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507295-02C Page 11 of 13mrcool.com
Blower OFF Delay – Heating
• The circulating air blower “OFF” delay is 120 seconds
after shutting down the burners. This delay is not
adjustable.
• The circulating air blower “ON” delay is 120 seconds
after “W” signal is received to allow the furnace to
warm up.
Safety Controls
The control circuit includes the following safety controls:
Limit Control
This control is located inside the heating compartment
and is designed to open at abnormally high circulating
air temperatures. It resets automatically. The limit control
operates when a high temperature condition, caused by
Pressure Switch
If the combustion air blower should fail, the pressure
switch prevents the spark electrode and gas valve from
being energized.
Flame Sensor
If the ignition control does not receive a signal from the
ignition period.
Rollout Switch
The switch is located on the top of the burner box. In the
event of a sustained main burner rollout, the rollout switch
shuts off the ignition control and closes the main gas valve.
To reset, push the button on top of the switch.
Secure Owner’s Approval
When the system is functioning properly, secure the owner’s
approval. Show the owner the location of all disconnect
switches and the thermostat. Instruct the owner on how
to start and stop the unit and how to adjust temperature
settings within the limitations of the system.
Maintenance
Periodic inspection and maintenance normally consists of
coil. On occasion, other components of the furnace may
also require cleaning.
Shut off all electrical power to the unit before conducting
any maintenance procedures. Failure to do so could
cause personal injury.
WARNING
Filters
Filters are not supplied with the unit. Inspect once a month.
Replace disposable or clean permanent type as necessary.
Do not replace permanent type with disposable.
Motors
Indoor and outdoor fan and vent motors are permanently
lubricated and require no maintenance.
Indoor fans are equipped with a permanent magnet
constant torque motor. These motors remain energized and
are controlled by 24V signals. For high static applications,
use Tap 3 for cooling speed and Tap 5 for heating speed.
Outdoor Coil
Dirt and debris should not be allowed to accumulate on
the outdoor coil surface or other parts in the air circuit.
Cleaning should be as often as necessary to keep coil
clean. Use a brush, vacuum cleaner attachment, or other
suitable means. If water is used to clean the coil, be sure
the power to unit is shut off prior to cleaning. Care should
not damaged.
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures or shrubs.
Burners
section. Vacuum and/or brush as required.
Vent Outlet
Visually inspect vent outlet periodically to make sure that
there is no buildup of soot or dirt. If necessary, clean to
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