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IF THE SECONDARY LIMIT CONTROL SHOULD OPEN, THE REASON MUST BE
DETERMINED BEFORE THE CONTROL RESETS. THE ELECTRICAL POWER
MUST BE DISCONNECTED BEFORE ANY PANEL IS REMOVED OR MAIN-
TENANCE IS PERFORMED.
SECONDARY LIMIT
The secondary limit control is located on the blower housing and
monitors blower compartment temperatures. It is a normally closed
(electrically), automatic reset, temperature activated sensor. This limit
guards against overheating as a result of insufficient conditioned air
passing over the heat exchanger. It deenergizes the gas valve if the
blower fails.
NOTE: If the power to the unit is interrupted during the heating cycle,
it may cause the secondary limit to trip. Once the blower compartment
temperature drops below the limit reset temperature, the limit will
automatically reset.
ROLLOUT LIMIT
T H E CAUSE OF THE ROLLOUT PROTECTION DEVICE OPENING MUST BE INVEST-
IGATED BY A QUALIFIED SERVICER BEFORE ANY ATTEMPT IS MADE TO RESET
THE ROLLOUT PROTECTION DEVICE AND TURN THE UNIT BACK ON. THE
ELECTRICAL POWER MUST BE DISCONNECTED BEFORE EITHER FRONT PANEL
IS REMOVED.
The rollout limit is a normally-closed (electrically), manual-reset,
temperature-activated sensor. It is mounted on the burner bracket and
monitors the burner flame. If there is an improper draw of burner
flames into the heat exchanger, the rollout limit will detect it and shut
off gas flowing to the burners. Contact a qualified servicer to check the
unit before resetting this device.
Rollout Protection on Burner Bracket
COMPRESSOR PROTECTION DEVICES
This gas/electric package unit includes components which are
designed to protect the compressor against abnormal operating
conditions.
TO PREVENT PERSONAL INJURY OR DEATH, ALWAYS DISCONNECT THE
ELECTRICAL POWER BEFORE INSPECTING OR SERVICING THE UNIT. SlNCE
A L L OF THE COMPRESSOR PROTECTION DEVICES RESET AUTOMATICALLY.
THE CONTACTOR AND OUTDOOR FAN MAY BE ENERGIZED WHEN RESET.
NOTE: The operation of the indoor blower will not be affected by any
compressor protection devices.
If, during a call for cooling, the indoor fan runs and circulates room
temperature air while the compressor and outdoor fan do not
operate:
1. Wait five minutes, as a protection device may be holding the com-
pressor off.
2. Check the room thermostat to see if it is correctly set.
3. If the room thermostat is correctly set, call a qualified servicer to
determine if one of the compressor protection devices has opened.
SHORT-CYCLE PROTECTOR
A short-cycle protector is built into the ignition control. Each time the
compressor is off for less than 3 minutes, the short-cycle protector
will delay compressor startup for up to 3 minutes. This protects the
compressor from improper operation.
NOTE: These units are not designed to provide mechanical cooling
at outdoor temperatures below 50°F. If low ambient cooling is
needed, consult a qualified servicer.
IGNITER
The unit has an electronic ignition device which lights the burners
automatically. Never try to light the burners by hand. It also has an
induced draft blower to exhaust combustion products.
INDOOR AIR CIRCULATOR BLOWER
Keep the blower access door panel in place except for inspection and
maintenance.
ROUTINE MAINTENANCE
If you perform maintenance on the unit yourself, remember that
certain mechanical and electrical knowledge, skills and tools are
required to perform unit maintenance. Personal injury or death may
result If you are not properly trained. You should call your installing
dealer or place of purchase if you are uncertain about your ability to
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