Goodman ANSI Z21.47CSA-2.3 User manual

All information contained herein is subject to change without notice.
I NSTALLATION I NSTRUCTIONS F OR
C OMMERCIAL H EATING & C OOLING
15 & 20 T ON P ACKAGE G AS S ERIES
CPG S ERIES
RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION.
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.
This Forced Air Central Unit Design Complies With
Requirements Embodied in TheAmerican National
Standard / National Standard of Canada Shown
Below.
ANSI Z21.47•CSA-2.3 Central Furnaces
CUS
®
©2010 Goodman Manufacturing Company, L.P.
5151 San Felipe, Suite 500 ◊ Houston, TX 77056
www.goodmanmfg.com www.amana-hac.com
IO-366B
7/10

2
REPLACEMENT PARTS
ORDERING PARTS
Whenreportingshortagesordamages,or orderingrepair
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
GOODMAN MANUFACTURING COMPANY, L.P.
7401 SECURITY WAY
HOUSTON, TEXAS 77040
877-254-4729
SAFETY INSTRUCTIONS
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.
I F  THE  INFORMATION  IN  THESE  INSTRUCTIONS  IS  NOT  FOLLOWED 
EXACTLY , A  FIRE  OR  EXPLOSION  MAY  RESULT  CAUSING  PROPERTY
DAMAGE
, PERSONAL  INJURY  OR  LOSS  OF  LIFE .
D O  NOT  STORE  OR  USE  GASOLINE  OR  OTHER  FLAMMABLE  VAPORS  AND 
LIQUIDS  IN  THE  VICINITY  OF  THIS  OR  ANY  OTHER  APPLIANCE .
D
O  NOT  TRY  TO  LIGHT  ANY  APPLIANCE .
D
O  NOT  TOUCH  ANY  ELECTRICAL  SWITCH ; DO  NOT  USE  ANY  PHONE 
IN  YOUR  BUILDING .
I
MMEDIATELY  CALL  YOUR  GAS  SUPPLIER  FROM  A  NEIGHBOR ’ S 
PHONE .F OLLOW  THE  GAS  SUPPLIER ’ S  INSTRUCTIONS .
I
F  YOU  CANNOT  REACH  YOUR  GAS  SUPPLIER , CALL  THE  FIRE 
DEPARTMENT .
I
NSTALLATION  AND  SERVICE  MUST  BE  PERFORMED  BY  A  QUALIFIED 
INSTALLER , SERVICE  AGENCY  OR  THE  GAS  SUPPLIER .
WHATTODOIFYOUSMELLGAS:




WARNING
D O  NOT  CONNECT  TO  OR  USE  ANY  DEVICE  THAT  IS  NOT  DESIGN 
CERTIFIED  BY G OODMAN  FOR  USE  WITH  THIS  UNIT .S ERIOUS  PROPERTY 
DAMAGE , PERSONAL  INJURY , REDUCED  UNIT  PERFORMANCE  AND / OR 
HAZARDOUS  CONDITIONS  MAY  RESULT  FROM  THE  USE  OF  SUCH  NON ‐
APPROVED  DEVICES .
WARNING
S HOULD  OVERHEATING  OCCUR  OR  THE  GAS  SUPPLY  FAIL  TO  SHUT  OFF ,
TURN  OFF  THE  MANUAL  GAS  SHUTOFF  VALVE  EXTERNAL  TO  THE 
FURNACE  BEFORE  TURNING  OFF  THE  ELECTRICAL  SUPPLY .
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
Index
Replacement Parts ........................................................2
Safety Instructions ........................................................2
General Information ......................................................3
Unit Location .................................................................4
Clearances .....................................................................6
Roof Curb Post-Installation Checks ............................7
Roof Top Duct Connections .........................................7
Rigging Details ..............................................................7
Electrical Wiring ............................................................8
Gas Supply Piping.......................................................10
Propane Gas Installations ..........................................12
Circulating Air and Filters...........................................13
Venting .........................................................................13
Condensate Drain Connection ...................................13
Startup, Adjustments, and Checks ............................14
Normal Sequence Of Operation .................................19
Troubleshooting ..........................................................20
Input Rating .................................................................21
Air flow Adjustments...................................................21
Motor Sheave Adjustments ........................................22
Maintenance ................................................................22
Appendix A Blower Performance Data ......................24
Belt Drive - STANDARD HORIZONTAL ......................24
Belt Drive - HIGH STATIC ............................................25
Appendix B Electrical Data.........................................26
Appendix C Unit Dimensions .....................................27

3
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
T O  AVOID  PROPERTY  DAMAGE , PERSONAL  INJURY  OR  DEATH , DO  NOT 
USE  THIS  UNIT  IF  ANY  PART  HAS  BEEN  UNDER  WATER .I MMEDIATELY 
CALL  A  QUALIFIED  SERVICE  TECHNICIAN  TO  INSPECT  THE  FURNACE  AND 
TO  REPLACE  ANY  PART  OF  THE  CONTROL  SYSTEM  AND  ANY  GAS 
CONTROL  HAVING  BEEN  UNDER  WATER .
WARNING
T HIS  UNIT  MUST  NOT  BE  USED  AS  A “ CONSTRUCTION  HEATER ” DURING 
THE  FINISHING  PHASES  OF  CONSTRUCTION  ON  A  NEW  STRUCTURE .T HIS 
TYPE  OF  USE  MAY  RESULT  IN  PREMATURE  FAILURE  OF  THE  UNIT  DUE  TO 
EXTREMELY  LOW  RETURN  AIR  TEMPERATURES  AND  EXPOSURE  TO 
CORROSIVE  OR  VERY  DIRTY  ATMOSPHERES .
WARNING
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  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 .
WARNING
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
This compartment must be closed except
when servicing.
RISQUE D'EMPOISONNEMENT AU
MONOXYDE DE CARBONE
Si ce compartiment n'est pas ferme en tout temps, sauf
en cas de reparation, il y a risque d'empoisonnement
ou monoxyde de carbon ou de mort.
Ce compartiment doit être ferme sauf au
moment de l'entretien.
PELIGRO MONOXIDO DE CARBONO
TOXICO
El fracaso de no mantener compartimiento cerrado
menos durante, atender, podria tener como resultado
envenar de monoxido de carbona o muerte.
Este compartimiento debe cerrado menos
al atender.
CARBON MONOXIDE POISONING HAZARD
Failure to keep this compartment closed except
when servicing could result in carbon monoxide
poisoning or death.
Failure to keep this compartment closed except
when servicing could result in carbon monoxide
poisoning or death.
0140L00106 REV C
WARNING
DANGER
PELIGRO
GENERALINFORMATION
T O  PREVENT  PROPERTY  DAMAGE , PERSONAL  INJURY  OR  DEATH  DUE  TO 
FIRE , EXPLOSIONS , SMOKE , SOOT , CONDENSATION , ELECTRIC  SHOCK  OR 
CARBON  MONOXIDE , THIS  UNIT  MUST  BE  PROPERLY  INSTALLED ,
REPAIRED , OPERATED  AND  MAINTAINED .
WARNING
This unit is approved for outdoor installation ONLY. To
assure that your unit operates safely and efficiently, it must
be installed, operated, and maintained in accordance with
these installation and operating instructions, all local building
codes and ordinances, or in their absence, with the latest
edition of the National Fuel Gas Code NFPA54/ANSI Z223.1
and National Standard of Canada CAN/CSA B149 Installa-
tion Codes.
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
byan approvedmethod orin accordancewithASHRAE Guide
or Manual J - Load Calculations published by the Air Condi-
tioning Contractors of America.
Obtain from:
American National Standards Institute
1430 Broadway
New York, NY 10018

4
Systemdesign and installationshould also,where applicable,
followinformation presentedin accepted industryguides such
as the ASHRAE Handbooks. The manufacturer assumes no
responsibility for equipment installed in 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 con-
nections; and drain connections (if required). The internal
systemsof theunitare completelyfactory-installedand tested
prior to shipment.
Units are generally installed on a steel roof mounting curb
assembly which has been shipped to the job site for installa-
tion on the roof structure prior to the arrival of the unit. The
model number shown on the unit’s identification plate identi-
fies the various components of the unit such as refrigeration
tonnage, heating input and voltage.
Carefully inspect the unit for damage including damage to
the cabinetry. 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. In case of concealed damage, carrier should be
notified as soon as possible-preferably within 5 days.
4. File theclaimwiththefollowingsupportingdocuments:
a. Original Bill of Lading, certified copy, or indemnity
bond.
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,
remove all packaging materials. Recycle or dispose of the
packaging material according to local codes.
PRE-INSTALLATION CHECKS
Carefully read all instructions for the installation prior to in-
stalling unit. Ensure each step or procedure is understood
and any special considerations are taken into account be-
fore starting installation. Assemble all tools, hardware and
suppliesneeded tocomplete theinstallation.Some itemsmay
need to be purchased locally.
UNIT LOCATION
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
installation of the unit. See important note under Roof Curb
Installation Only.
ALL INSTALLATIONS:
IMPORTANT NOTE:Unitshouldbeenergized24hoursprior
to compressor start up to ensure crankcase heater has
sufficientlywarmedthecompressors.Compressordam-
age 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.
Improper installation can result in problems ranging from
noisy operation to property or equipment damages, danger-
ous conditions that could result in injury or personal property
damage and could void the warranty. Give this booklet to the
user and explain it’s provisions.The user should retain these
instructions for future reference.
•For proper flame pattern within the heat exchanger
and proper condensate drainage, the unit must be
mounted level.
•The flue outlet must be at least 12 inches from any
opening through which flue gases could enter a
building, and at least three feet above any forced air
inlet located within ten feet. The economizer/manual
fresh air intake/motorized fresh air intake and
combustion air inlet mounted on the unit are not
affected by this restriction.
•To avoid possible corrosion of the heat exchanger,
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.Commonsourcesofsuch compoundsinclude
swimmingpool chemicalsandchlorinebleaches,paint
stripper, adhesives,paints, varnishes, sealers, waxes
(which are not yet dried) and solvents used during
constructionand remodeling.Various commercialand
industrial processes may also be sources of chlorine/
fluorine compounds.
•To avoid possible illness or death of the building
occupants, do NOT locate outside air intake device
(economizer, manual freshair 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,proper operation, and serviceaccess(see
unit clearances). These clearances must be
permanently maintained.

5
•The combustion air inlet and flue outlet on the unit
must never be obstructed. If used, do not allow the
economizer/manualfresh airdamper/motorized fresh
air damper to become blocked by snow or debris. In
some climates or locations, it may be necessary to
elevate the unit to avoid these problems.
•Whenthe unitisheating, thetemperature of thereturn
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, a level concrete (or equal) base is
recommended. Prepare a base that is 3” larger than
the package unit footprint and a minimum of 3” thick.
•The base should also be located where no runoff of
water from higher ground can collect in the unit.
ROOF TOP INSTALLATIONS ONLY:
•To avoidpossibleproperty damage orpersonalinjury,
theroofmusthavesufficientstructural strengthtocarry
the weight of the unit(s) and snow or water loads as
requiredby local codes. Consulta structural engineer
to determine the weight capabilities of the roof.
•The unit may be installed directly on wood floors or
onClassA, ClassB,or ClassC roofcovering material.
•To avoid possible personal injury, a safe, flat surface
for service personnel should be provided.
•As indicated on the unit data plate, a minimum
clearance of 36” to any combustible material is
required on the furnace access side of the unit. All
combustible materials must be kept out of this area.
•This 36” clearance must also be maintained to insure
proper combustion air and flue gas flow. The
combustionair intakeand furnace fluedischarge must
not be blocked for any reason, including blockage by
snow.
•Adequate clearances from the furnace flue discharge
to any adjacent public walkways, adjacent buildings,
building openings or openable windows must be
maintained in accordance with the latest edition of
the National Fuel Gas Code (ANSI Z223.1)
•Minimumhorizontalclearanceof 48” fromthefurnace
flue discharge to any electric meters, gas meters,
regulators and relief equipment is required.
UNIT PRECAUTIONS
• Do not stand or walk on the unit.
• Except for holes in the wiring entrances (see Figure
below), do not drill holes anywhere in panels or in
the base frame of the unit. Unit access panels
provide structural support.
ELECTRICAL ENTRANCE LOCATIONS
• Donot remove anyaccesspanelsuntilunit has been
installed on roof curb or field supplied structure.
• Do not roll unit across finished roof without prior
approval of owner or architect.
• Do not skid or slide on any surface as this may
damage unit base. The unit must be stored on a
flat, level surface. Protect the condenser coil
because it is easily damaged.
ROOF CURB INSTALLATIONS ONLY:
Before installing this unit...
IMPORTANTNOTE: Thisunit has beenequipped with aship-
ping brace under the compressor section that MUST BE RE-
MOVED before 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. Remove wooden struts and shipping brace per
installation instructions. The struts are located in the
fork holes and are used to protect the unit from
damage while lifting with forks. The shipping brace
is located under the unit (under compressor). Also
remove the fork hole brackets as shown in the
following figure.
2. Locate and remove the end brackets as shown in the
following figure.

6
LIFT OVER APPROXIMATE
CENTER OF UNIT
SPREADER BARS
MUST BE USED WITH
LIFTING STRAPS THAT
ARE LESS THAN 16
FEET LONG
REMOVE 2 BRACKETS
ON EACH END TO
REMOVE
WOODEN STRUTS
REMOVE 2 BRACKETS
ON EACH END TO
REMOVE
SHIPPING BRACE
3.Liftunit perthe “RiggingDetails”section ofthis manual,
observing all warnings and cautions. When unit is
lifted, boards and shipping brace will drop if screws
havebeen removed. Toavoid injury,STANDCLEAR.
4. Dispose of the boards and brace appropriately.
Curb installations must comply with local codes and should
be done in accordance with the established guidelines of the
National Roofing 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, level-
ing and mounting on the roof structure are the responsibility
of the installing contractor. All required hardware necessary
for the assembly 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
•Sufficientstructural supportmustbe 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 include duct connection frames to be
assembled with the 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 mem-
bers. The roof members must not penetrate supply and re-
turn duct opening areas as damage to the unit might occur.
NOTE: The unit and curb accessories are designed to allow
vertical duct installation before unit placement. Duct
installation after unit 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  SUPERCEDE 
INFORMATION  SHOWN .
CAUTION
See the manual shipped with the roof curb for assembly and
installation instructions.
CLEARANCES
6”
72”72”72”
48”48”48”
48”
36”; minimum
roof overhang
UNIT CLEARANCES
Adequateclearance around theunitshould bekeptfor safety,
service,maintenance, andproper unitoperation. Atotalclear-
ance of 75” on the main control panel side of the unit is rec-
ommended to facilitate possible fan shaft, coil, electric heat
andgas furnaceremoval. Aclearanceof48” isrecommended
on all other sides of the unit to facilitate possible compressor

7
removal, to allow service access and to insure proper venti-
lation and condenser airflow. The unit must not be installed
beneath any obstruction. The unit should be installed re-
mote from all building exhausts to inhibit ingestion of exhaust
air into the unit fresh air intake.
INSULATED
PANELS
ROOF CURB INSTALLATION
ROOF CURB POST-INSTALLATION
CHECKS
After installation, check the top of the curb, duct connection
frame and duct flanges to make sure gasket has been ap-
plied properly. Gasket should be firmly applied to the top of
the curb perimeter, duct flanges and any exposed duct con-
nection frame. If gasket is loose, re-apply using strong
weather resistant adhesive.
PROTRUSION
Inspect curb to ensure that none of the utility services (elec-
tric) routed through the curb protrude above the curb.
I F  PROTRUSIONS  EXIST , DO  NOT  ATTEMPT  TO  SET  UNIT  ON  CURB .
I
NFORMATION  SHOWN .
CAUTION
ROOF TOP DUCT CONNECTIONS
Install all duct connections on the unit before placing the unit
on rooftop.
RIGGING DETAILS
T O  PREVENT  PROPERTY  DAMAGE , THE  UNIT  SHOULD  REMAIN  IN  AN 
UPRIGHT  POSITION  DURING  ALL  RIGGING  AND  MOVING  OPERATIONS .
T
O  FACILITATE  LIFTING  AND  MOVING  WHEN  A  CRANE  IS  USED , PLACE 
THE  UNIT  IN  AN  ADEQUATE  CABLE  SLING .
WARNING
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
Provisionsfor forkshave beenincluded inthe unitbaseframe.
No other fork locations are approved.
T O  PREVENT  POSSIBLE  EQUIPMENT  DAMAGE , PROPERTY  DAMAGE ,
PERSONAL  INJURY  OR  DEATH , THE  FOLLOWING  BULLET  POINTS  MUST  BE 
OBSERVED  WHEN  INSTALLING  THE  UNIT .
WARNING
• Unit must be lifted by the four lifting holes located at
the base frame corners.
• Lifting cables should be attached to the unit with
shackles.
• 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 must be of sufficient length so that cables do 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 accomplished by extracting the
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, duct-
work should be attached to the curb prior to installing the
unit. Ductwork dimensions are shown in Roof Curb Installa-
tion Instructions.
Referto the RoofCurb InstallationInstructions forproper curb
installation. Curbing must be installed in compliance with the
National Roofing Contractors Association Manual.
Lower unit carefully onto roof mounting curb. While rigging
unit, center of gravity will cause condenser end to be lower
than supply air end.

8
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
CPG Weights CPG Weights
(lbs) (lbs)
15 Tons 20 Tons
Corner Weight - A 570 655
Corner Weight - B 535 535
Corner Weight - C 545 600
Corner Weight - D 510 485
Unit Shipping Weight 2270 2390
Unit Operating Weight 2155 2275
X (Inches) 65" 63"
Y (Inches) 43" 40"
DATA
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
Bringcondenser endofunit intoalignment with thecurb. With
condenser end of the unit resting on curb member and using
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 alignment 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
Removespreader bars, liftingcables and other riggingequip-
ment.
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
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
maximum overcurrent protection device. DO NOT EXCEED
THE MAXIMUM OVERCURRENT DEVICE SIZE SHOWN
ON UNIT DATA PLATE.

9
All line voltage connections must be made through weather-
proof 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
wiringto accessory controlsmustbe done inaccordancewith
these instructions, the latest edition of the National Electrical
Code (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).
The main power supply shall be three-phase, three wire. The
unit is factory wired for the voltage shown on the unit’s data
plate.
NOTE: Ifsupply voltageis208V,all leads on primaryof trans-
former TRANS1 must be moved from the 230V to the 208V
tap.
Main power wiring should be sized for the minimum wire
ampacity shown on the unit’s database. Size wires in accor-
dance with the ampacity tables inArticle 310 of the National
Electrical Code. If long wires are required, it may be neces-
sary to increase the wire size to prevent excessive voltage
drop. Wires should be sized for a maximum of 3% voltage
drop.
T O  AVOID  PROPERTY  DAMAGE  OR  PERSONAL  INJURY  DUE  TO  FIRE , USE 
ONLY  COPPER  CONDUCTORS .
CAUTION
T O  PREVENT  IMPROPER  AND  DANGEROUS  OPERATION  DUE  TO  WIRING 
ERRORS , LABEL  ALL  WIRES  PRIOR  TO  DISCONNECTION  WHEN  SERVICING 
CONTROLS .V ERIFY  PROPER  OPERATION  AFTER  SERVICING .
CAUTION
NOTE: A weather-tight disconnect switch, properly sized for
the unit total load, must be field installed. An external field
supplied disconnect may be mounted on the exterior panel.
Ensure the data plate is not covered by the field-supplied
disconnect switch.
• Some disconnect switches are not fused. Protect the
power leads at the point of distribution in accordance
with the unit data plate.
• The unit must be electrically grounded in accordance
with local codes or, in the absence of local codes,
with the latest edition of the National Electrical Code
(ANSI-NFPA 70). A ground lug is provided for this
purpose. Size grounding conductor in accordance
with Table 250-95 of the National Electrical Code. Do
not use the ground lug for connecting a neutral
conductor.
• Connect power wiring to the middle contactor within
the main control box.
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
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.
UNITS INSTALLED ON ROOF TOPS
Mainpower and low voltagewiring mayenterthe unit through
the side or through the roof curb. Install conduit connectors
at the desired entrance locations. External connectors must
be weatherproof. All holes in the unit base must be sealed
(including those around conduit nuts) to prevent water leak-
age into building. All required conduit and 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
voltage unbalance must not exceed 2%. Contact your local
power company for correction of improper voltage or phase
unbalance.

10
ELECTRICAL ENTRANCE LOCATIONS
Unit is equipped with a Low Voltage Terminal Block and has
Single Point wiring to the contactor.
LOW VOLTAGE CONTROL WIRING
1. A24V thermostat must be installed for unit operation.
It may be purchased with the unit or field -supplied.
Thermostats may be programmable or
electromechanical as required.
2. Locate thermostatorremote sensorinthe conditioned
space where it will sense average temperature. Do
notlocate thedevicewhere itmay be directlyexposed
to supply air, sunlight or other sources of heat. Follow
installationinstructionspackagedwiththe thermostat.
3. Use #18 AWG wire for 24V control wiring runs not
exceeding 75 feet. Use #16AWG wire for 24V control
wiring runs not exceeding 125 feet. Use #14 AWG
wire for 24V control wiring runs not exceeding 200
feet. 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. Control wiring should enter through the duct
panel (dimple marks entrance location). Connect
thermostat and 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.
LEAD THERMOSTAT
Red R (24V)
Green G (Fan)
Yellow Y1 (High Cool)
Purple Y2 (Low Cool)
Blue Common (if req'd)
White W1 (Heat)
Brown W2 (High Heat)
CPG240 (GAS HEAT)
GAS SUPPLY PIPING
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
IMPORTANT NOTE: This unit is factory set to operate on
natural gas at the altitudes shown on the rating plate.
T O  PREVENT  PROPERTY  DAMAGE , PERSONAL  INJURY  OR  DEATH  WHEN 
EITHER  USING  PROPANE  GAS  ALONE  OR  AT  HIGHER  ALTITUDES , OBTAIN 
AND  INSTALL  THE  PROPER  CONVERSION  KIT ( S ).F AILURE  TO  DO  SO  CAN 
RESULT  IN  UNSATISFACTORY  OPERATION  AND / OR  EQUIPMENT  DAMAGE .
H
IGH  ALTITUDE  KITS  ARE  FOR U.S.I NSTALLATIONS  ONLY  AND  ARE  NOT 
APPROVED  FOR  USE  IN C ANADA .
WARNING
The rating plate is stamped with the model number, type of
gas and gas input rating. Make sure the unit is equipped to
operate on the type of gas available. Conversion to propane
(LP) gas is permitted with the use of the factory authorized
conversion kit (see the unit Technical Manual for the appro-
priate kit). For HighAltitude derates, refer to the latest edition
of the National Fuel Gas Code NFPA 54/ANSI Z223.1.
NATURAL Min. 5.0" W.C., Max. 10.0" W.C.
PROPANE Min. 11.0"W.C., Max. 14.0" W.C.
INLETGAS PRESSURE
Inlet Gas Pressure Must Not Exceed the Maximum Value Shown in Table
Above.
The minimum supply pressure should not vary from that
shown in the table above because this could prevent the unit
from having dependable ignition. In addition, gas input to the
burners must not exceed the rated input shown on the rating
plate. Overfiring of the unit could result in premature heat
exchanger failure.
PIPING
IMPORTANT NOTE: To avoidpossibleunsatisfactory opera-
tion or equipment damage due to under firing of equipment,
do not undersize the natural/propane gas piping from the
meter/tank to the unit. When sizing a trunk line, include all
applianceson that linethat couldbeoperated simultaneously.
The rating plate is stamped with the model number, type of
gas and gas input rating. Make sure the unit is equipped to
operate on the type of gas available. The gas line installation
mustcomplywithlocalcodes,orin theabsence oflocal codes,
with the latest edition of the National Fuel Gas Code NFPA
54/ANSI Z223.1.

11
Natural Gas Connection
Len
g
th of
Pipe in Feet 1/2 3/4 11 1/4 1 1/2
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 980
40 63 130 245 500 760
50 56 115 215 440 670
60 50 105 195 400 610
70 46 96 180 370 560
80 43 90 170 350 530
90 40 84 160 320 490
100 38 79 150 305 460
Pressure = .50 PSIG or less and Pressure Drop of 0.3" W.C. (Based
on 0.60 S
p
ecific Gravit
y
Gas
)
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour
(
CFH
)
Nominal Black Pipe Size (inches)
BTUH Furnace Input
Heatin
g
Value of Gas
(
BTU/Cubic Foot
)
CFH =
Refer to the Proper Piping Practice drawing for the general
layout at the unit. The following rules apply:
1. Use black iron pipe and fittings for the supply piping.
The use of a flex connector and/or copper piping is
permitted as long as it is in agreement with local
codes.
2. Use pipe joint compound on male threads only. Pipe
joint compound must be resistant to the action of the
fuel used.
3. Use ground joint unions.
4. Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum
of three inches long.
5. Use two pipe wrenches when making connection to
the gas valve to keep it from turning.
6. Installa manual shut-offvalvein a convenientlocation
(within six feet of unit) between the meter and the
unit.
7. Tighten all joints securely.
8. The unit must be connected to the building piping by
one of the following methods:
• Rigid metallic pipe and fittings
• Semirigid metallic tubing and metallic fittings
(Aluminum alloy tubing must not be used in exterior
locations)
• Listedgas appliance connectorsused in accordance
with the terms of their listing that are completely in
the same room as the equipment
• In the prior two methods above the connector or
tubing must be protected from physical and thermal
damage.Aluminum alloytubing andconnectors must
becoated to protect againstexternal corrosion when
in contact with masonry, plaster or insulation or are
subject to repeated wettings by liquids (water - not
rain water, detergents or sewage).
46-1/10”
GAS INLET LOCATION (3/4” NPT)
46-1/10”46-1/10”
74-11/12”
HOOD LOCATED
INSIDE HEAT SECTION
DURING SHIPPING
DOOR
PROVIDE
CLEARANCE
FOR REMOVAL OF
ACCESS PANELS
DRIP LEG
GROUND
JOINT
UNION
MANUAL
SHUT OFF
VALVE
PROPER PIPING PRACTICE
NOTE: The unit gas supply entrance is factory sealed with
plugs. Keep plugs in place until gas supply is ready to be
installed. Once ready, replace the plugs with the supplied
grommets and install gas supply line.

12
GAS PIPING CHECKS
T O  PREVENT  PROPERTY  DAMAGE  OR  PERSONAL  INJURY  DUE  TO  FIRE ,
THE  FOLLOWING  INSTRUCTIONS  MUST  BE  PERFORMED  REGARDING  GAS 
CONNECTIONS  AND  PRESSURE  TESTING :
•T
HE  UNIT  AND  ITS  GAS  CONNECTIONS  MUST  BE  LEAK  TESTED 
BEFORE  PLACING  IN  OPERATION .B ECAUSE  OF  THE  DANGER  OF 
EXPLOSION  OR  FIRE , NEVER  USE  A  MATCH  OR  OPEN  FLAME  TO  TEST 
FOR  LEAKS .N EVER  EXCEED  SPECIFIED  PRESSURES  FOR  TESTING .
H
IGHER  PRESSURE  MAY  DAMAGE  GAS  VALVE  AND  CAUSE 
OVERFIRING  WHICH  MAY  RESULT  IN  PREMATURE  HEAT  EXCHANGE 
FAILURE .
•T
HIS  UNIT  AND  ITS  SHUT ‐ OFF  VALVE  MUST  BE  DISCONNECTED  FROM 
THE  GAS  SUPPLY  DURING  ANY  PRESSURE  TESTING  OF  THAT  SYSTEM 
AT  TEST  PRESSURES  IN  EXCESS  OF 1/2PSIG(3.48 K P A ).
•T
HIS  UNIT  MUST  BE  ISOLATED  FROM  THE  GAS  SUPPLY  SYSTEM  BY 
CLOSING  ITS  MANUAL  SHUT ‐ OFF  VALVE  DURING  ANY  PRESSURE 
TESTING  OF  THE  GAS  SUPPLY  PIPING  SYSTEM  AT  TEST  PRESSURES 
EQUAL  TO  OR  LESS  THAN 1/2PSIG(3.48 K P A ).
CAUTION
T O  AVOID  PROPERTY  DAMAGE  OR  PERSONAL  INJURY , BE  SURE  THERE  IS 

IN  THE  VICINITY  DURING  AIR  BLEEDING . NO  OPEN  FLAME
WARNING
There will be air in the gas supply line after testing for leaks
on a new installation. Therefore, the air must be bled from
the line by loosening the ground joint union until pure gas is
expelled. Tighten union and wait for five minutes until all gas
has been dissipated in the air. Be certain there is no open
flame in the vicinity during air bleeding procedure. The unit is
placed in operation by closing the main electrical disconnect
switch for the unit.
PROPANE GAS INSTALLATIONS
T O  AVOID  PROPERTY  DAMAGE , PERSONAL  INJURY  OR  DEATH  DUE  TO 
FIRE  OR  EXPLOSION  CAUSED  BY  A  PROPANE  GAS  LEAK , INSTALL  A  GAS 
DETECTING  WARNING  DEVICE .S INCE  RUST  CAN  REDUCE  THE  LEVEL  OF 
ODORANT  IN  PROPANE  GAS , A  GAS  DETECTING  WARNING  DEVICE  IS  THE 
ONLY  RELIABLE  WAY  TO  DETECT  A  PROPANE  GAS  LEAK .C ONTACT  A 
LOCAL  PROPANE  GAS  SUPPLIER  ABOUT  INSTALLING  A  GAS  DETECTING 
WARNING  DEVICE .
WARNING
IMPORTANT NOTE: Propane gas conversion kits must be
installed to convert units to propane gas.
All propane gas equipment must conform to the safety
standards of the National Board of Fire Underwriters (See
NBFU Manual 58). Line pressure 11.3 - 14” w.c.
For satisfactory operation, propane gas manifold pressure
must be within 9.7 - 10.3 inches w.c. for high fire and within
6.7 - 7.3 inches w.c. low fire at the manifold with all gas appli-
ancesin operation.Maintaining proper gaspressure depends
on three main factors:
1. Vaporization rate, which depends on (a) temperature
of the liquid, and (b) wetted surface area of the
container or containers.
2. Proper pressure regulation.
3. Pressure drop in lines between regulators, and
between second stage regulator and the appliance.
Pipe size required will depend on length of pipe run
and total load of all appliances.
TANKS AND PIPING
Complete information regarding tank sizing for
vaporization, recommended regulator settings and pipe
sizingis availablefrom mostregulatormanufacturers and
propane gas suppliers.
Sincepropanegas willquickly dissolvewhite leador most
standard commercial compounds, special pipe dope
must be used. Shellac base compounds resistant to the
actions of liquefied petroleum gases such as Gasolac®,
Stalactic®, Clyde’s®or John Crane®are satisfactory.
See following figure for typical propane gas piping.
200 PSIG
Maximum
5 to 15 PSIG
(20 PSIG Max.) Continuous
11" W.C.
Second Stage
Regulator
First Stage
Regulator
TYPICAL PROPANE GAS PIPING
ROOF TOP LOCATION AND INSTALLATION
The gas supply piping location and installation for roof top
units must be in accordance with local codes or, in the ab-
sence of locals codes, with ordinances of the latest edition of
the National Fuel Gas Code (ANSI Z223.1).
Amanual gas shutoff valve must be field installed external to
the roof top unit. In addition, a drip leg must be installed near
the inlet connection. A ground joint union connection is re-
quired between the external shutoff valve and the unit con-
nection to the gas valve to permit removal of the burner as-
sembly for servicing.
1. Route gas piping to unit so that it does not interfere
with the removal of access panels. Support and align
piping to prevent strains or misalignment of the
manifold assembly.
2. All units are furnished with standard female NPTpipe
connections. Connection pipe size is 3/4" NPT. The
sizeof the gassupply piping tothe unit mustbebased
on length of run, number of units on the system, gas
characteristics,BTU requirementand availablesupply
pressure.All piping must be done in accordance with
local codes or, in the absence of local codes, with the
latest edition of the National Fuel Gas Code (ANSI
Z223.1).

13
NOTE: Thegasconnectionsizeat theunit doesNOT
establish the size of the supply line.
3. Theseunitsare designedforeither naturalor propane
(LP)gas andare specificallyconstructedat thefactory
for only one of these fuels. The fuels are NOT
interchangeable. However, the furnace can be
converted in the field from natural gas to LP gas with
the appropriate factory kit (see unit Technical Manual
for the appropriate kit). Only a qualified contractor,
experienced with natural and propane gas systems,
should attempt conversion. Kit instructions must be
followed closely to assure safe and reliable unit
operation.
4. With all units on a common line operating under full
fire, natural gas main supply pressure should be
adjusted to approximately 7.0" w.c., measured at the
unitgas valve. Ifthe gas pressureatthe unitisgreater
than10.5"w.c., thecontractormust furnish and install
an external type positive shutoff service pressure
regulator. The unit will not function satisfactorily if
supply gas pressure is less than 5.5" w.c. or greater
than 10.5" w.c..
NOTE: A minimum horizontal distance of 48"
between the regulator and the furnace flue discharge
is required.
5. With all units on a common line operating under full
LP gas main supply pressure should be at least 11.0"
w.c. andmust beno greaterthan14.0" w.c., measured
atthe unitgas valve. Unitwill notfunction satisfactorily
ifsupply gaspressureis lessthan 11.0"w.c.orgreater
than 14.0" w.c..
6. All pipe connections should be sealed with a pipe
thread compound, which is resistant to the fuel used
with the furnace. A soapy water solution should be
used to check all joints for leaks.A1/8" NPT plugged
tap is located on the entering side of the gas valve for
test gauge connection to measure supply (main) gas
pressure. Another 1/8" tap is provided on the side of
the manifold for checking manifold pressure.
T HIS  UNIT  AND  ITS  INDIVIDUAL  SHUTOFF  VALVE  MUST  BE 
DISCONNECTED
FROM  THE  GAS  SUPPLY  SYSTEM  DURING  ANY 
PRESSURE  TESTING  OF  THAT  SYSTEM  AT  TEST  PRESSURES  IN  EXCESS  OF 
1/2PSIG(13.8”
W . C .).
WARNING
T HIS  UNIT  MUST  BE ISOLATED FROM  THE  GAS  SUPPLY  PIPING  SYSTEM 
BY  CLOSING  ITS  INDIVIDUAL  MANUAL  SHUTOFF  VALVE  DURING  ANY 
PRESSURE  TESTING  EQUAL  TO  OR  LESS  THAN 1/2PSIG.
CAUTION
7. There must be no obstruction to prevent the flow of
combustion and ventilating air. A vent stack is not
required and must never be used. The power ventor
will supply an adequate amount of combustion air as
long as the air passageways are kept free of any
obstructions and the recommended external unit
clearances are maintained.
CIRCULATINGAIR AND FILTERS
DUCTWORK
The supply duct should be provided with an access panel
large enough to inspect the air chamber downstream of the
heat exchanger. A cover should be tightly attached to pre-
vent air leaks.
Ductwork dimensions are shown in the roof curb installation
manual.
If desired, supply and return duct connections to the unit may
be made with flexible connections to reduce possible unit
operating sound transmission.
VENTING
NOTE: Venting is self-contained.
CONDENSATE DRAIN CONNECTION
CONDENSATE DRAIN CONNECTION
A 3/4” NPT drain connection is supplied for condensate pip-
ing. An external trap must be installed for proper condensate
drainage.
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
and fittings or larger. Do not operate without trap.
HORIZONTAL DRAIN
Drainage of condensate directly onto the roof may be ac-
ceptable; refer to local code. It is recommended that a small
drip pad of either stone, mortar, wood or metal be provided to
prevent any possible damage to the roof.
CLEANING
Due to the fact that drain pans in any air conditioning unit
will have some moisture in them, algae and fungus will
grow due to airborne bacteria and spores. Periodic clean-
ing is necessary to prevent this build-up from plugging the
drain.

14
STARTUP,ADJUSTMENTS,AND CHECKS
HIGHVOLTAGE!
T O  AVOID  PERSONAL  INJURY  OR  DEATH  DUE  TO 
ELECTRICAL  SHOCK , BOND  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 .
WARNING
PRE-STARTUP INSTRUCTIONS
T O  PREVENT  PROPERTY  DAMAGE  OR  PERSONAL  INJURY ,D O  NOT  START 
THE  UNIT  UNTIL  ALL  NECESSARY  PRE ‐ CHECKS  AND  TEST  HAVE  BEEN 
PERFORMED .
CAUTION
Prior to the beginning of Startup, Adjustments, and Checks
procedures, the following steps should be completed in the
building.
THERMOSTAT. Set the thermostat in the conditioned
spaceata pointat least10°F belowzone temperature.
Set the thermostat system switch on COOL and the
fan switch on AUTO.
MOVINGMACHINERYHAZARD!
T
O  PREVENT  POSSIBLE  PERSONAL  INJURY  OR  DEATH , DISCONNECT 
POWER  TO  THE  UNIT  AND  PADLOCK  IN  THE “OFF” POSITION  BEFORE 
SERVICING  FANS .
WARNING
HEATING STARTUP
This unit is equipped with an electronic ignition device to au-
tomatically light the main burners. It also has a power vent
blower to exhaust combustion products.
On new installations, or if a major component has been re-
placed, the operation of the unit must be checked.
Check unit operation as outlined in the following instructions.
If any sparking, odors, or unusual sounds are encountered,
shut off electrical power and recheck for wiring errors, or ob-
structions in or near the blower motors. Duct covers must
be removed before operating unit.
The Startup,Adjustments, and Checks procedure provides a
step-by-step sequence which, if followed, will assure the
proper startup of the equipment in the minimum amount of
time. Air balancing of duct system is not considered part of
this procedure. However, it is an important phase of any air
conditioning system startup and should be performed upon
completion of the Startup, Adjustments, and Checks proce-
dure. The Startup, Adjustments, and Checks procedure at
outside ambients below 55°F should be limited to a readi-
ness check of the refrigeration system with the required final
check and calibration left to be completed when the outside
ambient rises above 55°F.
TOOLS REQUIRED
Refrigeration gauge and manifold
Voltmeter
Clamp-on ammeter
Ohmmeter
Test lead
(Minimum #16 AWG with insulated alligator clips)
Manometer for verifying gas pressure 0 to 20" w.c.
Air temperature measuring device
General refrigeration mechanics’ tools
TEMPORARY HEATING ORCOOLING
If the unit is to be used for temporary heating or cooling, a
“Startup, Adjustments, and Checks” must first be performed
in accordance with this manual. Failure to comply with this
requirement will void the warranty. After the machines are
used for temporary heating or cooling, inspect the coils, fans,
and motors for unacceptable levels of construction dust and
dirt and install new filters.
CONTRACTOR RESPONSIBILITY
The installing contractor must be certain that:
• All supply and return air ductwork is in place and
corresponds with installation instructions.
• Allthermostatsaremountedandwiredinaccordance
with installation instructions.
• All electric power, all gas, hot water or steam line
connections, and the condensate drain installation
havebeenmade to each unit onthejob. These main
supply lines must be functional and capable of
operating all units simultaneously.
ROOF CURB INSTALLATION CHECK
Inspectthe roof curb forcorrect installation.The unitand curb
assembly should be level. Inspect the flashing of the roof
mounting curb to the roof, especially at the corners, for good
workmanship.Also check forleaksaround gaskets. Note any
deficiencies in a separate report and forward to the contrac-
tor.
OBSTRUCTIONS, FAN CLEARANCE AND WIRING
Remove any extraneous construction and shipping materi-
als that may be found during this procedure. Rotate all fans
manually to check for proper clearances and that they rotate
freely. Check for bolts and screws that may have jarred loose
during shipment to the jobsite. Retighten if necessary. Re-
tighten all electrical connections.
PRE-STARTUP PRECAUTIONS
It is important to your safety that the unit has been properly
grounded during installation. Check ground lug connection
inmain controlboxfor tightnessprior to closingcircuit breaker
or disconnect switch. Verify that supply voltage on line side
of disconnect agrees with voltage on unit identification plate
and is within the utilization voltage range as indicated inAp-
pendix C Electrical Data.

15
System Voltage - That nominal voltage value assigned to a
circuit or system for the purpose of designating its voltage
class.
Nameplate Voltage - That voltage assigned to a piece of
equipment for the purpose of designating its voltage class
and for the purpose of defining the minimum and maximum
voltage at which the equipment will operate.
Utilization Voltage - The voltage of the line terminals of the
equipment at which the equipment must give fully satisfac-
tory performance. Once it is established that supply voltage
will be maintained within the utilization range under all sys-
tem conditions, check and calculate if an unbalanced condi-
tion exists between phases. Calculate percent voltage un-
balance as follows:
Three Phase Models
3) PERCENT VOLTAGE
UNBALANCE
2) MAXIMUM VOLTAGE DEVIATIONS
FROM AVERAGE VOLTAGE
1) AVERAGE VOLTAGE
HOW TO USE THE FORMULA:
EXAMPLE: With voltage of 220, 216, and 213
1) Average Voltage = 220+216+213=649 / 3 = 216
2) Maximum Voltage Deviations from Average Voltage = 220 - 216 = 4
3) Percent Voltage Unbalance = 100 x = = 1.8%
Percent voltage unbalance MUST NOT exceed 2%.
4
216 400
216
= 100 X
FIELD DUCT CONNECTIONS
Verify that all duct connections are tight and that there is no
air bypass between supply and return.
CONTROL VOLTAGE CHECK
With disconnect switch in the open “OFF” position, discon-
nect blue wire from low voltage transformer TRANS1. Close
the disconnect switch to energize TRANS1 control trans-
former. Check primary and secondary (24V) of control trans-
former TRANS1.
THERMOSTAT PRELIMINARY CHECK
Withdisconnect switchopenand bluewire disconnected from
TRANS1 transformer, attach one lead of ohmmeter to termi-
nal R on TB1 terminal block. Touch, in order, the other ohm-
meter lead to terminals Y1, Y2 and G at TB1 terminal block.
There must be continuity from terminal R to terminals Y and
G. R to Y indicates cool. R to G indicates fan (auto). Replace
blue wire on TRANS1 transformer.
FILTER SECTION CHECK
Remove filter section access panels and check that filters
are properly installed. Note airflow arrows on filter frames.
BEARING CHECK
Prior to energizing any fans, check and make sure that all
setscrews are tight so that bearings are properly secured to
shafts.
SET EVAPORATOR FAN RPM
Actual RPM’s must be set and verified with a tachometer or
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
terminals Y and W. This will prevent heating and mechanical
cooling from coming on. Place a jumper wire across termi-
nals R and G at TB1 terminal block. Close disconnect switch;
evaporator fan motor will operate so RPM can be 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 (see Appendix A - Blower Performance).
TENSION AND ALIGNMENT ADJUSTMENT
Correct belt tension is very important to the life of your belt.
Too loose a belt will shorten its life; too tight, premature mo-
tor and bearing failure will occur. Check you belt drive for
adequate“run-in” belttension bymeasuring theforcerequired
to deflect the belt at the midpoint of the span length. Belt
tension force can be measured using a belt tension gauge,
available through most belt drive manufacturers.
t = Span length, inches
C = Center distance, inches
D = Larger sheave diameter, inches
d = Smaller sheave diameter, inches
h = Deflection height, inches
DRIVE BELT TENSION ADJUSTMENT
MODEL SHEAVE DIAMETER
(in)
DEFLECTION
(in)
BELT DRIVE Used New
15 Ton B, BA Standard 4.3 to 5.5 5.5 + .5 8.2 + .5 1/4 ± 1/16
15 Ton B, BA High
Static 4.3 to 5.5 5.5 + .5 8.2 +.5 1/4 ± 1/16
20 Ton B, BA Standard 4.3 to 5.5 5.5 + .5 8.2 + .5 1/4 ± 1/16
20 Ton B, BA High
Static 4.3 to 5.5 5.5 + .5 8.2 +.5 1/4 ± 1/16
DEFLECTION
FORCE (lbs)
TYPE
RECOMMENDED POUNDS OF FORCE PER BELT
The correct deflection force is 5 Ibs. for a new belt and 3.5
Ibs. for a belt that has been run in. New belt tension includes
initial belt stretch. When new V-belts are installed on a drive
the initial tension will drop rapidly during the first few hours.

16
Check tension frequently during the first 24 hours of opera-
tion. Subsequent retensioning should fall between the mini-
mum and maximum force. To determine the deflection dis-
tance from the normal position, use a straightedge or stretch
a cord from sheave to sheave to use as a reference line. On
multiplebelt drives, an adjacentundeflectedbelt can be used
as a reference.
EVAPORATOR FAN ROTATION CHECK (THREE PHASE MODELS
ONLY)
Check that fan rotates clockwise when viewed from the drive
side of unit and in accordance with rotation arrow shown on
blowerhousing. Ifit doesnot, reverseany twoincomingpower
cablesatSinglePoint Power Block. In this case, repeat bear-
ing check.
Do not attempt to change load side wiring. Internal wiring
assures all motors and compressors will rotate in correct di-
rection once evaporator fan motor rotation check has been
made.
ELECTRICAL INPUT CHECK
Make preliminary check of evaporator fan ampere draw and
verify that motor nameplate amps are not exceeded. A final
check of amp draw should be made upon completion of air
balancing of the duct system (see Appendix C).
RESTORING CONNECTIONS
With disconnect switch open, remove jumper wire from ter-
minals R and G at TB1 terminal block, and reconnect ther-
mostat wires to terminals Y and W.
REFRIGERATION SYSTEM CHECKS
Ensure the hold-down bolts on the compressor are secure
and have not vibrated loose during shipment. Check that vi-
bration grommets have been installed. Visually check all pip-
ing and clamps. The entire refrigeration system has been
factory charged and tested, making it unnecessary to field
charge. Factory charges are shown in Appendix C and on
the unit nameplate.
Install service manifold hoses. Gauges should read satura-
tionpressurecorresponding to ambient temperature.Charge
should be checked to obtain 12° to 15° of sub-cooling per
system (i.e. compressor circuits).
Rollout Protection Control
The rollout protection device opens, cutting power to the
gas valve, if the flames from the burners are not properly
drawn into the heat exchanger. The rollout protection
device is located above the burner bracket (See page
19). The reason for elevated temperatures at the control
should be determined and repaired prior to resetting this
manual reset control.
T O  AVOID  PROPERTY  DAMAGE , PERSONAL  INJURY  OR  DEATH  DUE  TO 
FIRE  OR  EXPLOSION , A  QUALIFIED  SERVICER  MUST  INVESTIGATE  THE 
REASON  FOR  THE  ROLLOUT  PROTECTION  DEVICE  TO  OPEN  BEFORE 
MANUALLY  RESETTING  THE  ROLLOUT  PROTECTION  DEVICE .
WARNING
Secondary Limit Control
Thesecondary limitcontrol islocatedon theside ofthe blower
scroll assembly. This control opens when elevated tempera-
tures are sensed. Elevated temperatures at the control are
normally caused by blower failure. The reason for the open-
ing should be determined and repaired prior to resetting.
If the power to the unit is interrupted during the heating cycle,
itmay cause thesecondarylimit to trip.Once the blowercom-
partment temperature drops below the limit reset tempera-
ture, the limit will automatically reset.
Pre-Operation Checks
1. Close the manual gas valve external to the unit.
2. Turn off the electrical power supply to the unit.
3. Set theroomthermostat toits lowestpossiblesetting.
4. Remove the heat exchanger door on the side of the
unit by removing screws.
5. This unit is equipped with an ignition device which
automatically lights the main burner. DO NOT try to
light burner by any other method.
6. Move thegas controlvalveswitch tothe OFF position.
Do not force.
7. Wait five minutes to clear out any gas.
8. Smell for gas, including near the ground. This is
importantbecause sometypesofgasareheavierthan
air. If you have waited five minutes and you do smell
gas, immediately follow the warnings on page 3 of
this manual. If having waited for five minutes and no
gas smell is noted, move the gas control valve switch
to the ON position.
9. Replace the heat exchanger door on the side of the
unit.
10.Open the manual gas valve external to the unit.
11. Turn on the electrical power supply to the unit.
12.Set the thermostat to desired setting.
Gas Supply And Manifold Check
Gas supply pressure and manifold pressure with the burners
operating must be as specified on the rating plate.
Gas Inlet Pressure Check
Gas inlet pressure must be checked and adjusted in accor-
dance to the type of fuel being consumed.
With Power And Gas Off:
1. Connect a water manometer or adequate gauge to
the inlet pressure tap of the gas valve.
Inletgas pressure canalsobe measured byremoving
thecapfrom the dripleg and installinga predrilled cap
with a hose fitting.

17
With Power And Gas On:
2. Put unit into heating cycle and turn on all other gas
consuming appliances.
NATURAL Min. 5.0" W.C., Max. 10.0" W.C.
PROPANE Min. 11.0"W.C., Max. 14.0" W.C.
INLETGAS PRESSURE
NOTE: Inlet Gas Pressure Must Not Exceed the Maximum
Value Shown.
If operating pressures differ from above, make necessary
pressure regulator adjustments, check piping size, etc., and/
or consult with local utility.
Manifold Pressure Check
The gas valve has a tapped opening to facilitate measure-
ment of the manifold pressure. A “U” Tube manometer hav-
ing a scale range from 0 to 12 inches of water should be
used for this measurement. The manifold pressure must be
measured with the burners operating.
Toadjust thepressure regulator,removetheadjustment screw
or cover on the gas valve. Turn out (counterclockwise) to
decrease pressure, turn in (clockwise) to increase pressure.
Only small variations in gas flow should be made by means
of the pressure regulator adjustment. In no case should the
final manifold pressure vary more than plus or minus 0.3
inches water column from the specified nominal pressure.
Any major changes in flow should be made by changing the
size of the burner orifices. The measured input rate to the
furnace must not exceed the rating specified on the unit rat-
ing plate.
For natural gas, the manifold pressure must be between 3.2
and 3.8 inches w.c. (3.5 nominal) for high fire and between
1.7 and 2.3 inches w.c. (2.0 nominal) for low fire.
For propane gas, the manifold pressure must be between
9.7 and 10.3 inches w.c. (10.0 nominal) for high fire and be-
tween 6.7 and 7.3 inches w.c. (7.0 nominal) for low fire.
Gas Input (Natural Gas Only) Check
To measure the gas input use a gas meter and proceed
as follows:
1. Turn off gas supply to all other appliances except the
unit.
2. With the unit operating, time the smallest dial on the
meter for one complete revolution. If this is a 2 cubic
foot dial, divide the seconds by 2; if it is a 1 cubic foot
dial, use the seconds as is. This gives the seconds
per cubic foot of gas being delivered to the unit.
3. INPUT=GAS HTGVALUE x 3600 /SEC. PER CUBIC
FOOT
Example: Natural gas with a heating value of 1000 BTU per
cubic foot and 34 seconds per cubic foot as determined by
Step 2, then:
Input = 1000 x 3600 / 34 = 106,000 BTU per Hour.
NOTE: BTU content of the gas should be obtained
from the gas supplier. This measured input must not
be greater than shown on the unit rating plate.
4. Relight all other appliances turned off in step 1. Be
sure all pilot burners are operating.
Main Burner Flame Check
Flames should be stable, soft and blue (dust may cause or-
ange tips but they must not be yellow) and extending directly
outward from the burner without curling, floating or lifting off.
Temperature Rise Check
Check the temperature rise through the unit by placing ther-
mometers in supply and return air registers as close to the
unit as possible. Thermometers must not be able to sample
temperature directly from the unit heat exchangers, or false
readings could be obtained.
1. All registers must be open; all duct dampers must be
in their final (fully or partially open) position and the
unit operated for 15 minutes on HIGH FIRE before
taking readings.
2. The temperature rise must be within the range
specified on the rating plate.
NOTE: Air temperature rise is the temperature difference
between supply and return air.
With a properly designed system, the proper amount of tem-
perature rise will normally be obtained when the unit is oper-
ated at rated input with the recommended blower speed.
If the correct amount of temperature rise is not obtained, it
may be necessary to change the blower speed. A higher
blowerspeedwilllower the temperature rise.Aslower blower
speed will increase the temperature rise.
NOTE: Blower speed MUST be set to give the correct air
temperature rise through the unit as marked on the rating
plate.
REFRIGERATION SEQUENCE CHECK
With the disconnect switch open, remove the field connected
thermostat wire from terminal R onTB1 terminal block. Place
a jumper across terminals R and G, and across R and Y on
TB1 terminal block. Close the disconnect switch. The follow-
ing operational sequence should be observed.
1. Current through primary winding of transformer
TRANS1 energizes the 24-volt control circuit.
2. To simulate amechanical call for coolingfrom the wall
thermostat, place a jumper across terminals R and
Y1 of terminal block TB1.
3. UNIT WITH ECONOMIZER OPTION: The
compressor circuit is interlocked through terminals 3
and 4 of the economizer module. If the outdoor air
enthalpy (temperature and humidity) is not suitable
for cooling, the economizer terminals will be closed
permitting compressor to be energized.

18
4. The beltdriveblower contactorcloses itscontactsL1,
L2 and L3 to T1, T2 and T3 to provide power to the
supply fan motor.
5. Check supply fan rotation. If the supply fan is rotating
in the wrong direction, disconnect and lock off Single
Point Power Block. Do not attempt to change load
sidewiring.Internal wiringis setatthe factorytoassure
that the supply fan and compressors all rotate in the
proper direction. Verification of correct supply fan
rotation at initial startup will also indicate correct
compressor rotation. Reconnect power and check for
proper operation.
6. Compressor contactor closes its contacts L1, L2 and
L3 to T1, T2 and T3 to provide power to the
compressor motor COMP 1; COMP 2, if conditions
arecorrect. Inaddition,contactorC1 closesitscontact
L3 to T3 , energizing the condenser fan motor.
BURNHAZARD! 
DONOTTOUCH!DISCHARGELINEMAYBEHOT!
WARNING
7. Check that each compressor is operating correctly.
The scroll compressors in these units MUST operate
in the proper rotation.To ensure the compressors are
operating in the correct direction, check the
compressor discharge line pressure or temperature
after each compressor is started.
The discharge pressure and discharge line
temperature should increase. If this does not occur
and the compressor is producing an exceptional
amount of noise, perform the following checks.
• Ensure all compressors and the supply fan motor
are operating in the proper direction. If a single
motor is operating backwards, check the power
wiring for that motor and correct any leads that
have been interchanged at the contactor or at the
motor.
• If all of the motors are operating backward,
disconnect the unit power supply and lock it in the
“OFF” position. Switch two leads of the power
supply at the unit Single Point Power Block.
Reconnect power and check for compressor and
supply fan motor operation.
8. With allsafety devicesclosed, thesystem willcontinue
cooling operation until the thermostat is satisfied.
9. Disconnecting thejumper wire betweenRandY1and
Y2 and between R and G on TB1 terminal block will
simulatea satisfied thermostat. Thecompressors will
cycle off and IIC (pin 12) will initiate its time delay
cycle. The compressor and the supply fan will cycle
off.
10.After a time delay of approximately 3 minutes, the
compressor control circuits will be ready to respond
to a subsequent call for cooling from the wall
thermostat.
11. Open disconnect switch. Reconnect the field
thermostat wire at terminal R on terminal block TB1.
REFRIGERATION PERFORMANCE CHECK
Under normal summertime (full load) operating conditions,
superheat should be between 8°F and 12°F and sub-cooling
measured at the condenser outlet should be 15°F (nominal).
A 25°F to 35°F temperature difference should exist between
the entering condenser air and the temperature correspond-
ing to the compressor saturated discharge pressure. Check
that compressor RLA corresponds to values shown in Ap-
pendix C. RLA draw can be much lower than values listed at
low load conditions and low ambient condensing tempera-
tures. Values in Appendix C can slightly exceed at high load
conditions and high ambient condensing temperatures.
GAS SUPPLY PRESSURES & REGULATOR ADJUSTMENTS
S HOULD  OVERHEATING  OCCUR  OR  THE  GAS  SUPPLY  FAIL  TO  SHUT  OFF ,
TURN  OFF  THE  MANUAL  GAS  SHUTOFF  VALVE  EXTERNAL  TO  THE  UNIT 
BEFORE  TURNING  OFF  THE  ELECTRICAL  SUPPLY .
WARNING
T O  AVOID  PROPERTY  DAMAGE , PERSONAL  INJURY  OR  DEATH , DO  NOT 
FIRE  GAS  UNIT  WITH  FLUE  BOX  COVER  REMOVED .
WARNING
NOTE: Except during brief periods when gas pressures are
being measured by qualified service personnel, the furnace
access panel must always be secured in place when the
furnaceis in operation.Aninspectionport in theaccesspanel
is provided to monitor the flame.
The first step in checking out the gas-fired furnace is to test
the gas supply piping to the unit for tightness and purge the
system of air using methods outlined in the latest edition of
the National Fuel Gas Code ANSI Z223.1. Verify that the
disconnect switch is in the “OFF” position. A soapy water
solution should be used to check for gas leaks. Since the unit
is subject to considerable jarring during shipment, it is ex-
tremelyimportant thatall gas connectionsand jointsbetested
fortightness. Gaspipingdownstreamfromtheunitinletshould
bechecked for leaksduringthe subsequent sequencecheck.
The supply gas pressure should be adjusted to 7.0" w.c. on
natural gas and 11.0" on LP gas with the gas burners operat-
ing. If there is more than one unit on a common gas line, the
pressures should be checked with all units under full fire. A
supply pressure tap is provided on the upstream side of the
gas valve. A manifold pressure tap is provided on the mani-
fold. The normal manifold pressure for full input is 3.5" w.c.
on natural gas and 10.0" w.c. for propane gas. Minimum gas
supply pressure is 5.5" w.c. for natural gas and 11.0" for pro-
pane gas. In order to obtain rating, gas supply pressure must
be 11.0" w.c. for propane gas.

19
Thepressure regulatoronLP gasmodels isadjustedfor 10.0"
w.c. manifold pressure and is intended to prevent over-firing
only. Do not attempt adjustment of the built-in pressure regu-
lator unless the supply pressure is at least 7.0" w.c. on natu-
ral gas or 14.0" w.c. on propane gas. Check the location of
the ignition electrode and the flame sensor for correct gap
setting.
Flame
Sensor
Ignitor
NATURAL PROPANE (LP)
400,000 8 50,000 #30 #48
GAS ORIFICES
MAXIMUM
INPUT
(BTUH)
NUMBER
of
BURNERS
MAXIMUM
BTUH/BURNER
HEAT EXCHANGER AND BURNER ORIFICE SPECIFICATIONS
NOTE: Gas appliances located more than 2000 feet above
sea level must be derated 4% per 1000 feet of total elevation
and that variance in gas heating value and specific gravity
require change in manifold pressure to obtain rating, it is
mandatory that the input be adjusted at the installation site.
Allinstallationsshould bemade asoutlined inthe latestedition
of the National Fuel Gas Code ANSI Z223.1, section
“Procedures To Be Followed To Place An Appliance in
Operation”. Refer also to the “User’s Information Manual”
supplied with the unit for additional information on the gas
furnace.
Unit Shutdown
1. Set the thermostat to lowest setting.
2. Turn off the electrical power supply to the unit.
3. Remove the heat exchanger door on the side of the
unit by removing screws.
4. Move thegas controlvalveswitch tothe OFF position.
Do not force.
5. Close manual gas shutoff valve external to the unit.
6. Replace the heat exchanger door on the unit.
7. If cooling and/or air circulation will be desired, turn
ON the electrical power.
NORMAL SEQUENCE OF OPERATION
HEATING
This unit has one (RS) Manual Reset Limit Control Switch.
Check the limit to make sure it has not tripped. The limit may
arrive at the job site tripped as a result of shipping shock.
If the ventor motor comes on, but the unit does not attempt
ignition, check if the ALS (Automatic Reset High Limit Con-
trol Switch) requires resetting.
1. With electricity and gas turned on, the system switch
in the “HEAT” or “AUTO” position and the fan switch
in the “AUTO” position, the thermostat will close the
circuit between unit terminals R and W (R-W) when
the temperature falls below the thermostat setting.
2. D1 on IIC energizes relay IDMR.
3. Relay IDMR energizes the ventor motor IDM.
4. Operation ofthe ventmotor closesthepressureswitch
PS located in the burner compartment. the control
then initiates a 15-second pre-purge time delay.
During this period, the ventor motor will clear the
combustion chamber of any residual gas.
5. After the pre-purge period, the ignition control
energizes the Wl-C gas valve and simultaneously
initiates a “three (3)-try” spark ignition sequence.
6. When the burners are ignited, a minimum four (4)
micro-amp DC current will flow through the flame
between the sensor electrode and the grounded
burner.
7. When the controller proves that the flame has been
established, it will keep the gas valve energized and
discontinue the ignition spark. First stage manifold
pressure will be approximately 2.0" w.c. for natural
gas and 7.0" w.c. for propane (LP).
8. If the control is unable to ignite the burners after its
initial attempt, it will initiate another purge and spark
sequence. A third purge and spark sequence will be
initiated if the second attempt is unsuccessful. If the
third attempt is unsuccessful, the controller will close
the gas valve and lock itself out. It may be reset by
momentarily interrupting power. This may be
accomplishedby briefly lowering theroom thermostat
set-point below room temperature, or by shutting off
the main power to the unit. (See TP-105 for more
details.)
9. Integrated ignition control will close its normally open
contacts after a delay of approximately 30 seconds.
This action energizes contactor BC and starts the
supply fan motor. Operation of the supply fan
circulates air across the heat exchanger and delivers
heated air to the conditioned space.
10.When the space temperature rises, the thermostat
will open R-W. Opening R-W will cause the gas valve
to close, and the furnace to shut down.
11. The furnacehas three hightemperaturelimit controls,
which can shut down the burner. They do not shut
down the ventor motor.

20
AUTOMATIC RESET HIGH LIMIT CONTROL (LS)
Located in the burner compartment on the heat exchanger,
its sensing element projects through the blower section bulk-
head and senses the temperature at the rear of the furnace.
It will cycle the furnace off if the temperature exceeds 100°F
plus maximum rise.
AUTOMATIC RESET HIGH LIMIT CONTROL (ALS)
Located in the blower compartment on the blower housing, it
senses air temperature within the blower compartment and
protects the filters from excessive temperature. It will shut
down the furnace if it senses excessive temperatures.
MANUAL RESET FLAME ROLLOUT CONTROL (RS)
Located in the burner compartment at the top of the burner
assembly, it senses high temperature that could occur if the
heat exchanger tubes were plugged and the flame was roll-
ing out instead of entering the tubes. It has a manual push-
button reset that cannot be actuated until the limit control has
cooled.
TROUBLESHOOTING
IGNITION CONTROL ERROR CODES
The following presents probable causes of questionable unit
operation. Refer to Diagnostic Indicator Chart for an inter-
pretation of the signal and to this section for an explanation.
Remove the control box access panel and note the number
ofdiagnostic LEDflashes. RefertoDiagnosticIndicator Chart
for an interpretation of the signal and to this section for an
explanation.
ABNORMAL OPERATION - HEATING
Internal Control Failure
If the integrated ignition control in this unit encounters an in-
ternal fault, it will go into a “hard” lockout and turn off the
diagnostic LED. If diagnostic LED indicates an internal fault,
checkpower supply tounitfor proper voltage,check allfuses,
circuit breakers and wiring. Disconnect electric power for
five seconds. If LED remains off after restoring power, re-
place control.
External Lockout
An external lockout occurs if the integrated ignition control
determines that a measurable combustion cannot be estab-
lished within three (3) consecutive ignition attempts. If flame
is not established within the seven (7) second trial for igni-
tion,the gasvalveisdeenergized,15secondinter-purgecycle
is completed, and ignition is reattempted. The control will
repeat this routine three times if a measurable combustion is
not established. The control will then shut off the induced
draft blower and go into a lockout state.
If flame is established but lost, the control will energize the
circulator blower at the heat speed and then begin a new
ignition sequence. If flame is established then lost on subse-
quent attempts, the control will recycle for four (4) consecu-
tive ignition attempts (five attempts total) before locking out.
The diagnostic fault code is 1 flash for a lockout due to failed
ignition attempts or flame dropouts. The integrated control
will automatically reset after one hour, or it can be reset by
removing the thermostat signal or disconnecting the electri-
cal power supply for over five seconds. If the diagnostic LED
indicates an external lockout, perform the following checks:
•Check the supply and manifold pressures
•Check the gas orifices for debris
•Check gas valve for proper operation
•Check secondary limit
A dirty filter, excessive duct static, insufficient air
flow, a faulty limit, or a failed circulator blower can
causethis limitto open. Checkfilters,totalexternal
duct static, circulator blower motor, blower motor
speed tap (see wiring diagram), and limit. An
interruption in electrical power during a heating
cycle may also cause the auxiliary limit to open.
The automatic reset secondary limit is located on
top of the circulator blower assembly.
•Check rollout limit
If the burner flames are not properly drawn into
the heat exchanger, the flame rollout protection
device will open. Possible causes are restricted
orblockedflue passages, blocked orcrackedheat
exchanger, a failed induced draft blower, or
insufficient combustion air. The rollout protection
deviceis a manualreset limit locatedonthe burner
bracket. The cause of the flame rollout must be
determinedand correctedbefore resettingthe limit.
•Check flame sensor
A drop in flame signal can be caused by nearly
invisiblecoating onthesensor. Remove thesensor
and carefully clean with steel wool.
•Check wiring
Check wiring for opens/shorts and miswiring.
IMPORTANT: If you haveto frequentlyresetyour gas/electric
package unit, it means that a problem exists that should be
corrected. Contacta qualifiedservicerfor furtherinformation.
Pressure Switch Stuck Open
Apressureswitch stuck open canbe caused by a faultypres-
sure switch, faulty wiring, a disconnected or damaged hose,
a blocked or restricted flue, or a faulty induced draft blower.
If the control senses an open pressure switch during the pre-
purge cycle, the induced draft blower only will be energized.
If the pressure switch opens after ignition has begun the gas
valve is deenergized, the circulator blower heat off cycle be-
gins, and the induced draft blower remains on. The diagnos-
tic fault code is two flashes.
Pressure Switch Stuck Closed
A stuck closed pressure switch can be caused by a faulty
pressure switch or faulty wiring. If the control encounters a
pressure switch stuck closed, the induced draft blower re-
mains off. The diagnostic LED code for this fault is three (3)
flashes.