Daikin DCH048 SERIES Operating instructions

This manual is to be used by qualified, professionally trained HVAC
technicians only. Daikin does not assume any responsibility for property
damage or personal injury due to improper service procedures or services
performed by an unqualified person. RSDX6412006r1
November2016
DCC Cooling/DCH Heat Pumps
Commercial Package Units
with R-410A Refrigerant
4 - 6 Tons & Accessories
Service Instructions
Copyright © 2015 - 2016
Not for installation in the United States or Canada.This unit is for export only.

IMPORTANTINFORMATION
Prideandworkmanshipgointoeveryproducttoprovideourcustomerswithqualityproducts. Itispossible,however,
that during its lifetime a product may require service. Products should be serviced only by a qualified service
technicianwhoisfamiliarwiththesafetyproceduresrequiredintherepairandwhoisequippedwiththeproper tools,
parts, testing instruments and the appropriate service manual. REVIEW ALL SERVICE INFORMATION IN THE
APPROPRIATE SERVICE MANUAL BEFORE BEGINNING REPAIRS.
IMPORTANT NOTICES FOR CONSUMERS AND SERVICERS
RECOGNIZESAFETYSYMBOLS,WORDSANDLABELS
TABLE OF CONTENTS
2
To locate an authorized servicer, please consult your telephone book or the dealer from whom you purchased this
product. For further assistance, please contact:
Do not store combustible materials or use gasoline
or other flammable liquids or vapors in the vicinity
of this appliance as property damage or personal
injury could occur. Have your contractor point out
and identify the various cut-off devices, switches,
etc., that serves your comfort equipment.
CONSUMERINFORMATIONLINE-DAIKINBRANDPRODUCTS
TOLL FREE 1-855-770-5678 (U.S. only)
email us at: [email protected]
fax us at: [phone]
(Not a technical assistance line for dealers.)
Outside the U.S., call 1-713-861-2500
(Not a technical assistance line for dealers.)
Your telephone company will bill you for the call.
IMPORTANTINFORMATION .................................2 - 3
PRODUCTIONIDENTIFICATION ..........................4 - 6
PRODUCTDESIGN .............................................7 - 10
SYSTEMOPERATION.......................................11 - 16
SCHEDULEDMAINTENANCE ................................. 17
TROUBLESHOOTINGCHARTS ................................ 18
SERVICINGTABLEOFCONTENTS ........................ 19
SERVICING .......................................................20 - 39
UNITWIRINGDIAGRAMS ....................................... 40
O NLY PERSONNEL THAT HAVE BEEN TRAINED TO INSTALL ,
ADJUST , SERVICE OR REPAIR ( HEREINAFTER , “ SERVICE ”) THE
EQUIPMENT SPECIFIED IN THIS MANUAL SHOULD SERVICE THE
EQUIPMENT . T HE MANUFACTURER WILL NOT BE RESPONSIBLE
FOR ANY INJURY OR PROPERTY DAMAGE ARISING FROM
IMPROPER SERVICE OR SERVICE PROCEDURES . I F YOU SERVICE
THIS UNIT , YOU ASSUME RESPONSIBILITY FOR ANY INJURY OR
PROPERTY DAMAGE WHICH MAY RESULT . I N ADDITION , IN
JURISDICTIONS THAT REQUIRE ONE OR MORE LICENSES TO
SERVICE THE EQUIPMENT SPECIFIED IN THIS MANUAL , ONLY
LICENSED PERSONNEL SHOULD SERVICE THE EQUIPMENT .
I
MPROPER INSTALLATION , ADJUSTMENT , SERVICING OR REPAIR
OF THE EQUIPMENT SPECIFIED IN THIS MANUAL , OR ATTEMPTING
TO INSTALL , ADJUST , SERVICE OR REPAIR THE EQUIPMENT
SPECIFIED IN THIS MANUAL WITHOUT PROPER TRAINING MAY
RESULT IN PRODUCT DAMAGE , PROPERTY DAMAGE , PERSONAL
INJURY OR DEATH .
HIGH VOLTAGE!
Disconnect ALL power before
servicing or installing this unit.
Multiple power sources may be
present. Failure to do so may cause
property damage, personal injury or death.

3
Thesuccessfuldevelopmentofhermeticallysealedrefrigera-
tioncompressors hascompletely sealedthe compressor's
movingparts andelectric motorinside acommon housing,
minimizing refrigerant leaks and the hazards sometimes
associated with moving belts, pulleys or couplings.
Fundamental to the design of hermetic compressors is a
method whereby electrical current is transmitted to the
compressormotorthroughterminalconductorswhichpass
throughthecompressorhousingwall. Theseterminalsare
sealedinadielectricmaterialwhichinsulatesthemfromthe
housing and maintains the pressure tight integrity of the
hermetic compressor. The terminals and their dielectric
embedmentarestronglyconstructed,butarevulnerableto
careless compressor installation or maintenance proce-
dures and equally vulnerable to internal electrical short
circuits caused by excessive system contaminants.
WARNING
To avoid possible injury, explosion or death, practice
safe handling of refrigerants.
SAFE REFRIGERANT HANDLING
Whiletheseitemswillnotcovereveryconceivablesituation,theyshouldserve as a useful guide.
Ineitheroftheseinstances,an electrical short between the
terminalandthe compressor housing may resultinthe loss
of integrity between the terminal and its dielectric embed-
ment. This loss may cause the terminals to be expelled,
thereby venting the vaporous and liquid contents of the
compressor housing and system.
Aventingcompressorterminalnormallypresentsnodanger
toanyone,providingtheterminalprotectivecoverisproperly
in place.
If, however, the terminal protective cover is not properly in
place,a ventingterminalmaydischargea combinationof
(a) hotlubricatingoilandrefrigerant
(b) flammable mixture (if system is contaminated
withair)
inastreamofspraywhichmaybedangeroustoanyoneinthe
vicinity. Death or serious bodily injury could occur.
Under no circumstances is a hermetic compressor to be
electrically energized and/or operated without having the
terminalprotectivecoverproperlyinplace.
SeeServiceSectionS-17forproperservicing.
IMPORTANTINFORMATION
Refrigerants are heavier than air.They can "push out"
the oxygen in your lungs or in any enclosed space.To
avoid possible difficulty in breathing or death:
Never purge refrigerant into an enclosed room or
space. By law, all refrigerants must be reclaimed.
If an indoor leak is suspected, thoroughly ventilate
the area before beginning work.
• Liquid refrigerant can be very cold. To avoid possible
frostbite or blindness, avoid contact with refrigerant
andwearglovesand goggles. If liquid refrigerant
doescontactyourskin oreyes,seekmedicalhelp
immediately.
•
•
WARNING
System contaminants, improper service procedure
and/or physical abuse affecting hermetic compressor
electrical terminals may cause dangerous system
venting.
To avoid possible explosion, use only returnable (not
disposable) service cylinders when removing refrig-
erant from a system.
• Ensure the cylinder is free of damage which could
lead to a leak or explosion.
• Ensure the hydrostatic test date does not exceed
5 years.
• Ensure the pressure rating meets or exceeds 400
lbs.
When in doubt, do not use cylinder.
The compressor POE oil for R-410A units is
extremely susceptible to moisture absorption and
could cause compressor failure. Do not leave system
open to atmosphere any longer than necessary
for installation.

PRODUCTIDENTIFICATION
4
Themodelnumberisusedforpositiveidentificationofcomponentpartsusedinmanufacturing. Pleaseusethisnumberwhen
requestingserviceorpartsinformation.
DCC090045 5D***
A*
1 2 3 4, 5, 6 7, 8, 9 10 11 12 13 14 15 16
Brand
DDaikin Major & Minor
Configuration
C Standard Efficiency XNoOptions
Application
C Cooling X Standard Aluminized HeatExchange
r
HHeatPump S Stainless Steel Gas Heat Exchanger
Nominal Gross Cooling Capacit
y
XNoOptions
036 3 Tons 102 8½ Tons
048 4 Tons 120 10 Tons
060 5 Tons 180 15 Tons
072 6 Tons 240 20 Tons BBeltDrive
090 7½Tons D DirectDrive
Nominal Heating Capacit
y
Gas/Electric A/C H/P Factory-Installed Electric Heat
180 180,000 BTU/h XXX No Heat 030 30 kW 1 208-230/1/60 (United States) 4 460/3/60 (United States)
300 300,000 BTU/h 016 15 kW 045 44 kW 3 208-230/3/60 (United States) 5 400/3/50(Russia DaikinBrand)
350 350,000 BTU/h 6 400/3/60 (Saudi Arabia) A 400/3/50 (Russia Goodman Brand)
B 400/3/50 (Kuwait) E 400/3/50 (Argentina)
See product specifications for heat size(s) available for each capacity.
Voltage
Revision Levels
Factory-Installed Options
Factory-Installed Options
Factory-Installed Options
Supply Fan/Drive Type/Motors

PRODUCTIDENTIFICATION
5
DCH***XXX**XXX
These units have R410A refrigerant
Models Description
DCH[048-060]XXX6DXXXAA Daikin Commercial Package Heat Pump, Multiposition heat pump units, 400V 3 Phase, 60 Hz Direct Drive. Initial release
of Daikin branded models.
DCH072XXX6BXXXAA Daikin Commercial Package Heat Pump, Multiposition heat pump units, 400V 3 Phase, 60 Hz Direct Drive. Initial release
of Daikin branded models.
DCH048XXX6DXXXAD
DCH060XXX6DXXXAC Daikin Commercial Package Heat Pump, Multiposition heat pump units, 400V 3 Phase, 60 Hz Direct Drive with Phase Monitor.
DCH072XXX6BXXXAC Daikin Commercial Package Heat Pump, Multiposition heat pump units, 400V 3 Phase, 60 Hz Direct Drive with Phase
Monitor.
Daikin Commercial Multiposition Package Heat Pumps

PRODUCTIDENTIFICATION
6These units have R410A refrigerant
DCC***XXX**XXX
Models Description
DCC[048-060]XXX6DXXXAA Daikin Commercial Package Cooler, Multiposition cooling, 400V 3 Phase, 60 Hz Direct Drive. Initial release of 4-5 Ton
Daikin branded models.
DCC072XXX6BXXXAA Daikin Commercial Package Cooler, Multiposition cooling, 400V 3 Phase, 60 Hz Direct Drive. Initial release of 4-5 Ton
Daikin branded models.
DCC[048-060]XXXBDXXXAA Daikin Commercial Package Cooler, Multiposition cooling, 400V 3 Phase, 60 Hz Direct Drive. Initial release of Daikin
branded models with SASO level 2 regulations.
DCC[048-060]XXX6DXXXAC Daikin Commercial Package Cooler, Multiposition cooling, 400V 3 Phase, 50 Hz Direct Drive with Phase Monitor.
DCC072XXX6BXXXAC Daikin Commercial Package Cooler, Multiposition cooling, 400V 3 Phase, 50 Hz Direct Drive with Phase Monitor.
Daikin Commercial Multiposition Package Coolers

PRODUCT DESIGN
7
UNIT LOCATION
WARNING
TO PREVENT POSSIBLE EQUIPMENT DAMAGE, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH, THE FOLLOWING BULLET POINTS MUST BE OBSERVED
WHEN INSTALLING THE UNIT.
IMPORTANT NOTE: Remove wood shipping rails prior to
installation of the unit.
ALLINSTALLATIONS:
NOTE: Applianceis shippedfrom factoryfor verticalduct
application.
Properinstallationoftheunitensurestrouble-freeoperation.
Improper installation can result in problems ranging from
noisyoperationtopropertyorequipmentdamages,danger-
ousconditionsthatcouldresultininjuryorpersonalproperty
damage. Give this booklet to the user and explain it’s
provisions.Theusershouldretaintheseinstructionsforfuture
reference.
•Forproperflamepatternwithintheheatexchangerand
propercondensatedrainage,theunitmustbemounted
level.
•The flue outlet must be at least 12 inches from any
openingthroughwhichfluegasescouldenterabuilding,
andatleastthreefeetaboveanyforcedairinletlocated
withintenfeet.Theeconomizer/manualfreshairintake/
motorized fresh air intake and combustion air inlet
mounted on the unit are not affected by this restriction.
•Toavoidpossiblecorrosionoftheheatexchanger,donot
locate the unit in an area where the outdoor air (i.e.
combustion air for the unit) will be frequently contami-
nated by compounds containing chlorine or fluorine.
Commonsourcesofsuchcompoundsincludeswimming
pool chemicals and chlorine bleaches, paint stripper,
adhesives,paints,varnishes,sealers,waxes(whichare
notyetdried)andsolventsusedduringconstructionand
remodeling.Variouscommercialandindustrialprocesses
mayalsobesourcesofchlorine/fluorinecompounds.
•To avoid possible illness or death of the building occu-
pants, do NOT locate outside air intake device (econo-
mizer,manualfreshairintake,motorizedfreshairintake)
too close to an exhaust outlet, gas vent termination, or
plumbing vent outlet. For specific distances required,
consult local codes.
•Allow minimum clearances from the enclosure for fire
protection, proper operation, and service access (see
unit clearances). These clearances must be perma-
nentlymaintained.
•Thecombustionairinletandflueoutletontheunitmust
never be obstructed. If used, do not allow the econo-
mizer/manualfreshairdamper/motorizedfreshairdamper
tobecomeblockedbysnowordebris.Insomeclimates
or locations, it may be necessary to elevate the unit to
avoidtheseproblems.
•Whentheunitisheating,thetemperatureofthereturnair
entering the unit must be a minimum of 55° F.
GROUND LEVEL INSTALLATIONS ONLY:
•Whenthe unit isinstalledon thegroundadjacent to the
building, a level concrete (or equal) base is recom-
mended. Prepare a base that is 3” larger than the
package unit footprint and a minimum of 3” thick.
•Thebaseshouldalsobelocatedwherenorunoffofwater
from higher ground can collect in the unit.
ROOF TOPINSTALLATIONS ONLY:
•Toavoidpossiblepropertydamageorpersonalinjury,the
roofmusthavesufficientstructuralstrengthtocarrythe
weightoftheunit(s)andsnoworwaterloadsasrequired
by local codes. Consult a structural engineer to deter-
mine the weight capabilities of the roof.
•The unit may be installed directly on wood floors or on
Class A, Class B, or Class C roof covering material.
•Toavoidpossiblepersonalinjury,asafe,flatsurfacefor
servicepersonnelshouldbeprovided.
•Asindicatedontheunitdataplate,aminimumclearance
of 36” to any combustible material is required on the
furnace access side of the unit. All combustible mate-
rials must be kept out of this area.
•This 36” clearance must also be maintained to insure
propercombustionairandfluegasflow. Thecombustion
airintakeandfurnacefluedischargemustnotbeblocked
for any reason, including blockage by snow.
•Adequateclearancesfromthefurnacefluedischargeto
anyadjacentpublicwalkways,adjacentbuildings,build-
ingopeningsoropenablewindowsmustbemaintainedin
accordance with the latest edition of the National Fuel
GasCode(ANSIZ223.1)
•Minimumhorizontalclearanceof48”fromthefurnaceflue
dischargetoanyelectricmeters,gasmeters,regulators
andreliefequipmentisrequired.
UNITPRECAUTIONS
• Do not stand or walk on the unit.
• Do not drill holes anywhere in panels or in the base
frameoftheunitexceptwhereindicated. Unitaccess
panelsprovidestructuralsupport.
• Donot remove anyaccesspanels untilunithas been
installedon roof curborfield suppliedstructure.
• Do not roll unit across finished roof without prior
approvalofownerorarchitect.
• Donotskidorslideonanysurfaceasthismaydamage
unit base. The unit must be stored on a flat, level
surface. Protect the condenser coil because it is
easilydamaged.

PRODUCT DESIGN
8
ROOF CURB INSTALLATIONS ONLY:
Curbinstallations mustcomplywith localcodesand should
bedoneinaccordancewiththeestablishedguidelinesofthe
NationalRoofingContractorsAssociation.
Proper unit installation requires that the roof curb be firmly
and permanently attached to the roof structure. Check for
adequate fastening method prior to setting the unit on the
curb.
Fullperimeterroofcurbsareavailablefromthefactoryandare
shipped unassembled. Field assembly, squaring, leveling
andmountingontheroofstructurearetheresponsibilityofthe
installingcontractor. Allrequiredhardwarenecessaryforthe
assembly of the sheet metal curb is included in the curb
accessory.
WARNING
TO PREVENT POSSIBLE EQUIPMENT DAMAGE, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH, THE FOLLOWING BULLET POINTS MUST BE OBSERVED
WHEN INSTALLING THE UNIT.
•Sufficientstructuralsupportmustbedeterminedpriorto
locating and mounting the curb and package unit.
•Ductwork must be constructed using industry guide-
lines. The duct work must be placed into the roof curb
before mounting the package unit. Our full perimeter
curbs include duct connection frames to be assembled
withthecurb. Cantileveredtypecurbsarenotavailable
fromthefactory.
•Curbinsulation,cantstrips,flashingandgeneralroofing
materialare furnishedbythe contractor.
The curbs must be supported on parallel sides by roof
members. Theroofmembersmustnotpenetratesupplyand
returnductopeningareasasdamagetotheunitmightoccur.
NOTE:The unitand curbaccessories aredesigned to
allow vertical duct installation before unit placement. Duct
installationafter unit placementisnot recommended.
A LL CURBS LOOK SIMILAR . T O AVOID INCORRECT CURB
POSITIONING , CHECK JOB PLANS CAREFULLY AND VERIFY MARKINGS
ON CURB ASSEMBLY . I NSTRUCTIONS MAY VARY IN CURB STYLES AND
SUPERSEDES INFORMATION SHOWN .
CAUTION
Seethemanualshippedwiththeroofcurbforassemblyand
installation instructions.
CLEARANCES
24”
Min.* 24”
Min.*
36” Min.
*
Unit Clearances
*Insituationsthathavemultipleunits,a48”minimumclearance
isrequiredbetweenthecondensercoils.
Adequateclearancearoundtheunitshouldbekeptforsafety,
service, maintenance, and proper unit operation. A total
clearanceof75”onthemaincontrolpanel sideoftheunitis
recommended to facilitate possible fan shaft, coil, electric
heat and gas furnace removal. A clearance of 48” is
recommended on all other sides of the unit to facilitate
possiblecompressorremoval,toallowserviceaccessandto
insureproperventilationandcondenserairflow. Theunitmust
notbeinstalledbeneathanyobstruction. Theunitshouldbe
installedremotefromallbuildingexhauststoinhibitingestion
of exhaust air into the unit fresh air intake.
PROTRUSION
Inspect curb to ensure that none of the utility services
(electric)routedthroughthecurbprotrudeabovethecurb.
ELECTRICAL WIRING
HIGH VOLTAGE!
D
ISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT . M ULTIPLE POWER SOURCES MAY
BE PRESENT . F AILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE , PERSONAL INJURY OR DEATH .
WARNING

PRODUCT DESIGN
9
HIGH VOLTAGE!
T
O AVOID PERSONAL INJURY OR DEATH DUE TO
ELECTRICAL SHOCK , DO NOT TAMPER WITH FACTORY
WIRING . T HE INTERNAL POWER AND CONTROL WIRING
OF THESE UNITS ARE FACTORY - INSTALLED AND HAVE
BEEN THOROUGHLY TESTED PRIOR TO SHIPMENT .
C
ONTACT YOUR LOCAL REPRESENTATIVE IF
ASSISTANCE IS REQUIRED .
WARNING
T O PREVENT DAMAGE TO THE WIRING , PROTECT WIRING FROM
SHARP EDGES . F OLLOW NATIONAL ELECTRICAL CODE AND ALL
LOCAL CODES AND ORDINANCES . D O NOT ROUTE WIRES THROUGH
REMOVABLE ACCESS PANELS .
CAUTION
C ONDUIT AND FITTINGS MUST BE WEATHER - TIGHT TO PREVENT
WATER ENTRY INTO THE BUILDING .
CAUTION
For unit protection, use a fuse or HACR circuit breaker that
isin excessofthe circuitampacity,but lessthanor equalto
the maximum overcurrent protection device. DO NOT EX-
CEED THE MAXIMUM OVERCURRENT DEVICE SIZE
SHOWNONUNITDATAPLATE.
Alllinevoltageconnectionsmustbemadethroughweather-
proof fittings. All exterior power supply and ground wiring
mustbeinapprovedweatherproofconduit.
The main power supply wiring to the unit and low voltage
wiring to accessory controls must be done in accordance
with these instructions, the latest edition of the National
Electrical Code (ANSI/NFPA 70), and all local codes and
ordinances. Allfieldwiring shall conform with thetempera-
turelimitationsforTypeTwire(63°F/35°Crise).
The unit is factory wired for the voltage shown on the unit’s
data plate. Refer to model nomenclature in Appendix B for
voltagerequirementforyourunit.
NOTE: If supply voltage is 208V, lead on primary of trans-
formermustbemovedfromthe230Vtothe208Vtap.Refer
towiringdiagramon unit for details.
Main power wiring should be sized for the minimum wire
ampacity shown on the unit’s database. Size wires in
accordance with the ampacity tables in Article 310 of the
NationalElectricalCode. Iflongwiresarerequired,itmaybe
necessary to increase the wire size to prevent excessive
voltage drop. Wires should be sized for a maximum of 3%
voltagedrop.
CAUTION
TO AVOID PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE, USE
ONLY COPPER CONDUCTORS.
CAUTION
TO PREVENT IMPROPER AND DANGEROUS OPERATION DUE TO WIRING ERRORS,
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS.
VERIFY PROPER OPERATION AFTER SERVICING.
NOTE:A weather-tightdisconnect switch,properlysized
for the unit total load, must be field or factory installed. An
external field supplied disconnect may be mounted on the
exteriorpanel.
Ensurethedata plate isnotcovered by the field-supplied
disconnect switch.
• Some disconnect switches are not fused. Protect the
powerleadsatthepointofdistributioninaccordancewith
the unit data plate.
• The unit must be electrically grounded in accordance
with local codes or, in the absence of local codes, with
thelatest editionof theNational ElectricalCode(ANSI-
NFPA70). Agroundlugisprovidedforthispurpose. Size
groundingconductorinaccordancewithTable250-95of
theNationalElectricalCode. Donotusethegroundlug
forconnectinganeutralconductor.
• Connectpowerwiringtothecompressorcontactorclos-
esttotheentrancelocatedwithinthemaincontrolboxor
toelectricalpower block, if equipped.
LOW VOLTAGE
BLOCK
MAIN POWER
LOW VOLTAGE
ENTRANCE POWER THRU
THE CURB
Power and Low Voltage Block Connections
F AILURE OF UNIT DUE TO OPERATION ON IMPROPER LINE VOLTAGE
OR WITH EXCESSIVE PHASE UNBALANCE CONSTITUTES PRODUCT
ABUSE AND MAY CAUSE SEVERE DAMAGE TO THE UNIT ELECTRICAL
COMPONENTS .
WARNING

PRODUCT DESIGN
10
AREAS WITHOUTCONVENIENCE OUTLET
Itisrecommendedthatanindependent115Vpowersource
bebroughttothevicinityoftherooftopunitforportablelights
and tools used by the service mechanic.
NOTE:Refertolocalcodesforrequirements.Theseoutlets
can also be factory installed.
UNITS INSTALLED ON ROOF TOPS
Mainpowerandlowvoltagewiringmayentertheunitthrough
the condenser end of unit or through the roof curb. Install
conduitconnectorsatthedesiredentrancelocations. Exter-
nal connectors must be weatherproof. All holes in the unit
basemustbesealed(includingthosearoundconduitnuts)to
preventwaterleakageintobuilding. Allrequiredconduitand
fittings are to be field supplied.
Supply voltage to roof top unit must not vary by more than
10% of the value indicated on the unit data plate. Phase
voltageunbalancemustnotexceed2%. Contactyourlocal
powercompanyforcorrectionofimpropervoltageorphase
unbalance.
HIGH VOLTAGE ENTRANCE
LOW VOLTAGE ENTRANCE
1:4
30 1/4”*
12 3/8”
(REMOVE PLUG)
* (6 Ton - 34 1/4”)
41/2”
47 1/2” 7 1/2”
POWER THRU
THE CURB
3.5 DIA.
Electrical Entrance and Thru Curb
UnitisequippedwithaLowVoltageTerminalBlockandhas
Single Point wiring to the contactor or power block, if
equipped.
LOW VOLTAGE CONTROL WIRING
1. A24Vthermostatmustbeinstalled forunitoperation.It
maybepurchasedwiththeunitorfield-supplied. Ther-
mostatsmaybeprogrammableorelectromechanicalas
required.
2. Locate thermostat or remote sensor in the conditioned
space where it will sense average temperature. Do not
locate the device where it may be directly exposed to
supply air, sunlight or other sources of heat. Follow
installation instructions packaged with the thermostat.
3. Use #18 AWG wire for 24V control wiring runs not
exceeding 75 feet. Use #16 AWG wire for 24V control
wiringrunsnotexceeding125 feet. Use #14 AWG wire
for24Vcontrolwiringrunsnotexceeding200feet.Low
voltage wiring may be National Electrical Code (NEC)
Class 2 where permitted by local codes.
4. Route thermostat wires from sub-base terminals to the
unit.Controlwiringshouldenterthroughthecondenser
panel opening or through curb indicated in “Electrical
Entrance”figure.Connectthermostatandanyaccessory
wiring to low voltage terminal block TB1 in the main
control box.
NOTE: Field-suppliedconduitmay need to beinstalled
dependingonunit/curbconfiguration.Use#18AWG solid
conductorwirewheneverconnectingthermostatwiresto
terminalsonsub-base. DO NOT uselargerthan #18 AWG
wire. A transition to #18 AWG wire may be required before
enteringthermostatsub-base.
NOTE: Refer to unit wiring diagrams for thermostat
hookups.

SYSTEM OPERATION
11
TypicalPackageCoolingorPackageGas
RestrictorOrificeAssemblyinCoolingOperation
Inthecoolingmodetheorificeispushedintoitsseatforcingrefrigeranttoflowthroughthemeteredholeinthecenterofthe
orifice.
DCC***XXX**XXX

SYSTEM OPERATION
12
Typical Heat Pump System in Cooling
Indoor
Coil
Accumulator
Outdoor
Coil
Reversing Valve
(Energized)
Indoor
Coil
Accumulator
Outdoor
Coil
Reversing Valve
(De-Energized)
DCH***XXX**XXX

SYSTEM OPERATION
13
CIRCULATING AIR AND FILTERS
DUCTWORK
Thesupplyductfromtheunitthroughawallmaybeinstalled
withoutclearance.However,minimumunitclearancesmust
bemaintained(see“Clearances”section). Thesupplyduct
should be provided with an access panel large enough to
inspecttheairchamberdownstreamoftheheatexchanger.
A cover should be tightly attached to prevent air leaks.
Ductworkdimensionsareshownintheroofcurbinstallation
manual.
Ifdesired,supplyandreturnductconnectionstotheunitmay
be made with flexible connections to reduce possible unit
operatingsoundtransmission.
VENTING
NOTE: Venting is self-contained.
CONDENSATE DRAIN CONNECTION
CONDENSATE DRAIN CONNECTION
A3/4”femaleNPTdrainconnectionissuppliedontheendof
theunitandbottomofthedrainpanforcondensatepiping. An
externaltrapmustbeinstalledforpropercondensatedrain-
age.
DRAIN
CONNECTION
UNIT 2" MINIMUM
FLEXIBLE
TUBING-HOSE
OR PIPE 3" MINIMUM
A POSITIVE LIQUID
SEAL IS REQUIRED
Drain Connection
Install condensate drain trap as shown. Use 3/4" drain line
andfittingsor larger. Donotoperate without trap.
HORIZONTALDRAIN
Drainageofcondensatedirectlyontotheroofmaybeaccept-
able;refertolocalcode.Itisrecommendedthatasmalldrip
pad of either stone, mortar, wood or metal be provided to
preventanypossible damagetotheroof.
CLEANING
Duetothefactthatdrainpansinanyairconditioningunitwill
havesomemoistureinthem,algaeandfunguswillgrowdue
toairbornebacteriaandspores.Periodiccleaningisneces-
sarytopreventthis build-upfrompluggingthe drain.
STARTUP, ADJUSTMENTS, AND CHECKS
HIGH VOLTAGE!
OND THE FRAME OF THIS UNIT TO
THE BUILDING ELECTRICAL GROUND BY USE OF THE
GROUNDING TERMINAL PROVIDED OR OTHER
ACCEPTABLE MEANS . D ISCONNECT ALL POWER BEFORE
SERVICING OR INSTALLING THIS UNIT .
T
O AVOID PERSONAL INJURY OR DEATH DUE TO
ELECTRICAL SHOCK , B
WARNING
T O PREVENT PROPERTY DAMAGE OR PERSONAL INJURY , D O NOT
START THE UNIT UNTIL ALL NECESSARY PRE - CHECKS AND TESTS
HAVE BEEN PERFORMED .
CAUTION
MOVING MACHINERY HAZARD!
T
O PREVENT POSSIBLE PERSONAL INJURY OR DEATH , DISCONNECT
POWER TO THE UNIT AND PADLOCK IN THE “OFF” POSITION BEFORE
SERVICNG FANS .
WARNING
CONTRACTORRESPONSIBILITY
The installing contractor must be certain that:
• Allsupplyandreturnairductworkisinplace,properly
sealed,andcorrespondswithinstallationinstructions.
• Allthermostatsaremountedandwiredinaccordance
with installation instructions.
• All electric power, all gas, hot water or steam line
connections, and the condensate drain installation
have been made to each unit on the job. These main
supplylinesmustbefunctionalandcapableofoperat-
ing all units simultaneously.
• Requirementsaremetforventingandcombustionair.
• Air filters are in place.
• Inputrateandtemperatureriseareadjustedperrating
plate.
• Return air temperature is maintained between 55°F
(13°C)and80°F(27°C).
ROOF CURBINSTALLATION CHECK
Inspecttheroofcurbforcorrectinstallation.Theunitandcurb
assembly should be level. Inspect the flashing of the roof
mountingcurbtotheroof,especiallyatthecorners,forgood
workmanship. Also check for leaks around gaskets. Note
any deficiencies in a separate report and forward to the
contractor.

SYSTEM OPERATION
14
OBSTRUCTIONS,FAN CLEARANCE ANDWIRING
Removeanyextraneousconstructionandshippingmaterials
that may be found during this procedure. Rotate all fans
manuallytocheckforproperclearancesandthattheyrotate
freely.Checkforboltsandscrewsthatmayhavejarredloose
during shipment to the job site. Retighten if necessary. Re-
tighten all electrical connections.
FIELDDUCTCONNECTIONS
Verifythat allduct connectionsaretight andthat thereis no
airbypass betweensupply andreturn.
FILTER SECTION CHECK
Removefiltersectionaccesspanelsandcheckthatfiltersare
properlyinstalled.Noteairflowarrowsonfilterframes.
AIR FLOW ADJUSTMENTS
Whenthefinaladjustmentsarecomplete,thecurrentdrawof
the motor should be checked and compared to the full load
currentratingofthemotor.Theamperage mustnot exceed
theservicefactorstampedonthemotornameplate. Thetotal
airflowmustnotbelessthanthatrequiredforoperationofthe
electricheaters or thefurnace.
If an economizer is installed, check the unit operating
balance with the economizer at full outside air and at
minimumoutside air.
NOTE: Airflowsetting below 350CFM/Tonis not
recommended,as evaporatorfreezingorpoorunit
performanceispossible.
PSC MOTOR
AdjusttheCFMfortheunitbychangingthespeedtapofthe
indoor blower motor at the heat or cool tap on the control
boardconnectionwiththeoneof the speed taps on “M1” or
“M2” (Black-High Speed, Blue-Medium Speed, Red-Low
Speed).
EEMMotor
AdjusttheCFMfortheunitbychangingthepositionofthelow
voltage leads on the motor terminal block. Green is for Fan
Only.YellowisforCoolingandHeatPumpHeating.NOTE:If
more than one lead is energized simultaneously, the motor
will run at the higher speed.
SET EVAPORATOR FAN RPM
ActualRPM’s mustbe setandverified witha tachometeror
strobe light. Refer to Appendices A and B for basic unit fan
RPM. Refer also to “Airflow” section of this manual. With
disconnect switch open, disconnect thermostat wires from
terminalsYandW.Thiswillpreventheatingandmechanical
coolingfromcomingon.Placeajumperwireacrossterminals
R and G at TB1 terminal block. Close disconnect switch;
evaporatorfan motor willoperateso RPM canbe checked.
For gas heat units, the airflow must be adjusted so that the
air temperature rise falls within the ranges given stated on
Data Plate.
EVAPORATOR FAN ROTATION CHECK (THREE PHASE MODELS
ONLY)
Checkthatfanrotatesclockwisewhenviewedfromthedrive
sideofunitandin accordancewith rotationarrowshownon
blowerhousing.Ifitdoesnot,reverseanytwoincomingpower
cables at Single Point Power Block. In this case, repeat
bearingcheck.
Do not attempt to change load side wiring. Internal wiring
assures all motors and compressors will rotate in correct
directiononceevaporatorfanmotorrotationcheckhasbeen
made.
ELECTRICALINPUTCHECK
Makepreliminarycheckofevaporatorfanamperedrawand
verifythatmotornameplateampsarenotexceeded.Afinal
check of amp draw should be made upon completion of air
balancing of the duct system.
BELT DRIVE MODELS ONLY
Thedriveonthesupplyfanistypicallysetinthemiddleofthe
RPM range. The drive motor sheave pitch diameter is field
adjustablefortherequiredairflow.
Upon completion of the air flow balancing, we recommend
replacingthevariablepitchedmotorsheavewithaproperly-
sized fixed sheave. A matching fixed sheave will provide
longer belt and bearing life and vibration free operation.
Initially,itisbesttohaveavariablepitchedmotorsheavefor
the purpose of airflow balancing, but once the balance has
beenachieved,fixedsheavesmaintainalignmentandmini-
mizevibrationmoreeffectively.Fordirectdriveunits,movefan
speedwire.
BEARING CHECK
Prior to energizing any fans, check and make sure that all
setscrewsaretightsothatbearingsareproperlysecuredto
shafts.
NORMAL SEQUENCE OF OPERATION
COOLING
Begin with power turned off at all disconnects.
1. Turnthermostatsystemswitchto“Cool,”andfanswitch
to“Auto”andturntemperaturesettingashighasitwillgo.
2. Inspect all registers and set them to the normal open
position.
3. Turn on the electrical supply at the disconnect.
4. Turn the fan switch to the “ON” position. The blower
shouldoperate after a 7seconddelay.
5. Turnthefanswitchto“Auto”position.Theblowershould
stop after a 65 second delay.

SYSTEM OPERATION
15
6. Slowlylowerthecoolingtemperatureuntiltheunitstarts.
Thecompressor,blowerandfanshouldnowbeoperat-
ing.Allowtheunittorun10 minutes,make surecool air
is being supplied by the unit.
7. Turn the temperature setting to the highest position,
stoppingtheunit.Theindoorblowerwillcontinuetorun
for65 seconds.
8. Turnthethermostatsystemswitchto“OFF”anddiscon-
nectall powerwhen servicingtheunit.
HIGH VOLTAGE!
D
ISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT . M ULTIPLE POWER SOURCES MAY
BE PRESENT . F AILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE , PERSONAL INJURY OR DEATH .
WARNING
HEAT PUMP
9. Check the cooling mode for the heat pump in the same
mannerasabove.Thereversingvalveisenergizedwhen
the thermostat is placed in the cooling position. A
clicking sound should be noticeable from the reversing
valve. By lowering the temperature setting to call for
cooling, the contractor is energized. The compressor,
blowerandfanshouldthenberunning. Afterthecooling
modeischeckedout,turnthethermostatsystemswitch
to “OFF”.
10. Turn the thermostat system switch to “HEAT” and fan
switch to “AUTO”.
11. Slowlyraisetheheatingtemperaturesetting.Whenthe
heating first stage makes contact, stop raising the
temperature setting.. The compressor, blower and fan
shouldnowberunningwiththereversingvalveinthede-
energized(heating)position.Aftergivingtheunittimeto
settle out, make sure the unit is supplying heated air.
12. Iftheoutdoorambientisabove80°F,theunitmaytripon
itshighpressurecutoutwhenonheating.Thecompres-
sor should stop. The heating cycle must be thoroughly
checked, so postpone the test to another day when
conditionsaremoresuitablebut-DONOTFAILTOTEST.
If the outdoor ambient is low and the unit operates
properly on the heating cycle, you may check the
pressure cutout operation by blocking off the indoor
return air until the unit trips.
13. If unit operates properly in the heating cycle, raise the
temperaturesettinguntiltheheatingsecondstagemakes
contact.Supplementalresistanceheat,ifinstalledshould
now come on. Make sure it operates properly.
NOTE: Ifoutdoorthermostatsareinstalledtheoutdoor
ambient must be below the set point of these thermo-
stats for the heaters to operate. It may be necessary to
jumper these thermostats to check heater operation if
outdoorambientis mild.
14. For thermostats with emergency heat switch, return to
step 11. The emergency heat switch is located at the
bottomofthethermostat.Movetheswitchtoemergency
heat.Theheatpumpwillstop,theblowerwillcontinueto
run, all heaters will come on and the thermostat emer-
gency heat light will come on.
15. If checking the unit in the wintertime, when the outdoor
coiliscoldenoughtoactuatethedefrostcontrol,observe
atleastonedefrostcycletomakesuretheunitdefrosts
completely.
HEAT PUMP OPERATION
COOLING CYCLE
When the heat pump is in the cooling cycle, it operates
exactlyasaSummerAirConditionerunit.Inthismode,allthe
chartsanddataforservicethatapplytosummeraircondition-
ingapplytotheheatpump.Mostapplyontheheatingcycle
exceptthat“condenser”becomes“evaporator”,“evaporator”
becomes“condenser”,“cooling”becomes“heating”.
HEATING CYCLE
The heat pump operates in the heating cycle by redirecting
refrigerantflowthroughtherefrigerantcircuitexternaltothe
compressor.Thisisaccomplishedwiththroughthereversing
valve.Hotdischargevaporfromthecompressorisdirectedto
the indoor coil (evaporator on the cooling cycle) where the
heatisremoved, and thevaporcondenses to liquid. Itthen
goes through the expansion device to the outdoor coil
(condenser on the cooling cycle) where the liquid is evapo-
rated,andthe vapor goes tothecompressor.
Whenthesolenoidvalvecoilisoperatedeitherfromheating
tocoolingorviceversa,thepistoninthereversingvalvetothe
lowpressure(highpressure)reversepositionsintherevers-
ingvalve.
Thefollowingfiguresshowaschematicofaheatpumponthe
coolingcycleandtheheatingcycle. Inadditiontoareversing
valve,aheatpumpisequippedwithanexpansiondeviceand
checkvalvefortheindoorcoil,andsimilarequipmentforthe
outdoorcoil.Itisalsoprovidedwithadefrostcontrolsystem.
Theexpansiondevicesareflowratordistributorsandperform
the same function on the heating cycle as on the cooling
cycle. Theflowratordistributors alsoactas checkvalvesto
allowforthereverseofrefrigerantflow.

SYSTEM OPERATION
16
Whentheheatpumpisontheheatingcycle,theoutdoorcoil
is functioning as an evaporator. The temperature of the
refrigerantintheoutdoorcoilmustbebelowthetemperature
oftheoutdoorairin ordertoextractheatfrom theair. Thus,
thegreaterthedifferenceintheoutdoortemperatureandthe
outdoorcoiltemperature,thegreatertheheatingcapacityof
theheatpump. Thisphenomenonisacharacteristicofaheat
pump. Itisagoodpracticetoprovidesupplementaryheatfor
all heat pump installations in areas where the temperature
drops below 45° F. It is also a good practice to provide
sufficient supplementary heat to handle the entire heating
requirementshouldtherebeacomponentfailureoftheheat
pump, such as a compressor, or refrigerant leak, etc.
Sincethetemperatureoftherefrigerantintheoutdoorcoilon
theheatingcycleisgenerallybelowfreezingpoint,frostforms
on the surfaces of the outdoor coil under certain weather
conditionsof temperatureandrelativehumidity.Therefore,it
isnecessarytoreversetheflowoftherefrigeranttoprovidehot
gasintheoutdoorcoiltomeltthefrostaccumulation.Thisis
accomplished by reversing the heat pump to the cooling
cycle.Atthesametime, theoutdoor fanstopstohastenthe
temperature rise of the outdoor coil and lessen the time
requiredfordefrosting.Theindoorblowercontinuestorunand
thesupplementaryheatersareenergized.
DEFROST CONTROL
Duringoperationthepowertothecircuit boardis controlled
byatemperaturesensor,whichisclampedto afeedertube
enteringtheoutdoorcoil.Defrosttimingperiodsof30,60and
90minutesmaybeselectedbyconnectingthecircuitboard
jumper to 30, 60 and 90 respectively. Accumulation of time
forthetimingperiodselectedstartswhenthesensorcloses
(approximately31°F),andwhenthewallthermostatcallsfor
heat. Attheendofthetimingperiod,theunit’sdefrostcycle
will be initiated provided the sensor remains closed. When
thesensoropens(approximately75°F),thedefrostcycleis
terminatedandthetimingperiodisreset.Ifthedefrostcycle
isnotterminatedduetothesensortemperature,atenminute
overrideinterruptstheunit’sdefrostperiod.
REFRIGERATION SYSTEM CHECKS
Ensure the hold-down bolts on the compressor are secure
and have not vibrated loose during shipment. Check that
vibration grommets have been installed. Visually check all
pipingandclamps.Theentirerefrigerationsystemhasbeen
factory charged and tested, making it unnecessary to field
charge. Factory charges are shown on the unit nameplate.
FINAL SYSTEM CHECKS
1. Check to see if all supply and return air grilles are
adjusted and the air distribution system is balanced for
thebest compromisebetween heatingand cooling.
2. Checkforairleaksintheductwork. SeeSectionsonAir
FlowAdjustments.
3. Makesuretheunitisfreeof“rattles”,andthetubinginthe
unit is free from excessive vibration. Also make sure
tubesorlinesarenotrubbingagainsteachotherorsheet
metal surfaces or edges. If so, correct the trouble.
4. Setthethermostatattheappropriatesettingforcooling
andheatingorautomaticchangeoverfornormaluse.
5. Be sure the Owner is instructed on the unit operation,
filter,servicing,correctthermostatoperation, etc.

SCHEDULED MAINTENANCE
17
MAINTENANCE
HIGH VOLTAGE!
D
ISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT . M ULTIPLE POWER SOURCES MAY
BE PRESENT . F AILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE , PERSONAL INJURY OR DEATH .
WARNING
T O PREVENT PERSONAL INJURY OR DEATH DUE TO IMPROPER
INSTALLATION , ADJUSTMENT , ALTERATION , SERVICE OR
MAINTENANCE , REFER TO THIS MANUAL . F OR ADDITIONAL
ASSISTANCE OR INFORMATION , CONSULT A QUALIFIED INSTALLER ,
SERVICE AGENCY OR THE GAS SUPPLIER .
WARNING
S HEET METAL PARTS , SCREWS , CLIPS AND SIMILAR ITEMS INHERENTLY
HAVE SHARP EDGES , AND IT IS NECESSARY THAT THE INSTALLER AND
SERVICE PERSONNEL EXERCISE CAUTION .
CAUTION
Preventivemaintenanceisthebestwaytoavoidunnecessary
expenseandinconvenience.Havethissysteminspectedat
regularintervalsbyqualifiedservicepersonnel,atleasttwice
a year. Routine maintenance should cover the following
items:
1. Tighten all belts, set screws, and wire connections.
2. Cleanevaporator and condenser coils mechanically or
withcoldwater,ifnecessary.Usuallyanyfoulingisonly
matted on the entering air face of the coil and can be
removedbybrushing.
3. Lubricatemotorbearings.
4. Align or replace belts as needed.
5. Replacefiltersasneeded(seebelow).
6. Checkforblockageofcondensatedrain.
7. Checkpowerandcontrolvoltages.
8. Checkrunningamperage.
9. Checkoperatingtemperaturesandpressures.
10. Checkandadjusttemperatureand pressurecontrols.
11. Checkand adjustdamperlinkages.
12. Checkoperation ofallsafetycontrols.
13. Examinegasfurnaces (seebelow andtheUser’sInfor-
mationManual).
14. Check condenser fans and tighten set screws.
FILTERS
CAUTION
TO PREVENT PROPERTY DAMAGE DUE TO FIRE AND LOSS OF
EQUIPMENT EFFICIENCY OR EQUIPMENT DAMAGE DUE TO DUSTANDLINT
BUILD UP ON INTERNAL PARTS, NEVER OPERATE UNIT WITHOUT AN AIR
FILTER INSTALLED IN THE RETURN AIR SYSTEM.
Everyapplicationmayrequireadifferentfrequencyofreplace-
ment of dirty filters. Filters must be replaced at least every
three(3)monthsduringoperatingseasons.
Dirty filters are the most common cause of inadequate
heatingor cooling performance.Filterinspection should be
made at least every two months; more often if necessary
becauseoflocal conditions and usage.
Dirtythrowawayfiltersshouldbediscardedandreplacedwith
a new, clean filter.
Disposablereturnairfiltersaresuppliedwiththisunit.Seethe
unitSpecificationSheetorthecorrectsizeandpartnumber.
Toremovethefilters,removethefilteraccesspanelonreturn
side of the unit.
CABINETFINISH MAINTENANCE
Use a fine grade automotive wax on the cabinet finish to
maintain the finish’s original high luster. This is especially
important in installations with extended periods of direct
sunlight.
CLEAN OUTSIDE COIL (QUALIFIED SERVICER ONLY)
Thecoilwiththeoutsideairflowingoveritshouldbeinspected
annuallyandcleanedasfrequentlyasnecessarytokeepthe
finnedareas freeoflint, hairand debris.
CONDENSER AND INDUCED DRAFT MOTORS
Bearings on the condenser fan motors and the combustion
fanmotorarepermanentlylubricated.Noadditionaloilingis
required.
LUBRICATION
Thefanshaftbearings,the1to2 HPsupplyfanmotors,the
condenser fan motors and compressors are permanently
lubricated.
FUNCTIONALPARTS
Refer to the unit Parts Catalog for a list of functional parts.
Partsareavailablefromyourdistributor.

18
SERVICING
Complaint System Operating
Pressures
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
SYMPTOM
System will not start Compressor will not start - fan runs Comp.and Cond. Fanwillnot start Evaporator fan will not start Condenser fan will not start Compressor runs - goes off on overload Compressor cycles on overload System runs continuously - little cooling Too cool and then too warm Not cool enough on warm days Certain areas too cool,others too warm Compressorisnoisy Low suction pressure High suction pressure High head pressure
Test Method
Remedy
See Service Procedure Ref.
Power Failure •Test Voltage S-1
Blown Fuse ••• Inspect Fuse Size & Type S-1
Unbalanced Power, 3PH ••• Test Voltage S-1
Loose Connection ••• Inspect Connection - Tighten S-2,S-3
Shorted or Broken Wires •••••• TestCircuitsWithOhmmeter S-2,S-3
Open Fan Overload •• TestContinuityof Overload S-17A
Faulty Thermostat ••• • TestContinuityof Thermostat & Wiring S-3
Faulty Transformer •• Check Control Circuit with Voltmeter S-4
Shorted or Open Capacitor ••••• TestCapacitor S-15
Internal Compressor Overload Open •TestContinuityof Overload S-17A
Shorted or Grounded Compressor •• Test Motor Windings S-17B
Compressor Stuck ••• Use Test Cord S-17D
Faulty Compressor Contactor ••• Test Continuity of Coil & Contacts S-7, S-8
Faulty Fan Relay •Test Continuity of Coil And Contacts S-7
OpenControl Circuit •Test Control Circuit with Voltmeter S-4
Low Voltage ••• Test Voltage S-1
Faulty Evap. Fan Motor ••
Repair or Replace S-16
Shorted or Grounded Fan Motor ••
Test Motor Windings S-16
Improper Cooling Anticipator •• Check Resistance of Anticipator S-3B
Shortage of Refrigerant •• • TestFor Leaks, AddRefrigerant S-101,103
Restricted Liquid Line •• • •
Remove Restriction, Replace Restricted Part S-112
Dirty Air Filter •••• Inspect Filter-Clean or Replace
Dirty Indoor Coil •••• Inspect Coil - Clean
Insufficient air across Indoor Coil ••••
C
heck Blower
S
peed and Rotation, Belt,Pulleys
,
Duct Static Filter
S
-
200
,
20
5,
206 207
Too much air across Indoor Coil •Reduce Blower Speed, Check Pulley Adjustment S-205, 207
Overcharge of Refrigerant •• • ••
Recover Part of Charge S-113
Dirty Outdoor Coil ••• • •
Inspect Coil - Clean
Noncondensibles •• • •
Recover Charge, Evacuate, Recharge S-114
Recirculation of Condensing Air •• • •
Remove Obstruction to Air Flow
Infiltration of Outdoor Air •••
Check Windows, Doors,Vent Fans, Etc.
Improperly Located Thermostat •• Relocate Thermostat
Air Flow Unbalanced ••
Readjust Air Volume Dampers
System Undersized •• Refigure Cooling Load
Broken Internal Parts •Replace Compressor S-115
Broken Valves •••
Test Compressor Efficiency S-104
Inefficient Compressor ••
Test Compressor Efficiency S-104
Expansion DeviceRestricted ••• • • •
Remove Restriction, Replace Expansion Device 111
Loose Hold-down Bolts •Tighten Bolts
Flowrator Not Seating Properly ••
Check Flowrator & Seat or Replace Flowrator S-111
•
No Cooling
Cooling Cycle
COOLING ANALYSIS CHART
Unsatisfactory
Cooling

SERVICING
19
Table of Contents
HIGH VOLTAGE!
Disconnect ALL power before servicing or installing this unit. Multiple power sources
may be present. Failure to do so may cause property damage, personal injury or death.
S-1 CheckingVoltage.......................................... 20
S-2 CheckingWiring............................................ 21
S-3 Checking Thermostat,Wiring & Anticipator .. 21
S-3A Thermostat&Wiring ..................................... 21
S-3B CoolingAnticipator........................................ 21
S-4 Checking Transformer&ControlCircuit ....... 21
S-7 CheckingContactorand/orRelays................ 22
S-8 CheckingContactorContacts ....................... 22
S-9 CheckingFanRelayContact ........................ 23
S-11 CheckingLossofChargeProtection ............. 24
S-12 CheckingHighPressureControl ................... 24
S-13 CheckingLowPressureControl .................... 24
S-15 Checking Capacitor ......................................25
S-15A ResistanceCheck......................................... 25
S-15B Capacitance Check ...................................... 25
S-16 CheckingMotors........................................... 26
S-16A Checking Fan & Blower Motor
Windings (PSC Motors) ............................... 26
S-16D Checking EEM Motors .................................. 26
S-17 Checking Compressor Windings .................. 27
S-17A ResistanceTest ............................................27
S-17B GroundTest ..................................................27
S-17D OperationTest .............................................. 28
S-18 TestingCrankcaseHeater(optionalitem) ..... 28
S-18A CrankcaseHeaterThermostat ......................28
S-21 Checking ReversingValve &Solenoid .......... 28
S-24 TestingDefrostControl .................................29
S-25 TestingDefrostThermostat ........................... 29
S-50 Checking Heater Limit Control(s)..................30
S-100 Refrigeration Repair Practice .......................30
S-101 LeakTesting ................................................. 30
S-102 Evacuation .................................................... 31
S-103 Charging.......................................................32
S-104 Checking Compressor Efficiency ................. 33
S-106 Overfeeding .................................................. 33
S-108 CheckingSuperheat ..................................... 33
S-111 Fixed Orifice Restriction Devices..................36
S-112 Checking Restricted Liquid Line ................... 36
S-113 RefrigerantOvercharge ................................ 36
S-114 Non-condensables ........................................ 36
S-115 CompressorBurnout..................................... 36
S-200 Checking External Static Pressure ...............37
S-201 CheckingTemperatureRise ......................... 39
S-205 Checking BeltTension .................................. 38
S-206 Indoor Fan Rotation Check........................... 39
S-207 MotorSheaveAdjustment ............................. 39

SERVICING
20
S-1 CHECKING VOLTAGE
HIGH VOLTAGE!
Disconnect ALL power before servicing
or installing this unit. Multiple power
sources may be present. Failure to do so
may cause property damage, personal injury
or death.
1. Removedoors,controlpanel cover,etc.from unitbeing
tested.
WithpowerON:
WARNING
Line Voltage now present.
2. Usingavoltmeter,measurethevoltageacrossterminals
L1andL2ofthecontactorforsinglephaseunits,andL3,
for 3 phase units.
3. Noreading-indicatesopenwiring,openfuse(s)nopower
or etc. from unit to fused disconnect service. Repair as
needed.
4. Withamplevoltageatlinevoltageconnectors,energize
the unit.
5. Measurethevoltagewiththeunitstartingandoperating,
anddeterminetheunit LockedRotorVoltage.
LockedRotorVoltageistheactualvoltageavailableat
thecompressorduringstarting,lockedrotor,orastalled
condition. Measuredvoltageshouldbeaboveminimum
listed in chart below.
TomeasureLocked RotorVoltageattachavoltmeterto
therun"R"andcommon"C"terminalsofthecompressor,
ortotheT1andT2terminalsofthecontactor.Starttheunit
andallowthecompressortorunforseveralseconds,then
shut down the unit. Immediately attempt to restart the
unitwhile measuring the LockedRotor Voltage.
6. Voltmeter should read within the voltage tabulation as
shown. If the voltage falls below the minimum voltage,
checkthelinewiresize. Longrunsofundersizedwirecan
causelowvoltage. Ifwiresizeisadequate,notifythelocal
powercompany inregards toeitherloworhigh voltage.
Voltage Min. Max.
208/230 198 253
400 360 440
460 437 506
575 546 604
Unit Supply Voltage
Threephaseunitsrequireabalanced3phasepowersupply
tooperate. Ifthepercentageofvoltageimbalanceexceeds
3%theunit mustnotbeoperateduntilthevoltagecondition
is corrected. Max. Voltage Deviation
% Voltage = From Average Voltage X 100
Imbalance Average Voltage
Tofindthepercentageofimbalance,measuretheincoming
powersupply.
L1 - L2 = 240V
L1 - L3 = 232V Avg. V = 710 = 236.7
L2 - L3 = 238V 3
Total 710V
TofindMax.deviation: 240 - 236.7 = +3.3
232 - 236.7 = -4.7
238 - 236.7 = +1.3
Maxdeviationwas4.7V
% Voltage Imbalance = 4.7 =1.99%
236.7
Ifthepercentageofimbalancehadexceeded3%,itmustbe
determinediftheimbalanceisintheincomingpowersupply
orthe equipment. Todo thisrotate thelegs ofthe incoming
powerandretestvoltageasshownbelow.
L1 L2 L3
L3L2
L1
L1 - L2 = 240V
L1 - L3 = 227V
L2 - L3 = 238V
Rotate all 3 incoming
legs as shown.
L1 - L2 = 227V
L1 - L3 = 238V
L2 - L3 = 240V
Bythevoltagereadingsweseethattheimbalancerotatedor
traveledwiththeswitchingoftheincominglegs. Thereforethe
imbalance lies within the incoming power supply.
Iftheimbalancehadnotchangedthentheproblemwouldlie
within the equipment. Check for current leakage, shorted
motors, etc.