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507713-01

Page 31 of 32

Issue 1623

Blower Performance Data

Upflow / Horizontal 

Model

Motor 

Size 

(hp)

Blower 

Size

Temp 

Rise (

°F

)

Blower 

Speed

CFM @ External Static Pressure - “ w.c.

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

045A3

1/3

 

(4 spd)

10 x 8

15 - 45

High

1571

1527

1472

1399

1329

1223

1137

1020

Med/High

1332

1314

1277

1233

1186

1136

1008

929

Med

1115

1139

1127

1086

1050

994

926

819

Low

950

952

944

924

887

842

783

648

070A2

1/5

 

(3 spd)

10 x 7

40 - 70

High

1113

1086

1045

1014

964

891

811

713

Med/High

974

953

927

886

834

781

702

563

Low

822

791

775

733

702

637

562

422

070A3

1/3

 

(4 spd)

10 x 8

30 - 60

High

1579

1522

1479

1402

1338

1247

1158

1047

Med/High

1357

1333

1300

1268

1205

1125

1045

942

Med

1137

1131

1102

1080

1037

977

913

828

Low

958

956

943

925

879

837

777

725

090B3

1/3

 

(4 spd)

10 x 9

35 - 65

High

1724

1683

1631

1535

1469

1363

1257

1158

Med/High

1420

1410

1368

1314

1273

1183

1103

1002

Med

1171

1168

1150

1126

1084

1022

935

817

Low

973

978

957

927

908

840

784

680

090B4

1/2

 

(4 spd) 10 x 10

30 - 60

High

1911

1840

1770

1663

1584

1469

1357

1198

Med/High

1738

1707

1634

1560

1468

1364

1232

1121

Med

1533

1502

1462

1408

1329

1262

1157

1019

Low

1303

1304

1281

1225

1192

1116

1018

918

110C4

1/2

 

(4 spd) 10 x 10

30 - 60

High

2078

2017

1939

1848

1775

1679

1559

1425

Med/High

1791

1746

1693

1635

1573

1469

1349

1192

Med

1542

1547

1507

1472

1395

1322

1203

1060

Low

1334

1333

1321

1293

1237

1172

1050

909

110C5

3/4

 

(4 spd)

11 x 10

30 - 60

High

2420

2304

2247

2156

2067

1988

1890

1742

Med/High

2230

2173

2113

2056

1985

1891

1764

1653

Med

1987

1954

1901

1841

1800

1703

1618

1491

Low

1796

1759

1715

1674

1616

1552

1465

1359

135D5

3/4

 

(4 spd)

11 x 11

30 - 60

High

2120

2042

1972

1863

1747

1618

1488

1336

Med/High

2044

1948

1864

1790

1654

1563

1413

1312

Med

1886

1817

1762

1672

1603

1461

1357

1228

Low

1728

1664

1616

1526

1441

1366

1260

1136

Summary of Contents for GUH80A

Page 1: ...or equivalent service agency or the gas supplier WARNING Manufactured By Comfort Aire Century 1900 Wellworth Ave Jackson MI 49203 This manual must be left with the homeowner for future reference INST...

Page 2: ...Return air from both sides 5 Bottom and one side return air 2 Flue outlet may be horizontal but furnace must be vented vertically 3 Optional external side return air filter kit cannot be used with th...

Page 3: ...a licensed professional installer or equivalent service agency or the gas supplier WARNING Certifications These units are CSA International certified to ANSI Z21 47 In the USA installation of gas fur...

Page 4: ...tions are met The vent system must be permanently installed per these installation instructions A room thermostat must control the furnace The use of fixed jumpers that will provide continuous heating...

Page 5: ...to the house for combustion negative pressure outside pressure is greater than inside pressure will build to the point that a downdraft can occur in the furnace vent pipe or chimney As a result combus...

Page 6: ...aining 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 fur...

Page 7: ...area of at least one square inch per 2 000 Btu 645 mm per 59 kW per hour of the total input rating of all equipment in the enclosure If the equipment room is located against an outside wall and the ai...

Page 8: ...asher have been removed the rigid leg will not touch the blower 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...

Page 9: ...ity See Figure 9 2 Single side return air with optional return airbase See Figure 10 3 Bottom return air 4 Return air from both sides 5 Bottom and one side return air Figure 9 Single Side Return Air w...

Page 10: ...rs or ceiling joists When straps are used to suspend the unit in this way support must be provided for both the ends The straps must not interfere with the plenum or exhaust piping installation Coolin...

Page 11: ...wn the vent pipe and into the room This reverse flow of the flue gas may result in incomplete combustion and the formation of carbon monoxide gas This toxic gas might then be distributed throughout th...

Page 12: ...from 9 to 5 to avoid interference with inducer motor Mounting Screws Location Figure 15 Figure 16 UPFLOW POSITION Top Vent Discharge The combustion air inducer may be rotated clockwise or counterclock...

Page 13: ...ng must be brought into the unit from the bottom in order to accommodate the flue pipe Cut combustion air inducer tubing from 9 to 8 to avoid interference with inducer motor Remove make up box assembl...

Page 14: ...s WARNING Use self drilling sheet metal screws or a mechanical fastener to firmly secure the vent pipe to the round collar of the flue transition If self drilling screws are used to attach the vent pi...

Page 15: ...ey 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 seale...

Page 16: ...etween 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 crawl...

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: ...problem is found during any of the preceding tests the common venting system must be modified to correct the problem Resize the common venting system to the minimum vent pipe size determined by using...

Page 20: ...Configurations NOTE BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET Figure 27 NOTE BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET Figure 26 Table 6 Gas Pipe Capacity ft hr m hr Note Capacity...

Page 21: ...ice to protect the furnace s electronic controls Precautions will help to avoid control exposure to electrostatic discharge by putting the furnace the control and the technician at the same electrosta...

Page 22: ...on This terminal is energized in the heating mode when the combustion air inducer is operating Any humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit...

Page 23: ...507713 01 Page 23 of 32 Issue 1623 Wiring Diagram Figure 32 045 3 135 5 110 5 110 4 110 3 090 4 090 3 070 3 070 2...

Page 24: ...l The control stores the last 5 fault codes in non volatile memorty The most recent fault code is flashed first the oldest fault code is flashed last There is a 2 second pause between codes When the p...

Page 25: ...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 35 7 Wait five minutes to clear out any gas If...

Page 26: ...accurate 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 t...

Page 27: ...red at the pressure switch under steady state conditions after 15 minutes of run time against the as shipped switch set point Insufficient negative pressure may lead to nuisance pressure switch trips...

Page 28: ...heat anticipator setting if adjustable according to the amp draw listed on the wiring diagram that is attached to the unit NOTE Do not secure the electrical conduit directly to the air ducts or struct...

Page 29: ...rrectly Verify proper operation after servicing WARNING At the beginning of each heating season a qualified technician should check the system as follows Blower Check the blower wheel for debris and c...

Page 30: ...ate All service must be performed by a licensed professional installer or equivalent service agency or gas supplier Heating Parts Flame sensor Heat exchanger assembly Gas manifold Combustion air induc...

Page 31: ...1 1535 1469 1363 1257 1158 Med High 1420 1410 1368 1314 1273 1183 1103 1002 Med 1171 1168 1150 1126 1084 1022 935 817 Low 973 978 957 927 908 840 784 680 090B4 1 2 4 spd 10 x 10 30 60 High 1911 1840 1...

Page 32: ...mum 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 t...

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