Fan Coils
INSTALLATION, OPERATION, & MAINTENANCE MANUAL
11
SECTION TWO — Start Up, Cont'd.
3-Speed, Potentiometer Adjustment (Eco V 2 Only)
Potentiometer
Low, Med, High CFM adjust
The unit has been factory configured to produce PSC
equivalent airflow on high speed, with medium and low
speed set at 80% and 60% of high, respectively. If these
setting are acceptable, then no further configuring is
required.
If alternative airflows are desired, use board mounted pots
to adjust the airflow associated with each input. Each
output can be adjusted from 0 to 100% of the motor’s
factory programmed operating range. Use voltmeter and
airflow chart (on control box cover) to set values. Refer to
Appendix A for adjustment procedure.
4-Speed, Solid State with Potentiometer
See photo in Appendix B on page 18. The unit has been
factory configured to produce PSC equivalent airflow on
high speed, with medium and low speed set at 80% and
60% of high, respectively. If these setting are acceptable,
then no further configuring is required.
Board mounted pots are provided to adjust the airflow
pertaining to each output. Each output can be adjusted
from 0 to 100% of the motor’s factory programmed
operating range. Use voltmeter and airflow chart (on
control box cover) to set values. Refer to Appendix B for
adjustment procedure.
Variable Airflow for 0-10 VDC
Flo 1, 2, & 3 Terminals
Flo 0 & 4 Terminals
Com
Pot Adjustment
Flo 1, 2, & 3
(in the Field)
Pot Adjustment
Flo 0 & 4
(Contact Factory)
If a factory provided thermostat or DDC controller is
utilized, then the unit is already correctly configured.
IEC recommends using the specified thermostat or DDC
controller to commission the unit whenever possible.
However, the blower can be started and operated without
the thermostat. To do so, locate jumper 7 near the large
capacitor. Move J7 from 0-10 to Man. Once moved, the
on-board pots control fan speed. To switch the fan in this
configuration, place a dry contact in-line on the enable wire.
Eco 2 Variable Airflow for 0-10 VDC
No control board is required and no field adjustments are
possible. Motor uses 0-10VDC signal directly. See control
box label. Fan enable at 1.5VDC.
Water Treatment
Proper water treatment is a specialized industry. IEC
recommends consulting an expert in this field to analyze
the water for compliance with the water quality parameters
listed below, and to specify the appropriate water treatment
regimen. The expert may recommend typical additives such
as rust inhibitors, scaling preventative, antimicrobial growth
agents, or algae preventatives. Anti-freeze solutions may
also be used to lower the freezing point.
IEC water coil tubes and headers are constructed of pure
copper. Multiple brass alloys may be present in the valve
