Bryant 548J manual 9.Fan/Filter Status Switch

9.Fan/Filter Status Switch:

a.Switch shall provide status of indoor evaporator fan (ON/OFF) or filter (CLEAN/DIRTY).

b.Status shall be displayed either over communication bus (when used with direct digital controls) or with an indicator light at the thermostat.

10.Propeller Power Exhaust:

a.Power exhaust shall be used in conjunction with an integrated economizer.

b.Independent modules for vertical or horizontal return configurations shall be available.

c.Horizontal power exhaust is shall be mounted in return ductwork.

d.Power exhaust shall be controlled by economizer controller operation. Exhaust fans shall be energized when dampers open past the 0-100% adjustable setpoint on the economizer control.

11.Roof Curbs (Vertical):

a.Full perimeter roof curb with exhaust capability providing separate air streams for energy recovery from the exhaust air without supply air contamination.

b.Formed galvanized steel with wood nailer strip and shall be capable of supporting entire unit weight.

c.Permits installation and securing of ductwork to curb prior to mounting unit on the curb.

12.High-Static Indoor Fan Motor(s) and Drive(s) (04-09):

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

13.Thru-the-Bottom Utility Connectors:

a.Kit shall provide connectors to permit electrical connections to be brought to the unit through the basepan.

14.Fan/Filter Status Switch:

a.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.

15.Outdoor Air Enthalpy Sensor:

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

16.Return Air Enthalpy Sensor:

a.The return air enthalpy sensor shall be used in conjunction with an outdoor air enthalpy sensor to provide dif- ferential enthalpy control.

17.Indoor Air Quality (CO2) Sensor:

a.Shall be able to provide demand ventilation indoor air quality (IAQ) control.

b.The IAQ sensor shall be available in duct mount, wall mount, or wall mount with LED display. The setpoint shall have adjustment capability.

18.Smoke detectors:

a.Shall be a Four-Wire Controller and Detector.

b.Shall be environmental compensated with differential sensing for reliable, stable, and drift-free sensitivity.

c.Shall use magnet-activated test/reset sensor switches.

d.Shall have tool-less connection terminal access.

e.Shall have a recessed momentary switch for testing and resetting the detector.

f.Controller shall include:

(1.) One set of normally open alarm initiation contacts for connection to an initiating device circuit on a fire alarm control panel.

(2.) Two Form-C auxiliary alarm relays for interface with rooftop unit or other equipment.

(3.) One Form-C supervision (trouble) relay to control the operation of the Trouble LED on a remote test/reset station.

(4.) Capable of direct connection to two individual detector modules.

(5.) Can be wired to up to 14 other duct smoke detectors for multiple fan shutdown applications.

19.Time Guard

a.Shall prevent compressor short cycling by providing a 5-minute delay (±2 minutes) before restarting a com- pressor after shutdown for any reason.

b.One device shall be required per compressor.

20.Electric Heat:

a.Heating Section

(1.) Heater element open coil resistance wire, nickel-chrome alloy, 0.29 inches inside diameter, strung through ceramic insulators mounted on metal frame. Coil ends are staked and welded to terminal screw slots.

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