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66832-UIM-D-1205

EFFICIENCY

RATING

CERTIFIED

ISO 9001

Certified Quality

Management System

HIGH EFFICIENCY

CLAM TUBE HEAT EXCHANGER SERIES

MODELS: G8C/GF8

(Single Stage Multi-Position)

50 - 150 MBH INPUT

(14.65 - 44.00 KW) INPUT

INSTALLATION MANUAL

SECTION I: SAFETY

This is a safety alert symbol. When you see this symbol on

labels or in manuals, be alert to the potential for personal

injury.

Understand and pay particular attention to the signal words DANGER,

WARNING, or CAUTION.

DANGER indicates an imminently hazardous situation, which, if not

avoided, will result in death or serious injury

WARNING indicates a potentially hazardous situation, which, if not

avoided, could result in death or serious injury

CAUTION indicates a potentially hazardous situation, which, if not

avoided may result in minor or moderate injury.

It is also used to

alert against unsafe practices and hazards involving only property dam-

age.

Improper installation may create a condition where the operation of

the product could cause personal injury or property damage.

Improper installation, adjustment, alteration, service or mainte-

nance can cause injury or property damage. Refer to this manual

for assistance or for additional information, consult a qualified con-

tractor, installer or service agency.

This product must be installed in strict compliance with the installa-

tion instructions and any applicable local, state, and national codes

including, but not limited to building, electrical, and mechanical

codes.

TABLE OF CONTENTS

SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

ACCESSORY CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

TWINNING AND STAGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

VENT/COMBUSTION AIR SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . .16

SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . .22

LIST OF FIGURES

Upflow/Horizontal Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Downflow/Horizontal Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Vent Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Top Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Typical Attic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Typical Suspended Furnace / Crawl Space Installation . . . . . . . . . . . . 9

Side Return Cutout Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Horizontal Mount and Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Downflow Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Return Filter Grill and Return Duct Installation . . . . . . . . . . . . . . . . . . 11

Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Upflow Configuration (50-125 MBH Model Only) . . . . . . . . . . . . . . . . 12

Downflow Configuration (50-125 MBH Model Only) . . . . . . . . . . . . . 12

Upflow/Horizontal Configuration (150 MBH Model Only) . . . . . . . . . . 12

Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Electrical Wiring - Upflow Position . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Line Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Two-Stage Heating and Cooling Thermostat Connections . . . . . . . . 14

Accessory Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Typical Twinned Furnace Application . . . . . . . . . . . . . . . . . . . . . . . . .15

Single Stage Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . .15

Two-Stage Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . .16

Vent Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Alternate Air Intake, Air Outlet and Chimney Connections . . . . . . . . .17

Air Inlet, Outlet and Chimney Connections . . . . . . . . . . . . . . . . . . . . .17

Typical Sidewall Vent Application . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Typical Sidewall Vent and Termination Configuration . . . . . . . . . . . .18

Typical Chimney Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Horizontal Air Inlet, Outlet and Chimney Connections . . . . . . . . . . . .18

Home Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Combustion Airflow Path Through The Furnace

Casing to the Burner Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . .21

Pressure Switch Tubing Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Typical Heat/Cool Speed Tap Connections . . . . . . . . . . . . . . . . . . . .26

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

LIST OF TABLES

Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Minimum Duct Sizing For Proper Airflow . . . . . . . . . . . . . . . . . . . . . . . 6

External Static Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Cabinet and Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Filter Sizes - Upflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

High Altitude Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Ratings & Physical / Electrical Data - Upflow Models . . . . . . . . . . . . 13

Roof Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Horizontal Sidewall Venting Clearances . . . . . . . . . . . . . . . . . . . . . . .18

Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Unconfined Space Minimum Area in Square Feet . . . . . . . . . . . . . . .20

Field Installed Accessories - Non Electrical . . . . . . . . . . . . . . . . . . . .23

Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Filter Performance - Pressure Drop Inches W.C. and (kPa) . . . . . . . .26

Blower Performance - CFM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

1 2 3 4 5 6 ... 27 28

Inhaltsverzeichnis

Seite 1 - INSTALLATION MANUAL

66832-UIM-D-1205EFFICIENCYRATINGCERTIFIEDISO 9001Certified QualityManagement SystemHIGH EFFICIENCYCLAM TUBE HEAT EXCHANGER SERIESMODELS: G8C/GF8(Singl

Seite 2 - SAFETY REQUIREMENTS

66832-UIM-D-120510 Unitary Products GroupSIDE RETURN/BOTTOM EXTERNAL INSTALLATIONLocate and knock out the square corner locators. These indicate thesi

Seite 3

66832-UIM-D-1205Unitary Products Group 11Filter(s) may be located in the duct system external to the furnace usingan external duct filter box attached

Seite 4 - SECTION II: DUCTWORK

66832-UIM-D-120512 Unitary Products GroupGAS PIPING INSTALLATIONProperly sized wrought iron, approved flexible or steel pipe must beused when making g

Seite 5 - TRANSITION

66832-UIM-D-1205Unitary Products Group 13GAS ORIFICE CONVERSION FOR PROPANE (LP)This furnace is constructed at the factory for natural gas-fired opera

Seite 6 - Upflow Instructions

66832-UIM-D-120514 Unitary Products GroupSUPPLY VOLTAGE CONNECTIONS1. Provide a power supply separate from all other circuits. Installovercurrent prot

Seite 7 - Unitary Products Group 7

66832-UIM-D-1205Unitary Products Group 15TWINNING DUCT SYSTEMTwinned furnaces must only be applied on a common duct system. Asingle air supply plenum

Seite 8

66832-UIM-D-120516 Unitary Products GroupSTAGINGIn applications where more heating capacity or more airflow capacity isneeded than what one furnace ca

Seite 9 - SECTION III: FILTERS

66832-UIM-D-1205Unitary Products Group 17CATEGORY 1 - 450 F. MAX. VENT TEMP.The venting system must be installed in accordance with Section 5.3,Air fo

Seite 10

66832-UIM-D-120518 Unitary Products GroupVENT PIPING ASSEMBLYThe final assembly procedure for the vent piping is as follows:1. Cut piping to the prope

Seite 11 - SECTION IV: GAS PIPING

66832-UIM-D-1205Unitary Products Group 19VENT CLEARANCES† A vent shall not terminate directly above a sidewalk or paved driveway that is located betwe

Seite 12 - CHECKING THE GAS PRESSURES

66832-UIM-D-12052 Unitary Products GroupSPECIFIC SAFETY RULES AND PRECAUTIONS1. Only Natural gas or Propane (LP) gas are approved for use withthis fur

Seite 13 - SECTION V: ELECTRICAL POWER

66832-UIM-D-120520 Unitary Products GroupAmbient Combustion Air Supply This type installation will draw the air required for combustion fromwithin the

Seite 14

66832-UIM-D-1205Unitary Products Group 21Ventilated Combustion AirThe ventilated attic space or a crawl space from which the combustionair is taken mu

Seite 15

66832-UIM-D-120522 Unitary Products GroupSECTION IX: SAFETY CONTROLSCONTROL CIRCUIT FUSEA 3-amp fuse is provided on the control circuit board to prote

Seite 16

66832-UIM-D-1205Unitary Products Group 23TOOLS AND INFORMATION THAT WILL BE REQUIRED IN ORDER TO PROPERLY PERFORM THE FURNACE STARTUP PROCEDURE.1. Cal

Seite 17

66832-UIM-D-120524 Unitary Products GroupIn the USA use the following formula to calculate the furnace input.For natural gas multiply the heat content

Seite 18 - VENT PIPING ASSEMBLY

66832-UIM-D-1205Unitary Products Group 25IMPORTANT: The inlet gas pressure operating range table specifieswhat the minimum and maximum gas line pressu

Seite 19

66832-UIM-D-120526 Unitary Products GroupThe temperature rise, or temperature difference between the return airand the heated supply air from the furn

Seite 20 - 20 Unitary Products Group

66832-UIM-D-1205Unitary Products Group 27Input / Output / CFM / Cabinet Width (A=14-1/2, B=17-1/2, C=21, D=24-1/2)Motor voltage is 115VAC.TABLE 18: Bl

Seite 21 - Ventilated Combustion Air

Seite 22 - ADJUSTMENTS

66832-UIM-D-1205Unitary Products Group 3• Furnace shall be installed so the electrical components are pro-tected from water.• Installing and servicing

Seite 23

66832-UIM-D-12054 Unitary Products GroupInstallation in a residential garage:A gas-fired furnace for installation in a residential garage must beinsta

Seite 24 - 24 Unitary Products Group

66832-UIM-D-1205Unitary Products Group 5TO CONVERT FROM DOWNFLOW TO UPFLOW CONFIGURATION (50-125 MBH Models)1. Lay the furnace on its back.2. Remove t

Seite 25 - Natural Gas Propane (LP)

66832-UIM-D-12056 Unitary Products Group10. Rotate the vent blower 180º so that its outlet points toward the inletair end of the furnace. See Figure 2

Seite 26 - SWITCHES

66832-UIM-D-1205Unitary Products Group 7TABLES 2 and 3 are to be used as a guide only to help the installerdetermine if the duct sizes are large enoug

Seite 27 - NOT ALLOWED

66832-UIM-D-12058 Unitary Products GroupRESIDENTIAL AND NON HUD MODULAR HOME UPFLOW RETURN PLENUM CONNECTIONReturn air may enter the furnace through t

Seite 28 - SECTION XI: WIRING DIAGRAM

66832-UIM-D-1205Unitary Products Group 9Horizontal Installations With a Cooling Coil CabinetThe furnace should be installed with coil cabinet part num

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