Low Voltage Terminal Strip

(TB1)

This circuit board provides a connection point between the major control boards and a majority of the field-installed accessories. (See

Fig. 22 and Table 25.) The circuit breakers for the low voltage control transformers, interface connection for the Carrier Comfort Network→ (CCN) communication, and interface connection for the Local Equipment Network (LEN) communications are also located on the low voltage terminal strip.

 

 

 

 

 

 

C08660

 

 

Fig. 22 - Low-Voltage Terminal Board (LVTB)

 

 

 

 

 

Table 25 — Field Connection Terminal Strip

 

 

 

 

 

 

 

 

 

TERMINAL

DISPLAY

POINT DESCRIPTION

SENSOR

TYPE OF I/O

CONNECTION

LABEL

NAME

LOCATION

PIN NUMBER

 

 

1

 

24 VDC Sensor Loop power

 

24 VDC output

J10, 17

2

IAQ

Indoor air quality sensor

return/space

4---20 mA input

J10, 16

3

 

Air quality & humidity sensor common

 

Ground

J10, 15

4

OAQ or

Outdoor air quality sensor or

field installed

4---20 mA input

J10, 14

SP.RH

Relative humidity sensor

 

 

 

 

 

5

RM.OC

Remote occupancy switch

field installed

24 VAC input

J10, 13

6

 

Switch power (ENTH, RM.OC, IAQ.S)

 

24 VAC output

J10, 11---

12

7

ENTH or

Outdoor enthalpy switch, or

economizer, or

24 VAC input

J10, 9---10

IAQ.S

Indoor air quality switch

return/space

 

 

 

 

8*

EC.CP

Economizer commanded position

economizer

2---10 VDC output

J10, 6---

8

actuator (when in digital control)

 

 

 

 

 

 

9

 

Economizer signal common

 

Ground

J10, 3---

5

10*

EC.AP

Economizer position feedback (when

economizer

communication

J10, 1---

2

in analog control)

2---10 VDC output

 

 

 

 

 

R

 

24 VAC power

 

24 VAC output

J11, 11---

14

Y1

 

NOT USED

 

 

J11,10

 

Y2

 

NOT USED

 

 

J11, 9

 

W1

 

NOT USED

 

 

J11, 7---

8

W2

HUM

Space Humidity Switch

space

24 VAC input

J11, 6

 

G

 

NOT USED

 

 

J11, 5

 

C

 

24 VAC common

 

24 VAC output

J11, 2---

4

X

ALRM

Alarm output (normally open)

 

24 VAC output

J11, 1

 

FIRE

 

 

 

 

 

 

SHUTDOWN

FDWN

Fire shutdown switch 24 VAC output

supply/return

switch input

J12, 7

 

1

 

 

 

 

 

 

FIRE

 

 

 

 

 

 

SHUTDOWN

FDWN

Fire shutdown switch input

supply/return

switch input

J12, 6

 

2

 

 

 

 

 

 

T55

SPT

Space temperature (T55/56)

space

10k thermistor

J12, 4---

5

1---2

 

 

 

 

 

 

T55

SPTO

Space temperature offset (T56)

space

10k thermistor

J12, 3---

4

2---3

 

 

 

 

 

 

FAN STATUS

 

NOT USED

 

 

J12, 1---

2

1---2

 

 

 

 

 

 

 

 

 

LEN

 

Local Equipment Network (LEN)

 

communication

J13, 1---3, 4---5

CCN

 

Carrier Comfort Network (CCN)

 

communication

J13, 6---8, 4---5

* Refer to Third Party Control section for more information

48/50PD

55

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Image 55
Carrier 48/50PD05 manual Low Voltage Terminal Strip, TB1
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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.
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