Product data

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b. Includes all hardware and controls to provide
cooling with outdoor air.
c. Equipped with low-leakage dampers, not to
exceed 2% leakage at 1 in. wg pressure dif-
ferential.
d. Capable of introducing up to 100% outdoor
air.
e. Economizer shall be equipped with a baro-
metric relief damper.
f. Designed to close damper(s) during loss-of-
power situations with spring return built into
motor.
g. Dry bulb outdoor-air temperature sensor
shall be provided as standard. Enthalpy, dif-
ferential temperature, and differential
enthalpy control shall be provided as an
option.
h. Economizer is a gear-driven parallel blade
design.
i. Economizer shall provide control of internal
building pressure through its accessory two-
stage power exhaust function.
j. Economizer shall be capable of control
from a 4 to 20 mA signal.
6. Barometric Relief Damper:
a. Package shall include damper, seals, hard-
ware, and hoods to relieve excess internal
pressure.
b. Damper shall close due to gravity upon unit
shutdown.
7. 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.
* 8. 25% Two-Position Damper:
a. Two-position damper package shall include
single blade damper and motor. Admits up
to 25% outdoor air.
b. Damper shall close upon indoor fan shutoff.
* 9. Head Pressure Control Package:
Consists of solid-state control and condenser-
coil temperature sensor to maintain condensing
temperature between 90 F and 110 F at out-
door ambient temperatures down to –20 F by
condenser-fan speed modulation or condenser-
fan cycling and wind baffles.
10. Electric Resistance Heaters:
a. Open wire nichrome elements with all nec-
essary safety operating controls.
b. UL listed and indicated on basic unit infor-
mation plate.
c. Available in multiples to match heating
requirements.
d. Single point kits available for each heater
when required.
*11. Electronic Programmable Thermostat:
Capable of using deluxe full-featured electronic
thermostat. Shall use built-in compressor cycle
delay control for both heating and cooling duty.
Capable of working with Carrier direct digital
controls.
*12. Thermostat and Subbase:
Provides staged cooling and heating automatic
(or manual) changeover, fan control, and indica-
tor light.
13. Unit-Mounted, Non-Fused Disconnect Switch:
Shall be factory-installed, internally mounted.
NEC and UL approved non-fused switch shall
provide unit power shutoff. Shall be accessible
from outside the unit and shall provide power
off lockout capability.
14. Convenience Outlet:
Shall be factory-installed and internally
mounted with easily accessible 115-v female
receptacle. Shall include 15 amp GFI receptacle
with independent fuse protection. Voltage
required to operate convenience outlet shall be
provided by a factory-installed step-down trans-
former. Shall be accessible from outside the
unit.
15. Compressor Cycle Delay:
Unit shall be prevented from restarting for min-
imum of 5 min. after shutdown.
16. Thru-the-Bottom Utility Connectors:
Kit shall provide connectors to permit electrical
connections to be brought to the unit through
the basepan.
17. Fan/Filter Status Switch:
Provides status of indoor (evaporator) fan (ON/
OFF) or filter (CLEAN/DIRTY). Status shall be
displayed over communication bus when used
with direct digital controls or with an indicator
light at the thermostat.
18. EconoMi$er and Power Exhaust:
Package shall provide control of internal build-
ing pressure. The two-stage system shall
exhaust up to 100% of return air (vertical only).
19. Two-Stage Power Exhaust Accessory for
EconoMi$er:
Power exhaust shall be used in conjunction with
EconoMi$er to provide system exhaust of up to
100% of return air. The power exhaust is a
field-installed accessory (vertical and horizontal
applications).
The individual fans are energized through the
end switches located in the actuator, which will
open as the outdoor-air damper opens. These
end switches are factory set for 30 and 70% of
50TFQ004-01250HJQ014,016