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GUIDE SPECIFICATIONS (cont)
L. Motors:
1. Compressor motors shall be of the refrigerant-cooled
type with line-break thermal and current overload
protection.
2. All fan motors shall have permanently lubricated bear-
ings, and inherent, automatic reset, thermal overload
protection.
3. Condenser-fan motor shall be totally enclosed.
M. Special Features:
1. Louvered Grille:
Wire grille shall be standard on all units. Louvered
grille shall be available as a factory-installed option to
provide hail guard and vandalism protection.
2. Coil Options:
Shall include factory-installed optional copper/copper
and vinyl-coated refrigerant coils.
3. Economizer:
a. Economizer controls capable of providing free
cooling using outside air.
b. Equipped with low leakage dampers not to
exceed 3% leakage, at 1.0 in. wg pressure
differential.
c. Spring return motor shuts off outdoor damper on
power failure.
4. Flat Roof Curb:
Curbs shall have seal strip and a wood nailer for flash-
ing and shall be installed per manufacturer’s
instructions.
5. Manual Outdoor Air Damper:
Package shall consist of damper, birdscreen, and rain-
hood which can be preset to admit outdoor air for
year-round ventilation.
6. Thermostat:
To provide for one-stage heating and cooling in addi-
tion manual or automatic changeover and indoor fan
control.
7. Natural-to-Propane Conversion Kit:
Shall be complete with all required hardware to con-
vert to liquid propane (LP) operation at 3.5 in. wg
manifold pressure.
8. Low Ambient Package:
Shall consist of a solid-state control and condenser
coil temperature sensor for controlling condenser-fan
motor operation, which shall allow unit to operate
down to 0° F outdoor ambient temperature.
9. Filter Rack Kit:
Shall provide filter mounting for downflow applications.
10. Controls Upgrade Kit:
Shall provide high and low pressure safety
protection.
11. Square-To-Round Duct Transitions:
Shall have the ability to convert the supply and return
openings from rectangular to round.
12. Compressor Protection:
Solid-state control shall protect compressor by pre-
venting ‘‘short cycling.’’
13. Duct Conversion Kit:
Shall enable conversion of a factory supplied side
discharge unit to downflow discharge airflow unit.
14. Crankcase Heater:
Shall provide anti-floodback protection for low-load
cooling applications.
15. High Altitude Kit:
Shall consist of natural gas orifices to compensate
for gas heat operation at 2001 to 6000 ft above sea
level.
16. Low NO
x
Kit:
Shall provide NO
x
reduction to values below
40 nanograms/joule to meet California emission
requirements.
17. Compressor Hard Start Kit:
Shall provide additional starting torque for single-
phase compressors.
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