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GUIDE SPECIFICATIONS — 579F/580F180-300 AND 581A155,180 SIZE UNITS (cont)
11. Low-Ambient Kits:
When used, allows units to operate at lower outdoor
ambient temperatures. Sizes 155, 180, 210/216, and
300 will operate down to 10 F. Size 240 will operate
down to 25 F.
* 12. Enthalpy Sensor:
a. For use with Economi$er IV only.
b. Capable of comparing heat content (temperature
and humidity) of outdoor air and indoor air and
controlling economizer cut-in point at the most
economical level.
NOTE: Two accessory enthalpy sensors are
required for differential enthalpy control.
* 13. Electronic Programmable Thermostat:
Capable of using deluxe full-featured electronic
thermostat.
14. Hot Gas Bypass Dehumidification Package:
The dehumidification package is a factory-installed
option that provides increased dehumidification by
further subcooling the hot liquid refrigerant leaving
the condenser coil. The package consists of a single
row, 12.25 sq ft subcooling coil located on the leav-
ing airside of the evaporator coil. The location of this
coil in the indoor airstream greatly enhances the
latent capacity of the unit.
The package shall be equipped with low pressure
switch(es) and TXVs. Low pressure switch(es) pre-
vents evaporator coil freeze-up and TXVs assure a
positive superheat condition. If the operation of the
subcooling coil is controlled by a field-installed wall-
mounted humidistat, the dehumidification circuit will
then operate only when needed. Optional field con-
nections for the humidistat are made in the low volt-
age compartment of the unit control box.
15. Winter Start Time-Delay Relay:
Used in conjunction with the accessory low-ambient
kit or head pressure control device, permits opera-
tion in cooling at lower outdoor ambient tempera-
tures. See price pages for more information.
16. Liquid Propane Conversion Kit:
Kit shall contain all the necessary hardware and
instructions to convert a standard natural gas unit for
use with liquefied propane gas.
17. Hinged Access Panels for the Filter, Compressors,
Evaporator Fan, and Control Box Areas:
Filter hinged access panels permit tool-less entry for
changing filters. Evaporator fan hinged access panel
shall be field-convertible to a tool-less entry by
removing and discarding screws. Each external
hinged access panel shall be permanently attached
to the rooftop unit.
18. Convenience Outlet:
Shall be factory-installed and internally mounted with
an externally accessible 115-v, 15 amp. GFI, female
receptacle with hinged cover. Voltage required to
operate convenience outlet shall be provided by a
field-installed separate branch circuit.
19. Non-Fused Disconnect Switch:
Shall be factory-installed, internally mounted, NEC
and UL approved non-fused switch shall provide unit
power shutoff. The control access door shall be
interlocked with the non-fused disconnect. The dis-
connect switch must be in the OFF position to open
the control box access door. Shall be accessible
from outside the unit and shall provide power off
lockout capability.
20. Alternate Drive:
Shall provide higher static drive capability to en-
hance evaporator-fan performance rpm range.
21. Hail Guard, Condenser Coil Grille:
Shall protect the condenser coil from hail, flying
debris, and damage by large objects without increas-
ing unit clearances.
22. Ultraviolet Germicidal Lamps:
Ultraviolet germicidal lamps are designed to elimi-
nate odor causing mold and fungus that may develop
in the wet area of the evaporator section of the unit.
The high output, low temperature germicidal lamps
are field installed in the evaporator section of the
unit, aimed at the evaporator coil and condensate
pan. The short wavelength ultraviolet light inhibits
and kills mold, fungus and microbial growth. The
lamps have an output rating at 45 F in 400 fpm air-
flow of 120 microwatts/cm
2
at 1 meter.
23. Stainless Steel Condensate Pan:
Stainless steel condensate pans shall be available
for condensate collection.
24. Light Commercial Thermidistat™ Device:
Shall regulate temperature and humidity from one
location. Automatic humidity control adjusts indoor
humidity level between 50 and 90% RH (relative
humidity) based on the outdoor temperature sensor.
25. 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.
26. 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.
27. High-Static Motor(s) and Drive(s):
High-static motor(s) and drive(s) shall be factory-
installed to provide additional performance range.
28. Indoor Air Quality (CO
2
) Sensor:
a. Shall have the ability to provide demand ventila-
tion indoor air quality (IAQ) control through the
economizer with an IAQ sensor.
b. The IAQ sensor shall be available in duct mount,
wall mount, and wall mount with LED display. The
set point shall have adjustment capability.
29. Return Air CO
2
Sensor (EconoMi$er IV):
Sensor shall have the ability to provide demand ven-
tilation control through the EconoMi$er IV. The IAQ
sensor shall be duct mounted. The set point shall
have adjustment capability.
30. Outdoor Air Enthalpy Sensor (EconoMi$er IV or
EconoMi$er2):
The outdoor air enthalpy sensor shall be used to pro-
vide single enthalpy control. When used in conjunc-
tion with a return air enthalpy sensor, the controller
will provide differential enthalpy control. The sensor
allows the controller to determine if outside air is
suitable for free cooling.
579F/580F/581A155-300