Grandaire WFAR Series, Service And Technical Support Manual

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Printed in U.S.A.
440 04 7113 02
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)
Save this manual for future reference.
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 .