Compressors

All compressors are factory shipped with a normal charge of the correct type refrigerant grade oil. No field lubrication is necessary except possibly with repair or replacement of refrigerant circuit components.

Condenser Fan

!WARNING

PERSONAL INJURY HAZARD

Failure to follow this warning could result in personal injury or death.

Do not poke sticks, screwdrivers, or other object into revolving fan blades.

The fan must be kept free of all obstructions to ensure proper cooling. Contact your dealer for any required service.

Electrical Controls and Wiring

Electrical controls are difficult to check without proper instrumentation; therefore, if there are any discrepancies in the operating cycle, contact your dealer and request service.

Unit Panels

After performing any maintenance or service on the unit, be sure all panels are securely fastened in place to prevent rain from entering unit cabinet and to prevent disruption of the correct unit airflow pattern.

REGULAR DEALER MAINTENANCE

In addition to the type of routine maintenance you might be willing to perform, your unit should be inspected regularly by a properly trained service technician. An inspection (preferably each year, but at least every other year) should include the following:

1.Inspection of all flue product passages - including the burners, combustion baffles, heat exchanger, flue collector box, and vent pipe.

2.Inspection of all combustion-air and ventilation-air passages and openings.

3.Close inspection of all gas pipes leading to and inside your unit.

4.Inspection, and if required, cleaning of the condenser and evaporator coils.

5.Inspection, and if required, cleaning of the evaporator drain pan.

6.Inspection, cleaning, and lubrication of blower wheel housing and motor.

7.Inspection of all supply-air and return-air ducts for leaks, obstructions, and insulation integrity. Any problems found should be resolved at this time.

8.Inspection of the unit base to ensure that no cracks, gaps, etc., exist which may cause a hazardous condition.

9.Inspection of the unit casing for signs of deterioration.

10.Inspection of all electrical wiring and components to assure proper connection.

11.Inspection for leaks in the refrigerant circuit. Pressure-check to determine appropriate refrigerant charge

12.Operational check of the unit to determine working conditions. Repair or adjustment should be made at this time.

13.Your servicing dealer may offer an economical service contract that covers seasonal inspections. Ask for further details.

Complete Service Instructions can be found in the unit Installation, Start-Up and Service Instructions.

BEFORE YOU CALL FOR SERVICE,

CHECK FOR SEVERAL EASILY SOLVED

PROBLEMS

If insufficient heating or cooling is suspected:

( )Check for sufficient airflow. Check the air filter for dirt. Check for blocked return-air or supply-air grilles. Be sure they are open and unobstructed. If these checks do not reveal the cause, call your servicing dealer.

If your unit is not operating at all, check the following list for easy solutions:

( ) If using a thermostat, check to be sure that your thermostat temperature selector is set above the indoor temperature during the heating season, or below the indoor temperature during the cooling season. Be sure the SYSTEM switch in the proper HEAT or COOL position and not in the OFF position.

( ) If ComfortLink™ controls are used, check Scrolling Marquee to be sure unit is not in SERVICE TEST mode. Check that set points are properly configured.

(

) If the alarm light is on, check what alarms are active and/or

notify the dealer.

(

) Is the electrical supply switch on? Are any fuses blown, or has

the circuit breaker tripped?

(

) During the heating season, check the manual gas shutoff valve.

Is this lever parallel with the pipe, indicating that the valve is open? Or is the lever at the right angle, indicating that the valve is closed? If closed, has the gas been shut off for safety reasons? Otherwise, you may open the valve and follow the start-up procedures listed in this manual.

NOTE: Before proceeding with the next check, turn off the electrical power supply to the unit.

( ) During the heating season, check the control dial on the gas valve. Is it in the ON position? If it is not, be sure it has not been turned off for the purpose of safety. If nothing else is incorrect, follow the start-up procedures in this manual.

( ) If your unit still fails to operate, call your servicing dealer for troubleshooting and repairs. Specify the model and serial numbers of your unit. (Record them in this manual in the space provided.) If the dealer knows exactly which unit you have, he may be able to offer suggestions over the phone, or save valuable time through knowledgeable preparation for the service call.

IN CASE OF TROUBLE

If, after performing the above, unit performance is unsatisfactory, shut off the unit and call your dealer.

Dealer’s Name:

Telephone No.: Unit Model:

Unit Serial Number:

48PD, 48PG

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Carrier 06, 48PD05 manual Regular Dealer Maintenance, Case of Trouble
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48PD05, 06 specifications

The Carrier 48PD05 and 48PD06 are highly efficient packaged rooftop units designed specifically for commercial applications. They are known for their reliability, advanced technologies, and exceptional performance in diverse weather conditions. Both units leverage Carrier's decades of experience in HVAC technology to deliver optimal indoor comfort with minimal energy consumption.

One of the standout features of the 48PD series is their advanced cooling capabilities. These units utilize scroll compressors, which are renowned for their efficiency and quiet operation. This results in reduced noise levels, making them suitable for a variety of commercial environments, including restaurants, offices, and retail spaces. The units also come equipped with multiple cooling capacities, allowing for precise matching to the specific thermal requirements of the building.

Energy efficiency is a key characteristic of the 48PD05 and 48PD06. Both units feature high SEER (Seasonal Energy Efficiency Ratio) ratings, ensuring that they consume less electricity while delivering superior cooling performance. The use of microchannel coil technology further enhances efficiency. This innovation reduces refrigerant charge requirements and improves heat transfer, allowing the units to operate effectively in various climatic conditions.

In addition to cooling, these units also provide heating functionality, making them an all-in-one solution for year-round climate control. They incorporate electric heating elements as well as optional gas heat capabilities, providing flexibility based on user preference and fuel availability. This versatility ensures that facilities can maintain comfort regardless of seasonal changes.

The Carrier 48PD series is also designed with ease of installation and maintenance in mind. The compact rooftop design allows for straightforward placement on a building’s roof, reducing installation costs and time. Furthermore, serviceability is enhanced through features like removable access panels, which provide easy access to critical components.

Safety and reliability are paramount in Carrier's design philosophy. Both units include a variety of safety features such as high-pressure and low-pressure switches, ensuring the longevity and protection of the system. Additionally, the intelligent controls available with the 48PD models facilitate precise temperature management, enhancing occupant comfort while optimizing energy use.

In conclusion, the Carrier 48PD05 and 48PD06 packaged rooftop units stand out due to their efficient cooling and heating capabilities, innovative technologies, and user-friendly design. Their combination of performance, energy efficiency, and advanced features makes them a reliable choice for commercial heating and cooling needs, assuring users of comfort and cost-effectiveness throughout their operation.
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