround and Power Wiles

Connect ground wire to ground connection in control box for

safety. Connect power wiring to contactor as shown in Fig. 8.

DISCONNECT

PER N. E. C. AND/OR

LOCAL CODES

FIELD POWER

WIRING

FIELD GROUND

WIRING

CONTACTOR

GROUND

LUG

A91056

Fig. 8 - Line Power Connections

Connect Control Wiring

Route low voltage control wires through control wiring grommet

and connect leads to control board.

For 25HNA9 models, connect to Infinity connections ABCD

only. Standard non-communicating thermostats are not allowed

unless it is an emergency that User Interface is not working

properly and new User Interface is not available. For emergency

use, connect to standard thermostat connections R, C, W. Y1. Y2,

and O.

NOTE: When unit is operating in enmrgency mode, STATUS

light will flash rapidly. Unit will operate in high stage ONLY.

For 25HNA6 models, connect to ABCD for Infinity Control or

standard thermostat connections R. C, Wl, Y1. Y2. and O.

General Information

Use No. 18 AWG color-coded, insulated (35°C minimum) wire

for all installations.

All wiring must be NEC Class 1 and must be separated from

incoming power leads.

Use furnace transformer, fan coil transformer, or accessory

transformer for control power, 24v/40va minimum. The outdoor

unit requires a minimum of 27va/24vac control power.

Final Wiring Check

IMPORTANT: Check factory wiring and field wire connections

to ensure terminations are secured properly. Check wire routing

to ensure wires are not in contact with tubing, sheet metal, etc.

STEP 10 --Compressor Crankcase Heater

Furnish power to crankcase heater a minimum of 24 hr before

starting unit. To furnish power to heater only, set thermostat to

OFF and close electrical disconnect to outdoor unit.

NOTE: On 25HNA6 models, starting the compressor without a

minimum of 12 hours of crankcase heat prior to initial start-up

may result in a compressor chattering noise and possible damage

to the compressor.

STEP 11 --Install Accessories

Refer to the individual instructions packaged with kits or

accessories when installing.

STEP 12 --Make Airflow Selections for 25HNA6 Series

Only Using Non-Communicating (Non-Infinity) Thermo-

stats

Airflow Selection for 58CVA/58MVB Furnaces

The 58CVA/58MVB variable speed furnaces provide high-and

low-stage blower operation to match the capacities of the

compressor at high and low stages. To select the recommended

airflow and for adjustments to the manual switches labeled

SWl-5. AC, and CF on the control board refer to the furnace

Installation. Start-UR and Operating Instructions. The

58CVA/58MVB utilizes a control center that allows the installing

technician to select the proper airflows. The HP switch

determines the airflow during high stage compressor operation.

Airflow for high- and low-stage can be calculated at either 350

CFM per ton or 400 CFM per ton, based on the positions of

SWl-5.

When using communicating (Infinity) control, dipswitch

adjustments are not necessary on furnaces. Airflows are

determined by Infinity Control setup.

Airflow Selection for FK4 or FV4 Fan Coils for 25HNA6

Series Only Using Non-Communicating (Non-Infinity)

Thermostats

The FV4 provides high- and low-stage blower operation to

match the capacities of compressor at high- and low-stage. To

select recommended airflow, refer to FV4 Installation

Instructions. The FV4 utilizes an Easy Select control board that

allows the installing technician to select proper airflows. For

adjustments to control board, select appropriate HP SIZE and

CFM ADJUST setting. This fan coil has an adjustable blower off

delay factory set at 90 sec for high- and low-stage blower

operation.

For other combinations of equipment Consult Product Data

Digest.

STEP 13 --Start-Up

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in minor personal

injury, equipment damage or improper operation.

Observe the following:

• Do not overcharge system with refrigerant.

• Do not operate unit in a vacuum or at negative pressure.

• Do not disable low pressure switch

• Dome temperatures may be hot.

PERSONAL INJURY HAZARD

Failure to follow this caution may result in personal injury.

Wear safety glasses, protective clothing, and gloves when

handling refrigerant.

ENVIRONMENTAL HAZARD

Failure to follow this caution may result in environmental

damage.

Federal regulations require that you do not vent

refrigerant to the atmosphere. Recover during system

repair or final unit disposal.

Follow these steps to propedv start up the system:

1. After system is evacuated, fully back seat (open) liquid

and vapor service valves.

2. Unit is shipped with valve stem(s) front seated (closed)

and caps installed. Replace stem caps after system is

opened to refrigerant flow (back seated). Replace caps

finger-tight and tighten with wrench an additional 1/12

turn.

3. Close electrical disconnects to energize system.

4. Set room thermostat or User Interface at desired

temperature. Be sure set point is below indoor ambient

temperature and is set low enough to energize desired

stage.

5. Set room thermostat or User Interface to COOL and fan

control to ON or AUTO mode, as desired. Operate unit for

15 minutes. Check system refrigerant charge.

NOTE: For 25HNA6 Series only using non-communicating

(non-Infinity) thermostat. Carrier electronic thermostats are

equipped with a 15-minute staging timer. This timer prevents the

two-stage system from operating at high stage until unit has been

operating in low stage for 15 minutes, unless there is at least a 5°F

difference between room temperature and thermostat set point. To

force high stage (after a minimum of 2 minutes in low stage),

adjust the set point at least 5°F below room ambient.

6. Set room thermostat or User Interface to HEAT or COOL

and fan control to AUTO or ON, as desired. Wait for

appropriate time delay(s). Operate unit for 15 minutes.

Check refrigerant charge.

STEP 14 --SYSTEM FUNCTIONS AND SEQUENCE OF

OPERATION

The outdoor unit control system has special functions. The

following is an overview of the two-stage control functions:

Cooling and Heating Operation

The 25HNA6 model utilizes either a standard indoor thermostat

or Infinity Communication User Interface. The 25HNA9 models

utilize an Infinity communicating User Interface only. With a call

for first stage cooling, the outdoor fan, reversing valve, and low

stage compressor are energized. If low-stage cannot satisfy

cooling demand, high-stage cooling is energized by the second

stage of indoor thermostat or User Interface. After second stage is

satisfied, the unit returns to low-stage operation until first stage is

satisfied or until second stage is required again. When both first

stage and second stage cooling are satisfied, the compressor will

shut off. The reversing valve will remain energized until the

control board power is removed or a call for heating in initiated.

With a call for heating, the outdoor fan and compressor are

energized. The compressor will operate in high or low stage

operation, as needed to meet the heating demand. When the

heating demand is satisfied, the compressor and fan will shut off.

The reversing valve is de-energized in the heating mode.

NOTE: When two-stage unit is operating at low-stage, system

vapor (suction) pressure will be higher than a standard

single-stage system or high-stage operation.

NOTE: Outdoor fan motor will continue to operate for one

minute after compressor shuts off. when outdoor ambient is

greater than or equal to 100°F.

NOTE: On 25HNA6 models, if unit has not operated within the

past 12 hours, or following a unit power-up, upon the next

thermostat high- or low-stage demand, unit operates for a

minimum of 5 minutes in high-stage.

On 25HNA6 models with non-communicating (non-Infinity)

systems, with first stage of cooling, Y1 and O are powered on;

and with second stage of cooling, Y1, Y2, and O are on. For

these systems, with first stage of heating Y1 is on and for second

stage of heating, Y1 and Y2 are on. When the reversing valve is

energized, O is powered on.

Communication and Status Function Lights

For Infinity Control only, Green communications (COMM)

Light

A green LED (COMM light) on the outdoor board (see Fig. 9)

indicates successful communication with the other system

products. The green LED will remain OFF until communications

is established. Once a valid command is received, the green LED

will turn ON continuously. If not communication is received

within 2 minutes, the LED will be turned OFF until the next valid

communication.

Amber Status Light

An amber colored STATUS light is used to display the operation

mode and fault codes as specified in the troubleshooting section.

See Table 5 for codes and definitions.

NOTE: Only one code will be displayed on the outdoor unit

control board (the most recent, with the highest priority).

Utility Interface

With Infinity Control

The utility curtailment relay should be wired between R and Y2

connections on the control board for Infinity Communicating

Systems only (see Fig. 9.) This input allows a power utility

device to interrupt compressor operation during peak load

periods. When the utility sends a signal to shut the system down,

the User Interface will display, "Curtailment Active".

One Minute Stage Change Time Delay on 25HNA6 Models

When compressor changes stages from high to low or low to

high, there is a 1-minute time delay before compressor restarts.

The outdoor fan motor remains running.

('ompressor Operation on 25HNA6 Models

When the compressor operates in high stage operation, the

compressor motor rotates clockwise. Both the lower and upper

pistons are eccentric with the rotating crankshaft and both

compress refrigerant.

When the compressor operates in low stage operation, the

compressor motor reverses direction (rotates counterclockwise).

The lower piston becomes idle and the upper piston compresses

refrigerant. The start and run windings ale reversed.

Crankcase Heater Operation

The crankcase heater is energized during unit off cycle regardless

of outside air temperature (OAT) on 25HNA6 models.

The crankcase heater is energized during off cycle below 65°F on

25HNA9 models.

Outdoor Fan Motor Operation

The outdoor unit control energizes outdoor fan any time

compressor is operating, except for defrost. The ouMoor fan

remains energized if a pressure switch or compressor overload

should open. Outdoor fan motor will continue to operate for one

minute after the compressor shuts off when the outdoor ambient

is greater than or equal to 100°F. On 25HNA6 models, the

outdoor fan remains energized during the 1-minute compressor

staging time delay.

Time Delays

The unit time delays include:

• Five minute time delay to start cooling or heating

operation when there is a call from the thermostat or

user interface. To bypass this feature, momentarily

short and release Forced Defrost pins.

• Five minute compressor re-cycle delay on return from

a brown-out condition.

• Two minute time delay to return to standby operation

from last valid conmmnication (with Infinity only).

• One minute time delay of outdoor fan at termination of

cooling mode when outdoor ambient is greater than or

equal to 100°F.

• Fifteen second delay at termination of defrost before

the auxiliary heat (Wl) is de-energized.

• Twenty second delay at termination of defrost before

the outdoor fan is energized.

• Thirty second compressor delay when quiet shift

enabled.

• On 25HNA6 models there is a 1 minute time delay

between staging from low to high and from high to low

capacity. On 25HNA9 models there is no delay; the

compressor will change from low to high and from

high to low capacity on the fly to meet the demand.

Compressor Operation on 25HNA9 Models:

When the compressor is operating in low stage, the modulating

ring is de-activated, allowing two internal bypass ports to close

off 33% of the scroll compression area, so the system operates at

part load capacity. The 24volt solenoid coil is de-energized in

low stage operation.

When the compressor is operating in high stage, the modulating

ring is activated, sealing the bypass ports, which allows the

compressor to operate at full load capacity. The 24volt solenoid

coil is energized in high stage operation. The 25HNA9 unit

contains a 230v to 24vac transformer to supply power to the

solenoid when it is energized. The compressor solenoid load

should not be included in the system (furnace or fan coil) control

power transformer sizing.

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GENERAL INFORMATION

Low Ambient Cooling

When this unit is operating below 55°F outdoor temperature.

provisions must be made for low ambient operation.

Infinity Controned low ambient cooling:

This unit is capable of low ambient cooling without a kit ONLY

when using Infinity control. A low ambient kit is not required,

and the outdoor fan motor does not need to be replaced for

Infinity controlled low ambient operation. The Infinity Control

provides an automatic evaporator coil freeze protection algorithm

that eliminates the the need for an evaporator freeze thermostat.

Low ambient cooling must be enabled in the User Interface set

up. Fan may not begin to cycle until about 40°F OAT. Fan will

cycle based on coil and outdoor air temperature.

Infinity cnntrolled low ambient mode operates as follows:

• Fan is OFF when outdoor coil temp is < (outdoor air

temperature + 3 °F) or outdoor fan has been ON for 30

minutes. (Fan is turned off to allow refrigerant system to

stabilize.)

• Fan is ON when outdoor coil temp > (outdoor air

temperature + 25°F) or outdoor coil temp > 80°F or if

outdoor fan has been OFF for 30 minutes. (Fan is turned

on to allow refrigerant system to stabilize.)

• Low pressure switch is ignored for first 3 minutes during

low ambient start up. After 3 minutes, ifLPS trips, then

outdoor fan motor is turned off for 10 minutes, with the

compressor running. If LPS closes within 10 minutes

then cooling continues with the outdoor fan cycling per

the coil temperature routine listed above for the remainder

of the cooling cycle. If the LPS does not close within 10

minutes, then the normal LPS trip response (shut down

cooling operation and generate LPS trip error) will occur.

Defrost

This control offers 5 possible defrost interval times: 30. 60, 90,

120 minutes, or AUTO.

On 25HNA6 models, these are selected by dip switches on the

unit control board or by the Infinity Control User Interface. The

Infinity Control selection overrides the control board dip switch

settings.

On 25HNA9 , the defrost interval times: 30, 60, 90, and 120 -

minutes or AUTO are selected by the Infinity Control User

Interface (the dip switches are not used.)

AUTO defrost adjusts the defrost interval time based on the last

defrost time as follows:

• When defrost time <3 minutes, the next defrost

interval= 120 minutes.

• When defrost time 3-5 minutes, the next defrost

interval=90 minutes.

• When defrost time 5-7 minutes, the next defrost

interval=60 minutes.

• When defrost time >7 minutes, the next defrost

interval=30 minutes.

The control board accumulates compressor run time. As the

accumulated run time approaches the selected defrost interval

time, the control board monitors the coil temperature sensor for a

defrost demand. If a defrost demand exists, a defrost cycle will be

initiated at the end of the selected time interval. A defrost demand

exists when the coil temperature is at or below 32°F for 4

minutes during the interval.

The defrost cycle is terminated when the coil temperature reaches

65°F or 10 minutes has passed.

If the coil temperature does not reach 32°F within the interval,

the interval timer will be reset and start over.

• Upon initial power up the first defrost interval is

defaulted to 30 minutes. Remaining intervals are at

selected times.

• Defrost is only allowed to occur below 50°F outdoor

ambient temperature.

Defrost Hold

On 25HNA6 models, in a non-comnaunicating system, if the

thermostat becomes satisfied (Y1 or Y1 and Y2) before the

defrost cycle is terminated, the control will "Hold" in defrost

mode and finish the defrost cycle on the next call for heat.

On 25HNA6 models, with communicating Infinity Control and

all 25HNA9 models, defrost hold is not needed in a

communicating system because the User Interface will complete

the defrost cycle before shutting down the system.

Forced Defrost

On 25HNA6 models with non-communicating (non-Infinity)

control, forced defrost can be initiated by manually shorting the

2-pin header labeled FORCED DEFROST (see Fig 9) on the

control board for 5 seconds then releasing.

On 25HNA6 and 25HNA9 with communicating (Infinity)

control, forced defrost is initiated with the User Interface.

On all models, during a Forced Defrost:

• If coil temperature is at defrost temperature of 32°K

and outdoor air temperature is below 50°K a full

defrost sequence will occur.

• If coil temperature or outdoor air temperature do not

meet the above requirements, an abbreviated 30 second

defrost will occur.

Quiet Shift

Quiet Shift is a field selectable defrost mode which may eliminate

occasional noise that could be heard at the start of the defrost

cycle and restarting of the heating cycle. On 25HNA6 models

with non-communicating system, this feature must be enabled by

selecting the 3rd position of the 3-position dip switch. For

25HNA6 and 25HNA9 models with communicating (Infinity)

systems, it must be enabled at the User Interface. When activated,

the following sequence of operation will occur. Reversing valve

will energize and compressor will turn off for 30 seconds, then

turn back on to complete defrost. At the end of the defrost cycle.

the reversing valve de-energizes, compressor will turn off for

another 30 seconds, and the fan will turn off for 40 seconds,

before starting in the heating mode.

Liquid Line Solenoid Accessory

In heat pump long-line applications, a liquid line solenoid is

required to control refrigerant migration in the heating mode. The

solenoid should be installed near the outdoor unit with the arrow

facing the outdoor unit. This is the direction of flow control. See

application manual for long-line application details.

Accesso D, Liquid Solenoid with Infinity Communicating

Control: When using the Infinity control, the liquid line

solenoid output is provided at the Y1 connection. Connect the

solenoid as shown in the wiring label diagram. This is a 24vac

output that is energized whenever the compressor is energized. It

closes, in the compressor off mode. to prevent refrigerant

migration into the unit through the liquid line.

On 25HNA6 Models with Accessory Liquid Solenoid Using a

Non-Communicating Thermostat: The liquid solenoid is

connect to the Y1 and C terminal connections. The liquid

solenoid closes, in the compressor off mode. to prevent

refrigerant migration into the unit through the liquid line.

STEP 15 --Check Charge

Unit Charge

Factory charge and charging method are shown on unit

information plate. Charge Puron refrigerant units with cylinder in

inverted position and a commercial-type metering device in

manifold hose. Charge refrigerant into suction line.

NOTE: If subcooling charging conditions are not favorable.

charge must be weighed in accordance with unit rating plate,

_+0.6 oz./ft, of 3/8-in. liquid line above or below 15 ft..

respectively. Favorable conditions fall within the ranges given on

the charging chart on the outdoor unit plate.

EXAMPLE:

To calculate additional charge required for a25-ft. line set:

25 ft. -15 ft. =10 ft. X0.6 oz./ft. =6 oz. of additional charge.

Cooling Only Procedure

This system requires charging by the subcooling method.

1. On all unites, operate unit aminimum of 10 minutes in

high stage before checking charge.

On 25HNA6 models, charging in low stage may cause

compressor chattering and possible damage to the

compressor.

2. Measure liquid service valve pressure by attaching an

accurate gage to service port.

3. Measure liquid line temperature by attaching an accurate

thermistor type or electronic thermometer to liquid line

near outdoor coil.

4. Refer to unit rating plate for required subcooling

temperature. Subcooling amount is for high stage

operation.

5. Refer to Table 3. Find the point where required subcooling

temperature intersects measured liquid service valve

pressure.

6. To obtain required subcooling temperature at a specific

liquid line pressure, add refrigerant if liquid line

temperature is higher than indicated or reclaim refrigerant

if temperature is lower. Allow a tolerance of _+3°F.

Heating Check Chart Procedure

To check system operation during heating cycle, refer to the Heat

Pump Charging Instructions label on outdoor unit. This chart

indicates whether a correct relationship exists between system

operating pressure and air temperature entering indoor and

outdoor units. If pressure and temperature do not match on chart,

system refrigerant charge may not be correct. Do not use chart to

adjust refrigerant charge.

NOTE: In heating mode, check refrigerant charge only when

pressures are stable. If in doubt, remove charge and weigh in

correct refrigerant charge.

NOTE: When charging is necessary during heating season,

charge must be weighed in accordance with unit rating plate,

_+0.6 oz./ft, of 3/8-in. liquid line above or below 15 ft.,

respectively.

EXAMPLE:

To calculate additional charge required for a 25-ft. line set:

25 ft. - 15 ft. = 10 ft. X 0.6 oz./ft. = 6 oz. of additional charge.

Table 3--Required LiquidlLine Temperature (°F)

LiQUiD PRESSURE REQUIRED SUBCOOLING TEMPERATURE (°F)

AT SERVICE VALVE

(PSIG) 810 12 14 16 18

189 58 56 54 52 50 48

195 60 58 56 54 52 50

202 62 60 58 56 54 52

208 64 62 60 58 56 54

215 66 64 62 60 58 56

222 68 66 64 62 60 58

229 70 68 66 64 62 60

236 72 70 68 66 64 62

243 74 72 70 68 66 64

251 76 74 72 70 68 66

259 78 76 74 72 70 68

266 80 78 76 74 72 70

274 82 80 78 76 74 72

283 84 82 80 78 76 74

291 86 84 82 80 78 76

299 88 86 84 82 80 78

308 90 88 86 84 82 80

317 92 90 88 86 84 82

326 94 92 90 88 86 84

335 96 94 92 90 88 86

345 98 96 94 92 90 88

354 100 98 96 94 92 90

364 102 100 98 96 94 92

374 104 102 100 98 96 94

384 106 104 102 100 98 96

395 108 106 104 102 100 98

406 110 108 106 104 102 100

416 112 110 108 106 104 102

427 114 112 110 108 106 104

439 116 114 112 110 108 106

450 118 116 114 112 110 108

462 120 118 116 114 112 110

474 122 120 118 116 114 112

486 124 122 120 118 116 114

499 126 124 122 120 118 116

511 128 126 124 122 120 118

MAJOR COMPONENTS

2-Stage Control Board

The HP control board controls the following functions:

• High and low stage compressor contactor operation

• Outdoor fan motor operation

• Reversing valve operation

• Defrost operation

• Low ambient cooling

• Crankcase heater operation

• Compressor external protection

• Pressure switch monitoring

• Time Delays

• On 25HNA6 models, high and low stage start relay and

capacitor operation (Bristol only)

Field Connections

On 25HNA6 models with non-communicating (non-Infinity)

System, the two-stage control receives 24vac low-voltage

control system inputs through the R, C, Y1, Y2 and O

connections located at the bottom of the control board (see Fig.

9.) On a non-communicating system, output W1 is connected at

the bottom of the control board for auxiliary heat.

On 25HNA6 models with communicating system and all

25HNA9 models, use the ABCD Infinity Connections.

Two Stage Compressor

The two stage compressor contains motor windings that provide

2-pole (3500 RPM) operation. Refer to Table 4 for correct

winding resistance.

Compressor Internal Relief

The compressor is protected by an internal pressure relief (IPR)

which relieves discharge gas into the compressor shell when

differential between suction and discharge pressure exceeds

500-550 psi on 25HNA6 models and 550-625 psi on 25HNA9

models. The compressor is also protected by an internal overload

attached to motor windings.

Compressor Control Contactors

The contactor(s) have a 24volt coil. The electronic control board

controls the operation of the appropriate contactor.

TROUBLESHOOTING

Systems Communication Failure

If communication with the Infinity control is lost with the User

Interface, the control will flash the appropriate fault code. (See

Table 5.) Check the wiring to the UI and the indoor and outdoor

units.

Model Plug

The control board must have a valid model plug to operate. If a

valid model plug is not detected, it will not operate and the

control will flash the appropriate fault code, shown in Table 5.

Pressure Switch Protection

The outdoor unit is equipped with high- and low-pressure

switches. If the control senses the opening of ahigh or low

pressure switch, it will respond as follows:

1. De-energize the appropriate compressor contactor

2. Keep the outdoor fan operating for 15 minutes

3. Display the appropriate fault code (see Table 5)

4. After a 15 minute delay, if there is a call for cooling or

heating and LPS or HPS is reset, the appropriate

compressor contactor is energized.

5. If LPS or HPS has not closed after a 15 minute delay, the

outdoor fan is turned off. If the open switch closes anytime

after the 15 minute delay, then resume operation with a

call for cooling or heating.

6. If LPS or HPS trips 3 consecutive cycles, the unit

operation is locked out for 4 hours.

7. In the event of a high-pressure switch trip or

high-pressure lockout, check the refrigerant charge,

outdoor fan operation, and outdoor coil (in cooling) for

airflow restrictions, or indoor airflow in heating.

8. In the event of a low-pressure switch trip or low-pressure

lockout, check the refrigerant charge and indoor airflow

(cooling) and outdoor fan operation and outdoor coil in

heating.

Control Fault

If the outdoor unit control board has failed, the control will flash

the appropriate fault code (see Table 5). The control board should

be replaced.

Brown-Out Protection

If the line voltage is less than 187v for at least 4 seconds, the

appropriate compressor contactor and fan relay are de-energized.

Compressor and fan operation are not allowed until voltage is a

minimum of 190v. The control will flash the appropriate fault

code (see Table 5).

230V Line (Power Disconnect) Detection

If there is no 230v at the compressor contactor(s) when the indoor

unit is powered and cooling or heating demand exists, the

appropriate fault code is displayed. Verify the disconnect is dosed

and 230v wiring is connected to the unit.

Compressor Voltage Sensing

The control board input terminals labeled VS. VR and L2 on

25HNA6 models and VS and L2 on 25HNA9 models (see Fig. 9)

are used to detect compressor voltage status, and alert the user of

potential problems. The control continuously monitors the high

voltage on the run capacitor of the compressor motor. Voltage

should be present any time the compressor contactor is energized.

and voltage should not be present when the contactor is

de-energized.

ContactorShorted Detection

If there is compressor voltage sensed when there is no demand for

compressor operation, the contactor may be stuck closed or there

may be a wiring error. The control will flash the appropriate fault

code.

25HNA6 Models_ Compressor Thermal Cutout

The control senses the compressor voltage at VR and VS. When

starting or running, a phase difference of the voltages on the

inputs will indicate the thermal protector is closed. If the phase

difference is 5 degrees or less for 10 seconds, the internal

protector is open. The control de-energizes the appropriate

compressor contactor for 15 minutes, but continues to operate the

outdoor fan. The control Status LED will flash the appropriate

code shown in table 5. After 15 minutes, with a call for low or

high stage cooling or heating, the appropriate compressor

contactor is energized. If the thermal protector has not re-set, the

outdoor fan is turned off. If the call for cooling or heating

continues, the control will energize the compressor contactor

every 15 minutes. If the thermal protector closes, (at the next 15

minute interval check), the unit will resume operation.

If the thermal cutout trips for three consecutive cycles, then unit

operation is locked out for 4 hours and the appropriate fault code

is displayed.

25HNA9 Compressor Thermal Cutout

If the control senses the compressor voltage after start-up, and is

then absent for 10 consecutive seconds while cooling or heating

demand exists, the thermal protector is open. The control

de-energizes the compressor contactor for 15 minutes, but

continues to operate the outdoor fan. The control Status LED

will flash the appropriate code shown in table 5. After 15

minutes, with a call for low or high stage cooling or heating, the

compressor contactor is energized. If the thermal protector has

not re-set, the outdoor fan is turned off. If the call for cooling or

heating continues, the control will energize the compressor

contactor every 15 minutes. If the thermal protector closes. (at

the next 15 minute interval check), the unit will resume operation.

If the thermal cutout trips for three consecutive cycles, then unit

operation is locked out for 4 hours and the appropriate fault code

is displayed.

Low- or High Contactor Open (25HNA6 models) /No 230V at

Compressor Contractor (25HNA9 models)

If the compressor voltage is not sensed when the compressor

should be starting, the appropriate contactor may be stuck open or

there is a wiring error. The control will flash the appropriate fault

code. Check the contactor and control box wiring.

25HNA6 Models Only - Compressor Start Detection on

Bristol Models Only

In low stage, if the specified start voltage at VR terminal is not

achieved, the start relay is de-energized after 1 second and the

control will flash the appropriate fault code.

In high stage, if the specified start voltage at VS terminal is not

achieved, the start relay is de-energized after 1 second and the

control will flash the appropriate fault code.

If the specified start voltage is not achieved for 3 consecutive low

stage starts, low stage operation is locked out for 30 minutes. If

the specified start voltage is not achieved for 3 consecutive high

stage starts, high stage operation is locked out for 30 minutes.

The control will flash the appropriate fault code.

Troubleshooting 25HNA6 units for pl_oper switching between

low & hiuh staues

Check the suction and liquid pressures at the service valves.

Suction pressure should be reduced by 5-10% when switching

from low to high capacity. There should be a10-20% increase in

liquid pressure when switching from low to high capacity.

Compressor current should increase 100-250% when switching

from low to high stage.

Troubleshooting 25HNA9 units for proper switching between

low & hiuh staues

Check the suction pressures at the service valves. Suction

pressure should be reduced by 3-10% when switching from low

to high capacity.

NOTE: The liquid pressures are very similar between low and

high stage operation, so liquid pressure should not be used for

troubleshooting.

Compressor current should increase 20-45% when switching

from low to high stage. The compressor solenoid when

energized in high stage, should measure 24vac.

Temperature Thermistors

Thermistors are electronic devices which sense temperature. As

the temperature increases, the resistance decreases. Thermistors

are used to sense outdoor air (OAT) and coil temperature (OCT).

Refer to Fig. 12 for resistance values versus temperature.

If the outdoor air or coil thermistor should fail. the control will

flash the appropriate fault code. (See Table 5.)

IMPORTANT: The outdoor air thermistor and coil thermistor

should be factory mounted in the final locations. Check to

insure thermistors are mounted properly per Fig. 10 and Fig.

11.

Thermistor Sensor Comparison

The control continuously monitors and compares the outdoor air

temperature sensor and outdoor coil temperature sensor to ensure

proper operating conditions. The comparison is:

• In cooling if the outdoor air sensor indicates >- 10_'F

warmer than the coil sensor (or) the outdoor air sensor

indicates >-20°F cooler than the coil sensor, the sensors

are out of range.

• In heating if the outdoor air sensor indicates ->35 °F

warmer than the coil sensor (or) the outdoor air sensor

indicates >-10°F cooler than the coil sensor, the sensors

are out of range.

If the sensors are out of range, the control will flash the

appropriate fault code as shown in Table 5.

The thermistor comparison is not performed during low ambient

cooling or defrost operation.

Failed Thermistor Default Operation

Factory defaults have been provided in the event of failure of

outdoor air thermistor and/or coil thermistor.

If the OAT sensor should fail, low ambient cooling will not be

allowed and the one-minute outdoor fan off delay will not occur.

Defrost will be initiated based on coil temperature and time.

If the OCT sensor should fail, low ambient cooling will not be

allowed. Defrost will occur at each time interval during heating

operation, but will terminate after 5 minutes.

If there is a thermistor out of range error, defrost will occur at

each time interval during heating operation, but will terminate

after 5 minutes.

Count the number of short and long flashes to determine the

appropriate flash code. Table 5 gives possible causes and actions

related to each error.

OAT Thermistor must be locked in

place with spherical nib end facing to-

wards the front of the control box

OCT Thermistor

must be secured

tight on stub tube

nFig, 10 - Outdoor Air Thermistor (OAT) Attachment Fig. 11 -Outdoor Coil Thermistor (OCT) Attachment

THERMISTOR CURVE

90 ,

20 40 60 80 100 120

TEMPERATURE (DEG. F)

Fig. 12 - Resistance Values Versus Temperature

A91431

Table 4--Two-Stage Compressor Resistances

(Winding Resistance at 70°F_+20 °)

Winding 25HNA6024 25HNA6036 25HNA6048 25HNA6060

Start (S-C) 2.74 1.98 1.55 0.74

Run (R-C) 0.80 0.75 0.48 0.36

Winding 25HNA9024 25HNAg036 25HNA9048 25HNAg060

Start (S-C) 1.40 1.29 1.52 0.60

Run (R-C) 1.32 0.89 0.64 0.49

Status (:odes

Table 5 shows the status codes flashed by the amber status light. Most system problems can be diagnosed by reading the status code as

flashed by the amber status light on the control board.

The codes are flashed by a series of short and long flashes of the status light. The short flashes indicate the first digit in the status code.

followed by long flashes indicating the second digit of the error code. The short flash is 0.25 seconds ON and the long flash is 1.0 second

ON. Time between flashes is 0.25 seconds. Time between short flash and first long flash is 1.0 second. Time between code repeating is 2.5

seconds with LED OFF.

EXAMPLE:

3 short flashes followed by 2 long flashes indicates a 32 code. Table 5 shows this to be low pressure switch open.

Table 5--TROUBLESHOOTING

AMBER

LED

OPERATION FAULT POSSIBLE CAUSE AND ACTION

FLASH

CODE

Standby no call for unit opera- None On solid, Normal operation

tion no flash

Standard Thermo- Rapid,con- Unit being controlled by standard thermostat inputs instead of tnfinity Con-

Emergency Mode - Modet 25HNA9 stat Control tinuous flash- trol. Only high stage operation is available. This operatimg mode should be

only (25HNA9only) ing used in emergency situations only.

Low Stage Cool/Heat Operation None 1, pause Normal operation

High Stage Coot/Heat Opera-

tion None 2, pause Normal operation

System Commu- 16 Communication with user interface lost. Check wiring to UI, indoor

nications Failure and outdoor units

Invalid Model 25 Control does not detect a modeI ptug or detects an invalid model

Plug plug. Unit wili not operate without correct model plug.

High Pressure 31 High-pressure switch trip. Check refrigerant charge, outdoor fan

Switch Open operation and coils for airflow restrictions.

Low Pressure 32 Low pressure switch trip. Check refrigerant charge and indoor air

Switch Open flow

Outdoor unit control board has failed. Control board needs to be

Control Fault 45 replaced.

Brown Out (230 46 Line voltage < 187v for at least 4 seconds. Compressor and fan

v) operation not allowed until voItage>190v. Verify line voltage.

There is no 230v at the contactor when indoor unit is powered and

No 230v at Unit 47 cooling/heating demand exists. Verify the disconnect is closed and

230v wiring is connected to the unit.

Outdoor Air Outdoor air sensor not reading or out of range. Ohm out sensor

Temp Sensor 53 and check wiring.

Fault

Outdoor Coil 55 Coii sensor not reading or out of range. Ohm out sensor and check

Sensor Fault wiring.

Thermistors out 56 Improper relationship between colt sensor and outdoor air sensor.

of range Ohm out sensors and check wiring.

No voltage phase difference is detected (on 25HNA6 models) or

Low Stage Ther- 71 compressor voltage sensed, then disappears (on 25HNA9 models)

mal Cutout while cooling or heating demand exists. Possible causes are inter-

nal compressor overload trip or start relay not releasing (if installed).

No voltage phase difference is detected (on 25HNA6 models) or

High Stage Ther- 72 compressor voltage sensed, then disappears (on 25HNA9 models)

mal Cutout while cooling or heating demand exists. Possible causes are inter-

nal compressor overload trip or start relay not releasing (if installed).

Contactor Compressor voltage sensed when no demand for compressor op-

73 eration exists. Contactor may be stuck closed or there is a wiring

Shorted error.

No 230V at

Compressor 74 Compressor voltage not sensed when compressor should be start-

(25HNA9 Only) ing. Contactor may be stuck open or there is a wiring error.

Low Stage Did Specified start voltage at VR terminal was not achieved in low stage.

Not Start 75

(25HNA6 Only) Start relay was de-energized after 1 second.

Low Stage Did For 3 consecutive low stage starts, the specified start voltage at VR

Not Start 3 times 76 terminal was not achieved & start relay was de-energized. Low

(25HNA6OnIy) stage locked out for 30 minutes.

High Stage Did Specified start voltage at VS terminal was not achieved in high

Not Start 77

(25HNA6 Only) stage. Start relay was de-energized after 1 second.

High Stage Did For 3 consecutive high stage starts, the specified start voltage at VS

Not Start 3 times 78 terminal was not achieved & start relay was de-energized. High

(25HNA6 Only) stage locked out for 30 minutes.

Low Stage Ther- 81 Thermal cutout occurs in three consecutive low/high stage cycles.

mal Lockout Low stage locked out for 4 hours or untiI 24v power recycled.

High Stage Ther- 82 Thermal cutout occurs in three consecutive high/low stage cycles.

mal Lockout High stage locked out for 4 hours or until 24v power recycled.

Low Pressure 83 Low pressure switch trip has occurred during 3 consecutive cycles.

Lockout Unit operation locked out for 4 hours or until 24v power recycled.

High Pressure 84 High pressure switch trip has occurred during 3 consecutive cycles.

Lockout Unit operation locked out for 4 hours or until 24v power recycled.

Low Contactor Compressor voltage not sensed when compressor should be start-

Open 85 ing. Low stage contactor may be stuck open or there is a wiring

(25HNA6 Only) error.

High Contactor Compressor voltage not sensed when compressor should be start-

Open 87 ing. High stage contactor may be stuck open or there is a wiring

(25HNA6 Only) error.

INDOOR CONTROL

RVS COOLING

HEAT/COOL

STAGE 1

HEAT STAGE 3

HEAT/COOL

STAGE 2

FAN E]_

24 VAC HOT D

DEHUMIDIFY E_

24VAC COMM E_

HUMIDIFY r_,

RVS HEATING r_

OUTDOORI-r_.

SENSOR _

OONNEOTIONL_Lt_J"

FAN COIL 2-SPEED

HEAT PUMP

.... I-q-Q

....

.... -4_}-.5.--_MO_

----1 D_'JUMPERFOR

--HEAT STAGING

I_ _[_]

L-.E}. _REMOVE J] FOR

__ DEHUMIDIFY

.... MODES

....

__&_IHUM'D'F'ERI___J

[ (24 MAC) ]

___OUTDOOR___

SENSOR

A02005

Fig, 13 - Infinity Wiring with 2-Stage Puron refrigerant

Heat Pump (non-communicating)

(applies to 25HNA6 Models Only)

HybridHeat

THERMOSTAT TWO-STAGE

FURNACE

TWO-STAGE

HEATRUMP

RVS COOLING r_

HEAT/COOL STAGE 1

(COMPRESSOR I O}

HEAT STAGE 3

(F RNACE/

HEAT/COOL STAGE 2

(COMPRESSOR HI}

FAN

24 VAC HOT

24 VAC COMM

N/A [_

RVS SENSING [_

GON"EOT'O"LF_

i w? i i

- - - I_LI- I- - -

_ _ _ 4_R_l- I_ _ _

FF@_q I

- - - 4 UOM 1- I- --

II HUM I

_ _ _ OUTDOOR ]_

SENSOR

J _uI

t]-L4_]

A06157

Fi9, 14 -HybridHeat TM Thermostat with Two-Stage

Furnace and Two-Stage Heat Pump (non-communicating)

User Interface Fan Coil Communicating AC//HP

::D

Fig 9 - FE4A Fan Coil Wiring with 2-Speed AC/HP

A03076

Fig, 15 - Infinity Furnace el" Fan (:oil Wiring with Communicating Two-Stage AC /HP

FINALCHECKS

IMPORTANT:Beforeleavingjob,besuretodothefollowing:

1.Ensurethatallwiringisroutedawayfromtubingand

sheetmetaledgesto preventrub-throughor wire

pinching.

2.Ensurethatallwiringandtubingissecureinunitbefore

addingpanelsandcovers.Securelyfastenallpanelsand

covers.

3.Tightenservicevalvestemcapsto1/12-turnpastfinger

tight.

4.LeaveUsersManualwith owner.Explainsystem

operationandperiodicmaintenancerequirementsoutlined

inmanual.

5.FilloutDealerInstallationChecklistandplacein

customerfile.

CAREANDMAINTENANCE

Forcontinuinghighperformanceandto minimizepossible

equipmentfailure,periodicmaintenancemustbeperformedon

thisequipment.

Frequencyofmaintenancemayvarydependingupongeographic

areas,suchascoastalapplications.SeeOwner'sManualfor

information.

PURON®(R-410A)REFRIGERANTQUICK REFERENCE GUIDE

• Puron refrigerant operates at 50-70 percent higher pressures than R-22. Be sure that servicing equipment and replacement

components are designed to operate with Puron refrigerant

• Puron refrigerant cylinders are rose colored.

• Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.

• Puron refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose

when charging into suction line with compressor operating

• Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low-side retard.

• Use hoses with 700 psig service pressure rating.

• Leak detectors should be designed to detect HFC refrigerant.

• Puron refrigerant, as with other HFCs. is only compatible with POE oils.

• Vacuum pumps will not remove moisture from oil.

• Do not use liquid-line filter driers with rated working pressures less than 600 psig.

• Do not leave Puron suction line filter driers in line longer than 72 hours.

• Do not install a suction-line filter drier in liquid line.

• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.

• POE oils may cause damage to certain plastics and roofing materials.

• Wrap all filter driers and service valves with wet cloth when brazing.

• A factory approved liquid-line filter drier is required on every unit.

• Do NOT use an R-22 TXV.

• If indoor unit is equipped with an R-22 TXV or piston metering device, it must be changed to a hard shutoff Puron TXV.

• Never open system to atmosphere while it is under a vacuum.

• When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter driers.

Evacuate to 500 microns prior to recharging.

• Do not vent Puron refrigerant into the atmosphere.

• Do not use capillary tube coils.

• Observe all warnings, cautions, and bold text.

•All indoor coils must be installed with ahard shutoff Puron TXV metering device.

Mannfae_urer rese_'es the tlght to change, at any time. speeifieations and designs without notice and wit hou_ obligations.

Catalo_ No: 25HNA-2SI

Replaces:25HNA ISI

CARRIER Air Conditioner/heat Pump(outside Unit) Manual L0604185

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