I. Operating Characteristics:
1. Unit shall be capable of starting and running at
125 F ambient outdoor temperature per maxi-
mum load criteria of ARI Standard 210/240.
2. Compressor with standard controls shall be ca-
pable of operation in cooling down to 40 F am-
bient outdoor temperature.
3. Unit provided with fan time delay to prevent cold
air delivery before heat exchanger warms up.
4. Unit provided with fan time-delay after the ther-
mostat is satisfied.
J. Electrical Requirements:
All unit power wiring shall enter unit cabinet at a single
location.
K. 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-
bearings and inherent automatic reset thermal
overload protection.
3. Condenser-fan motor shall be totally enclosed.
L. Special Features:
1. Roof Curb:
Curb shall have seal strip and a wood nailer for
flashing and shall be installed per manufacturer’s
instructions.
2. 25% Open Manual Outdoor-Air Damper:
Manual damper package shall consist of damper,
birdscreen, and rainhood which can be preset
to admit outdoor air for year-round ventilation.
3. Thermostat and Subbase:
To provide for one-stage heating and cooling
in addition to manual or automatic changeover
and fan control.
4. Electronic Programmable Thermostat:
Thermostat provides 2-stage heating and 2-stage
cooling control with remote communication
ability.
5. Natural-to-Propane Conversion Kit:
Kit shall be complete with burner orifice(s).
6. Low Ambient Package:
Package shall consist of a solid-state control and
condenser coil temperature sensor for control-
ling outdoor-fan motor operation, which shall al-
low unit to operate down to 0° F outdoor ambi-
ent temperature.
7. Compressor Short-Cycle Protection:
Solid-state control shall protect compressor by
preventing short cycling.
8. Lifting Bracket Kit:
Kit shall provide attachment points for rigging
straps. (Not required with optional base rail or
downflow option applications.)
9. High- and Low-Pressure Switch Kits:
Switches provide additional safety features and
protect the unit from running at unsuitable
pressures.
10. Filter Rack:
Rack provides mounting location for filters when
unit is in downflow application.
11. Crankcase Heater:
Heater warms crankcase oil to reduce refriger-
ant migration(recommended on 208/230-v, single-
phase units in sizes 024-042).
12. Base Rail:
Base rail provides holes for rigging and handling,
and an elevated base for horizontal applications.
13. Downflow Option:
Option provides for vertical ductwork connec-
tions. Unit shall be equipped with base rail.
14. High Altitude Kit:
Kit shall have new burner orifices for use in ap-
plications from 2001 to 5000 feet.
15. Low NO
x
Kit:
Kit shall provide low NO
x
emissions for units be-
ing installed in California Air Quality Manage-
ment Districts which require NO
x
emissions of
40 nanograms/joule or less.
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