Rheem RGRK-12ERAJS Series Installation Instructions Manual page 55

GAS FURNACE (DIRECT
DRIVE) INSTRUCTIONS
FOR CHANGING BLOWER
SPEED
WARNING
DISCONNECT THE ELECTRICAL
SUPPLY TO THE FURNACE
BEFORE ATTEMPTING TO
CHANGE THE BLOWER SPEED.
FAILURE TO DO SO CAN CAUSE
ELECTRICAL SHOCK RESULTING
IN PERSONAL INJURY OR DEATH.
The blower motor is wired for blower
speeds required for normal operation
as shown.
If additional blower speed taps are
available (leads connected to "M1"
and "M2" on the IFC), speeds may be
changed if necessary to fit
requirements of the particular
installation. Reconnect the unused
motor leads to "M1" or "M2" on the
Integrated Furnace Control Board
(IFC). Check motor lead color for
speed designation.
Heating speeds should not be
reduced where it could cause the
furnace air temperature to rise to
exceed the maximum outlet air
temperature specified for the unit.
IMPORTANT: Any combination of
motor taps to the IFC can be used
provided the temperature rise is
within the specified range when in
high or low heat and that there is
enough airflow in the cooling mode.
When changing the motor tap
speeds, the temperature rise must be
checked on both heat speeds and
temperature drop in cooling must be
checked again after the change is
made to ensure that the temperatures
are within the required specified
ranges.
55