23
50ZH
2. All fan motors shall have permanently lubricated bear-
ings and inherent automatic-reset thermal overload
protection.
3. Outdoor-fan motor shall be totally enclosed.
K. Special Features:
1. Electric Resistance Heaters:
a. Open-wire nichrome elements with all necessary
safety and operating controls.
b. Heaters are UL listed as indicated on basic unit in-
formative plate.
c. Each heater assembly shall include the following
safety features:
1) Automatic-reset switches
2) Heat limiters for primary and secondary, over-
current, and thermal protection.
d. Available with power single-point connections.
2. Outdoor Thermostat Kit:
Thermostat allows for staging of electric heaters based
on outdoor-air temperature.
3. Thermostat and Subbase:
Provides staged cooling and heating automatic (or
manual) changeover, fan control.
4. Electronic Programmable Thermostat:
Thermostat provides 2-stage heating and 2-stage cooling
control with remote communication ability.
L. Grille
1. Louvered Grille:
Louvered grille shall be standard on all units.
M. Special Features Available
1. Coil Options:
Shall include factory-installed optional copper/cop-
per and vinyl-coated refrigerant coils.
2. 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.
3. Flat Roof Curb:
Curbs shall have seal strip and a wood nailer for flash-
ing and shall be installed per manufacturer’s instruc-
tions.
4. 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.
5. Thermostat:
To provide for one-stage heating and cooling in addi-
tion manual or automatic changeover and indoor fan
control.
6. Low Ambient Package:
Shall consist of a solid-state control and outdoor coil
temperature sensor for controlling outdoor fan mo-
tor operation, which shall allow unit to operate
down to 0° F outdoor ambient temperature in cool-
ing.
7. Filter Rack Kit:
Shall provide filter mounting for downflow applica-
tions.
8. Square-To-Round Duct Transitions:
Shall have the ability to convert the supply and return
openings from rectangular to round. (030-048 only)
9. Crankcase Heater:
Shall provide anti-floodback protection for low-load
cooling applications. (Standard on 042-060 sizes)
10. Electric heaters:
a. Electric heater shall be available as a field-installed
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.
11. Compressor Hard start kit:
Shall be available to give a boost to the compressor
motor at each start-up.
Guide specifications (cont)
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