Daikin DDC Series Manual

Installation and Maintenance Manual IM 1216
Group: Applied Air Systems
Part Number: IM 1216
Date: January 2014
Light Commercial Packaged Heating and Cooling Units
DCC Series
15–20 Tons

WARNING
ATTENTION INSTALLING PERSONNEL:
Prior to installation, thoroughly familiarize yourself with this
Installation Manual. Observe all safety warnings. During
installation or repair, caution is to be observed. It is your
responsibility to install the product safely and to educate the
customer on its safe use.
RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION.
These installation instructions cover the outdoor installation of single package heating and cooling units. See the Specication
Sheet applicable to your model for information regarding accessories.
NOTE: Please contact your distributor or our website for the applicable Specication Sheet referred to in this manual.
This Forced Air Central Unit Design Complies With Requirements Embodied In The American National Standard / National
Standard of Canada Shown Below.
ANSI Z21.47 • CSA-2.3 Central Furnaces
Our continuing commitment to quality products may mean a change in specications without notice.
©2013 Daikin Company, L.P.
5151 San Felipe St., Suite 500, Houston, TX 77056
www.daikincomfort.com

Index
Replacement Parts ............................2
Safety Instructions ............................2
General Information ...........................2
Unit Location.................................3
Clearances ..................................5
Roof Curb Post-Installation Checks ..............6
Roof Top Duct Connections ....................6
Rigging Details ...............................6
Electrical Wiring ..............................7
Circulating Air and Filters ......................9
Condensate Drain Connection ..................9
Startup, Adjustments, and Checks ...............9
Airow Adjustments..........................10
Motor Sheave Adjustments ....................11
Maintenance ................................13
Appendix A Blower Performance Data...........14
Belt Drive - Standard .........................14
Appendix B Electrical Data ....................15
Appendix C Unit Dimensions ..................16

2
T HIS PRODUCT CONTAINS OR PRODUCES A CHEMICAL OR CHEMICALS
WHICH MAY CAUSE SERIOUS ILLNESS OR DEATH AND WHICH ARE
KNOWN TO THE S TATE OF C ALIFORNIA TO CAUSE CANCER , BIRTH
DEFECTS OR OTHER REPRODUCTIVE HARM .
WARNING
REPLACEMENTPARTS
ORDERING PARTS
When reporting shortages or damages, or ordering repair
parts, give the complete unit model and serial numbers as
stamped on the unit’s nameplate.
Replacement parts for this appliance are available through
your contractor or local distributor. For the location of your
nearest distributor, consult the white business pages, the
yellow page section of the local telephone book or contact:
CONSUMER AFFAIRS
DAIKIN NORTH AMERICA LLC
7401 SECURITY WAY
HOUSTON, TEXAS 77040
855-770-5678
SAFETYINSTRUCTIONS
TOTHE INSTALLER
Before installing this unit, please read this manual to
familiarize yourself on the specific items which must be
adhered to, including maximum external static pressure to
unit, air temperature rise, minimum or maximum CFM and
motor speed connections.
Keep this literature in a safe place for future reference.
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
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
WARNING
TO PREVENT THE RISK OF PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH,
DO NOT STORE COMBUSTIBLE MATERIALS OR USE GASOLINE OR OTHER
FLAMMABLE LIQUIDS OR VAPORS IN THE VICINITY OF THIS APPLIANCE.
HIGH VOLTAGE!
I NSTALLATION AND REPAIR OF THIS UNIT SHOULD BE
PERFORMED ONLY BY INDIVIDUALS MEETING ( AT A
MINIMUM ) THE REQUIREMENTS OF AN “E NTRY L EVEL
T
ECHNICIAN ” AS SPECIFIED BY THE A IR C ONDITIONING ,
H
EATING , AND R EFRIGERATION I NSTITUTE (AHRI).
A
TTEMPTING TO INSTALL OR REPAIR THIS UNIT WITHOUT
SUCH BACKGROUND MAY RESULT IN PRODUCT DAMAGE ,
PERSONAL INJURY OR DEATH .
WARNING
GENERALINFORMATION
This unit is approved for outdoor installation ONLY. Ratedperfor-
manceisachievedafter72hoursofoperation.Ratedperformance
is delivered at the specified airflow. See outdoor unit specifica-
tion sheet for split system models or product specification sheet
for packaged and light commercial models. Specification sheets
can be found at www.daikincomfort.com for Daikin brand prod-
ucts. Within the website, please select the residential or com-
mercialproductsmenuandthenselect thesubmenuforthetype
ofproducttobeinstalled,suchasairconditionersorheatpumps,
to access a list of product pages that each contain links to that
model’s specification sheet.
To assure that your unit operates safely and efficiently, it must be
installed, operated, and maintained in accordance with these in-
stallation and operating instructions, all local building codes and
ordinances.

3
EPA REGULATIONS
IMPORTANT:THE UNITED STATES ENVIRONMENTAL PROTECTION AGENCY (EPA)
HAS ISSUED VARIOUS REGULATIONS REGARDING THE INTRODUCTION AND DISPOSAL
OF REFRIGERANTS IN THIS UNIT. FAILURE TO FOLLOW THESE REGULATIONS MAY
HARM THE ENVIRONMENT AND CAN LEAD TO THE IMPOSITION OF SUBSTANTIAL
FINES. BECAUSE REGULATIONS MAY VARY DUE TO PASSAGE OF NEW LAWS, WE
SUGGEST ACERTIFIED TECHNICIAN PERFORM ANY WORK DONE ON THIS UNIT.
SHOULD YOU HAVE ANY QUESTIONS PLEASE CONTACT THE LOCAL OFFICE OF THE
EPA.
NATIONAL CODES
This product is designed and manufactured to permit installation
inaccordancewithNationalCodes.Itis the installer’s responsibil-
ity to install the product in accordance with National Codes and/
or prevailing local codes and regulations.
The heating and cooling capacities of the unit should be greater
than or equal to the design heating and cooling loads of the area
to be conditioned. The loads should be calculated by an approved
method or in accordance with ASHRAE Guide or Manual J - Load
Calculations published by the Air Conditioning Contractors of
America.
Obtain from:
American National Standards Institute
1430 Broadway
New York, NY 10018
System design and installation should also, where applicable, fol-
lowinformationpresentedinacceptedindustryguidessuchasthe
ASHRAE Handbooks. The manufacturer assumes no responsibility
forequipment installedin violation of any code or regulation.The
mechanical installation of the packaged roof top units consists of
making final connections between the unit and building services;
supply and return duct connections; and drain connections (if re-
quired). The internal systems of the unit are completely factory-
installed and tested prior to shipment.
Unitsaregenerallyinstalledon asteelroofmountingcurb assem-
bly which has been shipped to the job site for installation on the
roof structure prior to the arrival of the unit. The model number
shownontheunit’sidentificationplateidentifiesthevariouscom-
ponents of the unit such as refrigeration tonnage, heating input
and voltage.
Carefully inspect the unit for damage. Any bolts or screws which
may have loosened in transit must be re-tightened. In the event
of damage, the receiver should:
1. Make notation on delivery receipt of any visible damage
to shipment or container.
2. Notify carrier promptly and request an inspection.
3. Incaseofconcealeddamage,carriershouldbenotifiedas
soon as possible-preferably within 5 days.
4. File the claim with the following supporting documents:
a. OriginalBill of Lading,certifiedcopy, or indemnitybond.
b. Original paid freight bill or indemnity in lieu thereof.
c. Original invoice or certified copy thereof, showing trade
and other discounts or reductions.
d. Copy of the inspection report issued by carrier
representative at the time damage is reported to the
carrier. The carrier is responsible for making prompt
inspection of damage and for a thorough investigation
of each claim. The distributor or manufacturer will not
accept claims from dealers for transportation damage.
NOTE: When inspecting the unit for transportation damage,
removeallpackagingmaterials.Recycleordispose ofthepackaging
material according to local codes.
PRE-INSTALLATION CHECKS
Carefully readallinstructionsfor the installationprior toinstalling
unit.Ensure eachsteporprocedureisunderstoodandanyspecial
considerations are taken into account before starting installation.
Assemblealltools,hardwareandsuppliesneededtocompletethe
installation. Some items may need to be purchased locally.
UNITLOCATION
T O PREVENT POSSIBLE EQUIPMENT DAMAGE , PROPERTY DAMAGE ,
PERSONAL INJURY OR DEATH , THE FOLLOWING BULLET POINTS MUST
BE OBSERVED WHEN INSTALLING THE UNIT .
WARNING
IMPORTANT NOTE: Remove wood shipping rails prior to installa-
tion of the unit. See important note under Roof Curb Installation
Only.
ALL INSTALLATIONS:
IMPORTANT NOTE: Unit should be energized 24 hours prior to
compressor start up to ensure crankcase heater has suffi-
ciently warmed the compressors. Compressor damage may
occur if this step is not followed.
NOTE: Appliance is shipped from factory for vertical duct
application.
Proper installation of the unit ensures trouble-free operation. Im-
proper installation can result in problems ranging from noisy
operation to property or equipment damages, dangerous condi-
tions that could result in injury or personal property damage and
could void the warranty. Give this booklet to the user and explain
it’sprovisions.Theusershould retaintheseinstructionsforfuture
reference.
•For proper operation and condensate drainage, the unit
must be mounted level.
•Theflueoutlethoodmustbeatleastthreefeetaboveany
forced air inlet located within ten feet. The economizer/
manual fresh air intake/motorized fresh air intake and
combustionairinletmountedontheunitarenotaffected
by this restriction.
•Do not locate the unit in an area where the outdoor air
(i.e. combustion air for the unit) will be frequently
contaminated by compounds containing chlorine or
fluorine. Common sources of such compounds include
swimming pool chemicals and chlorine bleaches, paint

4
stripper,adhesives,paints,varnishes,sealers,waxes(which
are not yet dried) and solvents used during construction
and remodeling. Various commercial and industrial
processes may also be sources of chlorine/fluorine
compounds.
•Toavoidpossibleillnessordeathofthebuildingoccupants,
do NOT locate outside air intake device (economizer,
manual fresh air intake, motorized fresh air intake) 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,properoperation,andserviceaccess(seeUnit
Clearances). These clearances must be permanently
maintained.
•When the unit is heating, the temperature of the return
air entering the unit must be between 50°F and 100°F.
GROUND LEVEL INSTALLATIONS ONLY:
•When the unit is installed on the ground adjacent to the
building,alevelconcrete(orequal)baseisrecommended.
Prepare a base that is 3” larger than the package unit
footprint and a minimum of 3” thick.
•Thebaseshouldalsobelocated wherenorunoffofwater
from higher ground can collect in the unit.
ROOF TOP INSTALLATIONS ONLY:
•Toavoid possibleproperty damage or personalinjury, the
roof must have sufficient structural strength to carry the
weight of the unit(s) and snow or water loads as required
bylocalcodes. Consultastructuralengineertodetermine
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.
•To avoid possible personal injury, a safe, flat surface for
service personnel should be provided.
•Asindicatedontheunit’sdataplate,aminimumclearance
of 36” to any combustible material is required on the
accesssideoftheunit. Allcombustiblematerialsmustbe
kept out of this area.
•This 36” clearance must also be maintained to insure
proper combustion air flow. The combustion air intake
mustnotbeblockedforanyreason,includingblockageby
snow.
•Adequate clearances from the unit to any adjacent public
walkways, adjacent buildings, building openings or
openablewindowsmustbemaintainedinaccordancewith
National Codes.
UNIT PRECAUTIONS
• Do not stand or walk on the unit.
• Donotdrillholesanywhereinpanelsorinthebaseframe
of the unit (except where indicated). Unit access panels
provide structural support.
• Do not remove any access panels until unit has been
installed on roof curb or field supplied structure.
• Donotrollunitacrossfinishedroofwithoutpriorapproval
of owner or architect.
• Do not skid or slide on any surface as this may damage
unitbase. Theunitmustbestoredonaflat,levelsurface.
Protect the condenser coil because it is easily damaged.
ROOF CURB INSTALLATIONS ONLY:
Before installing this unit...
IMPORTANT NOTE: This unit has been equipped with a shipping
braceunder the compressorsection that MUST BE REMOVED be-
fore installing the unit on a roof curb.
Please follow the instructions below to remove brace.
W HEN UNIT IS SUSPENDED , BOARDS AND SHIPPING BRACE WILL DROP WHEN
SCREWS ARE REMOVED . T O PREVENT PERSONAL INJURY , STAND CLEAR.
R
EMOVE FORK HOLE BRACKETS , BOARDS AND SHIPPING BRACE FROM BOTTOM
OF
UNIT BEFORE PLACING UNIT ONTO CURB .
CAUTION
1. Removewoodenstrutsandshippingbraceperinstallation
instructions. The struts are located in the fork holes and
areusedtoprotecttheunitfromdamagewhileliftingwith
forks. The shipping brace is located underneath the unit
(under compressors). Also remove the fork hole brackets
as shown in the following figure.
2. Locate and remove the end brackets as shown below.
LIFT OVERAPPROXIMATE
CENTER OF UNIT
SPREADER BARS
MUST BE USED WITH
LIFTING STRAPS THAT
ARE LESS THAN 16
FEETLONG
REMOVE 2 BRACKETS
ON EACH END TO
REMOVE
WOODEN STRUTS
REMOVE 2 BRACKETS
ON EACH END TO
REMOVE
SHIPPING BRACE

5
3. Lift unit per the “Rigging Details” section of this manual,
observing all warnings and cautions. When unit is lifted,
boards and shipping brace will drop if screws have been
removed. To avoid injury, STAND CLEAR.
4. Dispose of the boards and brace appropriately.
Curbinstallationsmustcomplywithlocalcodesandshouldbedone
inaccordancewiththeestablishedguidelinesoftheNationalRoof-
ing Contractors Association.
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.
Full perimeter roof curbs are available from the factory and are
shipped unassembled. Field assembly, squaring, leveling and
mounting on the roof structure are the responsibility of the in-
stalling contractor. All required hardware necessary for the as-
sembly of the sheet metal curb is included in the curb accessory.
T O PREVENT POSSIBLE EQUIPMENT DAMAGE , PROPERTY DAMAGE ,
PERSONAL INJURY OR DEATH , THE FOLLOWING BULLET POINTS MUST
BE OBSERVED WHEN INSTALLING THE UNIT .
WARNING
•Sufficient structural support must be determined prior to
locating and mounting the curb and package unit.
•Ductwork must be constructed using industry guidelines.
The duct work must be placed into the roof curb before
mounting the package unit. Our full perimeter curbs
includeduct connection framesto be assembledwiththe
curb. Cantilevered type curbs are not available from the
factory.
•Curb insulation, cant strips, flashing and general roofing
material are furnished by the contractor.
The curbs must be supported on parallel sides by roof members.
The roof members must not penetrate supply and return duct
opening areas as damage to the unit might occur.
NOTE:Theunitandcurbaccessoriesaredesignedtoallowvertical
ductinstallationbeforeunitplacement. Ductinstallationafterunit
placement is not 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
See the manual shipped with the roof curb for assembly and in-
stallation instructions.
CLEARANCES
36”; minimum
roof overhang
48” Min
.
65”
Min.*
48”
Min.
48”
Min.*
*Insituationsthathavemultipleunits,a48”minimumclearanceis
required between the condenser coils.
UNIT CLEARANCES
Adequateclearancearoundtheunitshouldbekeptforsafety,ser-
vice, maintenance, and proper unit operation. A total clearance
of75”aroundthisunitisrecommendedtofacilitatepossibleblower
assembly, shaft, wheel replacement, coil, heat exchanger, electric
heat and gas furnace removal. This unit must not be installed be-
neath any obstruction. This unit should be installed remote from
all building exhausts to inhibit ingestion of exhaust air into the
unit’s fresh air intake.
Insulated
Panels
Roof Curb Installation

6
ROOFCURB POST-INSTALLATION CHECKS
Afterinstallation,checkthetopofthecurb,ductconnectionframe
and duct flanges to make sure gasket has been applied properly.
Gasket should be firmly applied to the top of the curb perimeter,
duct flanges and any exposed duct connection frame. If gasket is
loose, re-apply using strong weather resistant adhesive.
PROTRUSION
Inspect curb to ensure that none of the utility services (electric)
routed through the curb protrude above the curb.
I F PROTRUSIONS EXIST , DO NO ATTEMPT TO SET UNIT ON CURB .
CAUTION
ROOFTOP DUCTCONNECTIONS
Install all duct connections on the unit before placing the unit on
rooftop.
RIGGINGDETAILS
WARNING
TO PREVENT PROPERTY DAMAGE, THE UNIT SHOULD REMAIN IN AN UPRIGHT
POSITION DURING ALL RIGGING AND MOVING OPERATIONS. TO FACILITATE
LIFTING AND MOVING WHEN A CRANE IS USED, PLACE THE UNITINAN
ADEQUATECABLE SLING.
D O NOT LIFT UNITS TWO AT A TIME . P ROVISIONS FOR FORKS HAVE
BEEN INCLUDED IN THE UNIT BASE FRAME . M INIMUM FORK LENGTH IS
72”
TO PREVENT DAMAGE TO THE UNIT .
CAUTION
Provisionsforforkshavebeenincludedintheunitbaseframe. No
other fork locations are approved.
WARNING
TO PREVENT POSSIBLE EQUIPMENT DAMAGE, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH, THE FOLLOWING BULLET POINTS MUST BE OBSERVED
WHEN INSTALLING THE UNIT.
• Unit must be lifted by the four lifting holes located at the
base frame corners.
• Liftingcablesshouldbeattachedtotheunitwithshackles.
• The distance between the crane hook and the top of the
unit must not be less than 60”.
• Two spreader bars must span over the unit to prevent
damage to the cabinet by the lift cables. Spreader bars
mustbe of sufficient length so that cablesdo not come in
contact with the unit during transport. Remove wood
struts mounted beneath unit base frame before setting
unit on roof curb. These struts are intended to protect
unit base frame from fork lift damage. Removal is
accomplishedbyextractingthe sheet metal retainers and
pulling the struts through the base of the unit. Refer to
rigging label on the unit.
Important: If using bottom discharge with roof curb, ductwork
shouldbeattachedtothecurbpriortoinstallingtheunit.Ductwork
dimensions are shown in Roof Curb Installation Instructions.
Refer to the Roof Curb Installation Instructions for proper curb
installation. Curbing must be installed in compliance with the Na-
tional Roofing Contractors Association Manual.
Lower unit carefully onto roof mounting curb. While rigging unit,
centerofgravitywillcausecondenserendtobelowerthansupply
air end.
W HEN UNIT IS SUSPENDED , BOARDS AND SHIPPING BRACE WILL DROP WHEN
SCREWS ARE REMOVED . T O PREVENT PERSONAL INJURY , STAND CLEAR.
R
EMOVE FORK HOLE BRACKETS , BOARDS AND SHIPPING BRACE FROM BOTTOM
OF
UNIT BEFORE PLACING UNIT ONTO CURB .
CAUTION
To assist in determining rigging requirements, unit weights are
shown as follows:
COMPRESSOR 1
COMPRESSOR 2
CG
EVAPORATORCOILS
A
B
C
XD
Y
CORNER & CENTER OF GRAVITY LOCATIONS

7
Corner Weight - A 590 644
Corner Weight - B 482 525
Corner Weight - C 492 504
Corner Weight - D 401 412
UnitShipping Weight 2080 2202
UnitOperatingWeight 1965 2085
X (Inches) 60" 58"
Y(Inches) 40" 40"
DCCWeights
(lbs)
DATA 15 Tons 20 Tons
NOTE: These weights are without accessories installed.
T O PREVENT SEVERE DAMAGE TO THE BOTTOM OF THE UNIT , DO NOT
FORK LIFT UNIT AFTER WOOD STRUTS HAVE BEEN REMOVED .
CAUTION
Bring condenser end of unit into alignment with the curb. With
condenserendofthe unit restingoncurbmemberandusing curb
as a fulcrum, lower opposite end of the unit until entire unit is
seated on the curb. When a rectangular cantilever curb is used,
care should be taken to center the unit. Check for proper align-
ment and orientation of supply and return openings with duct.
RIGGING REMOVAL
T O PREVENT DAMAGE TO THE UNIT , DO NOT ALLOW CRANE HOOKS
AND SPREADER BARS TO REST ON THE ROOF OF THE UNIT .
CAUTION
Removespreaderbars,liftingcablesandotherriggingequipment.
ELECTRICALWIRING
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
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 is in
excess of the circuit ampacity, but less than or equal to the maxi-
mum overcurrent protection device. DO NOT EXCEED THE MAXI-
MUM OVERCURRENT DEVICE SIZE SHOWN ON UNIT DATA PLATE.
All line voltage connections must be made through weatherproof
fittings. All exterior power supply and ground wiring must be in
approved weatherproof conduit.
The main power supply wiring to the unit and low voltage wiring
to accessory controls must be done in accordance with these in-
structions,thelatesteditionoftheNationalElectricalCode(ANSI/
NFPA 70), and all local codes and ordinances. All field wiring shall
conform with the temperature limitations for Type T wire (63°F/
35°C rise).
Themainpowersupply shall be three-phase,threewire. Theunit
is factory wired for the voltage shown on the unit’s data plate.
NOTE:Ifsupplyvoltageis208V,allleadsonprimaryoftransformer
TRANS1 must be moved from the 230V to the 208V tap.
Mainpowerwiringshouldbesizedfortheminimumwireampacity
shown on the unit’s data plate. Size wires in accordance with the
ampacity tables in Article 310 of the National Electrical Code. If
long wires are required, it may be necessary to increase the wire
sizetopreventexcessivevoltagedrop. Wiresshouldbesizedfora
maximum of 3% voltage drop.
CAUTION
TO AVOID PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE, USE
ONLY COPPER CONDUCTORS.
L ABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING
CONTROLS . W IRING ERRORS CAN CAUSE IMPROPER AND
DANGEROUS OPERATION . V ERIFY PROPER OPERATION AFTER
SERVICING .
CAUTION
NOTE: A weather-tight disconnect switch, properly sized for the
unittotalload,mustbefield orfactoryinstalled. Anexternalfield
supplied disconnect may be mounted on the exterior panel.
Ensure the data plate is not covered by the field-supplied
disconnect switch.

8
• Some disconnect switches are not fused. Protect the
powerleadsatthepointofdistributioninaccordancewith
the unit’s data plate.
• Theunitmustbeelectricallygroundedinaccordancewith
localcodesor,intheabsenceoflocalcodes,withthelatest
edition of the National Electrical Code (ANSI-NFPA 70). A
ground lug is provided for this purpose. Size grounding
conductorinaccordancewithTable250-95oftheNational
ElectricalCode. Do not use the groundlugforconnecting
a neutral conductor.
• Connect power wiring to the electrical middle contactor
within the main control box of power block, if equipped.
Low Voltage
Terminal Strip
Thermostat wiring
for all units
connect to low
voltage strip
Ground
Lug
Line voltage connects
to power block on
Coolers and the 230v
Gas Packs
Line voltage connects
to middle contactor
on 460v and 575v
Gas Packs
(or power block
if equipped)
Power Block
(Coolers &
230V Gas Packs
Only)
Field wiring enters
from this direction
POWER AND LOW VOLTAGE BLOCK LOCATIONS
F AILURE OF UNIT DUE TO OPERATION ON IMPROPER LINE VOLTAGE
OR WITH EXCESSIVE PHASE UNBALANCE CONSTITUTES PRODUCT
ABUSE
AND WILL VOID YOUR WARRANTY AND MAY CAUSE SEVERE
DAMAGE
TO THE UNIT ELECTRICAL COMPONENTS .
WARNING
Areas Without Convenience Outlet
It is recommended that an independent 115V power source be
brought to the vicinity of the roof top unit for portable lights and
tools used by the service mechanic.
NOTE: Refer to local codes for requirements. These outlets can
also be factory installed.
UNITS INSTALLED ON ROOF TOPS
Main power and low voltage wiring may enter the unit through
the side or through the roof curb. Install conduit connectors at
the desired entrance locations. External connectors must be
weatherproof. Allholesintheunitbasemustbesealed(including
those around conduit nuts) to prevent water leakage into build-
ing. All required conduit and fittings are to be field supplied.
Supplyvoltagetorooftopunitmustnotvarybymorethan10%of
the value indicated on the unit’s data plate. Phase voltage unbal-
ance must not exceed 2%. Contact your local power company for
correction of improper voltage or phase unbalance.
ELECTRICAL ENTRANCE LOCATIONS
Unit is equipped with Single Point Power Block and Low Voltage
Block.
LOW VOLTAGE CONTROL WIRING
1. A 24V thermostat must be installed for unit operation. It
may be purchased with the unit or field -supplied.
Thermostatsmaybeprogrammableorelectromechanical
as 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
exceeding75feet.Use#16AWGwirefor24Vcontrolwiring
runs not exceeding 125 feet. Use #14 AWG wire for 24V
control wiring runs not exceeding 200 feet. Low voltage
wiringmaybeNationalElectricalCode(NEC)Class2where
permitted by local codes.
4. Route thermostat wires from sub-base terminals to the
unit. Control wiring should enter through the duct panel
(dimplemarksentrancelocation).Connectthermostatand
any accessory wiring to low voltage terminal block TB1 in
the main control box.
NOTE: Field-supplied conduit may need to be installed
depending on unit/curb configuration. Use #18 AWG solid
conductor wire whenever connecting thermostat wires to
terminals on sub-base. DO NOT use larger than #18 AWG wire. A
transition to #18 AWG wire may be required before entering
thermostat sub-base.
NOTE: Refer to unit wiring diagrams for thermostat hookups.