24
X. Maintenance
WARNING
To prevent death or personal injury due to
electric shock, disconnect electrical power
before performing any maintenance.
ANNUAL INSPECTION
The furnace should be inspected by a qualified installer, or
service agency at least once per year. This check should be
performed at the beginning of the heating season. This will
ensure that all furnace components are in proper working
order and that the heating system functions appropriately.
Pay particular attention to the following items. Repair or
service as necessary.
Have vent pipe checked to be sure it is not blocked by debris
which could permit fumes to enter the house. Replace any
rusted or leaking sections of vent pipe.
IMPORTANT NOTE:
Handle the igniter with care. Touch-
ing the igniter body with bare fingers, rough handling, or
vibration could result in early igniter failure. Only a qualified
servicer should ever handle the igniter.
AIR FILTER
WARNING
To prevent death, personal injury or
property damage due to fire, never operate
furnace without a filter installed. Dust and
lint will build up on internal parts resulting
in loss of efficiency, equipment damage
and possible fire.
A return air filter is not supplied with this furnace; however,
there must be a means of filtering all of the return air. The
installer will supply filter(s) at the time of installation.
Filters should be inspected, cleaned or changed every two
months or as required. It is the owners personal responsi-
bility to keep air filters clean. Remember - dirty filters are the
most common cause of inadequate heating or cooling
performance.
WARNING
To prevent death, personal injury or
property damage due to electrical shock,
disconnect electrical power to furnace
before removing filter or performing any
other maintenance.
Become familiar with filter location and procedures for
removal, cleaning and replacing them. If help is needed,
contact the installer of the furnace or a qualified servicer.
High Limit Control
Figure 36
High Limit Control
HIGH LIMIT CONTROL CHECK
WARNING
To prevent death, personal injury, property
damage or premature failure of heat
exchanger, do not adjust the limit control
(factory preset).
Check limit control operation after 15 minutes of operation
by blocking the return air grille(s).
1. After several minutes the burners must go OFF. Air
circulation blower will continue to run.
2. Remove air restrictions and burners will relight after a
cool down period of a few minutes.
Adjust the thermostat setting below room temperature
1. Burners must go off.
2. Air circulation blower will continue to run a total of 60,
90, 120 or 180 seconds as set.
IMPORTANT NOTE:
This unit must not be used as a
construction heater during the finishing phases of construc-
tion of a new structure. This type of use may result in
premature failure due to extremely low return air tempera-
tures and exposure to corrosive or very dirty atmospheres.
FURNACE SHUTDOWN
1. Set the thermostat to lowest setting.
2. Turn off the electrical power supply to the furnace.
3. Turn the gas control knob clockwise
to the
Off position (Figure 33). The knob should turn easily.
Do not use excessive force.
4. Close manual gas shut-off valve external to the fur-
nace.
5. Replace the door on the unit.
