Bryant 581A/B manual 253

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/cm2 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 (CO2) 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 CO2 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.

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