Bryant 581A/B manual 257

GUIDE SPECIFICATIONS — 581A210-300 UNITS (cont)

M. Special Features:	o. Compressor lockout sensor (opens at 35 F,
Certain features are not applicable when the features	closes at 50 F).
	p. Actuator shall be direct coupled to economizer
designated * are specified. For assistance in amending
the specifications, contact your local Bryant Sales Office.	gear, eliminating linkage arms and rods.
1. Full Perimeter Roof Curbs (Horizontal and Vertical):	q. Control LEDs:

a.Formed of 14-gage galvanized steel with wood nailer strip and shall be capable of supporting entire unit weight.

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

c.Retrofit roof curb kit shall be available for fit up to existing Bryant roof curbs.

*2. Integrated Economizer:

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

b. Available as a factory-installed option in vertical supply/return configuration only. (Available as a field-installed accessory for dedicated horizontal and/or vertical supply return configurations.)

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

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

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

f.EconoMi$er IV shall be equipped with a baromet- ric relief damper.

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

h.Dry bulb outdoor-air temperature sensor shall be provided as standard. Outdoor air sensor set point is adjustable and shall range from 40 to 100 F. For the EconoMi$er IV, the return air sen- sor, indoor enthalpy sensor, and outdoor enthalpy sensor shall be provided as field-installed acces- sories to provide enthalpy control, differential enthalpy control, and differential dry bulb temper- ature control.

i.EconoMi$er IV controller shall use a mixed air thermistor mounted on the evaporator fan hous- ing to control EconoMi$er IV operation to a supply air temperature of 55 F.

j.The EconoMi$er IV shall have a gear-driven par- allel blade design.

k.EconoMi$er IV controller shall provide control of internal building pressure through its accessory power exhaust function. Factory set at 100%, with a range of 0% to 100%.

l.EconoMi$er IV controller Occupied Minimum Damper Position Setting maintains the minimum airflow into the building during occupied period providing design ventilation rate for full occupancy (damper position during heating). A remote potentiometer may be used to override the set point.

m.EconoMi$er IV controller Unoccupied Minimum Damper Position Setting — The EconoMi$er IV dampers shall be completely closed when the unit is in the occupied mode.

n.EconoMi$er IV controller IAQ/DCV control modu- lates the outdoor-air damper to provide ventilation

based on the optional 2 to 10 vdc CO2 sensor input.

1)When the outdoor air damper is capable of providing free cooling, the “Free Cool” LED shall illuminate.

2)The IAQ LED indicates when the module is on the DCV mode.

3)The EXH LED indicates when the exhaust fan contact is closed.

r.Remote Minimum Position Control — A field- installed accessory remote potentiometer allows the outdoor air damper to be opened or closed beyond the minimum position in the occupied mode for modified ventilation.

*3. Barometric Relief Damper Package:

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

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

*4. Power Exhaust:

Package shall include an exhaust (centrifugal style) fan, 1 Hp 208-230, 460 v (factory-wired for 460 v) direct-drive motor, and damper for vertical flow units with economizer to control over-pressurization of building.

*5. Thermostats and Subbases:

Units shall provide staged heating and cooling in addition to automatic (or manual) changeover and fan control.

*6. Electronic Programmable Thermostat:

Thermostat shall be capable of using deluxe full- featured electronic thermostat.

7. Liquefied Propane Conversion Kit:

Kit shall contain all the necessary hardware and instructions to convert a standard natural gas unit for use with liquefied propane gas.

8. Convenience Outlet:

Outlet shall be factory-installed and internally mounted with an externally accessible 115-v, 15 amp GFI, female receptacle with hinged cover. A step down transformer shall be included so no additional wiring is necessary.

9. Non-Fused Disconnect Switch:

Switch shall be factory-installed, internally mounted, NEC and UL approved. Non-fused switch shall pro- vide unit power shutoff. Shall be accessible from out- side the unit and shall provide power off lockout capability.

10. Hail Guard, Condenser Coil Grille:

Grille shall protect the condenser coil from hail, flying debris, and damage by large objects without increas- ing unit clearances.

11. Horizontal Kit:

Horizontal kit shall contain all the necessary hard- ware to convert a vertical airflow unit to a horizontal airflow unit.

The unit shall also be available as a horizontal air- flow unit directly from the factory.

581A210-300

257