GUIDE SPECIFICATIONS — 524A (cont)

5. Electric Heaters:

Heaters for nominal 240, 480, or 575-volt, 3-phase,

60Hz power supply shall be factory-supplied for field installation as shown on the equipment drawings. Electric heat assembly shall be ETL and ETL, Can- ada, agency approved, and shall have single-point power wiring. Heater assembly shall include contac- tors with 24-v coils, power wiring, 24-v control wiring terminal blocks, and a hinged access panel. Electric heaters shall not be used with air discharge plenum.

6.Air Discharge Plenum:

Plenum shall be factory supplied to provide free-blow air distribution for vertical floor-mounted units. A grille with moveable vanes for horizontal or vertical airflow adjustment shall be included. Plenum shall be field-assembled and field-installed on the unit’s fan deck for blow-thru air distribution. Plenum shall not be used with electric heaters.

7. Return-Air Grille:

Grille shall be factory supplied for field installation on the unit’s return air opening.

8. Unit Subbase:

Subbase assembly shall be factory supplied for field installation. Subbase shall elevate floor-mounted vertical units to provide access for correct conden- sate drain connection.

9. Economizer:

Economizer for ventilation or “free” cooling shall be factory provided for field installation on either return air opening of air handler. For free cooling applica- tions, economizer shall be compatible with separate thermostat; economizer dampers shall open when outdoor air enthalpy is suitable for free cooling. Economizer shall include enthalpy control and damper actuator. Economizer shall be compatible with accessory CO2 sensor. Economizer damper shall open when indoor CO2 level rises above prede- termined set point.

A 2 to 10 vdc actuator adapter must be field-supplied and installed on economizer for demand control ven- tilation using the CO2 sensor accessory.

10.Thermostat Controls:

a.Commercial Electronic Thermostat with 7-day timeclock, auto-changeover, multi-stage capabil- ity, and large LCD temperature display.

b.Commercial Electronic Non-programmable Ther- mostat with auto-changeover, multi-stage capac- ity, and large LCD display.

11. Overhead Suspension Package:

Package shall include necessary brackets to support units in a horizontal ceiling installation.

12. Condensate Drain Trap:

Trap shall have transparent, serviceable design for easy cleaning. Kit shall include overflow shutoff switch and wiring harness for connection to an alarm if desired.

13. UV-C Germicidal Lamps:

UV-C emitters and fixtures shall be specifically designed for use inside an HVAC system. An ASME nozzled test apparatus using a 45 F airstream mov- ing at not less than 400 fpm shall measure individual lamp output. Lamp output at 253.7 nm shall not be less than 10µW/cm2 per inch of arc length measured at a distance of one meter.

a. UV-C power supplies shall be high efficiency, electric type which are matched to the emitters and are capable of producing the specified output intensity with an input power no more than

80watts.

b.Emitters and fixtures shall be installed in sufficient quantity and arranged so as to provide an equal distribution of UV-C energy on the coil and drain fan.

c.The minimum UV-C energy striking the leading edge of the coil fins shall be not less than

820µW/cm2 at the closest point and through placement, not less than 60% of that value at the farthest point. Equal amounts are to strike the drain pan, either directly or indirectly through reflection.

d.Emitters and fixtures shall be installed at right angles to the conforming lines of the coil fins, such that through incident angle reflection, UV-C energy strikes all target surfaces of the coil, drain pan, and the available line of sight airstream.

14. CO2 Sensor:

The field-installed CO2 ventilation sensor measures the amount of ventilation needed by the space and a proportional integral derivative loop (PID) calculation makes adjustments to the economizer minimum position during occupied operation. The indoor CO2 will be compared to an outdoor CO2 reference before making adjustments to the economizer minimum position.

524A072-300

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Bryant 569F, 576C, 569D, 566E, 566D manual Guide Specifications 524A, Air Discharge Plenum

569F, 566E, 566D, 569D, 576C specifications

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