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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. wc pressure differential.
c. Spring return motor shuts off outdoor damper on power
failure.
4. Flat Roof Curb:
Curbsshall have seal strip and a wood nailerfor flashing and
shall be installed per manufacturer’s instructions.
5. Manual Outdoor Air Damper:
Package shall consist of damper, birdscreen, and rainhood
which can be preset to admit outdoor air foryear--round ven-
tilation.
6. 6. Thermostat:
To provide for one--stage heating and cooling in addition
manual or automatic changeover and indoor fan control.
7. Low Ambient Package:
Shall consist of a solid--state control and outdoor coil tem-
perature sensor for controlling outdoor--fan motor opera-
tion, which shall allow unit to operate down to 0_F
(--17.7_C) outdoor ambient temperature.
8. Filter Rack Kit:
Shall provide filter mounting for downflow applications.
9. Controls Upgrade Kit:
Shall provide high and low pressure safety protection.
10. Square--To--Round Duct Transitions (024--048):
Shall have the ability to convert the supply and return open-
ings from rectangular to round.
11. Crankcase Heater:
Shallprovideanti--floodback protectionfor lowload cooling
applications.
12. Electric heaters:
a. Electric heater shall be available as a fieldinstalled option.
b. Heater elements shall be open wire type, adequately
supported and insulated with ceramic bushings.
c. Electric heater packages must provide single point power
connection capability.
50SZ
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