48/50PD

Table 8 — ComfortLinkAlarm Codes (cont)

 

 

 

 

 

 

ALARM

 

 

 

 

 

OR

 

DESCRIPTION

ACTION TAKEN BY

RESET

PROBABLE CAUSE

ALERT

 

CONTROL

METHOD

 

 

 

NUMBER

 

 

 

 

T178

 

Loss of Communication with the Capacity

Unit shutdown ---HVAC

Automatic

Communication wiring problem with AUX1 or faulty

 

Control Board

disable

MBB, ECB, or AUX1

 

 

 

 

T179

 

Loss of communication with the Economizer

No economizer

Automatic

Communication wiring problem with ECB or faulty

 

Control Board

operation

MBB, ECB, or AUX1

 

 

 

 

T180

 

Loss of communication with the Economizer

No economizer

Automatic

Communication wiring problem with actuator.

 

Actuator

operation

 

 

 

 

 

A200

 

Linkage Timeout Error --- Comm Failure

No Linkage Operation

Automatic

Received a table write from Linkage before, now not

 

fall back to local SPT

receiving any linked commands

 

 

 

 

 

A404

 

Fire Shutdown

Unit Shutdown

Automatic

Smoke detected by smoke detector

T408

 

Dirty Filter

Alert Generated

Automatic

Dirty Filter

 

 

 

 

 

If IDF.F =

 

 

 

 

 

If IDF.F = Yes, then Unit

YES, then

 

 

 

 

Fan Status Switch ON, Fan Contactor OFF

Manual,

Bad Fan Status Switch. Configuration incorrect.

 

 

 

Shutdown

 

 

 

 

otherwise

 

 

 

 

 

 

 

T409

 

 

 

automatic

 

 

 

 

If IDF.F =

 

 

 

 

 

 

 

 

 

 

 

If IDF.F = Yes, then Unit

YES, then

Tripped Circuit Breaker. Broken belt. Bad indoor fan

 

 

 

Fan Status Switch OFF, Fan Contactor ON

Manual,

 

 

 

Shutdown

motor. Configuration incorrect. Bad fan status switch.

 

 

 

 

otherwise

 

 

 

 

 

 

 

 

 

 

 

automatic

 

 

 

 

Economizer Damper Actuator Out of

Alert Generated

Automatic

Calibrate economizer (E.CAL). If problem still exist

 

 

 

Calibration

then determine what is limiting economizer rotation.

 

 

 

 

 

 

 

 

Economizer Damper Actuator Torque Above

Alert Generated

Automatic

Actuator load too high. Check damper load.

 

 

 

Load Limit

 

 

 

 

 

 

 

 

 

Economizer Damper Actuator Hunting

Alert Generated

Automatic

Damper position changing too quickly.

T414

 

Excessively

 

 

 

 

 

Economizer Damper Stuck or Jammed

Alert Generated

Automatic

No economizer motion. Check damper blades, gears,

 

 

 

 

 

 

and actuator.

 

 

 

 

 

 

 

 

 

Economizer Damper Actuator Mechanical

Alert Generated

Automatic

Check actuator and replace if necessary.

 

 

 

Failure

 

 

 

 

 

 

 

 

 

Economizer Damper Actuator Direction

Alert Generated

Automatic

Actuator direction control switch (CCW, CW) wrong.

 

 

 

Switch Wrong

 

 

 

 

 

 

T415

 

IAQ Input Out of Range

No IAQ Operations

Automatic

Bad sensor, bad wiring, or sensor configured

 

incorrectly.

 

 

 

 

 

 

T416

 

OAQ Input Out of Range

No OAQ Operations

Automatic

Bad sensor, bad wiring, or sensor configured

 

incorrectly.

 

 

 

 

 

 

LEGEND

 

 

 

 

 

ECB

-

Economizer Control Board

 

 

 

IGC

-

Integrated Gas Controller

 

 

 

MBB -

Main Base Board

 

 

 

OAT

-

Outdoor-Air Thermistor

 

 

 

Cooling Troubleshooting

Use the Scrolling Marquee display or a CCN device to view the cooling status display and the cooling diagnostic display (see Appendix A) for information on the cooling operation. Check the current alarms and alarm history for any cooling alarm codes and correct any causes. (See Table 9.)

Verify any unique control configurations per installed site requirements or accessories. If alarms conditions are corrected and cleared, operation of the compressors and fans may be verified by using the Service Test mode. (See Table 5.) See Table 9 for general cooling service analysis.

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Carrier 48/50PD05 manual Cooling Troubleshooting

48/50PD05 specifications

The Carrier 48/50PD05 is a remarkable addition to Carrier's lineup of rooftop units, offering advanced cooling and heating solutions for commercial applications. Designed for medium-sized buildings, this unit is well-suited for both new installations and as a replacement for older systems, thanks to its versatile features and efficient performance.

One of the standout features of the 48/50PD05 is its energy efficiency. It incorporates state-of-the-art technology to achieve high Seasonal Energy Efficiency Ratios (SEER) and EER ratings, reducing operational costs while delivering superior comfort. The unit is also compliant with the latest energy regulations, making it an environmentally friendly choice for building owners concerned about sustainability.

The 48/50PD05 is equipped with a highly efficient scroll compressor, which not only enhances performance but also contributes to quiet operation. This is a significant advantage in commercial spaces where noise levels need to be kept in check for comfort and productivity. Additionally, the unit includes advanced airflow design, ensuring even distribution of conditioned air throughout the space.

Technologically, the Carrier 48/50PD05 features Carrier's Infinity Control system, which allows for precise control of indoor climate. This intelligent control mechanism can be integrated with smart building management systems, enabling users to monitor and manage energy use effectively. Wi-Fi connectivity is also available, providing remote access for real-time adjustments and diagnostics.

Durability is another characteristic of the 48/50PD05. Constructed with high-quality materials, the unit withstands various environmental conditions, ensuring longevity and reliability. Moreover, the modular design facilitates easy maintenance, making service procedures efficient and cost-effective.

In addition to cooling, the Carrier 48/50PD05 offers heating capabilities, often utilizing gas or electric heating options that can be tailored to the specific needs of a building. The unit can also be equipped with integrated economizers, allowing for free cooling during suitable outdoor conditions, further enhancing energy savings.

Overall, the Carrier 48/50PD05 stands out as a high-performance HVAC solution that combines efficiency, technology, and durability. It provides building owners with a versatile tool to ensure comfort while minimizing their environmental footprint. With a strong emphasis on energy savings and advanced control features, this rooftop unit is a smart investment for any commercial property.