OPTION 4—FAN (G) ON WITH W
This selection determines whether fan (G) output is to be ON or
OFF when any W (furnace or strip heat) output is ON. Most
furnaces and fan coils manage their own blowers and do not
require separate G signal. For these applications, select OFF. Some
auxiliary heaters require separate G signal to turn on blower. In
this case, select ON. Factory default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4
"To Enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 04.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
OPTION 5—VARIABLE SPEED (ICM) BLOWER
If furnace or fan coil contains a variable-speed (ICM) blower, set
this option to ON. For normal (PSC) blowers, set to OF. This
selection enables system to use special features available only in
units with an ICM blower. Factory default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4
"To Enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 05.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
OPTION 6—COOLING LOCKOUT BELOW 55°F
This option disables cooling when outdoor temperature is below
55°F. It requires an outdoor temperature sensor. Set to OF to allow
cooling below 55°F. Set to ON to prevent cooling below 55°F.
Factory default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4
"To Enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 06.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
OPTION 7—VARIABLE SPEED SUPERDEHUMIDIFY
This option requires prior selection of variable-speed (ICM)
blower (Option 5). When selected, this option operates blower at
further reduced airflow from that of normal dehumidification when
there is a dehumidification demand without a cooling demand,
achieving maximum humidity removal with minimum cooling. It
is done by supplying blower with a Y signal and no G signal on a
call for cooling. Not all products with ICM blowers have this
feature. Check Installation Instructions for ICM air handler used.
Select OF for normal operation (Y and G supplied on a cooling
call). Select ON for super dehumidification (Y with no G on a
dehumidify only call). Factory default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4
"To Enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 07.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
OPTION 8—AUXILIARY HEAT LOCKOUT TEMPERATURE
This option requires prior selection of heat pump (DIP switch 1
ON). It allows selection of an outdoor temperature of OF, 5, 10,
15, 20, 25, 30, 35, 40, 45, 50, or 55°F. Outdoor temperature sensor
MUST be attached. If temperature is selected and outdoor tem-
perature sensor is not attached, error message E3 will appear. See
"Error Codes." In heat pump systems, auxiliary heat is prevented
from operating for outdoor temperatures above selected tempera-
ture. In dual fuel systems, furnace is prevented from operating for
outdoor temperatures above selected temperature. However, heat
pump or furnace may be used during defrost. See Configuration
Option No. 12. If OF is selected, outdoor temperature does not
affect system operation. Factory default is OF (off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4
"To Enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 08.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to move between OF, 5, 10, 15, 20,
25, 30, 35, 40, 45, 50, or 55 on large display. Factory
default is OF.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
OPTION 9—SPECIAL 3-STAGE ELECTRIC HEAT
This option requires prior selection of single-speed heat pump
(DIP switch 1—ON, DIP switch 2—OF). It provides 3 stages of
electric heat from W1 and W2 by sequencing W1 only, then W2
only, then both W1 and W2. See FK Series Fan Coil Installation
Instructions for further information. For 3-stage heat, select ON.
For normal 1- or 2-stage heat, select OF. Factory default is OF
(off).
TO SELECT:
1. Enter configuration mode if not already there. See Step 4
"To Enter Configuration Mode." Use up and down buttons
to make small (now flashing) display indicate 09.
2. Press SET TIME/TEMP button once to flash large display.
3. Use up or down buttons to alternate between OF and ON on
large display. Factory default is OF.
4. Press SET TIME/TEMP button again to flash upper small
display for selection of another option, or press END to exit
configuration mode.
OPTION 10—DUAL FUEL EQUIPMENT
CAUTION:
All dual fuel installations must be equipped
with a high pressure switch to turn off compressor under
a high indoor coil pressure condition.
The high pressure switch protects compressor and indoor coil from
overpressure which would occur if a failure or wiring error
resulted in the heat pump and furnace operating at the same time.
—4—
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