3. SYSTEM TYPE - Select system type HP-COMFORT (for
heat pump system) or AC (for air conditioner system).
4. AC/HP CFM ADJUST - Select LO.
5. ON/OFF DELAY - Select ENH profile.
6. CONTINUOUS FAN - Select desired fan speed when ther-
mostat is set to continuous fan.
7. If the fan coil is installed with Intelligent Heat Staging capable
electric heaters, remove jumper J2. (See Fig. 17.)
NOTE:
If configuring to run warmer heating, do not remove
jumper J2 when using 5-, 8-, or 10-kw heaters.
8. Remove jumper J1 to activate dehumidify modes.
9. Wire low voltage connections as shown in Fig. 9, 10, 11, or
12.
10. Configure Thermidistat (or other Super Dehumidify/Super
Comfort Heat capable indoor control) following its installation
instructions for Super Dehumidify and Super Comfort Heat
operation.
This configuration provides the following comfort enhancements:
a. A 30 second blower on delay with 150 seconds at 70
percent airflow to allow the indoor coil to warm up or cool
down before the blower is asked to deliver 100 percent
airflow reducing the cold blow sensation at start up in
heating and allowing the indoor coil to more quickly reach
wet coil operating conditions in cooling.
b. No blower off delay eliminates cold blow which may be
associated with running the blower after shut down of the
compressor and avoids re-evaporation of condensed mois-
ture after cooling/dehumidifying operation.
c. Lower airflow while the compressor is running to reduce
draft effects and increase heating air temperature and
improved humidity control during cooling operation.
d. Intelligent Staging of the electric heater elements to more
closely match heating load requirements and provide more
consistent heating air temperatures.
Step 9—Accessory Installation
ACCESSORY ELECTRIC HEATERS
Electric heaters may be installed with the 40FKA Fan Coil per
instructions supplied with electric heater package. See unit rating
plate for factory-approved electric heater kits.
NOTE:
Units installed without electric heat should have a field-
supplied sheet metal block-off plate covering the heater opening.
This reduces air leakage and formation of exterior condensation.
AUXILIARY TERMINALS
The AUX and HUM terminals on the Easy Select Board are tied
directly to the G terminal, and provide a 24-vac signal whenever
the G terminal is energized. (See Fig. 17 and 19.) During Perfect
Heat Plus/Super Comfort Heat and Superdehumidify modes, the G
signal is not present and the auxiliary terminals are not energized.
If the installation includes the use of one of these operating modes,
do not use these terminals to control accessories. See Electronic
Air Cleaner and Humidifier sections for further information.
ELECTRONIC AIR CLEANER CONNECTIONS
The AUX1 and AUX2 terminals are not always energized during
blower operation, as described above. When using an electronic air
cleaner with the 40FKA Fan Coil, use Airflow Sensor Part No.
KEAAC0101AAA. The airflow sensor turns on electronic air
cleaner when the fan coil blower is operating.
HUMIDIFIER CONNECTIONS
The HUM1 and HUM2 terminals are not always energized during
blower operation, as described under Auxiliary Terminals Section.
To ensure humidifier will operate properly during Super Comfort
Heat mode, use HUM output of Thermidistat Control or Comfort
Zone II to control humidifier operation. Alternatively, the 24-vac
signal can be sourced from the W and C terminal block connec-
tions when electric heaters are used as the primary heating source,
or if another humidistat is desired to control the humidifier. (See
Fig. 9, 10, 11, and 12.)
Step 10—40FKA Fan Coil Sequence Of Operation
The 40FKA will supply airflow in a range which is more than
twice the range of a standard fan coil. It is designed to provide
nominal cooling capacities at a 50°F evaporator temperature and
the required airflow which enables it to match with 4 air condi-
tioner or heat pump system sizes. Table 6 outlines the CFM range
for the different 40FKA Fan Coil sizes.
CONTINUOUS FAN
•
Thermostat closes circuit R to G.
•
The blower runs at continuous fan airflow.
COOLING MODE - SINGLE SPEED OR 2-SPEED HIGH
•
If indoor temperature is above temperature set point and
humidity is below humidity set point, thermostat closes circuits
R to G, R to Y/Y2 and R to O.
The fan coil delivers single speed cooling airflow.
•
Thermostat closes circuits R to G, R to Y1, R to Y2 and R to
O.
The fan coil delivers 2-speed high cooling airflow.
COOLING MODE - 2-SPEED LOW
•
Thermostat closes circuits R to G, R to Y1 and R to O.
The fan coil delivers 2?speed low cooling airflow.
COOLING MODE - DEHUMIDIFICATION
•
If indoor temperature is above temperature set point and
humidity is above humidity set point, thermostat or Thermidis-
tat™ closes circuits R to G, R to O, and R to Y/Y2, and
humidistat or Thermidistat opens R to DH.
•
The fan coil delivers airflow which is approximately 80 percent
of the nominal cooling airflow to increase the latent capacity of
the system.
COOLING MODE - SUPERDEHUMIDIFY OPERATION
NOTE:
The indoor control used, such as Thermidistat, must be
capable of providing Super Dehumidify operation mode and
control must be configured as outlined in its installation instruc-
tions. Consult indoor control literature to determine if control is
capable of providing Super Dehumidify inputs and for configura-
tion instructions.
If the indoor temperature is below the temperature set point and the
humidity is above the humidity set point, the Thermidistat closes
circuit R to O, opens circuits R to DH and R to G, and cycles
circuit R to Y/Y2 (for single speed system R to Y1, or R to Y1 and
Y/Y2 for 2-speed system).
The ICM2 motor reads the G signal to the fan coil while the heat
pump is operating, (circuit R to Y/Y2 for single speed system, R
to Y1 or R to Y1 and Y/Y2 for 2-speed system), closed (24 vac).
If circuit R to G is closed (24 vac), the motor will deliver airflow
at the full cooling or cooling plus dehumidify mode requested
Table 6—CFM Range for 40FKA Units
FAN COIL SIZE
SYSTEM SIZES
CFM RANGE
40FKANF002
018, 024, 030, 036
450-1275
40FKANF003
024, 030, 036, 042
525-1475
40FKANF005
030 ,036, 042, 048
550-1700
40FKANB006
036, 042, 048, 060
550-2150
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