Rheem RRNA-B SERIES User manual

92-21916-28-03
SUPERSEDES 92-21916-28-02
PACKAGE GAS ELECTRIC
RRNA-B SERIES (2-5 TONS)
INSTALLATION INSTRUCTIONS
ISO 9001:2000

2
I.TABLE OF CONTENTS
I. Table of Contents ..................................................................................................2
II. Introduction............................................................................................................3
III. Checking Product Received ..................................................................................3
IV. Specifications ........................................................................................................3
A. General .............................................................................................................3
B. Major Components............................................................................................3
V. Safety Information .................................................................................................4
VI. Unit Dimensions ....................................................................................................5
VII. Installation .............................................................................................................7
A. General .............................................................................................................7
1. Pre-Installation Check ..................................................................................7
2. Location Considerations...............................................................................7
B. Outside Installation............................................................................................8
C. Attaching Exhaust and Combustion Air Inlet Hoods .........................................9
D. Cover Panel Installation/Conversion Procedure ...............................................9
1. Horizontal to Downflow .................................................................................9
2. Downflow to Horizontal .................................................................................9
E. Clearances ......................................................................................................11
F. Rooftop Installation .........................................................................................13
G. Ductwork .........................................................................................................13
H. Return Air ........................................................................................................14
I. Filters ..............................................................................................................14
VIII. Gas Supply, Condensate Drain and Piping .........................................................16
A. Gas Connection ..............................................................................................16
B. LP Conversion.................................................................................................17
C. NOx Models ....................................................................................................18
D. Adjusting or Checking Furnace Input ..............................................................18
E. Condensate Drain ...........................................................................................19
IX. Wiring ..................................................................................................................19
A. Power Supply ..................................................................................................19
B. Hook Up ..........................................................................................................21
C. Internal Wiring .................................................................................................21
D. Thermostat ......................................................................................................21
X. Furnace Section Controls and Ignition System ...................................................22
Normal Furnace Operating Sequence.................................................................22
Operating Instructions .........................................................................................23
Burners ................................................................................................................24
Manual Reset Overtemperature Control..............................................................24
Pressure Switch...................................................................................................24
Limit Control ........................................................................................................24
XI. System Operating Information.............................................................................24
Advise the Customer ...........................................................................................24
Furnace Section Maintenance.............................................................................24
Lubrication ...........................................................................................................25
Cooling Section Maintenance..............................................................................26
Replacement Parts ..............................................................................................27
Troubleshooting...................................................................................................27
Wiring Diagrams ..................................................................................................27
Charging ..............................................................................................................27
Blower Motor Speed Taps ...................................................................................27
XII. General Data ..................................................................................................29-41
XIII. Miscellaneous......................................................................................................42
Electrical Data ....................................................................................................42
Airflow Performance .......................................................................................43-44
Wiring Diagrams.............................................................................................45-49
Charge Charts ................................................................................................50-55
Troubleshooting..............................................................................................56-57

3
II. INTRODUCTION
This booklet contains the installation and operating instructions for your combination gas
heating/electric cooling unit. There are some precautions that should be taken to derive
maximum satisfaction from it. Improper installation can result in unsatisfactory operation
or dangerous conditions.
Read this booklet and any instructions packaged with separate equipment required to
make up the system prior to installation. Give this booklet to the owner and explain its
provisions. The owner should retain this booklet for future reference.
III. CHECKING PRODUCT RECEIVED
Upon receiving the unit, inspect it for any damage from shipment. Claims for damage,
either shipping or concealed, should be filed immediately with the shipping company.
IMPORTANT: Check the unit model number, heating size, electrical characteristics, and
accessories to determine if they are correct.
IV. SPECIFICATIONS
A. GENERAL
The Combination Gas Heating/Electric Cooling Rooftop is available in 40,60, 80 and 100
BTU/Hr. heating inputs and cooling capacities of 11⁄2, 2, 21⁄2, 3, 31⁄2 , 4 and 5 nominal tons
of cooling. Units are convertible from end supply and return to bottom supply and return
by relocation of supply and return air access panels. See cover installation detail.
The units are weatherized for mounting outside of the building.
The information on the rating plate is in compliance with the FTC and DOE rating for sin-
gle phase units. The following information is for three phase units which are not covered
under the DOE certification program.
1. The energy consumption of the ignition system used with this unit is 9 watts.
2. The efficiency rating of this unit is a product thermal efficiency rating determined
under continuous operating conditions independent of any installed system.
B. MAJOR COMPONENTS
The unit includes a hermetically-sealed refrigerating system (consisting of a compressor,
condenser coil, evaporator coil with capillary tube assembly), a circulation air blower, a
condenser fan, a heat exchanger assembly, gas burner and control assembly, combus-
tion air motor and fan, and all necessary internal electrical wiring. The cooling system of
these units is factory-evacuated, charged and performance tested. Refrigerant amount
and type are indicated on rating plate.
!WARNING
THE MANUFACTURER’S WARRAN-
TY DOES NOT COVER ANY DAM-
AGE OR DEFECT TO THE AIR CON-
DITIONER CAUSED BY THE
ATTACHMENT OR USE OF ANY
COMPONENTS, ACCESSORIES OR
DEVICES (OTHER THAN THOSE
AUTHORIZED BY THE MANUFAC-
TURER) INTO, ONTO OR IN CON-
JUNCTION WITH THE AIR CONDI-
TIONER. YOU SHOULD BE AWARE
THAT THE USE OF UNAUTHO-
RIZED COMPONENTS, ACCES-
SORIES OR DEVICES MAY
ADVERSELY AFFECT THE OPERA-
TION OF THE AIR CONDITIONER
AND MAY ALSO ENDANGER LIFE
AND PROPERTY. THE MANUFAC-
TURER DISCLAIMS ANY RESPON-
SIBILITY FOR SUCH LOSS OR
INJURY RESULTING FROM THE
USE OF SUCH UNAUTHORIZED
COMPONENTS, ACCESSORIES OR
DEVICES.
!WARNING
UNITS ARE NOT DESIGN CERTIFIED TO BE INSTALLED INSIDE THE STRUC-
TURE. DOING SO CAN CAUSE INADEQUATE UNIT PERFORMANCE AS WELL
AS PROPERTY DAMAGE AND CARBON MONOXIDE POISONING RESULTING
IN PERSONAL INJURY OR DEATH.

4
V. SAFETY INFORMATION
!WARNING
DO NOT USE THIS UNIT DURING CONSTRUCTION IF AIR LADEN CORROSIVE
COMPOUNDS ARE PRESENT SUCH AS CHLORINE AND FLUORINE. OTHER-
WISE, PROVISIONS MUST BE TAKEN TO PROVIDE CLEAN, UNCONTAMINAT-
ED COMBUSTION AND VENTILATION AIR TO THE UNIT. COMBUSTION AND
VENTILATION AIR CONTAMINATED WITH THESE COMPOUNDS FORMS
ACIDS DURING COMBUSTION WHICH CORRODES THE HEAT EXCHANGER
AND COMPONENT PARTS. SOME OF THESE CONTAMINANTS ARE FOUND
IN, BUT NOT LIMITED TO, PANELING, DRY WALL, ADHESIVES, PAINTS,
STAINS, VARNISHES, SEALERS, AND MASONRY CLEANING MATERIALS.
!WARNING
USE ONLY WITH TYPE OF GAS APPROVED FOR THIS UNIT. REFER TO THE
UNIT RATING PLATE.
!WARNING
INSTALL THIS UNIT ONLY IN A LOCATION AND POSITION AS SPECIFIED IN
THE LOCATION REQUIREMENTS AND CONSIDERATIONS SECTION OF
THESE INSTRUCTIONS. PROVIDE ADEQUATE COMBUSTION AND VENTILA-
TION AIR TO THE UNIT SPACE AS SPECIFIED IN THE VENTING SECTION OF
THESE INSTRUCTIONS.
!WARNING
PROVIDE ADEQUATE COMBUSTION AND VENTILATION AIR TO THE UNIT
SPACE AS SPECIFIED IN THE COMBUSTION AND VENTILATION AIR SECTION
OF THESE INSTRUCTIONS.
!WARNING
COMBUSTION PRODUCTS MUST BE DISCHARGED OUTDOORS. CONNECT
THIS UNIT TO AN APPROVED VENT SYSTEM ONLY, AS SPECIFIED IN VENT
PIPE INSTALLATION SECTION OF THESE INSTRUCTIONS.
!WARNING
NEVER TEST FOR GAS LEAKS WITH AN OPEN FLAME. USE A COMMERCIAL-
LY AVAILABLE SOAP SOLUTION MADE SPECIFICALLY FOR THE DETECTION
OF LEAKS TO CHECK ALL CONNECTIONS, AS SPECIFIED IN GAS SUPPLY
AND PIPING SECTION OF THESE INSTRUCTIONS.
!WARNING
ALWAYS INSTALL UNIT TO OPERATE WITHIN THE UNIT'S INTENDED TEM-
PERATURE-RISE RANGE WITH A DUCT SYSTEM WHICH HAS AN EXTERNAL
STATIC PRESSURE WITHIN THE ALLOWABLE RANGE, AS SPECIFIED IN
DUCTING SECTION OF THESE INSTRUCTIONS. SEE ALSO UNIT RATING
PLATE.
!WARNING
WHEN A UNIT IS INSTALLED SO THAT SUPPLY DUCTS CARRY AIR CIRCU-
LATED BY THE UNIT TO AREAS OUTSIDE THE SPACE CONTAINING THE
UNIT, THE RETURN AIR SHALL ALSO BE HANDLED BY DUCT(S) SEALED TO
THE UNIT CASING AND TERMINATING OUTSIDE THE SPACE CONTAINING
THE UNIT.

5
VI. UNIT DIMENSIONS
FOR CLEARANCES
SEE FIGURE 9.
OUTDOOR COIL
PROTECTIVE GRILLE
OUTDOOR FAN GRILLE
AND COMPRESSOR ACCESS
FIELD CONTROL
WIRE ENTRANCE
FLUE EXHAUST
HOOD
COMBUSTION AIR
INLET HOOD
BOTTOM
RETURN
DUCT
OPENING
BOTTOM
SUPPLY
DUCT
OPENING
OUTDOOR FAN
GRILLE & COMPRESSOR
ACCESS
BLOWER/EVAPORATOR
ACCESS PANEL SIDE SUPPLY DUCT
OPENING
SIDE
RETURN
DUCT
OPENING
FLUE
EXHAUST
FIELD POWER
WIRE ENTRANCE
LIQUID PRESSURE
SERVICE PORT
THREADED
PVC CONDENSATE
DRAIN CONNECTION
(3/4 NPT)
SUCTION PRESSURE
SERVICE PORT
TOP VIEW BOTTOM VIEW
FIGURE 1
479⁄16”
5013⁄16”
313⁄16”
49⁄10”
33⁄16”
497⁄16”
INSIDE
11⁄2”
TYP.
141⁄4”
TYP.
13⁄16”
TYP.
451⁄16”
INSIDE
191⁄2”153⁄8”
30% ± 2%
29% ± 2%
20% ± 2%
21% ± 2%
CORNER WEIGHTS
% OF TOTAL UNIT
WEIGHT

6
FILTER ACCESS PANEL
(FOR UNIT MOUNTED FILTER
ACCESSORY)
SIDE
SUPPLY
DUCT
OPENING
SIDE
RETURN
DUCT
OPENING
OUTDOOR
COIL PROTECTIVE
GRILLE
FLUE
EXHAUST
HOOD
GAS
SUPPLY
ENTRANCE
BLOWER/
EVAPORATOR
ACCESS PANEL
SIDE VIEW
FRONT VIEW BACK VIEW
SIDE VIEW
FIGURE 1 (CONTINUED)
MODEL
B024, B030,
B036
B042, B048,
B060
“A” HEIGHT
35.91”
40.97”
SHOWN WITH DUCT COVERS REMOVED.
207⁄8”
227⁄8”
1315⁄16”
75⁄16”
2211⁄16”
471⁄2”
3515⁄16”
39⁄16”
3515⁄16”
131⁄4”
47⁄16”
81⁄2”
TYP.
143⁄16”
TYP.
133⁄4”
TYP.
47⁄8”
191⁄8”
15”
41
1015⁄16”
111⁄16”
527⁄16”

7
VII.INSTALLATION
A. GENERAL
1. INSTALLATION — Install this unit in accordance with The American National
Standard Z223.1-latest edition booklet entitled “National Fuel Gas Code,” and the
requirements or codes of the local utility or other authority having jurisdiction.
Additional helpful publications available from the “National Fire Protection
Association” are: NFPA-90A - Installation of Air Conditioning and Ventilating
Systems 1985 or latest edition. NFPA-90B - Warm Air Heating and Air Conditioning
Systems 1984.
These publications are available from:
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
NOTE: Remove wood shipping base before installing unit.
1. PRE-INSTALLATION CHECK-POINTS — Before attempting any installation,
carefully consider the following points:
Structural strength of supporting members
(Rooftop Installation)
Clearances and provision for servicing
Power supply and wiring
Gas supply and piping
Air duct connections and sizing
Drain facilities and connections
Location for minimum noise and vibration
2. LOCATION CONSIDERATIONS
The metal parts of this unit may be subject to rust or deterioration in adverse envi-
ronmental conditions. This oxidation could shorten the equipment’s useful life. Salt
spray, fog or mist in seacoast areas, sulphur or chlorine from lawn watering systems,
and various chemical contaminants from industries such as paper mills and petrole-
um refineries are especially corrosive.
If the unit is to be installed in an area where contaminants are likely to be a
problem, give special attention to the equipment location and exposure.
1. Avoid having lawn sprinkler heads spray directly on the unit cabinet.
2. In coastal areas locate the unit on the side of the building away from the water-
front.
3. Shielding by a fence or shrubs may give some protection.
4. Elevate the unit off its slab or base enough to allow air circulation and avoid hold-
ing water against the basepan.
!WARNING
DISCONNECT ALL POWER TO UNIT BEFORE STARTING MAINTENANCE.
FAILURE TO DO SO CAN CAUSE ELECTRICAL SHOCK RESULTING IN PER-
SONAL INJURY OR DEATH.
REGULAR MAINTENANCE WILL REDUCE THE BUILDUP OF CONTAMINANTS
AND HELP TO PROTECT THE UNIT’S FINISH.

8
1. Frequent washing of the cabinet, fan blade and coil with fresh water will remove
most of the salt or other contaminants that build up on the unit.
2. Regular cleaning and waxing of the cabinet with a good automobile polish will pro-
vide some protection.
3. Use a good liquid cleaner several times a year to remove matter that will not wash
off with water.
Several different types of protective coatings are offered in some areas. These coatings
may provide some benefit, but the effectiveness of such coating materials cannot be ver-
ified by the equipment manufacturer.
The best protection is frequent cleaning, maintenance and minimal exposure to
contaminants.
B. OUTSIDE INSTALLATION
(Typical outdoor slab installation is shown in Figure 2.)
1. Select a location where external water drainage cannot collect around unit.
2. Provide a slab sufficiently high enough above grade to prevent surface water from
entering the unit. Where snowfall is anticipated, mount the unit above the anticipat-
ed maximum snow depth for your area. The slab should be isolated from the foun-
dation wall.
3. Pitch the slab approximately 1⁄2” so that the unit will be pitched toward the drain. See
Figure 3.
4. The location of the unit should be such as to provide proper access for inspection
and servicing as shown in Figure 9.
!WARNING
THESE UNITS ARE DESIGNED CERTIFIED FOR OUTDOOR INSTALLATION
ONLY. INSTALLATION INSIDE ANY PART OF A STRUCTURE CAN RESULT IN
INADEQUATE UNIT PERFORMANCE AS WELL AS PROPERTY DAMAGE.
INSTALLATION INSIDE CAN ALSO CAUSE RECIRCULATION OF FLUE PROD-
UCTS INTO THE CONDITIONED SPACE RESULTING IN PERSONAL INJURY
OR DEATH.
2

9
5. Locate unit where operating sounds will not disturb owner or neighbors.
6. Locate unit so roof runoff water does not pour directly on the unit. Provide gutter or
other shielding at roof level. Do not locate unit in an area where excessive snow
drifting may occur or accumulate.
7. Where snowfall is anticipated, the height of the unit above the ground level must be
considered. Mount unit high enough to be above average area snowfall and to allow
combustion air to enter the combustion air inlet.
C. ATTACHING EXHAUST AND COMBUSTION AIR INLET HOODS
IMPORTANT: Do not operate this unit without the exhaust and combustion air inlet
hood properly installed. These hoods are shipped in a carton in the return air compart-
ment inside the unit and must be attached when the unit is installed. See Figure 4.
To attach exhaust and combustion air inlet hood:
1. Remove 3 screws securing filter access panel and remove filter access panel. For loca-
tion of filter access panel, see Figure 1.
2. Remove both exhaust and combustion air inlet hoods from their carton, located inside
the return air compartment.
3. Attach filter access panel.
4. Attach the combustion air inlet hood and the exhaust hood each with 4 screws as shown
in Figure 4. Screws are in parts bag shipped in the burner compartment.
5. Vent the unit using the flue exhaust hood, as supplied from the factory, without alteration
or addition. The only exception is with factory approved additions. Consult your local util-
ity or other authority having jurisdiction for accepted venting techniques.
D. COVER PANEL INSTALLATION/CONVERSION PROCEDURE
1.HORIZONTAL TO DOWNFLOW
a. Remove screws and covers from the supply and return bottom sections. NOTE:
Rotate the supply cover 90° and remove.
b. Install gasket (supplied with parts bag) around perimeter of cover on the insulated
side. See Figure 6.
c. Secure covers to the side of the unit using existing screws and those supplied in
the parts bag.
2.DOWNFLOW TO HORIZONTAL
a. Remove screws and covers from the supply and return bottom sections.
b. Install gasket (supplied with parts bag) around perimeter of cover as illustrated in
Figure 5.
FIGURE 3
PITCHING UNIT TO INSURE PROPER CONDENSATE DRAINAGE.
I655
FIGURE 4
COMBUSTION AIR INLET HOOD & EXHAUST HOOD
INSTALLATION
I250
EXHAUST
HOOD W/(4)
SCREWS
COMBUSTION
AIR INLET
HOOD W/(4)
SCREWS
LEVEL FRONT OF UNIT
LEVEL PLANE
CONDENSATE DRAIN CONNECTION
1/8 BUBBLE OFF LEVEL
THIS END APPROX.
1/2” HIGHER THAN FRONT
EXHAUST
HOOD W/(4)
SCREWS
COMBUSTION
AIR INLET
HOOD W/(4)
SCREWS

10
FIGURE 5
COVER GASKET DETAIL FOR UNITS SHIPPED FOR DOWNFLOW
APPLICATION BEING CONVERTED TO SIDE DISCHARGE
TAPE
AROUND FLANGE
SUPPLY/RETURN
AIR COVER
FIGURE 6
COVER GASKET DETAIL FOR UNITS SHIPPED FOR SIDE DISCHARGE
APPLICATION BEING CONVERTED TO DOWNFLOW
TAPE
AROUND FLANGE
SUPPLY/RETURN
AIR COVER
I654
FIGURE 7
DUCT COVER INSTALLATION SIDE MOUNTING
I264
RETURN
DUCT COVER
(ATTACH WITH 6 SCREWS)
SUPPLY
DUCT COVER
(ATTACH WITH 6 SCREWS)
FIGURE 8
DUCT COVER INSTALLATION BASE PAN MOUNTING
I265
BASE PAN
SUPPLY DUCT
COVER
*
(INSULATION
SIDE UP),
ATTACH WITH
TWO SCREWS.
RETURN
DUCT
COVER
(INSULATION
SIDE UP,
ATTACH
WITH 4
SCREWS)
SUPPLY DUCT
COVER
* ROTATE SUPPLY COVER 90° AFTER IT IS INSERTED
THROUGH OPENING. SLIP FLANGE OF COVER
UNDER LANCE AT BACK OF BOTTOM SUPPLY DUCT
OPENING. SEE DETAIL AT LEFT. THEN SECURE
COVER BY INSTALLING 2 SCREWS USING HOLE
NEAREST THE OUTSIDE OF UNIT.
LANCE AT BACK OF BOTTOM
SUPPLY DUCT OPENING

11
c. Install covers in the unit bottom with the insulated side up. NOTE: Supply cover
must be inserted through supply opening with narrow side toward unit. Once
cover is through opening, rotate 90° and slip back flange of cover under tab at the
back of bottom duct opening. See Figure 8.
d. Secure supply cover to base of unit with 2 screws, engaging prepunched holes in
raised duct opening flange.
e. Secure return covers to base of unit with screws engaging prepunched holes in
raised duct opening flange.
E.CLEARANCES
The following minimum clearances must be observed for proper unit performance and
serviceability. See Figure 9.
1. Provide 48” minimum clearance at front of the unit. Provide 24” minimum clearance
on right side of unit. If economizer is used, a 24” minimum clearance is required on
left side of unit. (See Figure 9.) If no economizer is required, then a 12” clearance
is required on left side of unit.
2. Provide 60” minimum clearance between top of unit and maximum 3 foot overhang.
3. Unit is design certified for 2” minimum clearance between supply duct and a com-
bustible structure for the first 3 feet of duct. 0” clearance is allowed after 3 feet.
!WARNING
THIS UNIT MUST NOT BE INSTALLED DIRECTLY ON WOOD FLOORING, CLASS
A, CLASS B OR CLASS C ROOF COVERING MATERIALS, OR ANY OTHER COM-
BUSTIBLE STRUCTURE EXCEPT AS SPECIFIED IN FIGURE 13. FAILURE TO
ADHERE TO THIS WARNING CAN CAUSE A FIRE OR EXPLOSION RESULTING
IN PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.

12
FIGURE 10
EXCEPTION TO NON-COMBUSTIBLE FLOORING REQUIREMENT
I458
BOTH ENDS
MUST BE
OPEN FOR
DOWNFLOW
OR SIDEFLOW
DUCTWORK
TO PROVIDE
VENTILATION
COMBUSTIBLE
STRUCTURE
1” MIN.
NOMINAL
4 x 4 TIMBER
(SIDES ONLY)
SIDEFLOW
SUPPLY
PLENUM
CONNECTION
SUPPLY
PLENUM
(DOWNFLOW)
RETURN PLENUM
(DOWNFLOW)
SIDEFLOW
RETURN PLENUM
CONNECTION
3-1/2” MIN.

13
F. ROOFTOP INSTALLATION
1. Before locating the unit on the roof, make sure that the roof structure is adequate to
support the weight involved. (See electrical & physical tables in this book for weight
of unit.) THIS IS VERY IMPORTANT AND THE INSTALLER’S RESPONSIBILITY.
2. For rigging and roofcurb details, see Figures 14, 15, and 16.
3. The location of the unit on the roof should be such as to provide proper access for
inspection and servicing.
IMPORTANT: If unit will not be put into service immediately, block off supply and return
air openings to prevent excessive condensation.
G. DUCTWORK
The installing contractor should fabricate ductwork in accordance with local codes. Use
industry manuals as a guide when sizing and designing the duct system. Contact Air
Conditioning Contractors of America, 1513 16th St. N.W., Washington, D.C. 20036.
Place the unit as close to the conditioned space as possible allowing clearances as indi-
cated. Run ducts as directly as possible to supply and return outlets. Use of non-flam-
mable weatherproof flexible connectors on both supply and return connections at unit to
reduce noise transmission is recommended.
On ductwork exposed to outside temperature and humidity, use a minimum of 2” of
insulation and a vapor barrier. Distribution system in attic, furred space or crawl space
should be insulated with at least 2” of insulation. 1⁄2” to 1” thick insulation is usually suffi-
cient for ductwork inside the air conditioned space.
Provide balancing dampers for each branch duct in the supply system. Properly support
ductwork from the structure.
!WARNING
DO NOT, UNDER ANY CIRCUMSTANCES, CONNECT RETURN DUCTWORK TO
ANY OTHER HEAT PRODUCING DEVICE SUCH AS FIREPLACE INSERT,
STOVE, ETC. UNAUTHORIZED USE OF SUCH DEVICES MAY RESULT IN FIRE,
CARBON MONOXIDE POISONING, EXPLOSION, PERSONAL INJURY, OR
PROPERTY DAMAGE.
13

14
IMPORTANT: In the event that the return air ducts must be run through an “unconfined”
space containing other fuel burning equipment, it is imperative that the user/homeowner
must be informed against future changes in construction which might change this to a
“confined space.” Also, caution the user/homeowner against any future installation of
additional equipment (such as power ventilators, clothes dryers, etc., within the existing
unconfined and/or confined space which might create a negative pressure within the
vicinity of other solid, liquid, or gas fueled appliances.
H. RETURN AIR
II. FILTERS
The installer must install field supplied filters in the return air duct. A field installed filter
grille is recommended for easy and convenient access to the filters for periodic inspec-
tion and cleaning. Filters must have adequate face area for the rated air quantity of the
unit. See air delivery tables for recommended filter size. A field installed internal filter kit
RXRY-B01 is available.
!WARNING
NEVER ALLOW PRODUCTS OF COMBUSTION OR THE FLUE PRODUCTS TO
ENTER THE RETURN AIR DUCTWORK, OR THE CIRCULATING AIR SUPPLY.
ALL RETURN DUCTWORK MUST BE ADEQUATELY SEALED AND SECURED
TO THE FURNACE WITH SHEET METAL SCREWS, AND JOINTS TAPED. ALL
OTHER DUCT JOINTS MUST BE SECURED WITH APPROVED CONNECTIONS
AND SEALED AIRTIGHT.
FAILURE TO PREVENT PRODUCTS OF COMBUSTION FROM BEING CIRCU-
LATED INTO THE LIVING SPACE CAN CREATE POTENTIALLY HAZARDOUS
CONDITIONS, INCLUDING CAROBON MONOXIDE POISONING THAT COULD
RESULT IN PERSONAL INJURY OR DEATH.

15
I342
RETURN PLENUM
161/2
MAX.
201/2 MAX.
163/8 MAX.
INSULATION
PANELS
NAILING
STRIP
CAULK ALL
JOINTS
WATERTIGHT
SUPPLY
PLENUM
DUCT
FLANGE
(NOT TO
EXCEED 1()
ROOFCURB
FIGURE 15
ROOFCURB
I255
**BY CONTRACTOR
**FOR INSTALLATION OF DUCT AS SHOWN, USE RECOMMENDED
DUCT SIZES FROM ROOFCURB INSTALLATION INSTRUCTIONS. FOR
DUCT FLANGE ATTACHMENT TO UNIT, SEE UNIT INSTALLATION
INSTRUCTIONS (FIGURE 1) FOR SIZE OF DUCT OPENINGS.
ROOFTOP UNIT
TIE DOWN SCREW *
ROOFCURB
ROOF FLASHING *
ROOFING *
CANT STRIP *
ROOF DECK *
GASKET
NAILING STRIP
INSULATION *
INSULATION *
** DUCT *
FIGURE 16
ROOFCURB

16
VIII. GAS SUPPLY, CONDENSATE DRAIN AND
VIII. PIPING
A. GAS CONNECTION
IMPORTANT: Connect this unit only to gas supplied by a commercial utility.
1. Install gas piping in accordance with local codes and regulations of the local utility
company. In the absence of local codes, the installation must conform to the specifi-
cations of the National Fuel Gas Code, ANSI Z223.1 - latest edition.
NOTE: The use of flexible gas connectors is not permitted.
NOTE: The Commonwealth of Massachusetts requires the gas shut-off valve to be
a T-handle gas cock.
2. Connect the gas line to the gas pipe inlet opening provided into the 1/2” inlet valve.
See Figure 2 for typical piping.
3. Size the gas line to the furnace adequate enough to prevent undue pressure drop
and never less than 1/2”.
4. Install a drip leg or sediment trap in the gas supply line as close to the unit as possi-
ble.
5. Install an outside ground joint union to connect the gas supply to the control assem-
bly at the burner tray.
6. Gas valves have been factory installed. Install a manual gas valve where local codes
specify a shut-off valve outside the unit casing. (See Figure 19.)
7. Make sure piping is tight. A pipe compound resistant to the action of liquefied
petroleum gases must be used at all threaded pipe connections.
8. IMPORTANT: Any additions, changes or conversions required for the furnace to sat-
isfactorily meet the application should be made by a qualified installer, service
agency or the gas supplier, using factory-specified or approved parts. In the com-
monwealth of Massachusetts, installation must be performed by a licensed plumber
or gas fitter for appropriate fuel.
IMPORTANT: Disconnect the furnace and its individual shutoff valve from the gas sup-
ply piping during any pressure testing of that system at test pressures in excess of 1/2
psig or isolate the system from the gas supply piping system by closing its individual
manual shutoff valve during any pressure testing of this gas supply system at pressures
equal to or less than 1/2 PSIG.
FIGURE 19
SUGGESTED GAS PIPING
FROM GAS
METER
*Factory supplied grommet must be utilized.
MANUAL GAS
SHUT-OFF
VALVE
UNIT GAS SUPPLY
CONNECTION *
ROOF OR GROUND LEVEL INSTALLATION
Nominal
Iron Pipe
Size,
Inches
Equivalent Length of Pipe, Feet
10 20 30 40 50 60 70 80
1/2132 92 73 63 56 50 46 43
3/4278 190 152 130 115 105 96 90
1 520 350 285 245 215 195 180 170
11/41,050 730 590 500 440 400 370 350
11/21,600 1,100 890 760 670 610 560 530
TABLE 1
GAS PIPE CAPACITY TABLE (CU. FT./HR.)

17
TO CHECK FOR GAS LEAKS, USE A SOAP AND WATER SOLUTION OR OTHER
APPROVED METHOD. DO NOT USE AN OPEN FLAME.
IMPORTANT: Check the rating plate to make certain the appliance is equipped to burn
the type of gas supplied. Care should be taken after installation of this equipment that
the gas control valve not be subjected to high gas supply line pressure.
In making gas connections, avoid strains as they may cause noise and damage the con-
trols. A backup wrench is required to be used on the valve to avoid damage.
The capacities of gas pipe of different diameters and lengths in cu. ft. per hr. with pres-
sure drop of 0.5 in. and specific gravity of 0.60 (natural gas) are shown in Table 2.
After determining the pipe length, select the pipe size which will provide the minimum
cubic feet per hour required for the gas input rating of the furnace. By formula:
Gas Input of Furnace
(BTU/HR)
Cu. Ft. Per Hr. Required = Heating Value of Gas
(BTU/FT3)
The gas input of the furnace is marked on the furnace rating plate. The heating value of
the gas (BTU/FT3) may be determined by consulting the local natural gas utility or the
L.P. gas supplier.
B. LP CONVERSION
Convert the valve to use liquefied petroleum (LP) gas by replacing the pressure regulator
spring with the conversion kit spring. This LP kit spring allows the regulator to maintain the
proper manifold pressure for LP gas. The correct burner LP orifices are included in the kit.
See Figure 20.
NOTE: Order the correct LP conversion kit from the furnace manufacturer.
See
Conversion Kit Index shipped with unit for proper LP kit number. Furnace conver-
sion to LP gas must be performed by a qualified technician.
!WARNING
DO NOT USE AN OPEN FLAME TO CHECK FOR LEAKS. THE USE OF AN OPEN
FLAME CAN RESULT IN FIRE, EXPLOSION, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
!WARNING
THIS UNIT IS EQUIPPED AT THE FACTORY FOR USE ON NATURAL GAS ONLY.
CONVERSION TO LP GAS REQUIRES A SPECIAL KIT SUPPLIED BY THE DIS-
TRIBUTOR OR MANUFACTURER. MAILING ADDRESSES ARE LISTED ON THE
FURNACE RATING PLATE, PARTS LIST AND WARRANTY. FAILURE TO USE
THE PROPER CONVERSION KIT CAN CAUSE FIRE, CARBON MONOXIDE POI-
SONING, EXPLOSION, PERSONAL INJURY, PROPERTY DAMAGE OR DEATH.
FIGURE 20

18
D. ADJUSTING OR CHECKING FURNACE INPUT
– Natural Gas Line Pressure 5” - 10.5” W.C.
– LP Gas Line Pressure 11” - 13” W.C.
– Natural Gas Manifold Pressure 3.5” W.C
– LP Gas Manifold Pressure - 10” W.C.
Supply and manifold pressure taps are located on the gas valve body 1/8” N.P.T.
Use a properly calibrated manometer gauge for accurate gas pressure readings.
Only small variations in the gas flow should be made by means of the pressure regulator
adjustment. Furnaces functioning on LP gas must be set by means of the tank or branch
supply regulators. The furnace manifold pressure should be set at 10” W.C. at the gas con-
trol valve.
To adjust the pressure regulator, remove the regulator cap and turn the adjustment screw
clockwise to increase pressure or counterclockwise to decrease pressure. Then replace
the regulator cap securely.
Any necessary major changes in the gas flow rate should be made by changing the size of
the burner orifices. To change orifice spuds, shut off the manual main gas valve and
remove the gas manifold.
For elevations up to 2,000 feet, rating plate input ratings apply. For high altitudes (elevations
over 2,000 ft.), see conversion kit index 92-21519-XX for derating and orifice spud sizes.
Check of input is important to prevent over-firing of the furnace beyond its design-
rated input. NEVER SET INPUT ABOVE THAT SHOWN ON THE RATING PLATE. Use
the following table or formula to determine input rate.
Heating Value of Gas
(BTU/Cu. Ft.) x 3600
Cu. Ft. Per Hr. Required = Time in Seconds
(for 1 Cu. Ft.) of Gas
C. NOx MODELS
When converting units equipped with NOx inserts to LP gas, the stainless steel mesh
inserts in the entrance of the tubular exchangers are not required to meet SCAQMD NOx
emission levels. Carefully remove these inserts before firing this furnace on LP gas. This
furnace is not designed to operate on LP gas with the NOx inserts in place.
Step by step instructions on removing the NOx inserts and retaining rod are included in the
Conversion Kit Installation Instructions.
Maximum capacity of pipe in thousands of BTU per hour of undiluted liquefied petroleum
gases (at 11 inches water column inlet pressure).
(Based on a Pressure Drop of 0.5 Inch Water Column)
TABLE 2
LP GAS PIPE CAPACITY TABLE (CU. FT./HR.)
Nominal
Iron Pipe
Size, Inches 10 20 30 40 50 60 70 80 90 100 125 150
275 189 152 129 114 103 96 89 83 78 69 63
567 393 315 267 237 217 196 182 173 162 146 132
1,071 732 590 504 448 409 378 346 322 307 275 252
2,205 1,496 1,212 1,039 913 834 771 724 677 630 567 511
3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023 976 866 787
6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496
1/2
3/4
1
1-1/4
1-1/2
2
Length of Pipe, Feet
Example (LP): Input BTU requirement of unit, 150,000
Equivalent length of pipe, 60 ft. = 3/4” IPS required.

19
Start the furnace and measure the time required to burn one cubic foot of gas. Prior to
checking the furnace input, make certain that all other gas appliances are shut off, with
the exception of pilot burners. Time the meter with only the furnace in operation.
IMPORTANT NOTE FOR ALTITUDES ABOVE 2,000 FEET (610 METERS): The main
burner orifices in your furnace and in these kits are sized for the nameplate input and
intended for installations at elevations up to 2,000 feet in the USA or Canada, or for ele-
vations of 2,000 - 4,500 feet (610 -1,373 meters) in Canada if the unit has been derated
at the factory. For elevations above 2,000 feet (610 meters) IN THE USA ONLY (see
ANSI-Z223.1), the burner orifices must be sized to reduce the input 4% for each 1,000
feet (305 meters) above sea level.
NOTICE: DERATING OF THE HEATING INPUT FOR HIGH ALTITUDE IN THE FIELD
IS UNLAWFUL IN CANADA (REFER TO CAN/CGA 2.17). UNITS INSTALLED IN
ALTITUDES GREATER THAN 2,000 FEET (610 METERS) MUST BE SHIPPED FROM
THE FACTORY OR FROM A FACTORY AUTHORIZED CONVERSION STATION
WITH THE HEATING INPUT DERATED BY 10% SO AS TO OPERATE PROPERLY IN
ALTITUDES FROM 2,000 - 4,500 FEET (610 - 1,373 METERS).
E.CONDENSATE DRAIN
The evaporator coil condensate drain ends with a threaded 3/4” nominal PVC stub. A
trap is built in for proper condensate drainage and to prevent debris from being drawn
into the unit. Do not connect the drain to a closed sewer line. Connection to a vented
sewer line is allowed. It is recommended that a PVC cement not be used so that the
drain line can be easily cleaned in the future.
IMPORTANT: DO NOT INSTALL AN EXTERNAL TRAP. DOING SO CAN CAUSE
IMPROPER DRAINAGE OF THE CONDENSATE AND RESULT IN FLOODING WITH-
IN THE UNIT.
IX. WIRING
A. POWER SUPPLY
!WARNING
TURN OFF THE MAIN ELECTRICAL POWER AT THE BRANCH CIRCUIT DISCON-
NECT CLOSEST TO THE UNIT BEFORE ATTEMPTING ANY WIRING. FAILURE
TO DO SO CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL
INJURY OR DEATH.
ONE 1 21 1 30 1 34 1 39 3 45
40,000 TEN 13 30 15 0 15 36 16 30 37 30
ONE 0 54 1 0 1 3 1 6 2 30
60,000 TEN 9 0 10 0 10 24 11 0 25 0
ONE 0 41 0 45 0 47 0 50 1 53
80,000 TEN 6 45 7 30 7 48 8 15 18 45
ONE 0 33 0 36 0 38 0 40 1 30
100,000 TEN 5 24 6 0 6 15 6 36 15 0
METER TIME IN MINUTES AND SECONDS FOR NORMAL
INPUT RATING OF FURNACES EQUIPPED FOR NATURAL
OR LP GAS
INPUT
BTU/HR
METER
SIZE
CU. FT.
HEATING VALUE OF GAS BTU PER CU. FT.
900 1000 1040 1100 2500
MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC.
TABLE 3

20
1. All wiring should be made in accordance with the National Electrical Code.
Consult the local power company to determine the availability of sufficient power to
operate the unit. Check the voltage at power supply to make sure it corresponds to
the unit’s RATED VOLTAGE REQUIREMENT. Install a branch circuit disconnect
near the rooftop, in accordance with the N.E.C., C.E.C. or local codes.
2. It is important that proper electrical power is available at the unit. Voltage should not
vary more than 10% from that stamped on the unit nameplate. On three phase units,
phases must be balanced within 3%.
3. For branch circuit wiring (main power supply to unit disconnect), the minimum wire size
for the length of run can be determined from Table 4 using the circuit ampacity found on
the unit rating plate. Use the smallest wire size allowable in Table 4 from the unit dis-
connect to unit. The disconnect must be in sight and readily accessible of the unit.
NOTES:
1. Wire size based on 60°C rated wire insulation and 30°C Ambient Temp. (86°F).
2. For more than 3 conductors in a raceway or cable, see the N.E.C. for derating the
ampacity of each conductor.
When installed, the unit must be electrically grounded in accordance with local
codes or, in the absence of local codes, with the National Electrical Code,
ANSI/NFPA 70, if an external electrical source is utilized.
IMPORTANT: THIS UNIT IS APPROVED FOR USE WITH COPPER CONDUCTORS
ONLY CONNECTED TO UNIT CONTACTOR.
WARRANTY MAY BE JEOPARDIZED IF ALUMINUM WIRE IS CONNECTED TO
UNIT CONTACTOR.
Special instructions apply for power wiring with aluminum conductors: Warranty
is void if connections are not made per instructions.
Attach a length (6” or more) of recommended size copper wire to the unit contactor ter-
minals L1 and L3 for single phase, L1, L2 and L3 for three phase.
Select the equivalent aluminum wire size from the tabulation below:
Splice copper wire pigtails to aluminum wire with U.L. recognized connectors for copper-
aluminum splices. Please exercise the following instructions very carefully to obtain a
positive and lasting connection:
1. Strip insulation from aluminum conductor.
2. Coat the stripped end of the aluminum wire with the recommended inhibitor, and
wire brush the aluminum surface through inhibitor. INHIBITORS: Brundy-Pentex “A”;
Alcoa-No. 2EJC; T & B-KPOR Shield.
3. Clean and recoat aluminum conductor with inhibitor.
4. Make the splice using the above listed wire nuts or split bolt connectors.
5. Coat the entire connection with inhibitor and wrap with electrical insulating tape.
200 6 4 4 4 3 3 2 2
150 8 6 6 4 4 4 3 3
100 10 8 8 6 6 6 4 4
50 14 12 10 10 8 8 6 6
15 20 25 30 35 40 45 50
TABLE 4
BRANCH CIRCUIT COPPER WIRE SIZE
(BASED ON 1% VOLTAGE DROP)*
SUPPLY WIRE
LENGTH-FEET
*Taken from National Electric Code
BRANCH CIRCUIT AMPACITY
AWG Copper AWG Aluminum Connector Type and Size
Wire Size Wire Size (or equivalent)
#12 #10 T & B Wire Nut PT2
#10 # 8 T & B Wire Nut PT3
# 8 # 6 Sherman Split Bolt TSP6
# 6 # 4 Sherman Split Bolt TSP4
# 4 # 2 Sherman Split Bolt TSP2
TABLE 5