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506843-01

Page 1  of  39

Issue 1132

This is a safety alert symbol and should never be ignored.  When you see this symbol on labels or in

manuals, be alert to the potential for personal injury or death.

As with any mechanical equipment, personal injury can

result from contact with sharp sheet metal edges.  Be

careful when you handle this equipment.

  CAUTION

Improper installation, adjustment, alteration, service or

maintenance can cause property damage, personal injury

or loss of life.  Installation and service must be performed

by a licensed professional installer (or equivalent), service

agency or the gas supplier.

  WARNING

This manual must be left with the homeowner for future reference.

INSTALLATION INSTRUCTIONS

GDD80C

Warm Air Gas Furnace

 

Downflow Air Discharge

(P) 506843-01

*P506843-01*

Unit Dimensions .............................................................. 2

GDD80C 

Parts Arrangement

 

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........................

.......

 

3

GDD80C

 Gas Furnace

 

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4

Shipping and Packing List ............................................... 4

Safety Information .......................................................... 4

Use of Furnace as a Construction Heater ....................... 5

General .......................................................................... 6

Combustion, Dilution, Ventilation Air ................................. 6

Setting Equipment ........................................................... 9

Filters ........................................................................... 12

Duct System ................................................................. 12

Venting ......................................................................... 12

Gas Piping .................................................................... 21

TABLE OF CONTENTS

Electrical ..................................................................... 22

Unit Start-Up ............................................................... 27

Heating Sequence of Operation ................................. 28

Gas Pressure Adjustment ........................................... 28

Control Settings .......................................................... 28

High Altitude ................................................................ 29

Other Unit Adjustments .............................................. 29

Blower Performance .................................................... 31

Service ........................................................................ 32

Planned Service ........................................................... 35

Control Diagnostic Codes .............................................. 35

Repair Parts List ........................................................... 36

Start-Up Check List ....................................................... 37

Manufactured By

Comfort-Aire / Century

1900 Wellworth Ave.

Jackson, MI 49203

Summary of Contents for Century GDD80C

Page 1: ...ING This manual must be left with the homeowner for future reference INSTALLATION INSTRUCTIONS GDD80C Warm Air Gas Furnace Downflow Air Discharge P 506843 01 P506843 01 UnitDimensions 2 GDD80CPartsArr...

Page 2: ...DD80C Unit Dimensions inches mm FRONT VIEW SIDE VIEW A 368 14 1 2 Model GDD80C B C in mm in mm in mm 340 13 3 8 330 13 533 21 504 19 7 8 495 19 1 2 D in mm 203 8 121 4 3 4 070B3 090B4 110C5 045A3 446...

Page 3: ...01 Page 3 of 39 Issue 1132 Expanded View Figure 1 BLOWER ASSEMBLY CABINET CONTROL BOX INTERNAL FLUE PIPE ASSEMBLY FLUE CHASE HEAT EXCHANGER GAS VALVE ACCESS PANEL BURNER BOX ASSEMBLY COMBUSTION AIR I...

Page 4: ...by a licensed professional installer or equivalent service agency or the gas supplier WARNING Certifications These units are CSAInternational certified to ANSI Z21 47 In the USA installation of gas f...

Page 5: ...m thermostat must control the furnace The use of fixed jumpers that will provide continuous heating is not allowed The return air duct must be provided and sealed to the furnace Return air temperature...

Page 6: ...wndraft can occur in the furnace vent pipe or chimney As a result combustion gases enter the living space creating a potentially dangerous situation In the absence of local codes concerning air for co...

Page 7: ...ining the furnace the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace This is especially important when the furn...

Page 8: ...et and outlet air openings shall each have a free area of at least one square inch per 4 000 Btu 645 mm per 1 17 kW per hour of the total input rating of all equipment in the enclosure Figure 5 EQUIPM...

Page 9: ...er housing Setting Equipment WARNING Do not install the furnace on its front or its back Do not connect the return air ducts to the back of the furnace Doing so will adversely affect the operation of...

Page 10: ...ce may be installed on a combustible wood floor if an optional additive base is installed between the furnace and the combustivle floor WARNING Improper installation of the furnace can result in perso...

Page 11: ...s for correctly sized opening in floor and installation of cabinet 2 When cooling cabinet is in place set and secure the furnace according to the instructions that are provided with the cooling coil S...

Page 12: ...red for the unit to operate properly A filter must be in place any time the unit is operating Duct System Use industry approved standards such as those published by Air Conditioning Contractors of Ame...

Page 13: ...for common venting A chimney with one or more sides exposed to the outside of the structure is considered to be an exterior chimney An exterior masonry chimney that is not tile lined must be lined wit...

Page 14: ...ney Never connect a Category I appliance to a chimney that is servicing a solid fuel appliance If a fireplace chimney flue is used to vent this appliance the fireplace opening must be permanently seal...

Page 15: ...nts between sections of single wall connector piping shall be fastened by screws or other approved means 13 When the vent connector used for Category I appliances must be located in or pass through a...

Page 16: ...onfigureations with zero lateral lengths are assumed to have no elbows in the vent system For all other vent configurations the vent system is assumed to have two 90 elbows For each additional 90 elbo...

Page 17: ...onfigureations with zero lateral lengths are assumed to have no elbows in the vent system For all other vent configurations the vent system is assumed to have two 90 elbows For each additional 90 elbo...

Page 18: ...Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances Common Vent Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving...

Page 19: ...Two or more Category I Appliances Table 8 NOTE Single appliance venting configureations with zero lateral lengths are assumed to have no elbows in the vent system For all other vent configurations the...

Page 20: ...are located and other spaces of the building Turn on clothes dryers and any appliances not connected to the common venting system Turn on any exhaust fans such as range hoods and bathroom exhausts so...

Page 21: ...The piping must be supported at proper intervals every 8 to 10 feet 2 44 to 3 01 m with suitable hangers or straps Install a drip leg in vertical pipe runs to the unit 5 A 1 8 N P T plugged tap or pr...

Page 22: ...gas lines gas valve must be disconnected and isolated See Figure 19 Gas valves can be damaged if subjected to pressures greater than 1 2 psig 3 48 kPa 14 inches w c IMPORTANT Electrostatic discharge c...

Page 23: ...25 for integrated control configuration This terminal is energized when the indoor blower is operating Any accessory rated up to one amp can be connected to this terminal with the neutral leg of the...

Page 24: ...hermostat instructions Indoor Blower Speeds 1 When the thermostat is set to FAN ON the indoor blower will run continuously on the fan speed when there is no cooling or heating demand 2 When the unit i...

Page 25: ...506843 01 Page 25 of 39 Issue 1132 Wiring Diagram Figure 23 045A3M 070B3M 045A3M 090B4M 110C5M...

Page 26: ...506843 01 Page 26 of 39 Issue 1132 Typical Field Wiuring Diagram Figure 24 Figure 25 Integrated Control Automatic Hot Surface Ignition System...

Page 27: ...ns exactly a fire or explosion may result causing property damage personal injury or death WARNING 6 Move switch on gas valve to OFF Do not force See Figure 26 7 Wait five minutes to clear out any gas...

Page 28: ...curate reading shut off all other gas appliances connected to meter Supply Pressure Measurement A threaded plug on the inlet side of the gas valve provides access to the supply pressure tap Remove the...

Page 29: ...lower is deenergized Longer off delay settings provide lower return air temperatures shorter settings provide higher return air temperatures See Figure 28 Table 12 For Safety shut unit off and remove...

Page 30: ...rn off electrical power to furnace 2 Remove blower access panel 3 Disconnect existing speed tap at integrated control speed terminal NOTE Termination of any unused motor leads must be insulated 4 Plac...

Page 31: ...60 415 1425 300 240 1225 215 0 40 1615 430 1395 310 255 1185 0 50 1570 450 325 1210 265 1145 240 0 60 1545 465 340 1165 280 1085 315 0 70 N A 350 1120 295 1040 265 0 80 N A 365 1080 305 280 Low cfm Wa...

Page 32: ...connections 2 Check for the correct voltage at the furnace furnace operating Correct voltage is 120VAC 10 3 Check amp draw on the blower motor with inner blower panel in place Unit Nameplate_________...

Page 33: ...ve the combustion air inducer to avoid damaging blower gasket If gasket is damaged it must be replaced to prevent leakage 5 Remove the collector box located behind the combustion air inducer Be carefu...

Page 34: ...x inserts 16 Reinstall collector box and combustion air assembly Reinstall all screws to the collector box and combustion air inducer Failure to replace all screws may cause leaks Inspect gaskets for...

Page 35: ...seal between the return air and the room where the furnace is installed Return air duct Must be properly attached and provide an air seal to the unit Operating performance Unit must be observed during...

Page 36: ...epair parts are available through independent Allied Air dealers When ordering parts include the complete furnace model number listed on the CSA International nameplate Example GDD80C045A3M All servic...

Page 37: ...506843 01 Page 37 of 39 Issue 1132 Start Up Performance Check List UNIT SET UP...

Page 38: ...506843 01 Page 38 of 39 Issue 1132 UNIT OPERATION...

Page 39: ...imum height of eight 8 feet above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment The sign shall read in print size no less...

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