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York FG8 SERIES User Manual

York FG8 SERIES
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INSTALLATION
INSTRUCTIONS
CAUTION: READ ALL SAFETY GUIDES
BEFORE YOU START TO INSTALL
YOUR FURNACE.
SAVE THIS MANUAL
ALL POSITION
AUTOMATIC IGNITION FURNACES
G8C / FG8 SERIES MODELS
50 - 125 MBH INPUT
UPFLOW / HORIZONTAL
AUTOMATIC IGNITION FURNACES
G8C / FG8 SERIES MODELS
150 MBH INPUT
035-15241-003 Rev. A (201)
TABLE OF CONTENTS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . 2
FURNACE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . 3
PRE-INSTALLATION INSPECTION . . . . . . . . . . . . . . . . 4
CODE COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION POSITION
(50-125 MBH Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION POSITION
(150 MBH Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CONVERSION INFORMATION
(50-125 MBH Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
TO CONVERT FROM DOWNFLOW TO UPFLOW
CONFIGURATION (50-125 MBH Models) . . . . . . . . . . . 4
TO CONVERT FROM UPFLOW TO DOWNFLOW
CONFIGURATION (50-125 MBH Models) . . . . . . . . . . . 5
FURNACE LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . 6
COMBUSTION AND VENTILATION AIR . . . . . . . . . . . . 7
FURNACE SIZING AND DUCT
SYSTEM DESIGN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
RETURN AIR AND FILTERS . . . . . . . . . . . . . . . . . . . . . 9
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
VENTING (CATEGORY I) . . . . . . . . . . . . . . . . . . . . . . . 13
SIDEWALL VENTING . . . . . . . . . . . . . . . . . . . . . . . . . . 15
ELECTRICAL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . 15
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
PRE-OPERATIONAL CHECKS . . . . . . . . . . . . . . . . . . 19
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . 19
FURNACE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . 20
INSTALLATION CHECKS . . . . . . . . . . . . . . . . . . . . . . 21
SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . 22
REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . 22
EFFICIENCY
RATING
CERTIFIED
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York FG8 SERIES Specifications

General IconGeneral
BrandYork
ModelFG8 SERIES
CategoryFurnace
LanguageEnglish

Summary

General Information and Safety

Key Safety Warnings

Highlights critical safety warnings regarding improper installation, compliance, and furnace area usage.

Furnace Specifications

Pre-Installation Inspection and Code Compliance

Code Compliance Requirements

Details national and local codes for furnace installation, including NFGC and NEC.

Installation Position Options

50-125 MBH Models

Describes installation positions for 50-125 MBH models: upflow, downflow, or horizontal.

150 MBH Models

Specifies installation positions for 150 MBH models: upflow or horizontal.

Furnace Configuration Conversion (50-125 MBH Models)

Downflow to Upflow Conversion

Step-by-step guide to convert furnace from downflow to upflow configuration.

Upflow to Downflow Conversion (50-125 MBH)

Step-by-step guide to convert furnace from upflow to downflow configuration.

Furnace Location and Clearances

Clearances to Combustible Materials

Details minimum required clearances from the furnace to combustible materials for various configurations.

Combustion and Ventilation Air

Confined Space Air Requirements

Guidelines for providing combustion air in confined spaces, including opening size requirements.

Unconfined Space Air Requirements

Describes combustion air requirements for unconfined spaces and tight construction buildings.

Furnace Sizing and Duct System Design

Duct System Design Standards

Adherence to ASHRAE/NFPA 90 and local codes for duct system design is crucial for performance.

A/C Usage Duct Systems

Methods for integrating cooling coils with the furnace, including safety precautions for dampers.

Return Air and Filter Requirements

Return Air Temperature Limits

Specifies acceptable continuous return air temperature range for furnace operation.

Return Air Connection Configurations

Details on connecting return air ducts for upflow, downflow, and horizontal setups.

Filter Usage and Importance

Emphasizes filter necessity for system efficiency and equipment protection.

Gas Piping Installation and Safety

Gas Input Rate Checks

Checking Gas Input Rate

Procedure for determining and verifying gas input rate, including high altitude adjustments.

Venting (Category I) Requirements

Vent System Sizing

Guidance on proper sizing of the vent system for the furnace using NFGC tables.

Venting Into Existing Chimneys

Rules and considerations for venting into existing masonry or B-1 lined chimneys.

Condensation Prevention in Venting

Common Vent System Replacement

Sidewall Venting Procedures

Electrical Wiring and Grounding

Service Wiring and Control Wiring

Instructions for field wiring, polarity, and wiring diagrams for thermostat and accessories.

Electrical Grounding

Requirement for proper electrical grounding of the furnace casing according to codes.

Furnace Accessories and Wiring

Accessory Connections (EAC, HUM)

Guidance on wiring electronic air cleaners and humidifiers to the furnace control board.

Twin Furnace Installation

Instructions for wiring two furnaces to operate simultaneously using a common duct system.

Blower Motor Speed Selection

Blower Timings and Diagnostics

Blower Delay Timings Adjustment

Explanation of heating on/off delays and how to adjust the blower off delay timing.

Diagnostic Light Codes

Interpretation of diagnostic light flashes to identify furnace fault conditions and troubleshooting.

Wiring Diagram and Component Identification

Pre-Operational Checks

Sequence of Operation

Furnace Operation and Safety

Safe Operating Instructions

Crucial safety guidelines for operating the furnace, including gas leak detection and response.

Performance Checks and Adjustments

High Altitude Gas Orifices

Table showing proper gas orifice sizes for various altitudes for natural and LP gas.

Measuring Air Temperature Rise

Procedure for measuring air temperature rise and its importance for furnace performance.

Balancing the Air Distribution System

Service Instructions and Maintenance

Motor Lubrication and Burner Cleaning

Information on motor lubrication, burner cleaning, and flue gas passageways.

Replacement Parts Guidance

Guidance on ordering genuine authorized replacement parts for the furnace.

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