Printed in U.S.A. 44004711302 12/5/2014
SERVICE AND TECHNICAL SUPPORT
MANUAL
Single Stage, PSC Blower Motor
35” Tall, High Efficiency Condensing Gas Furnace
WFAR080B048 (B Series Only)
WFAR (All C Series)
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Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and NOTE
The signal words DANGER, WARNING,
CAUTION, and NOTE are used to identify levels of
hazard seriousness. The signal word DANGER is
only used on product labels to signify an immediate
hazard. The signal words WARNING, CAUTION,
and NOTE will be used on product labels and
throughout this manual and other manual that may
apply to the product.
DANGER -- Immediate hazards which will result in
severe personal injury or death.
WARNING -- Hazards or unsafe practices which
could result in severe personal injury or death.
CAUTION -- Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE -- Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
!
WARNING
Signal Words in Manuals
The signal word CAUTION is used throughout
this manual in the following manner:
!
CAUTION
Signal Words on Product Labeling
Signal words are used in combination with
colors and/or pictures or product labels.
The signal word WARNING is used throughout
this manual in the following manner:
Safety--alert symbol
When you see this symbol on the unit and in
instructions or manuals, be alert to the
potential for personal injury.
TABLE OF CONTENTS
START--UP, ADJUSTMENT, AND SAFETY CHECK 3....
GENERAL 3........................................
PRIME CONDENSATE TRAP WITH WATER 3..........
PURGE GAS LINES 3...............................
ADJUSTMENTS 3..................................
CHECK INLET GAS PRESSURE 4....................
ADJUST MANIFOLD PRESSURE 5...................
ADJUST TEMPERATURE RISE 6.....................
ADJUST BLOWER OFF DELAY (HEAT MODE) 7.......
BLOWER OFF DELAY JUMPER POSITIONS 7.........
ADJUST COOLING AIRFLOW 7......................
ADJUST THERMOSTAT HEAT ANTICIPATOR 7........
CHECK SAFETY CONTROLS 7......................
CHECKLIST 7......................................
ALTITUDE DERATE MULTIPLIER. 8..................
GAS RATE (CU FT./HR) 9............................
ORIFICE SIZE AND MANIFOLD PRESSURE 11.........
AIR DELIVERY -- CFM 13.............................
SERVICE AND MAINTENANCE PROCEDURES 14......
PRESSURE SWITCHES 14...........................
CLEANING HEAT EXCHANGERS 20...................
SEQUENCE OF OPERATION 24......................
PARTS REPLACEMENT INFORMATION GUIDE 28......
MODELS
WFAR040A030C
WFAR060B048C
WFAR080B048B
WFAR080B048C
WFAR080C060C
WFAR100C048C
WFAR100C060C
WFAR120D060C
Use of the AHRI Certified TM Mark indicates a
manufacturer’s participation in the program.
For verification of certification for individual
products, go to www.ahridirectory.org .
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