Rheem Manufacturing 1x2000, Руководство по установке

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27
SAFETY FEATURES
LIMIT CONTROL
The high limit cut-off is set at the
factory and cannot be adjusted. It is
calibrated to prevent the air
temperature leaving the furnace from
exceeding the maximum outlet air
temperature. If temperature exceeds
the maximum outlet air temperature,
the limit will shut the furnace down.
Reasons which could cause the outlet
temperature to exceed the range are
failed indoor blower, dirty filters, etc.
OVER TEMPERATURE
SWITCHES
Furnaces are equipped with over
temperature switches to protect
against conditions in the control
compartment caused by inadequate
combustion air supply. In the event of
an overtemperature condition, the
switch will shut the furnace down. The
switch for the DOWNFLOW FURNACE
is located just above the burners on
the blower divider panel. Switches for
the UPFLOW/ HORIZONTAL
FURNACES are located on either side
of the burner brackets and just above
the burners on the center panel. If a
switch is tripped, it must be manually
reset. DO NOT jumper this switch. If
this switch should trip, a qualified
installer, service agency or the gas
supplier should be called to check
and/or correct for adequate combustion
air supply. If this unit is mounted in a
closet, the door must be closed when
making this check.
A failed inducer motor would be a
cause of inadequate combustion air.
DO NOT reset the flame roll-out switch
without taking corrective action to
assure that an adequate supply of
combustion air is maintained under all
conditions of operation. Replace this
switch only with the identical
replacement part.
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,
failedinducer 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.
FIGURE 22
DOWNFLOW BLOWER REMOVAL