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INSTALLATION
INSTRUCTION
TWO-STAGE
ULTRA
MID-EFFICIENCY GAS-FIRED
VARIABLE SPEED FURNACES
Upflow / Horizontal
Models: P*DU - “V” / G8V / L8V
80 To 120 MBH Input
035-17438-001 Rev. A (901)
EFFICIENCY
RATING
CERTIFIED
CAUTION:
READ ALL SAFETY GUIDES BEFORE YOU
START TO INSTALL YOUR FURNACE.
SAVE THIS MANUAL
TABLE OF CONTENTS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . 2
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
VENTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
AIRFLOW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
OPERATION AND MAINTENANCE . . . . . . . . . . . . . . . 18
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 22
FURNACE ACCESSORIES . . . . . . . . . . . . . . . . . . . . . 25
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26