35
PRESSURE SWITCHES
This furnace has two pressure
switches for sensing a blocked vent
condition. One is for high pressure and
the other for low pressure. When the
draft inducer is running on high speed,
both switches will normally close. when
running on low inducer speed, only the
low pressure switch will close. If there
is a blocked vent condition, failed
inducer motor or leak in the pressure
switch hoses, the pressure switch
contacts will remain open. The
“STATUS” light will blink twice,
indicating a pressure switch problem.
The high fire pressure switch is located
in the upper position on the furnace.
LUBRICATION
The blower motor and induced draft
motor are permanently lubricated by
the manufacturer and do not require
further attention.
The motor must be cleaned
periodically by a qualified installer,
service agency, or the gas supplier to
prevent the possibility of overheating
due to an accumulation of dust and dirt
on the windings or on the motor
exterior. And, as suggested elsewhere
in these instructions, the air filters
should be kept clean because dirty
filters can restrict airflow and the motor
depends upon sufficient air flowing
across and through it to keep from
overheating.
Reference Figure 29 for proper
removal of blower assembly on
downflow models.
FIGURE 29
DOWNFLOW BLOWER REMOVAL
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