GUIDE SPECIFICATIONS — 549B036-120, 549C024-060 (cont)

549B, 549C

*5. 25% Two-Position Damper:

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

b.Damper shall close upon indoor fan shutoff.

*6. Head Pressure Control Package:

Control package shall consist of solid-state control and condenser-coil temperature sensor to maintain condensing temperature 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.

7.Electric Resistance Heaters:

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.

*8. 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.

* 9. Thermostat and Subbase:

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

* 10. Outdoor Coil Hail Guard Assembly:

Hail guard shall protect against damage from hail and flying debris.

11. Unit-Mounted, Non-Fused Disconnect Switch:

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

12. Convenience Outlet:

Switch shall be factory-installed and internally mounted with easily accessible 115-v female recep- tacle. Switch shall include 15 amp GFI receptacle with independent fuse protection. Voltage required to operate convenience outlet shall be provided by a factory-installed step-down transformer. Switch shall be accessible from outside the unit.

NOTE: Convenience outlet shall be designed for short duration electrical maintenance loads, and for use with long term electrical supply.

13. Outdoor Coil Grille:

The grille protects the outdoor coil from damage by large objects without increasing unit clearances.

14. Compressor Cycle Delay:

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

15. Thru-the-Bottom Utility Connectors:

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

16. Fan/Filter Status Switch:

Switch shall provide 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.

17.Power Exhaust Accessory for EconoMi$erIV or EconoMi$er2:

Power exhaust shall be used in conjunction with EconoMi$erIV or EconoMi$er2 to provide system exhaust of up to 100% of return air (vertical only). The power exhaust is a field-installed accessory (separate vertical and horizontal design).

NOTE: Horizontal power exhaust is intended to mount in return ductwork.

As the outdoor-air damper opens and closes, both propeller fans are energized and de-energized through the EconoMi$erIV controller. The set point is factory set at 100% of outdoor-air, and is adjustable 0 to 100% to meet specific job requirements. Avail- able in 208/230-1-60 v or 460-3-60 v. An LED light on the controller indicates when the power exhaust is operating.

For the EconoMi$er2, the power exhaust shall be controlled by the third party controls.

18.Outdoor Air Enthalpy Sensor (EconoMi$erIV or EconoMi$er2):

The outdoor air enthalpy sensor shall be used with the EconoMi$erIV or EconoMi$er2 device to provide single enthalpy control. When used in conjunction with a return air enthalpy sensor, the controller will provide differential enthalpy control. The sensor allows the con-troller to determine if outside air is suitable for free cooling.

19.Return Air Enthalpy Sensor (EconoMi$erIV or EconoMi$er2):

The return air enthalpy sensor shall be used with the EconoMi$erIV or EconoMi$er2 device. When used in conjunction with an outdoor air enthalpy sensor, the EconoMi$erIV or EconoMi$er2 device will pro- vide differential enthalpy control.

20.Return Air Temperature Sensor (EconoMi$erIV or EconoMi$er2):

The return air temperature sensor shall be used with the EconoMi$erIV or EconoMi$er2 device. When used in conjunction with the standard outdoor air temperature sensor, the EconoMi$erIV or EconoMi$er2 device will provide differential temper- ature control.

21.Outdoor Air/Return Air Temperature Sensor (adjust- able) (EconoMi$er2):

Optional sensor uses a third party control to control outdoor air damper and compressor operation.

22.Indoor Air Quality (CO2) Sensor (EconoMi$er2):

a.Shall have the ability to provide demand ventila- tion indoor air quality (IAQ) control through the EconoMi$er2 with an IAQ sensor.

b.The IAQ sensor shall be available in duct mount, wall mount, and wall mount with LED display. The set point shall have adjustment capability.

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