D3
5-21-07
FAN COIL UNIT CONTROLS
automatically adjusts the speed and torque in response to
system pressure changes and pressure independent constant
airflow operation is achieved without the need for an external
flow sensor feedback loop. Engineered Comfort fan coil units
incorporate our own custom EPIC fan controller, an electronic
PWM volume control device that allows adjustment of airflow
volume. Minimum and Maximum airflow can be pre-set at the
factory. It is field adjustable either manually using a
screwdriver and voltmeter locally at the fan coil or with the
Engineered Comfort
thermostat and controller or remotely
using a 0 – 10 VDC analog output from a digital controller via
the BAS. A fan volume versus DC volts calibration chart is
provided. The importance of this feature is the energy that is
saved due to controlling the fan airflow as well as the large
reduction in noise generation. This also removes the
uncertainty of diffuser flow measurement with hoods.
Laboratory tests show the fan cfm to be accurate within +/- 5%
of the factory set point. This is a huge benefit to the owner, the
occupant, the controls contractor, and the mechanical
contractor.
ENERGY SAVINGS
The following graphs show the energy savings of units with
EPIC Fan Technology
®
compared to units with PSC motors.
The Engineered Comfort airflows are shown at relatively lower
set points (81%) due to a lower discharge air temperature
(See control sequence for further explanation).
WHAT IS THE PAYBACK PERIOD WITH EPIC FAN
TECHNOLOGY
®
?
The payback period varies. It depends on which unit you use,
where you set the airflow, how much you run the equipment
and what you are paying for electricity. The charts below are
calculated assuming 24/7 operation of the Nailor unit vs. 80%
run time on a competitive unit and $ 0.10 per kWh. If you run
the equipment longer in your building or if you pay more for
electricity, the payback will change proportionally. The charts
consider only operating costs of the fan, other savings at the
chiller and at the higher room set points can double the
savings cutting the payback in half. On tall buildings, reduced
riser sizes may offset the fan costs at the time of construction.
Typically, you can run anywhere from 3 to 11 Engineered
Comfort units for the same price as one of the competitions
making the payback period as short as 6 months to as long as
36 months.
HIGH SPEED COST TO RUN COST TO RUN NO. OF ENGINEERED COMFORT
AIR FLOW AC INDUCTION ENGINEERED UNITS THAT CAN BE
(CFM) FAN 1 YEAR COMFORT RUN FOR THE COST OF
FAN 1 YEAR ONE COMPETITOR’S UNIT
350 $79.19 $15.77 5.02
400 $84.32 $17.04 4.95
600 $161.32 $21.81 7.40
800 $188.52 $16.51 11.42
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