Upflow, Upflow/Horizontal, and Downflow Induced Draft Gas Furnaces Installation Instructions - GPH, GPJ, GLH & GLJ Series - Installation checklist and safety precautions

Oct 23, 2026

Uploaded by Eliana

Installation instructions for Upflow, Upflow/Horizontal, and Downflow induced draft gas furnaces covering the GPH, GPJ, GLH, and GLJ series. Includes an installation checklist used before troubleshooting, covering gas supply, electrical wiring, venting, combustion air, furnace installation clearances, temperature rise, external static pressure, and ducting requirements. Provides safety information emphasizing approved gas type, outdoor vent discharge, leak testing with soap solution, proper temperature-rise range, sealed return-air ducting, and residential garage burner elevation requirements.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages36

Reading Time1 h 31 min

AccessFree to download

Installation Checklist

Gas Supply

Electrical

Venting

Combustion Air

Furnace Installation

Safety Precautions

Approved gas type and location

Venting requirements and leak testing

Temperature-rise and duct system limits

INSTALLATION INSTRUCTIONS FOR UPFLOW, UPFLOW/HORIZONTAL, AND DOWNFLOW INDUCED DRAFT GAS FURNACES (-)GPH,(-)GPJ,(-)GLH & (-)GLJ SERIES 92-24161-08-03 SUPERSEDES 92-24161-08-02 Before beginning any troubleshooting procedure, complete the following installation checklist. A furnace malfunction is sometimes caused by an improper installation. By completing this checklist, the problem may be found and corrected. Make copies of the checklist and complete one for every Low Profile Furnace service call for your records. INSTALLATION CHECKLIST (Refer to this manual for specifics.) GAS SUPPLY Adequate pipe size No gas leaks Proper supply and manifold gas pressure (check with an accurate U-tube manometer with the furnace and all other gas appliances operating.) ELECTRICAL Correct thermostat and subbase Thermostat model Subbase model Correct thermostat mode and setting Correct line supply voltage Correct power supply polarity is required with electronic ignition Correct furnace ground to electrical panel DC microamp (µA) flame signal (hot surface ignition units) ~~ ~~ Correct control voltage Measure and set heat anticipator amperage Air conditioning low voltage wires connected to terminals “Y”“C” -not with wire nuts VENTING Correct vent pipe diameter and length (according to CSA tables) Vent connection size Correct venting material (according to CSA tables) Correct lining for masonry chimneys Adequate clearance from combustibles Proper negative pressure reading in the vent Vent pipe secured to induced draft blower housing COMBUSTION AIR Proper source of combustion air Correct combustion air opening size FURNACE INSTALLATION Adequate clearance from combustibles Adequate clearance for service Proper air temperature rise (See furnace rating plate) External static pressure inches w.c. Correct filter(s) Correct cooling coil or accessories (if equipped) Adequate supply and return air ducting Return Air Duct Size Supply Air Duct Size Air ducts sealed to prevent leakage | CONTENTS
Safety Precautions ...................................................................................................4
Installation Check List ..............................................................................................2
General Information ..................................................................................................5
Location Requirements and Considerations ............................................................5
Combustion and Ventilation Air ..............................................................................10
Vent Pipe Installation .............................................................................................. 13
Gas Supply and Piping ........................................................................................... 16
Electrical Wiring......................................................................................................20
Accessories ............................................................................................................21
Start-Up Procedures...............................................................................................24
Air Flow ...................................................................................................................26
Maintenance...........................................................................................................30
Troubleshooting......................................................................................................33
Wiring Diagrams .....................................................................................................35 | | --- | | IMPORTANT: TO INSURE PROPER INSTALLATION AND OPERATION OF THIS PRODUCT, COMPLETELY READ ALL INSTRUCTIONS PRIOR TO ATTEMPTING TO ASSEMBLE, INSTALL, OPERATE, MAINTA

FAQs

What should be completed before troubleshooting a furnace malfunction?

Complete the installation checklist first. An improper installation is a common cause, and completing the checklist can help identify and correct the problem.

How should gas leaks be tested according to these instructions?

Never test for gas leaks with an open flame. Use a commercially available soap solution specifically made to detect leaks and check all connections.

What venting requirement is emphasized for combustion products?

Combustion products must be discharged outdoors, and the furnace must be connected to an approved vent system as specified in the vent pipe installation section.

Oct 23, 2026

Uploaded by Eliana