J801X Installation Manual

21
OPERATING SEQUENCE
The operating sequences for the heating, cooling, and fan
modes are described below. Refer to the field and furnace
wiring diagrams:Figure 14, (page 18), Figure 15, (page
18) and Figure 19, (page 24) and Figure 20, (page 25).
Heating Cycle
1. The thermostat calls for heat by energizing the W terminal
with 24VAC.
2. The control verifies the pressure switch is open.
3. If the pressure switch is open, the control energizes the
inducer and waits for the pressure switch to close. The
pressure switch must close within 10 seconds.
4. The control runs the inducer for a 30 second pre-purge.
5. The control energizes the igniter output for the appropriate
warm-up time limit.
6. The control energizes the main gas valve for 3 seconds.
7. If the flame proved and ignites the gas, the control de-
energizes the igniter. The gas valve and inducer remains
energized. The control goes to blower on delay.
8. If flame is present, the control energizes the blower on
the selected HEAT speed 30 seconds after the gas valve
opened. The gas valve and inducer remain energized.
9. When the thermostat demand for heat is satisfied, the
control de-energizes the gas valve. The inducer output
remains on for a 30 second post-purge period.
10. Blower off timing begins when the thermostat is satisfied.
The control will operate at the selected HEAT speed of 60,
90, 120, or 180 seconds. If the blower off delay jumper is
not present, the fan should still operate for 120 seconds
at the selected HEAT speed. The Indoor blower motor
is de-energized after a blower off delay as selected by
the movable jumper.
Cooling Cycle
1. The thermostat calls for cooling by energizing the Y terminal
with 24VAC.
2. The control energizes the blower in the cooling speed and
sends 24VAC to the contactor in the condensing unit.
3. When the thermostat removes the call for cooling, the
contactor in the outdoor condensing unit is de-energized
and the control continues to run the fan for a period of 60
seconds.
Fan Mode
• When the thermostat energizes the G terminal for
continuous fan (without calling for heat or cooling), the
indoor fan is energized on the selected FAN speed. See
Figure 15, (page 18).
• If a call for cooling occurs during continuous fan, the blower
will switch over to the selected COOL speed.
• If the W terminal receives a call for heat during continuous
fan, the blower will de energize.
• A call for fan is ignored while in lockout.
MAINTENANCE
WARNING:
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury, death or property
damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical
power to furnace.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
Proper maintenance is most important to achieve the best
performance from a furnace. Follow these instructions for
years of safe, trouble free operation.
• These maintenance instructions are primarily intended
to assist qualified technicians experienced in the proper
maintenance and operation of this appliance.
• Always reinstall the doors on the furnace after servicing or
cleaning/changing the filters. Do not operate the furnace
without all doors and covers in place.
• Verify the thermostat is properly installed and is not being
affected by drafts or heat from lamps or other appliances.
• To achieve the best performance and minimize equipment
failure it is recommended that a yearly maintenance
checkup be performed. At a minimum, this check should
include the following items:
Air Filter - An air filter is not supplied with the furnace as
shipped from the factory. The installer must provide a high
velocity filter that is appropriately sized to the return air duct
opening or external filter rack.
WARNING:
Never operate the furnace without a filter in place.
Dust and lint can build up on internal components,
resulting in loss of efficiency, equipment damage,
and possible fire.
It is recommended that filter(s) be 1” or 2” thick and be cleaned
or replaced monthly. New or newly renovated homes may
require more frequent changing until the construction dust
has minimized.
Filters designed to remove smaller particles such as pollen,
may require additional maintenance. Filters for side return
and bottom return applications are available from most local
distributors.
Blower Compartment - Dirt and lint can create excessive
loads on the motor resulting in higher than normal operating
temperatures and shortened service life. It is recommended
that the blower compartment be cleaned of dirt or lint that