Options and accessories
Factory-installed options
Unit with base rail provides holes for rigging and forklifts
as well as an elevated mounting frame that gives additional
structural support for horizontal installations. Ideal for light
commercial applications.
Downflow option unit is shipped from factory configured
for vertical ductwork connection. Unit is equipped with
base rail.
Field-installed accessories
Factory-assembled roof curbs are designed for use on
downflow discharge applications. Heavy gage, galvanized
steel construction provides one-piece support. The curb com-
plies with the standards of the NRCA (National Roofing
Contractors Association). A wood nailing strip is provided
for attaching the roofing to the curb.
25% Open manual outdoor-air damper provides for
minimum outdoor air and is manually adjustable.
Thermostat and subbase provide heating and cooling
unit control. The subbase provides system and fan switch-
ing at the thermostat location.
Carrier electronic programmable thermostats pro-
vide 2-stage heating and 2-stage cooling control with re-
mote communication ability.
Low-ambient kit (Motormaster II device) allows the
use of mechanical cooling down to outdoor ambient tem-
peratures as low as 0° F.
LP conversion kit allows for conversion from natural gas
to liquid propane. Conversion kit involves changing the gas
orifices and adding ceramic baffles to accommodate liquid
propane.
Solid-state Time Guard II device protects compressor
by preventing short cycling.
Crankcase heater warms crankcase oil to reduce refrig-
erant migration and ensure proper compressor lubrication.
(Recommended on 208/230-v single-phase units in sizes
024-042 only).
High- and low-pressure switches provide additional
safety features and protect the unit from running at unsuit-
able pressures.
Filter rack features easy installation, serviceability, and high
filtering performance for vertical applications.
Lifting bracket kit provides attachment points for rigging
straps. The kit is not required when unit is equipped with
an optional base rail or downflow application.
High altitude kit is for use at 2001 to 5000 feet above
sea level. Kit consists of natural gas orifices that compen-
sate for gas heat operation at high altitude.
Low NO
x
kit provides compliance with low NO
x
emissions
requirements for units being installed in California Air Qual-
ity Management Districts, which require NO
x
emissions of
40 nanograms/joule or less.
UNIT WITH OPTIONAL BASE RAIL
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