Bryant 548F, 549B GUIDE SPECIFICATIONS — 542J150,180 UNITS cont, K.Electrical Requirements

GUIDE SPECIFICATIONS — 542J150,180 UNITS (cont)

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 refrigerant gas passing through motor windings and shall have line break thermal and current overload protection.

2.Indoor-fan motor shall have permanently lubricated bearings and inherent automatic-reset thermal over- load protection.

3.Totally enclosed outdoor-fan motor shall have perma- nently lubricated bearings, and inherent automatic- reset thermal overload protection.

M.Special Features:

Certain features are not applicable when the features designated * are specified. For assistance in amending the specifications, contact your local Bryant Sales Office.

1.Roof Curbs (Horizontal and Vertical):

5. 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.

*6. 25% Two-Position Damper:

a.Two-position damper package shall include single blade damper and motor. Admits up to 25% out- door air.

b.Damper shall close upon indoor fan shutoff.

*7. Head Pressure Control Package:

Consists of solid-state control and condenser-coil temperature sensor to maintain condensing temper- ature between 90 F and 110 F at outdoor ambient temperatures down to –20 F by condenser-fan speed modulation or condenser-fan cycling and wind baffles.

*8. Electric Resistance Heaters:

542J150,180

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. Horizontal Adapter Roof Curb:

Includes factory-assembled adapter and duct which substantially improves indoor fan static motor perfor- mance (static regain).

NOTE: Power exhaust and barometric relief must be mounted in the return ductwork when used in con- junction with this accessory.

*3. Integrated EconoMi$er:

a. Integrated integral modulating type capable of simultaneous EconoMi$er and compressor operation.

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

c. Equipped with low-leakage dampers, not to exceed 2% leakage at 1 in. wg pressure differential.

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

e.EconoMi$er shall be equipped with a barometric relief damper.

f.Designed to close damper(s) during loss-of- power situations with spring return built into motor.

g.Dry bulb outdoor-air temperature sensor shall be provided as standard. Enthalpy, differential tem- perature, and differential enthalpy control shall be provided as an option.

h.EconoMi$er is a gear-driven parallel blade design.

i.EconoMi$er shall provide control of internal build- ing pressure through its accessory two-stage power exhaust function.

j.EconoMi$er shall be capable of control from a 4 to 20 mA signal.

4.Barometric Relief Damper:

a.Open wire nichrome elements with all necessary safety operating controls.

b.UL listed and indicated on basic unit information plate.

c.Available in multiples to match heating requirements.

d.Single point kits available for each heater when required.

*9. Electronic Programmable Thermostat:

Capable of using deluxe full-featured electronic ther- mostat. Shall use built-in compressor cycle delay control for both heating and cooling duty.

*10. Thermostat and Subbase:

Provides staged cooling and heating automatic (or manual) changeover, fan control, and indicator light.

*11. 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.

*12. 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.

*13. Compressor Cycle Delay:

Unit shall be prevented from restarting for minimum of 5 min. after shutdown.

*14. 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.

a. Package shall include damper, seals, hardware, and hoods to relieve excess internal pressure.

b. Damper shall close due to gravity upon unit shutdown.

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