48/50PD05,06

Single Package Displacement Ventilation

or Single Zone Variable Airflow Rooftop Units Electric Cooling/Gas Heating with PURONR (R-410A) Refrigerant and COMFORTLinkt 1.x Controls

Controls, Start-Up, Operation, Service and

Troubleshooting Instructions

TABLE OF CONTENTS

 

Alarm Output

11

 

Page

Economizer Monitoring

11

SAFETY CONSIDERATIONS

. . 2

Economizer Damper Control

11

GENERAL

. . 3

CONTROLS OPERATION

11

BASIC CONTROL USAGE

. . 3

Display Configuration

11

ComfortLinkt Control

. . 3

Modes

12

Scrolling Marquee

. . 3

Unit Configuration

12

Accessory Navigator Display

. . 3

General Operating Sequence

13

Operation

. . 3

Occupancy Determination

13

System Pilott Device

. . 4

Compressor Operation

14

CCN Tables and Display

. . 4

Indoor Fan Operation

14

Conventions Used in This Manual

. . 5

Outdoor Fan Operation

15

START-UP

. . 5

Economizer Operation

15

Unit Preparation

. . 5

Indoor Air Quality (IAQ)

16

Compressor Mounting

. . 5

Cooling Modes

17

Refrigerant Service Ports

. . 5

Heating Modes

20

Crankcase Heater(s)

. . 5

Temperature Compensated Start

22

Compressor Rotation

. . 5

Carrier Comfort Network (CCN)R Configuration

23

Power Supply

. . 6

Demand Limit

23

Internal Wiring

. . 6

Alarm Handling

24

Evaporator Fan

. . 6

TROUBLESHOOTING

24

Condenser Fans and Motors

. . 6

Complete Unit Stoppage

24

Return-Air Filters

. . 6

Restart Procedure

24

Outdoor-Air Inlet Screens

. . 6

Control Module Communication

24

Accessory Installation

. . 7

Communication Failures

25

Orifice Change (48PD Only)

. . 7

Alarms and Alerts

25

Gas Heat (48PD Only)

. . 7

Cooling Troubleshooting

30

CONTROLS QUICK SET-UP

. . 7

Digital Scroll Controller (DSC) Troubleshooting

31

Control Set Point and Configuration Log

. . 7

Economizer Troubleshooting

33

Standard Unit Control

. . 7

Heating Troubleshooting

34

CCN Communication

. . 8

Variable Frequency Drive (VFD) Troubleshooting

34

Accessories

. . 8

Phase Loss Protection

34

Programming Operating Schedules

. 10

Thermistor Troubleshooting

37

SERVICE TEST

. 10

Transducer Troubleshooting

38

Independent Outputs

. 10

Forcing Inputs and Outputs

38

Fan Test

. 10

MAJOR SYSTEM COMPONENTS

42

Cooling Test

. 11

General

42

Heating Test

. 11

Main Base Board (MBB)

47

THIRD PARTY CONTROL

. 11

Economizer Control Board (ECB)

49

Remote Occupancy

. 11

Modulation Board (AUX1)

51

Fire Shutdown

. 11

Digital Scroll Control Board (DSC)

52

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Carrier 48/50PD05 manual Table of Contents

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.