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Sequence of Operation
ELECTRO-MECHANICAL CONTROLS — A 24-v signal
from the thermostat to terminal G supplies power to the blower
motor(s), condensate pump and vane motor (if equipped). A
toggle switch on the control box can be used to switch the
oscillating vanes on or off. The condensate pump will run con-
tinuously, as long as the blower is energized. A call for heating,
at terminal W, or cooling, at terminal Y, will energize the water
valve actuator and allow water to flow through the cassette
coil. When the call for heating or cooling is satisfied, the valve
will close.
If the temperature drops below the set point of the coil
freezestat, the water valve with automatically open to circulate
water through the coil.
If the condensate float switch detects a high level of water in
the condensate tray, the switch will open, activate the conden-
sate pump and disable the heating/cooling signal until the water
level drops down to normal.
MICROPROCESSOR CONTROLS — The microprocessor
monitors indoor coil temperature and return-air temperature.
The receiver contains a self diagnostic feature. When a low in-
door coil temperature is detected, the cooling action is stopped.
If a sensor fails then an alarm is displayed on the fascia mount-
ed receiver.
OPERATION
When using the IR transmitter (see Fig. 14), always point
the transmitter head directly at the receiver. At the time of
transmission the transmit indicator symbol will display and an
audible alarm will be heard if the signal has been received.
When the batteries are first installed, the transmitter or op-
tional pendant default set point will be 64 F, low fan speed will
be selected, and the system will be set to cool only mode.
Cool Only Mode Settings
1. Press MODE button until the cool symbol is highlighted.
2. Press FAN button until the desired fan speed is
highlighted.
3. Press the TEMP + or - button until the desired tempera-
ture set point is displayed. Limits are 58 F to 90 F.
4. Press the ON/SEND button to switch the unit on and
transmit the new system settings.
Heat Only Mode Settings
1. Press MODE button until the heat symbol is highlighted.
2. Press FAN button until the desired fan speed is
highlighted.
3. Press the TEMP + or - button until the desired tempera-
ture set point is displayed. Limits are 58 F to 90 F.
4. Press the ON/SEND button to switch the unit on and
transmit the new system settings.
Auto Mode Settings
1. Press MODE button until the auto symbol is highlighted.
2. Press FAN button until the desired fan speed is
highlighted.
NOTE: In Auto mode, the fan speed will be determined
by the temperature conditions.
3. Press the TEMP + or - button until the desired tempera-
ture set point is displayed. Limits are 58 F to 90 F.
4. Press the ON/SEND button to switch the unit on and
transmit the new system settings.
Setting the Current Time
1. Press CLK/TIMER button once. CLOCK SET should
begin flashing in the time display.
2. Press either + or - button within the CLK/TIMER area,
the hours of the current time should now start to flash.
3. Use the + or - button to change the hour setting. Press
CLK/TIMER button once to enter the selected hour.
4. The minutes of the current time should now be flashing.
Again use the + or - button to change the minute setting.
Press CLK/TIMER button once to enter the selected
minutes.
5. The current weekday should now be flashing. Again use
the + or - button to change the weekday setting. Press
CLK/TIMER button once to enter the selected weekday.
6. CLOCK SET in the time display should now disappear.
The current time and weekday have now been set.
Programming the Unit —
programmed for three different settings: weekdays, Saturday,
and Sunday. Units can be programmed with up to two start/stop
periods in each setting.
SETTING THE WEEKDAYS TIME PROGRAM (Monday
through Friday)
1. Press CLK/TIMER button twice. PROGRAM should be-
gin flashing and the days Monday through Friday (MO,
TU, WE, TH, FR) will appear in the time display.
2. Press either + or - button within the CLK/TIMER area,
PROGRAM 1 should appear and START TIME should
be flashing.
3. Use the + or - button to change the hour setting of pro-
gram 1 start time. Press CLK/TIMER button once to en-
ter the selected hour.
4. The minutes of program 1 start time should now be flash-
ing. Again use the + or - button to change the minute set-
ting. Press CLK/TIMER button once to enter the selected
minutes.
5. START TIME will disappear and STOP TIME should
flash.
6. Use the + or - button to change the hour setting of pro-
gram 1 stop time. Press CLK/TIMER button once to en-
ter the selected hour.
7. The minutes of program 1 stop time should now be flash-
ing. Again use the + or - button to change the minute set-
ting. Press CLK/TIMER button once to enter the selected
minutes.
8. If program 2 is to be used, repeat Steps 3-7. If program 2
is not to be used, leave the starts and stops set to
12:00 am.
9. When the programming is complete SEND will flash in
the time display, press ON/SEND button while pointing
at receiver, to transmit the program settings. The main
unit should beep and the red indicator should be lit. A
small clock should be seen within the time display, indi-
cating a time program has been set up.
SETTING THE SATURDAY TIME PROGRAM
1. Press CLK/TIMER button three times. PROGRAM
should begin flashing and the day Saturday (SA) will ap-
pear in the time display.
2. Follow Steps 2-9 in Setting the Weekdays Time Program
above to complete Saturday programming.
SETTING THE SUNDAY TIME PROGRAM
1. Press CLK/TIMER button four times. PROGRAM
should begin flashing and the day Sunday (SU) will ap-
pear in the time display.
2. Follow Steps 2-9 in Setting the Weekdays Time Program
above to complete Sunday programming.
33
Start/stop periods can be
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