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GUIDE SPECIFICATIONS (cont)
11. Return-Air Temperature Sensor:
The return-air temperature sensor shall be used with
the EconoMi$er device. When used in conjunction
with an outdoor-air temperature sensor, the
EconoMi$er device will provide differential tempera-
ture control.
12. Indoor-Air Quality (CO
2
) Sensor:
Shall have the ability to provide demand ventilation
indoor-air quality (IAQ) control through the
EconoMi$er with an IAQ sensor.
The IAQ sensor shall be available in duct mount, wall
mount and wall mount with LED display. The set
point shall have adjustment capability.
*13. Low Ambient Control Packages:
Each package consists of solid-state control and
condenser-coil temperature sensor to maintain con-
densing temperature between 90 F and 110 F at out-
door ambient temperatures down to –20 F by
condenser-fan speed modulation or condenser-fan
cycling.
*14. Thermostat and Subbase:
Provides staged cooling and heating automatic (or
manual) changeover, fan control, and indicator light.
15. Thru-The-Bottom Service Connection:
Kit shall provide connectors to permit electrical con-
nections to be brought to the unit through the
basepan.
16. Condenser Coil Hail Guard Assembly:
Hail guard shall protect against damage from hail
and flying debris.
17. Condenser Coil Guard Grille:
The grille protects the condenser coil from damage
by large objects without increasing unit clearances.
18. Compressor Cycle Delay:
Unit shall be prevented from restarting for a mini-
mum of 5 min. after shutdown.
19. Fan/Filter Status Switch:
Provides status of evaporator fan (ON/OFF) or
indoor-air filter (CLEAN/DIRTY). Status shall be dis-
played over communication bus when used with
direct digital controls or with an indicator light at the
thermostat.
20. Unit-Mounted, Non-Fused Disconnect Switch:
Shall be factory-installed, internally-mounted, NEC
and UL approved non-fused switch shall provide unit
power shutoff. Shall be accessible from outside the
unit and shall provide power off lockout capability.
21. Convenience Outlet:
Shall be factory-installed and internally-mounted
with easily accessible 115-v female receptacle. Shall
include 15 amp GFI receptacle with independent
fuse protection. Voltage required to operate con-
venience outlet shall be provided by a factory-
installed step-down transformer. Shall be accessible
from outside the unit.
22. High-Static Motor and Drive:
High-static motor and drive shall be factory-installed
to provide additional performance range.
23. EconoMi$er and Power Exhaust:
Package shall provide control of internal building
pressure. The system shall exhaust up to 100% of
return air.
24. Power Exhaust for Accessory EconoMi$er:
Two two-stage power exhausts shall be used in con-
junction with EconoMi$er to provide the system with
the capability to exhaust up to 100% of return air.
The power exhaust is a field-installed accessory for
vertical and horizontal applications.
25. Flue Hood Protector Assembly:
Provides protection from the hot sides of the gas flue
hood.
26. Liquid Propane Kit:
Package shall contain all the necessary hardware
and instructions to convert a standard natural gas
unit for use with liquefied propane.
27. NOx Reduction Unit:
Unit shall have reduced nitrous oxide (NOx) emis-
sions to meet the California Air Quality Management
NOx requirement of 40 nanograms/joule or less on
036-060 sizes.
28. Flue Discharge Deflector:
Package shall contain single-piece deflector and
hardware to exhaust the flue discharge up and away
from unit. The flue discharge deflector shall allow
minimum flue side clearances to combustibles to be
reduced to 18 inches.
29. Dehumidification Package:
The dehumidification package is a factory-installed
option that provides increased dehumidification by
further subcooling the hot liquid refrigerant leaving
the condenser coil. The package consists of a sub-
cooling coil located on the leaving-air side of the
evaporator coil. The location of this coil in the indoor
airstream greatly enhances the latent capacity of the
units.
The package shall be equipped with crankcase
heater(s), low pressure switch(es), and thermostatic
expansion valve(s) (TXV). Low pressure switch(es)
prevents evaporator coil freeze up and TXV(s)
assure a positive superheat condition. If the opera-
tion of the subcooling coil is controlled by a field-
installed, wall-mounted humidistat or LC Thermidis-
tat, the dehumidification circuit will then operate only
when needed. Optional field connections for the
humidistat are made in the low voltage compartment
of the unit control box.
30. Light Commercial Thermidistat:
Field-installed, wall mounted thermidistat is used to
control temperature and activation of Perfect
Humidity™ package. The thermidistat can be set for
humidity settings from 50% to 90% relative humidity.
31. Electronic Programmable Thermostat:
Capable of using deluxe full-featured electronic ther-
mostat. Shall use built-in compressor cycle delay
control for both heating and cooling duty.
32. Humidistat:
Field-installed, wall-mounted humidistat is used to
control activation of the dehumidification package.
The humidistat can be set for humidity levels
between 20% and 80% relative humidity.
33. Hinged Panel Option:
Hinged panel option provides hinged access panels
for the filter, compressor, evaporator fan, and control
box areas. Filter hinged panels permit tool-less entry
for changing filters. Each hinged panel is perma-
nently attached to the rooftop unit.