Low Voltage Terminal Strip, TB1 | Carrier 48/50PD05 manual

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	POINT DESCRIPTION	LOCATION	TYPE OF I/O	PIN NUMBER
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
4	SP.RH	Relative humidity sensor	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
7	IAQ.S	Indoor air quality switch	return/space	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
8*	EC.CP	actuator (when in digital control)	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
10*	EC.AP	in analog control)	economizer	2---10 VDC output	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	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	SPTO	Space temperature offset (T56)	space	10k thermistor	J12, 3---	4
2---3
FAN STATUS		NOT USED			J12, 1---	2
1---2		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

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.