Carrier 48PD05, 06 manual To Shut Unit OFF Units with ELECTRO-MECHANICAL Control, Step, Fire Hazard

Page 6

48PD, 48PG

TO SHUT UNIT OFF

(UNITS WITH ELECTRO-MECHANICAL

CONTROL)

!WARNING

FIRE HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Do not turn off the electrical power to unit without first turning off the gas supply. Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the unit before shutting off the electrical supply. Make sure to apply lockout tags.

See Fig. 1. for location of gas valve. Refer to Fig. 4 while proceeding with the following steps:

Step 1 — Set room thermostat to lowest temperature setting and set SYSTEM switch to OFF position.

Step 2 — Close the shutoff valve on the external gas supply piping.

Step 3 — Turn off the electrical power supply to the unit and install lockout tag.

Step 4

— Open the heat section access panel.

Step 5

— Move ON/OFF switch on the internal gas valve to the

OFF position.

Step 6

— Close the heat section access panel.

Step 7

— If unit is being shut down because of a malfunction,

call your dealer as soon as possible.

If unit is being shut down because the heating season has ended, restore electrical power to the unit to ensure operation of the cooling system during the cooling season.

TO SHUT UNIT OFF (UNITS WITH COMFORTLINKt

CONTROL)

!WARNING

FIRE HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Do not turn off the electrical power to unit without first turning off the gas supply. Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the unit before shutting off the electrical supply. Make sure to apply lockout tags.

See Fig. 1. for location of gas valve. Refer to Fig. 5 while proceeding with the following steps:

Step 1 — Turn off the unit operation by using the Scrolling Marquee to put the unit into Service Test mode. The Scrolling Marquee is located on the front of the unit control box behind the control box and compressor access door. (See Fig. 6.) Thermostat inputs and remote network commands are ignored when Service Test mode is ON.

NOTE: A password may be required to change Service Test values, depending on previous settings configured in the unit. Default password is “1111.”

a.Press the ESCAPE key until a blank screen is shown.

b.Use the arrow keys to scroll the red LED on the display to the “Service Test” position and press ENTER.

c.The control will display the Field Service Test Mode (TEST) setting. Press ENTER once to select the TEST setting for configuration. Press ENTER again for “OFF” to begin flashing.

d.Use the arrow keys to change the configuration from “OFF” to “ON,” then press ENTER to save the setting.

Step 2 — Close the shutoff valve on the external gas supply piping.

Step 3 — Turn off the electrical power supply to the unit and install lockout tag.

Step 4

— Open the heat section access panel.

Step 5

— Move ON/OFF switch on the internal gas valve to the

OFF position.

Step 6

— Close the heat section access panel.

Step 7

— If unit is being shut down because of a malfunction,

call your dealer as soon as possible. If unit is being shut down because the heating season has ended, restore electrical power to the unit to ensure operation of the cooling system during the cooling season.

6

Page 5 Page 7
Image 6
Page 5 Page 7
Contents Table of Contents Safety ConsiderationsTo Light Unit Units with ELECTRO-MECHANICAL Control Post Unit Installation InspectionDetermine Type of Unit Control Electro-Mechanical ControlTo Light Unit Typical Gas Heating SectionStep Main To Shut Unit OFF Units with ELECTRO-MECHANICAL Control StepFire Hazard To Shut Unit Off Units with Electro-Mechanical Control To Shut Unit Off Units with ComfortLinkt Control Routine Maintenance and Care For the Equipment Owner Maintaining Your UnitFire and Equipment Damage Hazard Combustion Air and Vent System Alarm Status Units with ComfortLinkt ControlsIntegrated Gas Controller IGC Heat ExchangerRegular Dealer Maintenance Case of TroubleCatalog No 48PDPG---01SO

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.
Top Page Image Contents