5873914-UUM-B-0820
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Johnson Controls Ducted Systems
• Do not use the furnace if any part of the furnace has been under
water. A flood-damaged furnace is extremely dangerous.
Attempts to use the furnace can result in fire or an explosion.
Contact a qualified service agency to inspect the furnace and to
replace all gas controls, control system parts, and electrical parts
that have been wet or to replace the furnace if necessary.
• Before each heating season, inspect the flue gas vent and the
return and supply air duct, and make sure that the equipment is
well supported and there are no signs of deterioration. The manu-
facturer recommends that the main burner, ignition device, and
controls are inspected by a qualified furnace technician before
each heating season.
• This heating/cooling unit is designed for outdoor use. Install the
unit anywhere from grade level to the roof. The unit provides elec-
tric air conditioning in the summer and gas heating in the winter.
• Do not allow snow to accumulate near the furnace where it could
block the flue gas vent or the combustion air intake.
SYSTEM OPERATION
THERMOSTAT
To set your thermostat for heating or cooling:
1. Set the comfort control switch on the thermostat to the HEAT or
COOL position
2. Set the thermostat to the required temperature.
Note:
Do not turn on the thermostat and turn off the thermostat or
switch between heating and cooling modes in rapid succession. This
could damage your equipment.
Always allow at least 5 min between changes to thermostat settings.
Find the temperature that is most comfortable for you, and refrain from
adjusting your thermostat unnecessarily. You can adjust the thermostat
for nighttime or periods when you are on vacation to conserve energy.
Be aware of the following:
• Manually increasing or decreasing the temperature setting on the
thermostat does not speed up temperature changes in your
home. This only causes the thermostat switch to function at your
command rather than responding to room temperature.
• Heat generated by devices other than the furnace can interfere
with thermostat performance, so do not place items such as
lamps, radios, and television sets near the thermostat.
SPARK IGNITION DEVICE
The unit is equipped with a spark ignition device. The control is
designed to automatically light the burner each time the thermostat calls
for heat.
HEATING
For heating operation, set the comfort control switch on the thermostat
to the HEAT position and set the thermostat to the required tempera-
ture. When the indoor temperature drops below the selected tempera-
ture on the thermostat, the system starts. The heating system operates
and the indoor circulating fan circulates the filtered air. When the room
temperature rises to the selected temperature on the thermostat, the
system shuts off.
See the INDOOR CIRCULATING FAN section for more information
about fan operation.
COOLING
For cooling operation, set the comfort control switch on the thermostat
to the COOL position and set the thermostat to the required tempera-
ture.
When the thermostat calls for cooling, the thermostat signals the com-
pressor and outdoor fan to run. The indoor circulating fan is immediately
energized at cooling speed.
When the thermostat demand is satisfied, the compressor and outdoor
fan are de-energized. The indoor circulating fan is de-energized after a
cool fan off delay time of 30 s.
See the INDOOR CIRCULATING FAN section for more information
about fan operation.
INDOOR CIRCULATING FAN
For indoor fan operation, you can set the fan switch on the thermostat
as follows:
• ON: If you set the fan switch to the ON position, the indoor circu-
lating fan operates continuously, regardless of whether heating or
cooling operation is in progress. The fan does not shut off when
there is no heating or cooling operation.
• AUTO: If you set the fan switch to the AUTO position, the indoor
circulating fan operates only during heating or cooling operation.
The fan shuts off when there is no heating or cooling operation.
When the thermostat calls for fan operation, the thermostat terminal sig-
nals the indoor circulating fan to run at the selected fan speed. If a call
for cooling occurs, the indoor circulating fan switches to the cool speed.
If a call for heat occurs, the indoor circulating fan switches to the heat
speed after a 30-s delay.
When the thermostat ends the call for fan operation, the indoor circulat-
ing fan is de-energized.
INPUT
The correct heat capacity of the furnace is regulated by the burner ori-
fices and the gas pressure. The proper orifices are provided but the
installing service technician or gas company must adjust the gas pres-
sure regulator. This is a one-time adjustment.
CAUTION
Do not attempt to manually light the burners. Personal injury could
result.
WARNING
Should overheating occur, shut off the manual gas valve external to
the appliance before shutting off the electrical supply.
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WARNING
The flue hood surface and the immediate area surrounding it are
designed to operate at high temperatures during the heating cycle.
Take special care to prevent human contact with this area and keep
debris away from this area.
WARNING
Incorrect installation of the flue vent hood could cause personal injury
or property damage.
Figure 1:
Exhaust and Air Intake Hoods
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AIR INTAKE HOOD
AIR INTAKE SCREEN
EXHAUST HOOD
A1391-001
