Bryant 581A/B manual 141

GUIDE SPECIFICATIONS — 580F036-151 AND 581B036-150 (cont)

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

1)High-temperature limit switches.

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 125 F ambient outdoor temperature, meeting maximum load criteria of ARI Standard 210/240 or 360 at

+10% voltage.

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 refrigerant 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. Evaporator motors are designed specifically for Bryant and do not have conventional horsepower (HP) ratings listed on the motor name- plate. Motors are designed and qualified in the “air- over” location downstream of the cooling coil and carry a maximum continuous bhp rating that is the maximum application bhp rating for the motor; no “safety factors” above that rating may be applied.

3.Totally enclosed condenser-fan motor shall have permanently lubricated bearings, and inherent auto- matic-reset thermal overload protection.

4.Induced-draft motor shall have permanently lubri- cated sealed 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):

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 opera- tion. During economizer operation, up to two compressors on sizes 090-150 will operate.

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$er IV and EconoMi$er2 shall be equipped with a barometric relief damper capable of relieving up to 100% return air.

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$er IV, the return air sen- sor, indoor enthalpy sensor, and outdoor enthalpy sensor shall be provided as field-installed acces- sories to provide enthalpy control, differential enthalpy control, and differential dry bulb temper- ature control. For the EconoMi$er2, the enthalpy, differential temperature (adjustable), and differen- tial enthalpy control shall be provided as field- installed accessories.

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$er IV and EconoMi$er2 shall have a gear-driven parallel 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$er2 shall be capable of control from a 4 to 20 mA signal through optional 4 to 20 mA design without microprocessor control (required for PremierLink™ or third party control interface).

m.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.

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

o.EconoMi$er IV controller IAQ/DCV Maximum Damper Position Setting — Setting the maximum position of the damper prevents the introduction of large amounts of hot or cold air into the space. This position is intended to satisfy the base mini- mum ventilation rate.

p.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.

q.Compressor lockout sensor (opens at 35 F, closes at 50 F).

r.Actuator shall be direct coupled to economizer gear, eliminating linkage arms and rods.

s.Control LEDs:

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.

580F036-151 AND 581B036-150

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