Variable Frequency Drive (VFD)

The VFD varies the frequency of the AC voltage supplied to the indoor fan. (See Fig. 20 and Table 23.) This causes the variance in the speed of the fan. The commanded fan speed is received by the VFD from the AUX1 board as a 2-10vdc signal.

The AI1 DIP switch must be in the off (or towards “U”) position to properly read the analog signal. There are three jumper wires that must remain installed for proper operation. The VFD is mounted behind the fan housing on the fan sled and the remote keypad is mounted on the front of the fan housing for easy access. The VFD is factory set to the auto mode for unit operation.

48/50PD

 

 

 

 

C09146

 

 

Fig. 20 - Variable Frequency Drive (VFD)

 

Table 23 — VFD Connections

 

 

 

 

 

 

 

DISPLAY NAME

POINT DESCRIPTION

TYPE OF I/O

TERMINAL

TERMINAL

NUMBER

NAME

 

 

 

 

LOW VOLTAGE INPUTS

 

 

 

 

Shielded Cable Ground

Shield

1

SCR

F.SPD

Commanded Fan Speed

2---10vdc

2

AI1*

 

Analog Input 1 Common

Ground

3

AGND

 

Low Voltage Power (jumped to DI1 & DI4)

24v

10

24v

 

Low Voltage Common (jumped to DCOM)

Ground

11

GND

 

Discrete Inputs Common (jumped from GND)

Ground

12

DCOM

 

Discrete Input 1 (jumped from 24v)

Switch Input

13

DI1

 

Discrete Input 4 (jumped from 24v)

Switch Input

16

DI4

 

HIGH VOLTAGE

 

 

 

 

Voltage Leg from IFC---21

Voltage Input

U1

MAINS

 

Voltage Leg from IFC---22

Voltage Input

V1

MAINS

 

Voltage Leg from IFC---23

Voltage Input

W1

MAINS

 

Voltage Leg to IFM---3

Voltage Output

U2

MOTOR

 

Voltage Leg to IFM---2

Voltage Output

V2

MOTOR

 

Voltage Leg to IFM---1

Voltage Output

W2

MOTOR

* Requires the Al1 dip switch to be in in the Off (or towards “U”) position.

53

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Carrier 48/50PD05 manual Variable Frequency Drive VFD

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.