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Whirlpool WFCU Installation Instructions Manual

90+ gas furnace
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90+ GAS FURNACE INSTALLATION INSTRUCTIONS
GAS FURNACE SAFETY................................................................1
INSTALLATION REQUIREMENTS ................................................3
Tools and Parts ............................................................................3
Location Requirements................................................................3
Installation Configurations ...........................................................4
Duct Work Requirements.............................................................5
Electrical Requirements ...............................................................5
Gas Supply Requirements ...........................................................5
Venting Requirements..................................................................5
INSTALLATION INSTRUCTIONS ..................................................6
Inspect Shipment .........................................................................6
Plan Vent System .........................................................................7
Determine Vent Pipe Direction.....................................................9
Connect Venting.........................................................................14
We have provided many important safety messages in this manual and on your appliance. Always read and obey all
safety messages.
This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol and either the word "DANGER" or
"WARNING." These words mean:
All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and tell you
what can happen if the instructions are not followed.
Models WFCU, WFCC, WGFDC, WGFDU
46948D003

Table of Contents

GAS FURNACE SAFETY

Your safety and the safety of others are very important.
Install Condensate Disposal.......................................................14
Install Duct Work ........................................................................15
Filter Specifications ....................................................................15
Make Electrical Connections .....................................................16
Make Gas Connections..............................................................17
Check the Furnace Input Rate ...................................................17
Adjust the Furnace Input Rate ...................................................18
Complete Installation..................................................................19
Sequence of Operation ..............................................................20
Controls ......................................................................................20
TROUBLESHOOTING ..................................................................21
ASSISTANCE OR SERVICE .........................................................24
Accessories ................................................................................24
You can be killed or seriously injured if you don't
immediately follow instructions.
You can be killed or seriously injured if you don't
follow instructions.
Whirlpool
®
Home Cooling and Heating
7901 S.W. 6th Court
Plantation, Florida 33324

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  • Page 1: Table Of Contents

    All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and tell you what can happen if the instructions are not followed. Whirlpool ® Home Cooling and Heating 7901 S.W. 6th Court Models WFCU, WFCC, WGFDC, WGFDU Plantation, Florida 33324 46948D003...
  • Page 2: Save These Instructions

    IMPORTANT SAFETY INSTRUCTIONS Use only with type of gas approved for this furnace. When a furnace is installed so that supply ducts Refer to the furnace rating plate. carry air circulated by the furnace to areas outside the space containing the furnace, the return air Install this furnace only in a location and position shall also be handled by duct(s) sealed to the as specified in the Location Requirements section...
  • Page 3: Installation Requirements

    Location Requirements INSTALLATION REQUIREMENTS These instructions are intended as a general guide only for use by qualified persons and do not supersede any national or local codes in any way. Compliance with all local, state, or national codes pertaining to this type of equipment should be determined prior to installation.
  • Page 4: Installation Configurations

    All models are suitable for closet or utility room installation. Utility room installation requires: Installation Configurations A door opening large enough for the widest part of the WGFDU and WFCU models must be installed only as upflow furnace. furnaces. A door opening large enough to remove/replace any other WGFDC and WFCC models must be installed only as appliance located in the utility room, such as a water heater.
  • Page 5: Duct Work Requirements

    Combustible Floor Installation (Counterflow Models only) In all instances, other than wiring for the thermostat, the wiring to be done and any replacement of wire shall conform with the temperature limitation for Type T wire – 63°F (35°C) rise. The line voltage supply should be routed through a readily accessible disconnect located within sight of the furnace.
  • Page 6: Installation Instructions

    Contaminated Combustion Air INSTALLATION Excessive exposure to contaminated combustion air will result in INSTRUCTIONS performance related problems. The recommended source of combustion air is outdoor air. Outdoor air as the source of combustion air If the furnace is installed in a confined space, it is recommended that the necessary combustion air come from the outdoors by way of an attic, crawl space, air duct, or direct opening.
  • Page 7: Plan Vent System

    In all installations, this screen should be installed at the Venting Options termination of the flue pipe. Flue Pipe Screen WFCU, WFCC, WGFDC and WGFDU models can be installed as either direct vent or non-direct vent units. For either type of installation, special venting considerations The flue pipe screen must be followed.
  • Page 8 Materials Vent Pipe Size and Length All pipe, fittings, primer, and solvent cement must conform The vent pipe and air intake pipe (in direct vent installations) with American National Standard Institute and the American should be sized in accordance with the information found in the Society for Testing and Materials (ANSI/ASTM) standards.
  • Page 9: Determine Vent Pipe Direction

    Vent Table - 112,000 - 125,000 BTU/HR Models In the event that the pipe length is in between the lengths listed in the Vent Table, use the next larger length listed. For example, if a Vent Pipe Minimum Pipe Diameter (in.) length of pipe needed to install the furnace is 27 ft, use the Length (ft) diameter values for the 30 ft row in the tables.
  • Page 10 Direct Vent Installation Upflow Models Refer to the appropriate vent table for proper pipe size, vent Direct Vent - Upflow (Vertical Venting) length and the number of elbows allowed, and air intake 6.5" Min. - 24" Max. length and the number of elbows allowed. 10 Ft.
  • Page 11 Non-Direct Vent Installation - Upflow Models Refer to appropriate tables for proper pipe size, vent length Non-Direct Vent Upflow - Vertical Venting and the number of elbows allowed. 10 Ft. Refer to the “Materials” section for the proper venting Min. material.
  • Page 12 Direct Vent Installation - Counterflow Models Refer to appropriate tables for proper pipe size, vent length Direct Vent Counterflow- Vertical Venting and the number of elbows allowed, and air intake length and the number of elbows allowed. 6.5" Min. - 24" Max. 10 Ft.
  • Page 13 Non-Direct Vent Installation- Counterflow Models Refer to appropriate tables for proper pipe size, vent length Non-Direct Vent Counterflow - Vertical Venting and the number of elbows allowed. 10 Ft. Refer to the “Materials” section for the proper venting Min. material. 2 Ft.
  • Page 14: Connect Venting

    Existing Venting Systems Connect Venting 1. Run venting to the furnace, see “Plan Vent System.” When an existing furnace is removed or replaced, the original venting system may no longer be sized to properly vent the 2. Attach the air intake pipe to the furnace connector. attached appliances.
  • Page 15: Install Duct Work

    WAFILTHA7 for single side return in installations requiring supplied with model WGFDU only. Filter rack and filters are not more than 1600 CFM nominal air delivery. supplied with models WFCU, WFCC, or WGFDC. (Models designed for more than 1600 CFM nominal air delivery include two of each.) Some model furnaces can be installed with either a side or bottom air return.
  • Page 16: Make Electrical Connections

    5. Using UL listed wire nuts, connect the field supply wires to Make Electrical Connections the furnace (black to black and white to white). WARNING Electrical Shock Hazard Disconnect power before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. WARNING Thermostat Install a room thermostat according to the instructions furnished...
  • Page 17: Make Gas Connections

    7. Remove the inlet pressure tap plug on the gas control valve and connect pressure gauge to the ¹⁄₈ in. NPT inlet Make Gas Connections pressure tap. IMPORTANT: This furnace requires conversion for use with 8. Turn on the gas supply at the manual gas shutoff valve. propane.
  • Page 18: Adjust The Furnace Input Rate

    9. Refer to the Manifold Pressure vs. Altitude chart for the Adjust the Furnace Input Rate correct manifold pressure. If necessary, remove the regulator adjusting cap on the gas valve and turn the regulator (if required) adjusting screw clockwise to increase pressure and input, or counterclockwise to decrease pressure and input.
  • Page 19: Complete Installation

    Adjust Blower Speed Complete Installation IMPORTANT: Do not use this furnace if any part has been under WARNING water. Immediately call a qualified person to inspect the furnace and to replace any part of the control system and gas control which has been under water.
  • Page 20: Sequence Of Operation

    “off” delay on heating. cause the switch to remain open. WFCU and WFCC models Rollout Switch(es) Feature a fixed blower “off” delay of 90 seconds which is one- time adjustable to 150 seconds. See the “Wiring Connection”...
  • Page 21: Troubleshooting

    Failure Codes TROUBLESHOOTING LED Status Fault Description (Flash Codes) No Power to the System Control Furnace Fails to Operate Properly Steady Flash Normal Operation (Standby or call for heat) Review “Sequence of Operation” and visually inspect the (11 or more following before troubleshooting: flashes Is the power to the furnace on?
  • Page 22 Wiring Connection Diagram - Honeywell ® SmartValve II ® Ignition System LINE VOLTAGE - FACTORY LINE VOLTAGE - FIELD LOW VOLTAGE - FACTORY LOW VOLTAGE - FIELD ROLLOUT ROLLOUT HIGH INDUCED SWITCH SWITCH LIMIT DRAFT (IF USED) BLOWER PRESSURE SWITCH SMARTVALVE LIMIT LIMIT...
  • Page 23 Wiring Schematic - Honeywell ® SmartValve II ® Ignition System EAC(S) NEUTRALS (IF USED) INTERLOCK SWITCH CLEANER CONSTANT NEUTRALS HEAT CIRCULATION COOL NEUTRALS INDUCED HUMIDIFIER DRAFT BLOWER SMVII (IF USED) IGNITION CONTROL IGNITER (120 VAC) NEUTRALS 120 VAC TRANSFORMER 24 VAC BLOWER CONTROL CENTER T’STAT CONDENSER...
  • Page 24: Assistance Or Service

    Combustible Floor Base (24.5" cabinets) Honeywell and SmartValve are trademarks of Honeywell International, Inc. 46948D003 ®/TM Whirlpool and all other trademarks are owned by Whirlpool, U.S.A., 4/03 © 2003. All rights reserved. used under license by Tradewinds Distributing Company, LLC.

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