GUIDE SPECIFICATIONS — 580D036-150 (cont)
b. Damper shall close upon indoor (evaporator) fan
shutoff.
c. Designed to close damper during loss of power
situations.
d. Equipped with 15% barometric relief damper.
* 5. 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 (evaporator) fan
shutoff.
c. Designed to close damper during loss of power
situations.
d. Equipped with barometric relief damper.
* 6. Solid-State Enthalpy Control:
a. For use with variable sliding plate economizer
package only.
b. Capable of sensing outdoor-air heat content (tem-
perature and humidity) and control economizer
cut-in point to have minimum heat content air
passing over the evaporator coil for most efficient
system operation.
* 7. Differential Enthalpy Sensor:
a. For use with economizer only.
b. Capable of comparing heat content (temperature
and humidity) of outdoor air and return air and
controlling economizer cut-in point at the most
economical level.
* 8. Head Pressure Control Package:
Consists of solid-state control and condenser-coil
temperature sensor to maintain condensing tem-
perature between 90 F and 110 F at outdoor ambient
temperatures down to −20 F by condenser-fan speed
modulation or condenser-fan cycling.
9. LP (Liquid Propane) Gas Conversion Kit:
Package shall contain all the necessary hardware
and instructions to convert a standard natural gas
unit for use with liquefied propane gas.
* 10. Commercial Programmable Thermostat:
Seven-day commercial progammable thermostat
shall be capable of auto-changeover, F/C, 3-stage
heating and 2-stage cabling. Thermostat shall also
be equipped with complete system status display.
* 11. Flue Shield:
Provides protection from the hot sides of the gas flue
hood.
* 12. Thermostat and Subbase:
Provides staged cooling and heating automatic (or
manual) changeover, fan control, and indicator light.
* 13. Condenser Coil Hail Guard Assembly:
Hail guard shall protect against damage from hail
and flying debris.
14. NO
x
Reduction Kit:
Package shall contain all necessary hardware and
instructions to convert a standard natural gas unit to
reduce the nitrous oxide (NO
x
) emissions to a level
of 40 nanograms/joule or less for unit sizes 036-060
being installed in California Air Quality Management
Districts.
15. Controls Upgrade Kit:
Kit shall contain high-pressure, loss-of-charge/low-
pressure, and freeze protection switches. It shall
mount on factory-installed Schrader fittings.
16. Alternate Motor(s) and/or Drive(s) (036-060, 090,
120, 150):
Alternate motor(s) and drive(s) shall be factory-
installed to provide additional performance range.
17. Flue Discharge Deflector:
Flue discharge deflector directs unit exhaust verti-
cally instead of horizontally.
* 18. Condenser Coil Grille:
The grille protects the condenser coil from damage
by large objects without increasing unit clearances.
19. Compressor Cycle Delay:
Unit shall be prevented from restarting for minimum
of 5 min. after shutdown.
20. Thru-the-Bottom Service Connectors:
Kit shall provide connectors to permit gas and elec-
trical connections to be brought to the unit through
the basepan.
21. 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.
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