11
heater operation. The factory selection is the largest heater range
approved. (See Fig. 17, A as indicated.)
B. AC/HP SIZE -- Select system size installed
The factory setting for air conditioner or heat pump size is the
largest unit meant for application with the model of fan coil
purchased. Installer needs to select air conditioner or heat pump
size to ensure that airflow delivered falls within proper range for
the size unit installed. This applies to all operational modes with
the exception of electric heat modes. (See Fig. 17, B as indicated.)
C. SYSTEM TYPE -- Select system type installed AC or HP
The type of system must be selected:
1. AC -- Air conditioner
2. HP--COMFORT -- Heat Pump Comfort provides approxim-
ately 315 CFM per ton for higher normal heating air deliv-
ery temperature. Provides approximately 350 CFM per ton
cooling airflow for good humidity removal.
3. HP--EFF -- Heat Pump Efficiency provides same airflow for
heating and cooling modes to increase overall HP effi-
ciency; approximately 350 CFM per ton. The factory setting
is AC. (See Fig. 17, C as indicated.)
D. AC/HP CFM ADJUST -- Select Medium, Low, or High
Airflow
To provide airflow at rates described above, the AC/HP ADJUST
select is factory set to the nominal (nom) tap. The adjust selections
HI/LO will regulate airflow supplied for all operational modes,
except non--heat pump heating modes. HI provides 15% airflow
over nominal unit size selected and LO provides 10% airflow
below nominal unit size selected. Adjust selection options are
provided to adjust airflow supplied to meet individual installation
needs for such things as noise, comfort, and humidity removal.
(See Fig. 17, D as indicated.)
E. ON/OFF DELAY -- Select desired time delay profile
NOTE
: Delay selections are active in cooling and heat pump
heating modes only. Auxiliary heating modes have a 1 minute off
delay and zero on delay programmed into the ECM motor that
cannot be overridden.
Four motor operation delay profiles are provided to customize and
enhance system operation. (See Fig. 17, E as indicated)
Selection options are:
1. The standard 90 sec off delay (Factory setting) at 100% air-
flow.
2. No delay option used for servicing unit or when a thermo-
stat is utilized to perform delay functions.
3. A 30 sec on delay with no airflow/90 sec off delay at 100%
airflow profile is used when it is desirable to allow system
coils time to heat--up/cool--down in conjunction with the
airflow.
4. ENH, enhanced selection, provides a 30 sec on delay with
no airflow/ plus 150 sec at 70% airflow/ no off delay for
added comfort. This profile will minimize cold blow in heat
pump operation and could enhance system efficiency.
F. CONTINUOUS FAN -- Select desired fan speed when ther-
mostat is set on continuous fan
NOTE
: If installed with a 2--speed outdoor unit, do not select HI
speed continuous fan. If HI is selected, low speed compression will
also
run
HI
speed
possibly
resulting
in
insufficient
dehumidification.
1. LO speed -- factory setting, 50% cooling mode airflow.
2. MED speed -- move connector to MED, 80% cooling mode
airflow.
3. HI speed -- move connector of HI, 100% cooling mode air-
flow. (See Fig. 17, F as indicated.)
G. Low--Voltage Circuit Fusing and Reference
The low--voltage circuit is fused by a board--mounted 5--amp
automotive fuse placed in series with the transformer SEC2 and the
R circuit. The C circuit of the transformer is referenced to chassis
ground through a printed circuit run at SEC1 connected to metal
standoff marked with ground symbol.
H. Basic Fan Coil Configuration
The following basic configuration of the fan coil will provide ARI
rated performance of the heat pump:
1. AUX HEAT KW/CFM -- Select the heater range for the
size electric heater installed.
2. AC/HP SIZE -- Select system size installed.
3. SYSTEM TYPE -- Select system type HP--EFF.
4. AC/HP CFM ADJUST -- Select NOM.
5. ON/OFF DELAY -- Select 0/90 profile.
6. CONTINUOUS FAN -- Select desired fan speed when ther-
mostat is set to continuous fan.
I. COMFORT OPTIONS -- WARMER HEATING AND
SUPER DEHUMIDIFY (See Fig. 21 for Quick Reference
Guide)
The FV4C Fan Coil provides better than average humidity control
and heated air temperature. This configuration will improve the
comfort provided by the heat pump system if more humidity
removal or if warmer heating air is desired. While providing this
improved comfort, the heat pump system will operate efficiently,
but not at the published HSPF or ARI SEER efficiency.
The following fan coil configuration is recommended for
maximum heating and cooling/dehumidifying comfort: (See Fig.
17.)
1. AUX HEAT KW/CFM -- Select narrowest heater range to
match size of electric heater installed (skip this step if no
heater is installed).
2. AC/HP SIZE -- Select system size installed.
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 cap-
able 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 capable zoning system) follow-
ing
its
installation
instructions
for
enhanced
dehumidification and SuperComfort/Perfect Heat operation.
This configuration provides the following comfort enhancements:
a. A 30 second blower on delay with 150 seconds at 70% air-
flow to allow the indoor coil to warm up or cool down be-
fore the blower is asked to deliver 100% 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 as-
sociated 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 im-
proved humidity control during cooling operation.
FV4
C