140
b. On sizes 04-06 single speed indoor fan opera-
tion provided and on 07 size model with two
stage cooling capacity control, the indoor fan
speed is automatically controlled to meet the
code-compliant 66% low fan speed and 100% at
full fan speed operation.
c. Blower fan shall be a Vane Axial fan design
with 75% less moving parts than a conventional
belt drive system.
d. Shall be constructed of a cast aluminum stator
and high impact composite material on rotor
and air inlet casing.
e. Shall be a patented / pending design with a corro-
sion resistant material and dynamically balanced.
f. Shall have slow ramp up to speed capabilities to
help reduce sound and comfort issues typically
associated with single speed belt drive systems.
g. Shall be a slide out design with two screw
removal.
3. Shall include an easily accessible unit Control
Board to conveniently and safely provide connec-
tion points for vital control functions such as:
smoke detectors, phase monitor, gas controller,
economizer, thermostat, DDC control options, and
low and high pressure switches. Controller shall
also provide an intuitive means to adjust the indoor
fan speed through a simple switch and pot adjust-
ment design.
M. (23 81 19.13.M.) Condenser Fans and Motors:
1. Condenser fan motors:
a. Shall be a totally enclosed motor.
b. Shall use permanently lubricated bearings.
c. Shall have inherent thermal overload protection
with an automatic reset feature.
d. Shall use a shaft-down design on all sizes.
2. Condenser Fans:
a. Shall be a direct-driven propeller type fan con-
structed of high impact composite material.
b. Shall have high impact composite blades com-
pletely formed into one piece without blade fas-
teners or connectors and shall be dynamically
balanced.
N. (23 81 19.13.N.) Special Features Options and
Accessories:
1. Integrated EconoMi$er
®
IV, EconoMi$er2, and
EconoMi$er X low leak rate models. (EconoMi$er
2, IV and X are factory-installed on 04-06 models.
EconoMi$er 2 and X are factory-installed on 07
models. All are field-installed on all 3 and 1 phase
models):
a. Integrated, gear driven opposing modulating
blade design type capable of simultaneous
economizer and compressor operation.
b. Independent modules for vertical or horizontal
return configuration shall be available. Vertical
return modules shall be available as a factory
installed option.
c. Damper blades shall be galvanized steel with
composite gears. Plastic or composite blades on
intake or return shall not be acceptable.
d. Shall include all hardware and controls to pro-
vide free cooling with outdoor air when tem-
perature and/or humidity are below setpoints.
e. Shall be equipped with gear driven dampers for
both the outdoor ventilation air and the return
air for positive air stream control.
f. Standard leak rate shall be equipped with damp-
ers not to exceed 2% leakage at 1 in. wg pres-
sure differential.
g. Economizer controller on EconoMi$er IV mod-
els shall be Honeywell W7212 that provides:
1) Combined minimum and DCV maximum
damper position potentiometers with com-
pressor staging relay.
2) Functions with solid-state analog enthalpy
or dry bulb changeover control sensing.
3) LED indicators for: when free cooling is
available, when module is in DCV mode,
when exhaust fan contact is closed.
h. Economizer controller on EconoMi$er X models
shall be the Honeywell W7220 that provides:
1) 2-line LCD interface screen for setup, con-
figuration and troubleshooting.
2) On-board Fault Detection and Diagnostics
(FDD) that senses and alerts when the
economizer is not operating properly, per
California Title 24, ASHRAE 90.1 and
IECC
1
.
3) Sensor failure loss of communication
identification.
4) Automatic sensor detection.
5) Capabilities for use with multiple-speed or
single speed indoor fan systems.
6) Utilize digital sensors: Dry bulb and
Enthalpy.
i. Economizer controller on EconoMi$er 2 models
with RTU Open or controls shall be a 4 to 20mA
design controlled directly by the controller. RTU
Open meets California Title 24, ASHRAE 90.1
and IECC Fault Detection and Diagnostic
(FDD) requirements.
j. Shall be capable of introducing up to 100% out-
door air.
k. Shall be equipped with a barometric relief
damper capable of relieving up to 100% return
air and contain seals that meet ASHRAE 90.1
requirements.
l. Shall be designed to close damper(s) during
loss-of-power situations with spring return built
into motor.
1. IECC is a registered trademark of the International Code Council,
Inc.
Guide specifications (cont)
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