Carrier 25HBB installation instructions Install Electrical Accessories, Start-Up

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Install Electrical Accessories

Refer to the individual instructions packaged with kits or accessories when installing.

Start-Up

!CAUTION

PERSONAL INJURY HAZARD

Failure to follow this caution may result in personal injury.

Wear safety glasses, protective clothing, and gloves when handling refrigerant and observe the following:

S Front seating service valves are equipped with Schrader valves.

!CAUTION

ENVIRONMENTAL HAZARD

Failure to follow this caution may result in environmental damage.

Federal regulations require that you do not vent refrigerant to the atmosphere. Recover during system repair or final unit disposal.

!CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in personal injury, equipment damage or improper operation.

S Do not overcharge system with refrigerant.

S Do not operate unit in a vacuum or at negative pressure. S Do not disable low pressure switch in scroll compressor

applications.

S Compressor dome temperatures may be hot.

Follow these steps to properly start up system:

1.After system is evacuated, fully open liquid and vapor service valves.

2.Unit is shipped with valve stem(s) front seated (closed) and caps installed. Replace stem caps after system is opened to refrigerant flow (back seated). Replace caps finger-tight and tighten with wrench an additional 1/12 turn.

3.Close electrical disconnects to energize system.

4.Set room thermostat at desired temperature. Be sure set point is below indoor ambient temperature.

5.Set room thermostat to HEAT or COOL and fan control to ON or AUTO mode, as desired. Operate unit for 15 minutes. Check system refrigerant charge.

 

 

TYPICAL

 

HEAT

HP THERMOSTAT

FAN COIL

 

PUMP

24 VAC HOT

R

R

 

R

24 VAC COM

C

C

 

C

 

 

HEAT STAGE 2

W2

W2

*

W2

 

 

E *

COOL/HEAT

Y

 

STAGE 1

W3 *

Y

 

 

 

 

INDOOR FAN

G

G

 

 

 

 

 

 

RVS COOLING

O

 

 

O

EMERGENCY

E

* IF AVAILABLE

 

HEAT

 

 

LEGEND

24-V FACTORY WIRING

24-V FIELD WIRING

FIELD SPLICE CONNECTION

ODT

OUTDOOR THERMOSTAT

EHR EMERGENCY HEAT RELAY

SHR SUPPLEMENTAL HEAT RELAY

A02325 / A97413

Fig. 8 - Generic Wiring Diagrams

(See Thermostat Installation Instructions for specific unit com-

binations)

Sequence of Operation

Turn on power to indoor and outdoor units. Transformer is energized.

Cooling

On a call for cooling, thermostat makes circuits R-O and R-Y, and R-G. Circuit R-O energizes reversing valve, switching it to cooling position. Circuit R-Y energizes contactor, starting outdoor fan motor and compressor circuit. R-G energizes indoor unit blower relay, starting indoor blower motor on high speed.

When thermostat is satisfied, its contacts open, de-energizing contactor and blower relay. Compressor and motors should stop.

NOTE: If indoor unit is equipped with a time-delay relay circuit, the indoor blower will run an additional 90 seconds to increase system efficiency.

Heating

On a call for heating, thermostat makes circuits R-Y and R-G. Circuit R-Y energizes contactor, starting outdoor fan motor and compressor. Circuit R-G energizes indoor blower relay, starting blower motor on high speed.

Should temperature continue to fall, R-W2 is made through second-stage room thermostat. Circuit R-W2 energizes a relay, bringing on first bank of supplemental electric heat and providing electrical potential to second heater relay (if used). If outdoor temperature falls below setting of outdoor thermostat (field installed option), contacts close to complete circuit and bring on second bank of supplemental electric heat.

When thermostat is satisfied, its contacts open, de-energizing contactor and relay. All heaters and motors should stop.

Defrost

The defrost control is a time/temperature control which includes a field selectable (quick-connects located at board edge) time period between defrost cycles (30, 60, or 90 minutes), factory set to 90 minutes.

25HBB

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Contents Electrical Shock Hazard Safety ConsiderationsInstallation Recommendations Check Equipment and Job Site Install on a Solid, Level Mounting PadClearance Requirements Operating AmbientAccessory Usage Install Liquid Line Filter Drier IndoorOutdoor Unit Connected To Factory Approved Indoor Unit Refrigerant Tubing and Sweat ConnectionsCompressor Crankcase Heater Make Electrical ConnectionsStart-Up Install Electrical AccessoriesCare and Maintenance Heating Check Chart ProcedureCheck Charge Final ChecksPuronr R-410A Quick Reference Guide Catalog No 25HBB---1SI

25HBB specifications

The Carrier 25HBB is a highly regarded air conditioning unit that embodies advanced technology and efficient performance, appealing to residential and commercial users alike. This model is part of Carrier's extensive range of HVAC systems, known for its quality and reliability.

One of the standout features of the 25HBB is its energy efficiency. Equipped with a high SEER (Seasonal Energy Efficiency Ratio) rating, this model efficiently cools spaces while reducing energy consumption. This characteristic not only lowers utility bills but also minimizes the unit's carbon footprint, making it an environmentally friendly choice.

The 25HBB is powered by a unique inverter technology, allowing the compressor to adjust its speed based on the cooling demand. This adaptability results in stable temperatures throughout the environment, enhanced comfort levels, and significant energy savings. Additionally, the variable-speed operation limits noise levels, making it an ideal solution for residential areas or environments where quiet operation is a priority.

Another remarkable characteristic is its robust construction and durability. Carrier has incorporated high-quality materials and components, ensuring that the 25HBB can withstand varying weather conditions while maintaining superior performance. The unit is designed to operate quietly and efficiently, with features like a sound-dampening compressor and insulated cabinet.

User-friendly controls are a highlight of the 25HBB, as it comes equipped with a programmable thermostat that allows for customized temperature settings. This feature enables users to prioritize comfort while maximizing energy efficiency. Many units in this model range also support smart technology integration, allowing users to control their HVAC systems remotely via smartphone applications.

The Carrier 25HBB is available in various capacities, catering to different space requirements and preferences. It also features a range of advanced filtration systems to improve indoor air quality, capturing dust, allergens, and other particulates. Regular maintenance of the unit is facilitated by easy access to components, ensuring long-lasting performance.

In summary, the Carrier 25HBB stands out for its energy efficiency, advanced inverter technology, durability, and user-friendly features. These characteristics make it an exceptional choice for anyone looking for a reliable and efficient air conditioning solution. Whether for a residential or commercial application, the 25HBB exemplifies Carrier’s commitment to innovation and customer satisfaction.
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