Luxaire P*DU & G8D-UH series User Manual

CONTENTS
GENERAL INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . 3
UNIT INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
VENTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
UPFLOW/HORIZONTAL MODELS - . . . . . . . . . . . . . . . . 10
FILTERS INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . 10
UPFLOW/HORIZONTAL MODELS - . . . . . . . . . . . . . . . . 11
DOWNFLOW MODEL APPLICATION . . . . . . . . . . . . . . . 12
OPERATION AND MAINTENANCE. . . . . . . . . . . . . . . . . 23
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
FURNACE ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . 28
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . 29
WIRING DIAGRAM - UPFLOW / HORIZONTAL . . . . . . . 30
WIRING DIAGRAM - DOWNFLOW . . . . . . . . . . . . . . . . . 31
INSTALLATION
INSTRUCTION
CAUTION: READ ALL SAFETY GUIDES BEFORE YOU
START TO INSTALL YOUR FURNACE.
SAVE THIS MANUAL
TWO-STAGE
MID-EFFICIENCY GAS-FIRED
TUBULAR HEAT EXCHANGER SERIES
MODELS: P*DU & G8D-UH (Upflow / Horizontal)
P*DD & G8D-DN (Downflow)
57 - 120 MBH INPUT
035-14527-000 REV A (599) Form 650.77-N3U
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Open windows.
• Do not touch any electrical switch;do not use any phone in
your building.
• Extinguish any open flame.
• Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire depart-
ment.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and liq-
uids in the vicinity of this or any other appliance.

Luxaire P*DU & G8D-UH series Specifications

General

Series	P*DU & G8D-UH
Category	Furnace
Efficiency	Up to 96% AFUE
Heating Capacity	40, 000 to 120, 000 BTU/h
Fuel Type	Gas
Blower Type	Variable Speed
Warranty	10-Year Parts

Summary

Unit Installation

Combustion Air Requirements

Furnace Safety Controls

Describes the various safety devices and their functions within the furnace.

Checking Gas Input

Details how to measure and verify the gas input rate.

Ignition System Checkout and Adjustment

Explains how to test and adjust the ignition system.

Manifold Gas Pressure Adjustment

Guides on setting and verifying gas manifold pressure for optimal operation.

Temperature Rise Adjustment

Instructions for adjusting blower speed to achieve correct temperature rise.

Fan-Off Control Settings Adjustment

Venting

Category I Vertical Venting

Vent Safety Check Procedure

Provides steps to ensure the safe and proper operation of the venting system.

Upflow/Horizontal Models

Upflow Application

Horizontal Application

Downflow Model Application

Gas Piping Installation

Instructions for safe and compliant gas piping connections.

Electrical Power Connection

Details on making the main electrical power connection to the unit.

Electrical Control Connections

Troubleshooting

Furnace Control Diagnostics

Explains how to interpret fault codes and diagnose control issues.

Wiring Diagrams

Upflow / Horizontal Models Wiring Diagram

Provides the electrical wiring schematic for upflow/horizontal furnaces.

Downflow Models Wiring Diagram