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55
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
LABEL
DISPLAY
NAME
POINT DESCRIPTION
SENSOR
LOCATION
TYPE OF I/O
CONNECTION
PIN NUMBER
1 24 VDC Sensor Loop power 24 VDC output J10, 17
2 IAQ Indoor air quality sensor return/space 4 --- 20 m A in put J10, 16
3 Air quality & humidity sensor common Ground J10, 15
4
OAQ or
SP.RH
Outdoor air quality sensor or
Relative humidity sensor
field installed 4 --- 20 mA in pu t J10, 14
5 RM.OC Remote occupancy switch field installed 24 VAC input J10, 13
6 Switchpower(ENTH,RM.OC,IAQ.S) 24 VAC output J10, 11---12
7
ENTH or
IAQ.S
Outdoor enthalpy switch, or
Indoor air quality switch
economizer, or
return/space
24 VAC input J10, 9---10
8* EC.CP
Economizer commanded position
actuator (when in digital control)
economizer 2 --- 10 V DC ou tp ut J10, 6---8
9 Economizer signal common Ground J10, 3---5
10* EC.AP
Economizer position feedback (when
in analog control)
economizer
communication
2 --- 10 V DC ou tp ut
J10, 1---2
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
1
FDWN Fire shutdown switch 24 VAC output supply/return switch input J12, 7
FIRE
SHUTDOWN
2
FDWN Fire shutdown switch input supply/return switch input J12, 6
T55
1 --- 2
SPT Space temperature (T55/56) space 10k thermistor J12, 4---5
T55
2 --- 3
SPTO Space temperature offset (T56) space 10k thermistor J12, 3---4
FAN STATUS
1 --- 2
NOT USED J12, 1---2
LEN Local Equipment Network (LEN) communication J1 3, 1 --- 3 , 4 --- 5
CCN Carrier Comfort Network (CCN) communication J 13, 6 --- 8, 4 --- 5
* Refer to Third Party Control section for more information
48/50PD