Amana PGB58B, PGC(24-60)B User Manual

Heating ¡ Air Conditioning

A higher standard of comfort

MODELS

PGC(24-60)B and

PGB58B

Table of Contents

I. Unit Specifications ........................................ 2

II. Safety Information ......................................... 6

III. General Information ...................................... 7

IV. Rigging and Handling ................................... 9

V. Gas Piping .................................................... 10

Vl. Electrical Wiring .......................................... 12

Vll. Circulating Air and Filters .......................... 13

VIII. Flue Vent ....................................................... 16

IX. Condensate Drain ........................................ 16

X. Heating Sequence of Operations............... 18

XI. Cooling Sequence of Operations .............. 18

XIl. Startup and Adjustment .............................. 18

XIII. Maintenance................................................. 24

XIV. Accessories and Functional Parts ............ 26

XV. Typical Cooling Performance Data ............ 27

XVI. Wiring Diagram ............................................ 29

Gas-Electric Package

Unit

Cooling and Heating

Installation Instructions

RECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION

ATTENTION INSTALLING PERSONNEL

As a professional installer you have an obligation to know the product better than the customer. This includes all safety precautions and related items.

Prior to actual installation, thoroughly familiarize yourself with this Instruction Manual. Pay special attention to all safety warnings. Often during installation or repair it is possible to place yourself in a position which is more hazardous than when the unit is in operation.

Affix These Installation Instructions Adjacent To The Appliance.

Remember, it is your responsibility to install the product safely and to know it well enough to be able to instruct a customer in its safe use.

Safety is a matter of common sense...a matter of thinking before acting. Most dealers have a list of specific good safety practices...follow them.

The precautions listed in this Installation Manual should not supersede existing practices but should be considered as supplemental information.

Amana

May 1998 (2) 11073904

Fayetteville, TN 37334

I. Unit Specifications

MODEL PGC24B0452A PGC24B0702A PGC30B0702A PGC36B0702A PGC36B09 02A Cooling Cap acity Btuh 24,000 24,000 30,000 36,000 36,000 SEER 12.50 12.50 12.30 12.00 12.00 Heating

Input Btuh 45,000 70,000 70,000 70,000 90,000

Output Btuh 35,000 55,000 55,000 55,000 70,000

AFUE 80.9 80.1 80.1 80.1 80.4

Temperature Rise °F 20-50 30-60 30- 60 30-60 40-70

Number of Burn er s 2 3 3 3 4

Compressor

R.L. Amps 12.9 12.9 15 20 20 L.R. Amps 62.5 62.5 76 90.5 90.5

Condenser Coil

Face Area (sq. ft.) 12.3 12.3 12.3 14 14

Rows Deep 1 1/2 1 1/2 2 2 2

Fins/Inch 13 13 13 13 13

Condenser Fan

Diameter (in.) 20 20 20 20 20

CFM 2670 2670 2700 3060 3060

Condenser Fan Motor

Horsepower 1/8 1/8 1/4 1/4 1/4

R.L. Amps 0.8 0.8 1.2 1.5 1.5 L.R. Amps 1.5 1.5 3 3.4 3.4

Blower M o to r

Horsepower 0.5 0.5 0.5 0.5 0. 5

R.L. Amps 4.3 4.3 4.3 4.3 4.3 L.R. Amps Protected by redundant electronic control circuits

Blower Wh eel Dia. x Width (in .) 10x7 10x7 10x7 10x7 10x7

Rated CFM, Cooling 850 850 1100 1300 1300

Max. External 0.8" wc 0.8" wc 0.8" wc 0.8" wc 0.8" wc

Combustion Blower

Diameter x Wi d th (in.) 4 x 1.25 4 x 1.25 4 x 1.25 4 x 1.25 4 x 1.25

No. 11111

Condenser Blower Motor

H.P. 0.03125 0.03125 0.03125 0.031 25 0.03125

F.L. Amps. 0.5 0.5 0.5 0.5 0.5

Press. Switch S ett in g (" W.C.) -0.65 -0.65 -0.65 -0.65 -0.65

Ignition - Lockout Timing (sec.) 4 4 4 4 4

Flame Sense Current (microamps)

Minimum 11111

Maximum 66666

Evaporator Coil

Face Area (Sq. Ft.) 4 4 4 4 4

Rows Deep 22244

Fins/Inch 16 16 16 12 12

External Filter Size (Sq. Ft.) 3.6 3.6 3.6 3.6 3.6

Drain Line Size (in.) 3/4 3/4 3/4 3/4 3/4

Expansion Device (Cooling) Capillary Capillary Capillary Capillary Capillary

Refrigerant Charge Refer to unit nam e p late for correct charg e

Power Supply** 208/230-60-1 208/230-60-1 208/230-60-1 208/230-60-1 208/230-60-1

Min. Circuit Ampacity 21.3 21.3 24.3 30.8 30.8

Max. Overcurre n t Device 30 30 35 45 45

Electrical Entrance Size

Power Supply 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2"

Low Voltage 7/8" 7/8" 7/8" 7/8" 7/8"

Approx. Shipping Weight (lb.) 385 39 4 418 437 443

1) United States Installation

2) Specification subject to change without notice. See sales specification sheets for certain BTUH capacities.

3) This PGC series complies with requirements embodied in the American National Standard ANSI-Z21.47 Central Furnaces.

4) Filters are not supplied with units, but filters must be installed in the unit filter rack or in the return air system. ** While the above data is presented as a guide, it is important to electrically connect the unit and properly size overcurrent protection and wires in accordance with the National Electrical Code and all existing local codes. Operating tolerance: Minus 5% on 208 VAC, Plus 10% on 208 VAC and 230 VAC, Minus 10% on 230 VAC

Table 1A

Gas Pack Specifications

MODEL PGC42B0902A PGC42B1152A PGC48B0902A PGC48B1152A PGC60B0902A PGC60B1352A Cooling Capacity Btuh 42,000 42,000 48,000 48,000 60,000 60,000 SEE R 12.20 12.20 12.00 12.00 12.00 12.00 Heating

Compressor

Condenser Coil

Condenser Fan

Condenser Fan Motor

Blow er Mot or

Blower Wheel Dia. x W idth (in.) 10x10 10x10 10x10 10x10 11x8 11x8

Combustion Blower

Condenser Blower Motor

P ress. S wi t ch Setting (" W.C.) -0.65 -0 .65 -0.65 -0.65 -0 .65 -0.65

Ignition - Lockout Timing (sec.) 4 4 4 4 4 4

Flame Sense Current ( microamps)

Evaporator Coil

Electrical Entrance Size

Approx. Shipping Weight (lbs) 521 527 526 526 531 531

Input B tuh 90, 000 115,000 90,000 115,000 90,000 135,000

Output Btuh 72,000 89,000 72,000 89,000 72,000 108,000

AFUE 81.4 79.9 81.4 79.9 81.4 80.5

Temperature Rise °F 25-55 40-70 25-55 40-70 25-55 40-70

Number of Bu rners 4 5 4 5 5 6

R.L. Amps 22 22 21.8 21.8 28.8 28.8 L.R. Amps 107 107 105 105 169 169

Face Area (sq. ft.) 17.2 17.2 17.2 17.2 17.2 17.2

Rows Deep 222222

Fins/Inch 13 13 17 17 17 17

Diameter (in.) 242424242424

CFM 3500 3500 3700 3700 4700 4700

Horsepower 1/4 1/4 1/2 1/2 1/3 1/3

R .L. Amps 1.5 1.5 1.5 1.5 2.5 2.5 L.R. Amps 3.4 3.4 3.6 3.6 6.4 6.4

Horsepower 3/4 3/4 3/4 3/4 1 1

R.L. Amps 555577 L.R. Amps

Rated CFM, Cooling 1450 1450 1700 1700 1750 1750

Max. External 0.8" wc 0.8" wc 0.8" wc 0.8" wc 0.8" wc 0.8" wc

Diameter x Width (in.) 4 x 1.25 4 x 1.25 4 x 1.25 4 x 1.25 4 x 1.25 4 x 1.25

No. 111111

H.P . 0.03125 0.03125 0.03125 0.03125 0.03125 0.03125

F.L. Amps. 0.5 0.5 0.5 0.5 0.5 0.5

Minimum 111111

Maximum 666666

Face Area (Sq. Ft.) 5.7 5.7 5.7 5.7 5.7 5.7

Rows Deep 223333

Fins/Inch 15 15 15 15 15 15

External F ilter Size (Sq. Ft.) 5.3 5.3 5.3 5.3 5.3 5.3

Drain Line Size (in.) 3/4 3/ 4 3/4 3/4 3/4 3/4

Expansion Device (Cooling) Capillary Capillary TEV TEV TEV TEV

Refrigerant Charge Refer to unit name plate for correct charge

Power Supply** 208/230-60-1 208/230-60-1 208/230-60-1 208/230-60-1 208/230-60-1 208/230-60-1

Min. Circuit Ampacity 34 34 39.5 39.5 49.7 49.7

Max. Overcurrent Device 50 50 50 50 70 70

Power Supply 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2"

Low Voltage 7/8" 7/8" 7/8" 7/8" 7/8" 7/8"

Protected by redundant electronic control circuts

1) United States Installation

2) Specification subject to change without notice. See sales specification sheets for certain BTUH capacities.

3) This PGC series complies with requirements embodied in the American National Standard ANSI-Z21.47 Central Furnaces.

Table 1B

Gas Pack Specifications

MODEL PGB58B0902A PGB58B1152A PGB58B1352A Cooling Capacity Btuh 59,500 59,500 59,500 SEER 11.10 11.10 11.10 Heating

Input Btuh 90,000 115,000 135,000

Output Btuh 72,000 92,000 108,000

AFUE 81.4 79.9 80.5

Temperature Rise °F 25-55 25-55 25-55

Number of Burners 4 4 4

Compressor

R.L. Amps 28.8 28.8 28.8 L.R. Amps 169 169 169

Condenser Coil

Face Area (sq. ft.) 17.2 17.2 17.2

Rows Deep 2 2 2

Fins/Inch 17 17 17

Condenser Fan

Diameter (in.) 24 24 24

CFM 4700 4700 4700

Condenser Fan Motor

Horsepower 1/3 1/3 1/3

R.L. Amps 2.5 2.5 2.5 L.R. Amps 6.4 6.4 6.4

Blower Motor

Horsepower 3/4 3/4 3/4

R.L. Amps 5.6 5.6 5.6 L.R. Amps 12.9 12.9 12.9

Blower Wheel Dia. x Width (in.) 11X8 11X8 11X8

Rated CFM, Cooling 1750 1750 1750

Max. External 0.5" wc 0.5" wc 0.5" wc

Combustion Blower

Diameter x Width (in.) 4 x 1.25 4 x 1.25 4 x 1.25

No. 111

Condenser Blower Motor

H.P. 1/32 1/32 1/32

F.L. Amps. 0.5 0.5 0.5

Press. Switch Setting (" W.C.) -0.65 -0.6 5 -0.65

Ignition - Lockout Timing (sec.) 4 4 4

Flame Sense Current (microamps)

Minimum 111

Maximum 666

Evaporator Coil

Face Area (Sq. Ft.) 5.7 5.7 5.7

Rows Deep 4 4 4

Fins/Inch 15 15 15

External Filter Size (Sq. Ft.)

Drain Line Size (in.) 3/4 3/4 3/4

Expansion D evice (Cooling) TEV TEV TEV

Refrigerant Charge Refer to unit name plate for correct charge

Power Supply** 208/230-60-1 208/230-60-1 208/230-60-1

Min. Circuit Ampacity 33.75 33.75 33.75

Max. Overcurrent Device 50 50 50

Electrical Entrance Size

Power Supply 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2" 1 1/4", 1 1/2", 2"

Low Voltage 7 /8" 7/8" 7/8"

Approx. Shippi ng Weight (lbs) 531 531 531

Table 1C

Gas Pack Specifications

Nominal

Model

PGC24B0452A 24000 850 45000 930 570 35 A A PGC24B0702A 24000 850 70000 1140 570 45 A B PGC30B0702A 30000 1100 70000 1140 570 45 B B PGC36BO702A 36000 1300 70000 1140 570 45 C B PGC36B0902A 36000 1300 90000 1350 570 55 C C PGC42B0902A 42000 1450 90000 1650 815 40 A A PGC42B1152A 42000 1450 115000 1530 815 55 A B PGC48B0902A 48000 1700 90000 1650 815 40 B A PGC48B1152A 48000 1700 115000 1530 815 55 B B PGC60B0902A 60000 1750 90000 1650 815 40 A A PGC60B1352A 60000 1750 135000 1900 815 55 A B

1. Installation is to be adjusted to obtain temperature rise within the range specified on the rating plate.

2. The temperature rise is for units installed at 0-2000 feet. At higher altitudes, a properly derated unit will have approximately the same temperature rise and CFM.

3. The chart is applicable for both vertical and horizontal airflow.

4. All speed tap settings are factory selected according to unit size.

5. Data shown without filters. Consult filter manufacturer for pressure drop to be added.

6. Motor is constant CFM for external static pressures 0.1" to 0.8" W.C.

7. Maximum External Pressure Limits

PGC 24-42 0.8" W.C. PGC46 & 60 1.0 W.C.

Cooling Nominal

Capacity

(MBh)

Cooling

CFM

(Y+G) (W1) (G) Cool Heat

Nominal

Heating Nominal Nominal Temp. Speed

Capacity

(Input)

Heating

CFM

Fan Only Rise (°F) Taps

Table 2A

PGC Temperature Rise Table

Model Speed CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE

Motor 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Hi 2160 31 2120 31 2080 32 2030 33 1990 34 1945 34 1900 35 1835 36

PGB58B0902C Med 1750 38 1750 39 1700 39 1680 40 1680 40 1615 41 1575 42 1490 45

Lo 1490 45 1480 45 1470 45 1450 46 1440 46 1415 47 1360 49 1280 52 Hi 2160 --- 2120 --- 2080 41 2030 42 1990 43 1945 44 1900 45 1835 46

PGB58B1152C Med 1750 49 1750 49 1700 50 1680 51 1650 52 1615 53 1575 54 1470 57

Lo 1490 57 1480 58 1470 58 1460 58 1440 59 1415 60 1360 63 1280 67 Hi 2160 46 2120 47 2080 48 2030 49 1990 50 1945 51 1900 53 1835 54

PGB58B1352C Med 1750 57 1750 58 1700 59 1680 60 1650 61 1615 62 1575 63 1490 67

Lo 1490 67 1480 68 1470 68 1460 68 1440 69 1415 --- 1360 --- 1280 ---

NOTE:

1. All airflow is dry coil.

2. Installation is to be adjusted to obtain temperatures rise within the range specified on the rating plate.

3. The above chart is for information only. For satisfactory operation, external static pressure should not exceed value shown on the rating plate. The shaded area ( ) indicates in excess of maximum external static pressure allowable when heating.

4. This chart is for units installed at 0-2000 feet. At higher altitudes, a properly derated unit will have approximately the same temperature rise at a particular CFM, while ESP at that CFM will be lower.

5. Cooling operation may require a different fan speed than heating operation. For details, see Wiring Diagrams.

6. Above chart is applicable for both vertical and horizontal airflow.

External Static Pressure, Inches Water Column

Table 2B

PGB CFM& Temperature Rise vs. External Static Pressure Table

II. Safety Information

WARNING

Important To The Installer

Before installing this unit please read this manual to familiarize yourself with the specific items which must be adhered to such as maximum external static pressure to unit, air temperature rise, minimum or maximum CFM and motor speed connections. Affix these Installation Instructions adjacent to the appliance.

To The Owner

It is important that you complete the owner registration card and mail it today. This will assist Amana in contacting you if any service or warranty information should change in the future. When completing the registration card, be sure to include the Model, Manufacturing and Serial Numbers, plus the installation date.

Your warranty certificate is also supplied with the unit. Read the warranty carefully and note what is covered. Keep the warranty certificate in a safe place so you can find it if necessary.

If additional operating Instructions are required, call the dealer where the purchase was made. Keep this literature in a safe place for future reference.

Do not store gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.

If you smell gas:

• Extinguish any open flame.

• Do not try to light appliance.

• Do not touch any electrical switch: do not use any

phone in building.

• Immediately call gas supplier from a neighbor’s

phone. Follow gas supplier’s instructions.

• If gas supplier cannot be reached, call fire depart-

ment.

WARNING

Improper installation, adjustment, alterations, service or maintenance can cause property damage, personal injury, or death. Follow all procedures in this manual. For assistance or additional information, contact a qualified installer, service agency, or gas supplier.

WARNING

Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the furnace before shutting off the electrical supply.

CAUTION

On PGC48 - 60 and PGB58 Only: To avoid damage to the compressor, engage the electrical disconnect switch to the compressor unit four hours prior to operating air conditioner after the electrical disconnect is off for a prolonged period of time (during vacation, etc.). This time lapse allows the compressor crankcase to attain a proper operating temperature.

WARNING

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death.

WARNING

This product contains or produces a chemical(s) which may cause death or serious illness and which are known by the State of California to cause cancer, birth defects or other reproductive harm.

CAUTION

This unit should not be used as a “construction heater” during the finishing phases of construction on a new structure. This type of use may result in premature failure of the unit due to extremely low return air temperatures and exposure to very dirty atmospheres.

Locating The Unit

WARNING

To avoid possible equipment damage, fire, personal injury, or death, the following points must be observed when installing the unit.

All Installations:

• For proper flame pattern within the heat exchanger

and proper condensate drainage, the unit must be mounted level.

• The unit should be as centralized as is practical with

respect to the air distribution system. This unit is for outdoor installation ONLY!

• The flue outlet hood 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 outdoor air intake/motorized outdoor 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. Common sources of such compounds include swimming pools and chlorine bleaches, paint stripper, adhesives, paints, varnishes, sealers, waxes (which are not yet dried) and solvents used during construction and remodeling. Various commercial and industrial processes may also be sources of chlorine/fluorine compounds.

• To avoid possible illness or death of the building oc-

cupants, do NOT locate outside air intake device (economizer, manual outdoor air intake, motorized outdoor air intake) too close to an exhaust outlet, gas vent termination, or plumbing vent outlet. For specific distances required, consult local codes.

• Allow clearances from the enclosure as shown in

Figure 1 for fire protection, proper operation, and service access. These clearances must be permanently maintained.

• The combustion air inlet and flue outlet hoods on

the front of the unit must never be obstructed. If used, do not allow the economizer/manual outdoor air damper/ motorized outdoor 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.

• When the unit is heating, the temperature of the re-

turn 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 the same physical size as the unit or slightly larger and 3 inches thick.

• The base should also be located where no run-off

of water from higher ground can collect in the unit.

• The feet on the unit may not be removed.

Rooftop Installations Only:

• To avoid possible property damage or personal injury, the roof must have sufficient structural strength to carry the weight of the unit(s) and snow or water loads as required by local codes.

• If horizontal air delivery is used, the unit may be installed directly on wood floors or on Class A, Class B, or Class C roof covering material, provided that the feet on the unit are not removed.

• To avoid possible personal injury, a safe, flat surface for service personnel should be provided.

• If vertical air discharge is used and the unit is installed on combustible flooring or class A, B, or C roofing material, then the Amana roof curb (PRC3A or PRC5A) listed on the unit nameplate is required.

III. General Information

WARNING

Improper installation, repair, operation or maintenance of this product may result in property damage, personal injury, or death from hazards such as fire, explosions, smoke, soot, condensation, electric shock or carbon monoxide.

This unit is approved only for an outdoor installation. 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. (ANSI Z223.1).

The heating and cooling capacities of the unit should be greater than or equal to the design heating and cooling loads of the area to be conditioned. The loads should be calculated by an approved method or in accordance with ASHRAE Guide or Manual J - Load Calculations published by the Air Conditioning Contractors of America.

Obtain from:

American National Standards Institute 1430 Broadway New York, NY 10018

Figure 1

Required Clearances For All Installations

Transportation Damage

All units are securely packed in shipping cartons approved by the International Safe Transit Association. The carton should be checked upon arrival for external damage. If damage is found, a request for inspection by carrier agent should be made in writing immediately.

The unit should be carefully inspected upon arrival for damage and bolts or screws which may have loosened in transit. In the event of damage, the consignee 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 the claim with the following supporting documents within the 9-month statute of limitations.

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. Follow local codes when disposing or recycling the packaging material.

IV. Rigging and Handling

CAUTION

To prevent possible property damage, the unit should remain in an upright position during all rigging and moving operations. To facilitate lifting and moving when a crane is used, place the unit in an adequate cable slide.

Important: If using bottom discharge with roof curb,

ductwork should be attached to the curb prior to installing the unit. Ductwork dimensions are shown in Amana Roof Curb Installation Instructions.

Refer to the Amana Roof Curb Installation Instructions for proper 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.

If using a fork lift, see Figure 2 for location of fork prongs. Make certain prongs support unit weight.

Locating The Thermostat

The thermostat should be mounted 5 feet above the floor, on a vibration free inside wall in a room or a hallway that has good air circulation.

Movement of air should not be obstructed by furniture, door, draperies, etc. The thermostat should not be mounted where it will be affected by drafts, hot or cold water pipes or air ducts in walls, radiant heat from fireplace, lamps, the sun, television, etc. Consult the Instruction Sheet packaged with the thermostat for mounting instructions.

All units have one stage of heating and one stage of mechanical cooling. Units which will have economizers may use thermostats with one or two stages of cooling.

Figure 2 Rigging

V. Gas Piping

IMPORTANT NOTE: This furnace is factory set to oper-

ate on natural gas at the altitudes shown on the rating plate. If operation at higher altitudes and/or propane gas operation is required, obtain and install the proper conversion kit(s) before operating this furnace. Failure to do so may result in unsatisfactory operation and/or equipment damage. (High altitude kits are for U.S. installations only.)

The rating plate is stamped with the model number, type of gas and gas input rating. Make sure the furnace is equipped to operate on the type of gas available.

INL ET GA S PRESSURE

Natural Min. 5.0" W.C., Max. 10.0" W.C.

Propane Min. 11.0" W. C. , M ax . 14. 0" W. C.

Inlet Gas Pressure Must Not Exceed the Maximum Value Shown in Table 3.

Table 3

The minimum supply pressure should not vary from that shown in the table above because this could prevent the furnace 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 furnace could result in premature heat exchanger failure.

High Altitude Derate (US. Installations Only Canadian Installations to 4500 Feet Only)

When this furnace is installed at altitudes above 2000 feet, the furnace input must be derated 4% for each 1000 feet above sea level because the density of the air is reduced.

In some areas the gas supplier will derate the heating value of the gas at a rate of 4% for each 1000 feet above sea level. If this is not done, smaller orifices will be required at altitudes above 3500 feet (non-derated natural gas) or 4500 feet (non-derated propane gas).

A different pressure switch will be required at altitudes more than 4000 feet above sea level. This is required regardless of the heat content of the fuel used.

High altitude kits can be purchased depending on the altitude and usage of propane or natural gas. Refer to the high altitude instruction manual included with this furnace to determine which high altitude components to use.

Adjustment of the manifold pressure to a lower pressure reading than what is specified on the furnace nameplate is not a proper derate procedure. With a lower density of air and a lower manifold pressure at the burner orifice, the orifice will not aspirate the proper amount of air into the burner. This can cause incomplete combustion of the gas, flashback, and possible yellow tipping.

Gas Piping

IMPORTANT NOTE: To avoid possible unsatisfactory

operation or equipment damage due to under firing of equipment, do not undersize the natural gas/propane piping from the meter/tank to the furnace. When sizing a trunk line as shown in Table 4, include all appliances on that line that could be operated simultaneously.

The rating plate is stamped with the model number, type of gas and gas input rating. Make sure the furnace is equipped to operate on the type of gas available.

The gas line installation must comply with local codes, or in the absence of local codes, with the latest edition of the National Fuel Gas Code (ANSI Z223.1).

Connecting The Gas Piping - Natural Gas

Natural Gas Capacity of Pipe

in Cubic Feet of Gas Per Hour (CFH)

Length of

Pipe in Feet 1/2 3/4 1 1 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

Press u re = .5 0 PSIG or l e ss and Pres sure Drop of 0.3" W .C. (Bas e d

Btuh Furnace Input

CFH=

Calorific Value of Gas

Nominal Black Pipe Si ze (inches)

on 0. 60 Spec ific G ravity Ga s)

Table 4

Refer to Figure 3 for the general layout at the furnace. The following rules apply:

1. Use black iron or steel pipe and fittings for the building piping.

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. Install a manual shut-off valve in a convenient location (within six feet of unit) between the meter and the unit.

7. Tighten all joints securely.

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