IV. TO TURN THE UNIT ON AND OFF
To turn the unit on, press the orange ON/OFF button (See
Fig. 18). Unit will start. To stop unit operation, press the ON/
OFF button again. Unit will stop. Refer to Owner’s Manual
enclosed with the fan coil unit for full remote control operat-
ing details.
V. ADJUSTING AIRFLOW
The airflow direction may be adjusted up and down using the
remote controller, and from side to side by manually moving
the vents. For cooling only units and heat pump units when
in the cooling mode, set the louvers to discharge straight out
(parallel to the floor) (see Fig. 19). For the heat pump units
operating in heating mode, it is recommended that the air
discharge louvers be set to discharge vertically (see Fig. 19).
The swing range shown in Fig. 19 is the range in which will
provide maximum occupant comfort in each mode. It is rec-
ommended that the louvers be positioned within this range
(using the remote controller).
NOTE:
The full swing range of the mode selected will auto-
matically be used if auto. fan mode is selected.
VI. OPERATING MODE MEMORY
After the system is turned off or after a power failure, the
system remains in the last operating mode selected. When
the system is turned back on, or when power is automati-
cally restored, operation continues in the same operating mode
as when power shut down.
VII. AUTOMATIC OPERATION (AUTO) MODE
If auto mode is selected, the system automatically switches
the operating mode from heating (heat pump system only) to
cooling, or from cooling to heating (heat pump system only)
depending on the selected temperature.
NOTE:
Between the cooling cycle and the heating cycle there
is a neutral zone of approximately 2° F above and 2° F below
the selected temperature when only the fan is operating.
VIII. OPERATING FAULT DIAGNOSIS
The system includes an automatic diagnosis feature which is
activated under difficult or unacceptable operating condi-
tions. If such conditions occur, the system stops automati-
cally, the operating fault signal appears (green ‘‘UNIT ON’’
light on the front of the fan coil unit flashes), and an analysis
of the system operating conditions is initiated. The system
will then be restarted automatically, as soon as normal con-
ditions have been restored, or it will remain off. If the system
does not start again, the green ‘‘UNIT ON’’ light will flash an
error code.
IX. MICROPROCESSOR CONTROL OPERATION
This system is controlled by a microprocessor designed to give
optimum levels of comfort and operating efficiency. The con-
trol is located in the 619E unit. To operate the unit, the factory-
supplied remote controller is required.
There are 9 (619E cooling-only systems) or 11 (619E heat pump
systems) operating modes (including the off mode) for the unit.
Each mode operates as follows:
• Off Mode — When the unit is in the off mode, all functions
(compressor, outdoor fan, indoor fan, and air sweep) are
off, except the reversing valve (619E heat pump units only),
which will stay energized if the unit was last operated in
the cooling mode.
• Air Circulation Mode (Fan Operation Only) — When air
circulation mode is selected, the indoor fan will operate con-
tinuously in the selected speed (high, medium, low, or auto.).
If the auto. mode is selected, the indoor fan will operate at
low speed. The compressor and outdoor fan are off. The re-
versing valve (619E heat pump units only) will remain in
the last operating mode.
• Cooling Mode — When the cooling mode is selected, the
indoor fan will operate continuously at the selected speed
if the speed is high, medium, or low. If the indoor fan is in
auto. mode, the fan will change operating speeds depend-
ing on the difference between the room temperature and
the set point. The reversing valve (619E heat pump units
only) will be on. The compressor cannot run for 3 minutes
from the time the system starts up or for 3 minutes from
the time the compressor last operated. When the tempera-
ture of the room is equal to or greater than the selected
temperature, the compressor and outdoor fan will operate
until the room temperature is 2° F below the set point, and
then shut off. When the room temperature is less than the
selected temperature, the compressor and outdoor fan re-
main off.
• Maximum Dehumidification Mode —When the dehumidi-
fication mode is selected, the indoor fan will operate con-
tinuously at the selected speed if the speed is high, me-
dium, or low. If the indoor fan is in auto. mode, the fan will
Fig. 18 — Remote Controller
*Potential range.
†Desireable range.
NOTE: Unit is equipped with manual air vents which direct the air from
side to side. Up and down louver motion can be selected using the re-
mote controller. For maximum comfort, set louvers within the swing range.
See Adjusting Airflow section on this page for more information.
Fig. 19 — Louver Adjustments
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