Bryant 551A manual GUIDE SPECIFICATIONS - SIZES 036-150 cont, 558F/551B036-150

GUIDE SPECIFICATIONS — SIZES 036-150 (cont)

558F/551B036-150

*13. High-Static Motor and Drive (036-120 3-phase units only):

High static motor and drive shall be factory-installed to provide additional performance range.

14. Condenser Coil Grille:

The grille protects the condenser coil from damage by large objects without increasing unit clearances.

*15. Compressor Cycle Delay:

Unit shall be prevented from restarting for a mini- mum of 5 minutes after shutdown.

16. Fan/Filter Status Switch:

Provides status of evaporator fan (ON/OFF) or indoor-air filter (CLEAN/DIRTY). Status shall be dis- played with an indicator light at the thermostat.

*17. 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. (Cannot be used with units rated over 80 amps.)

*18. 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 conve- nience outlet shall be provided by a factory-installed step-down transformer. Shall be accessible from out- side the unit.

19. EconoMi$er and Power Exhaust:

EconoMi$er shall utilize a microprocessor based control and a gear driven damper system. EconoMi$er shall provide controls and spring return on power loss. The system shall exhaust up to 100% of the return air (vertical applications only).

20. Power Exhaust for Accessory EconoMi$er:

Two two-stage power exhaust shall be used in con- junction with EconoMi$er to provide the system with the capability to exhaust up to 100% of return air. The power exhaust is a field-installed accessory for vertical and horizontal applications.

*21. Dehumidification Package (551B Only):

22. Light-Commercial Thermidistat:

Field-installed, wall mounted thermidistat is used to control temperature and activation of Perfect Humid- ity™ package. The thermidistat can be set for humid- ity settings from 50% to 90% relative humidity.

23. Hinged Panel Option (551B only):

Shall be equipped with hinged access panels for the filter, compressor, evaporator fan, and control box areas. Filter hinged access panels permit tool-less entry for changing filters. Each hinged access panel is permanently attached to the rooftop unit.

24. Outdoor-Air Enthalpy Sensor:

The outdoor air enthalpy sensor shall be used with the EconoMi$er device to provide single enthalpy control. When used in conjunction with a return air enthalpy sensor, the EconoMi$er device will provide differential enthalpy control. The sensor allows the EconoMi$er controller to determine if outside air is suitable for free cooling.

25. Return-Air Enthalpy Sensor:

The return air enthalpy sensor shall be used with the EconoMi$er device. When used in conjunction with an outdoor air enthalpy sensor, the EconoMi$er device will provide differential enthalpy control.

26. Return-Air Temperature Sensor:

The return-air temperature sensor shall be used with the EconoMi$er device. When used in conjunction with an outdoor-air temperature sensor, the EconoMi$er device will provide differential tempera- ture control.

27. Indoor-Air Quality (CO2) Sensor:

Shall have the ability to provide demand ventilation indoor-air quality (IAQ) control through the EconoMi$er with an IAQ sensor.

The IAQ sensor shall be available in duct mount, wall mount and wall mount with LED display. The set point shall have adjustment capability.

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 subcooling coil located on the leaving-air side of the evaporator coil. The location of this coil in the indoor airstream greatly enhances the latent capacity of the 551B units.

The package shall be equipped with crankcase heater(s), low pressure switch(es), and TXV(s). Low pressure switch(es) prevents evaporator coil freeze up and TXV(s) assure a positive superheat condi- tion. If the operation of the subcooling coil is con- trolled by a field-installed, wall-mounted humidistat, the dehumidification circuit will then operate only when needed. Optional field connections for the humidistat are made in the low voltage compartment of the unit control box.

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