Outdoor Air Temperature Sensor; Support Feet; Thermostatic Expansion Valve (Txv); Time-Delay Relay - Carrier Comfort 24ACB3 Product Data

ACCESSORY DESCRIPTION AND USAGE (LISTED ALPHABETICALLY) (CONT)

9. Outdoor Air Temperature Sensor

Designed for use with Carrier Thermostats listed in this
publication. This device enables the thermostat to display the
outdoor temperature. This device also
is required to enable special thermostat features such as auxiliary
heat lock out.
Usage Guideline:
Suggested for all Carrier thermostats listed in this
publication.

10. Support Feet

Four stick- -on plastic feet that raise the unit 4 in. (101.6 mm) above
the mounting pad. This allows sand, dirt, and other debris to be
flushed from the unit base, minimizing corrosion.
Usage Guideline:
Suggested in the following applications:
Coastal installations.
Windy areas or where debris is normally circulating.
Rooftop installations.
For improved sound ratings.

11. Thermostatic Expansion Valve (TXV)

A modulating flow- -control valve which meters refrigerant liquid
flow rate into the evaporator in response to the superheat of the
refrigerant gas leaving the evaporator.
Kit includes valve, adapter tubes, and external equalizer tube. Hard
shutoff types are available.
NOTE: When using a hard shutoff TXV with single phase
reciprocating compressors, a Compressor Start Assist Capacitor
and Relay is required.
Usage Guideline:
Accessory required to meet ARI rating and system
reliability, where indoor not equipped.
Hard shutoff TXV or LLS required in air conditioner
long line applications.
Required for use on all zoning systems.
12. Time- -Delay Relay
An SPST delay relay which briefly continues operation of indoor
blower motor to provide additional cooling after the compressor
cycles off.
NOTE: Most indoor unit controls include this feature. For those
that do not, use the guideline below.
Usage Guideline:
Accessory required to meet ARI rating, where indoor
not equipped.
13. Winter Start Control
This control is designed to alleviate nuisance opening of the
low- -pressure switch by bypassing it for the first 3 minutes of
operation.
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