Guide Specifications Ð 580D036-150

GUIDE SPECIFICATIONS Ð 580D036-150 (cont)

5.The integrated gas controller (IGC) board shall include gas heat operation fault noti®cation using an LED (light-emitting diode).

6.Unit shall be equipped with anti-cycle protection with one short cycle on unit ¯ame rollout switch or 4 con- tinuous short cycles on the high-temperature limit switch. Fault indication shall be made using an LED.

7.The IGC board shall contain algorithms that modify evaporator-fan operation to prevent future cycling on high-temperature limit switch.

8.The LED shall be visible without removal of control box access panel.

G.Refrigerant Components:

Refrigerant circuit components shall include:

1.Fixed ori®ce feed system.

2.Refrigerant strainer.

3.Service gage connections on suction, discharge, and liquid lines.

H.Filter Section:

1.Standard ®lter section shall consist of factory- installed, low velocity, throwaway 2-in. thick ®berglass ®lters of commercially available sizes.

2.Filter face velocity shall not exceed 320 fpm at nomi- nal air¯ows.

3.Filter section should use only one size ®lter.

4.Filters shall be accessible through an access panel with ``no-tool'' removal.

I.Controls and Safeties:

1.Unit Controls:

Unit shall be complete with self-contained low-voltage control circuit protected by an auto-reset device.

2.Safeties:

a.Unit shall incorporate compressor overtempera- ture and overcurrent safety devices to shut off compressor.

b.Heating section shall be provided with the follow- ing minimum protections:

1)High-temperature limit switch.

2)Induced-draft motor speed sensor.

3)Flame rollout switch.

4)Flame proving controls.

J.Operating Characteristics:

1.Unit shall be capable of starting and running at 115 F ambient outdoor temperature, meeting maxi- mum load criteria of ARI Standard 210/240 or 360.

2.Compressor with standard controls shall be capable of operation down to 25 F ambient outdoor temperature.

K.Electrical Requirements:

All unit power wiring shall enter unit cabinet at a single factory-predrilled location.

L.Motors:

1.Compressor motors shall be cooled by refrig- erant gas passing through motor windings and shall have line break thermal and current overload protection.

2.Evaporator-fan motor shall have permanently lubri- cated bearings and inherent automatic-reset thermal overload protection.

3.Totally enclosed condenser-fan motor shall have per- manently lubricated bearings, and inherent automatic- reset thermal overload protection.

4.Induced-draft motor shall have permanently lubricated sealed bearings and inherent automatic-reset thermal overload protection.

M.Special Features:

Certain features are not applicable when the features designated * are speci®ed. For assistance in amending the speci®cations, contact your local sales of®ce.

1.Roof Curbs (Horizontal and Vertical):

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

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

*2. Integrated Economizers:

a.Integrated integral modulating type capable of simultaneous economizer and compressor operation.

b.Includes all hardware and controls to provide cooling with outdoor air.

c.Equipped with low-leakage dampers, not to ex- ceed 3% leakage at 1 in. wg pressure differential (variable sliding plate economizer only) or parallel blade design.

d.Capable of introducing up to 100% outdoor air.

e.Parallel opposed blade economizer shall be equipped with a barometric relief damper with up to 30% of return air (036-072) or 45% of return air (090-150) relief. The variable sliding plate econo- mizer is equipped with 30% of return-air relief (036-150).

f.Designed to close damper during loss-of-power situations with emergency power supply (variable sliding plate economizer) or spring return built into motor (parallel opposed blade economizer).

g.Dry bulb outdoor-air thermostat (variable sliding plate economizer) or enthalpy (parallel opposed blade economizer) protection shall be provided as standard.

h.Variable sliding plate economizer is a guillotine- style damper, and the parallel opposed blade economizer is a parallel blade design.

i.Parallel opposed blade economizer shall provide control of internal building pressure through its in- herent power exhaust function.

j.Parallel opposed blade economizer shall be ca- pable of exhausting up to 100% outdoor air.

NOTE: Parallel opposed blade type economizer shall also be available with power exhaust.

*3. Manual Outdoor-Air Damper:

Manual damper package shall consist of damper, birdscreen, and rainhood which can be preset to ad- mit up to 50% outdoor air for year round ventilation.

*4. 100% Two-Position Damper:

a.Two-position damper package shall include single blade damper and motor. Admits up to 100% out- door air.