Carrier 25HBA3 User Manual download pdf (Page 8)

Accessory Description and Usage (Listed Alphabetically) -- CONTINUED

10. 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.

11. Outdoor Thermostat

An SPDT temperature--actuated switch which turns on

supplemental electric heaters when outdoor air temperature drops

below a user--selected set point.

Usage Guideline:

Electric supplemental heat applications in non--variable

speed indoor units when electric heat staging is desired.

12. Secondary Outdoor Thermostat

An SPDT temperature--actuated switch which turns on

third-- stage of supplemental electric heaters when outdoor air

temperature drops below the second-- stage set point.

Usage Guideline:

Outdoor thermostat applications where electric heater is

capable of 3--stage operation.

13. Sound Hood

Wraparound sound reducing cover for the compressor. Reduces

the sound level by about 2 dBA.

Usage Guideline:

Suggested when unit is installed closer than 15 ft. to

quiet areas, bedrooms, etc.

Suggested when unit is installed between two houses less

than 10 ft. apart.

14. Thermostatic Expansion Valve (TXV) Bi--Flow

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.

Usage Guideline:

Accessory required to meet ARI rating and system

reliability, where indoor not equipped.

Required in all heat pump applications designed with

Puron refrigerant.

15. 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.

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Carrier 25HBA3 User Manual Page 8

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