Bryant 549C manual GUIDE SPECIFICATIONS — 548F036-120cont, r.Control LEDs

GUIDE SPECIFICATIONS — 548F036-120 (cont)

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

i.The EconoMi$erIV and EconoMi$er2 shall have a gear-driven parallel blade design.

j.EconoMi$erIV microprocessor control shall pro- vide control of internal building pressure through its accessory power exhaust function. Factory set at 100%, with a range of 0% to 100%.

k.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 third party control interface).

l.EconoMi$erIV Microprocessor Occupied Mini- mum 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$erIV Microprocessor Unoccupied Mini- mum Damper Position Setting — The EconoMi$erIV damper shall be completely closed when the unit is in the occupied mode.

n.EconoMi$erIV Microprocessor IAQ/DCV Maxi- mum 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 minimum ventilation rate.

o.EconoMi$erIV Microprocessor IAQ/DCV control modulates the outdoor-air damper to provide ven- tilation based on the optional 2 to 10 vdc CO2 sensor input.

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

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

r.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.

s. Remote Minimum Position Control — A field- installed accessory remote potentiometer shall allow the outdoor-air damper to be opened or closed beyond the minimum position in the occu- pied mode for modified ventilation.

3. 50% 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.

4. 100% Manual Outdoor-Air Damper:

Manual damper package shall consist of damper birdscreen, and rainhood which can be preset to admit up to 100% outdoor air for year-round ventilation.

*5. 100% Two-Position Damper:

a.Two-position damper package shall include single blade damper. Admits up to 100% outdoor air.

b.Damper shall close upon indoor fan shutoff.

c.Designed to close damper during loss of power situations.

d.Equipped with barometric relief damper.

*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. Electric Resistance Heaters:

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

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

c.Available in multiples to match heating requirements.

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

*8. Head Pressure Control Packages:

Package shall consist of solid-state control and out- door-coil temperature sensor to maintain condensing temperature between 90 F and 110 F at outdoor ambient temperatures down to –20 F by outdoor fan speed modulation or outdoor fan cycling.

* 9. Thermostat and Subbase:

Thermostat and subbase provide staged cooling and heating automatic (or manual) changeover, fan con- trol, and indicator light.

10. Thru-The-Bottom Utility Connections:

Kit shall provide connectors to permit electrical con- nections to be brought to the unit through the basepan.

* 11. Electronic Programmable Thermostat:

Unit shall be capable of using deluxe full-featured electronic thermostat. Thermostat shall use built-in compressor cycle delay control for both heating and cooling duty. Thermostat shall be capable of working with third party direct digital controls.

548F

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