Carrier 50TFF007-014 Product Data page 43

2. Standard Safeties:
a. Unit shall incorporate compressor over-
temperature and overcurrent safety devices to
shut off compressor.
b. Heating section shall be provided with the fol-
lowing minimum protections:
1) High-temperature limit switches.
2) Overcurrent protection.
3. Refrigerant Controls:
Shall contain high-pressure, loss-of-charge/
low-pressure,
switches.
I. Operating Characteristics:
1. Unit shall be capable of starting and running at
46.1 C (115 F) ambient outdoor temperature,
meeting maximum load criteria of ARI Standard
210/240 or 360 (U.S.A. Standard) at ± 10%
voltage.
2. Compressor with standard controls shall be
capable of operation down to –4 C (25 F) ambi-
ent outdoor temperature.
J. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a sin-
gle factory-predrilled location.
K. Motors:
1. Compressor motors shall be cooled by refriger-
ant passing through motor windings and shall
have line break thermal and current overload
protection.
2. Indoor blower (evaporator-fan) motor shall have
permanently lubricated bearings and inherent
automatic-reset thermal overload protection.
3. Totally enclosed condenser-fan motor shall have
permanently lubricated bearings, and inherent
automatic-reset thermal overload protection.
L. Special Features:
Certain features are not applicable when the features
designated by * are specified. For assistance in
amending the specifications, your local Carrier Sales
Office should be contacted.
* 1. Direct Digital Controls:
a. Shall be available as a factory-installed option.
b. Shall actively monitor all modes of operation,
as well as evaporator-fan status, filter status,
indoor-air quality, supply-air temperature, and
outdoor-air temperature.
c. Shall work with Carrier TEMP and VVT®
systems.
d. Shall have built-in diagnostics for thermostat
commands for both staged heating and cool-
ing, evaporator-fan operation, and econo-
mizer operation.
e. Shall be equipped with a 5-minute time delay
between modes of operation.
2. Roof Curbs: (Horizontal and Vertical)
a. Formed galvanized steel with wood nailer
strip and capable of supporting entire unit
weight.
b. Allows for installing and securing ductwork to
curb prior to mounting unit on the curb.
and freeze protection
* 3. Integrated Economizer:
a. Integrated integral-modulating type capable
of simultaneous economizer and compressor
operation.
b. Includes all hardware and controls to provide
cooling with outdoor air.
c. Equipped with low-leakage dampers not to
exceed 3% leakage, at 249 Pa (1 in. wg) pres-
sure differential (Durablade economizer).
d. Capable of introducing up to 100% outdoor
air in both minimum and fully open positions.
e. Equipped with a gravity relief sliding plate
damper (Durablade economizer). Damper
shall close upon unit shutoff.
f. EconoMi$er shall be equipped with a baro-
metric relief damper with up to 100% of
return air (007) or 90% of return air (008-
014) relief. Durablade
equipped with 30% of return-air relief.
g. Designed to close damper during loss-of-
power situations with emergency power sup-
ply (Durablade economizer) or spring return
built into motor (EconoMi$er).
h. Dry bulb outdoor-air thermostat (Durablade
economizer) shall be provided as standard.
Enthalpy control shall be provided as an
option.
i. Durablade economizer is a guillotine-style
damper and EconoMi$er is a parallel-blade
design.
NOTE: EconoMi$er shall also be available
with field-installed power exhaust accessory.
* 4. Manual Outdoor-Air Damper:
Manual damper package shall consist of
damper, birdscreen, and rainhood which can be
preset to admit up to 50% outdoor air for year-
round ventilation.
* 5. 100% Open Two-Position Damper:
a. Two-position damper package shall include
single blade damper and motor. Admits up to
100% outdoor air.
b. Damper shall close upon indoor (evaporator)
fan shutoff.
c. Designed to close damper during loss of
power situations.
d. Equipped with barometric relief damper.
* 6. 25% Open Two-Position Damper:
a. Two-position damper package shall include
single blade damper and motor. Admits up to
25% open outdoor air.
b. Damper shall close upon indoor (evaporator)
fan shutoff.
c. Designed to close damper during loss of
power situations.
d. Equipped with barometric relief damper.
* 7. Solid-State Enthalpy Control:
a. For use with
package.
b. Capable of sensing outdoor-air enthalpy
content (temperature and humidity) and
economizer is
Durablade economizer
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