Carrier 50HCQA Installation Manual download pdf (Page 68)

Table 24 – Upper and Lower Field Connection Terminal (TB A and TB B) Board Connections (17--28 Size Units)

TERMINAL

BLOCK

TERMINAL

LABEL

DISPLAY

NAME*

DESCRIPTION

SENSOR

LOCATION

TYPE OF I/O

TERMINAL

NUMBER

Upper

(TB A)

C --- 2 Transformer 2 Common 24 VAC common 1,3,4

R --- 2 24 VAC power Transformer 2 24 VAC 13,15,16

SPT+ SPT Space temperature (T55/56) space 10k thermistor 8

S P T --- SPT Space temperature (T55/56) space 10k thermistor 7

SPTO SPTO Space temperature offset (T56) space 10k thermistor 5

FDWN FDWN Fire shutdown switch input supply/return/space 24 VAC input 11

X ALRM Alarm output (normally open) space 24 VAC output 2

G G Thermostat G (Fan) space 24 VAC input 6

W1 W1 Thermostat W1 (1st stage heat) space 24 VAC input 8

W2 W2 Thermostat W2 (2nd stage heat) space 24 VAC input 10

Y1 Y1 Thermostat Y1 (1st stage cool) space 24 VAC input 12

Y2 Y2 Thermostat Y2 (2nd stage cool) space 24 VAC input 14

Lower

(TB B)

RAT RAT Return Air Temperature Sensor return du ct 10k thermistor 1,3

SAT SAT Supply Air Temperature Sensor Blower or duct 10k thermistor 5,7

HUM HUM Humidistat switch input supply/return/space switch input 9

LPWR Analog Sensor Loop power (24vdc) 24 VDC 8

COM Analog sensor common Ground 4

IAQ IAQ Indoor air quality sensor return/space 4 --- 2 0 m A i n p u t 6

SPRH

SP.RH or

OAQ

Relative humidity sensor or

Outdoor air quality sensor

field installed 4 --- 2 0 m A i n p u t 2

RMOC RM.OC Remote occupancy switch field installed 24 VAC input 10

ENTH

ENTH or

IAQ.S

Outdoor enthalpy switch, or

Indoor air quality switch

economizer, or

return/space

24 VAC input 12

R --- 2 24 VAC power Transformer 2 24 VAC 15

C --- 2 Transformer 2 Common 24 VAC common 16

*Point name displayed on the Scrolling Marquee or Navigator.

48/50HC 17--28 Units —

Low Voltage Terminal Boards (TB A and TB B)

There are two terminal boards with 16 terminals each, and oriented

one mounted above the other. The front have screw terminals and

the back have spade connectors. These terminal boards provide a

connection point for the thermostat or space sensor and for most

field--installed accessories. See Table 24.

Communication Interface Board (CIB)

This circuit board provides a field connection point for unit

communications. The Local Equipment Network (LEN) RJ--11

connector allows a handheld Navigator to be plugged in to access

the unit’s menus. The Carrier Comfort Network

(CCN) RJ--11

connector or the CCN screw terminals allow building

communication connections. See Fig. 33.

LEN CCN

CCN

(+) (-)(com) shield

C11508

Fig. 33 -- Communications Interface Board (CIB)

Central Terminal Board (CTB)

This circuit board is a simple trace board that serves as a junction

point between components and the ComfortLink system. It is the

distribution center for transformer 1’s power. The integrated gas

controller (IGC), electric heater control, compressor control, and

unit shutdown all feed through this trace board. See Fig. 34 and

Table 25 for the connections through this board.

C11509

Fig. 34 -- Central Terminal Board (CTB)

ComfortLINK v2.X

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 103 104

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Carrier 50HCQA Installation Manual Page 68

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