80
Low Voltage Terminal Strip
(TB1 on PG03--16 size and TB2 on PG20--28 and
PM16--28 size units)
This circuit board provides a connection point between the major
control boards and a majority of the field-installed accessories. (See
Fig. 48 and Table 26.)
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.
SEPARATION OF CIRCUITS TO EACH 24V TRANSFORMER MUST BE MAINTAINED
1 2 3 4 5 6 7 8 9 10 R Y1 Y2
W1
W2 G C X 1 2 1 2 3 1 2
FAN STATUS
T55
J12
FIRE SHUTDOWN
RUN TEST
J13
7
8
J11
7
14
17
J10
LEN
CCN
CCN
(COM)
SHIELD
(-)
(+)
48HG500382
C07029
Fig. 48 -- Low-- Voltage Terminal Strip
Table 26 – 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 V DC output J10, 17
2 IAQ Indoor air quality sensor return/space 4 --- 20 m A i n p u t 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 --- 2 0 m A i n p u 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 J 10, 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 actu-
ator(whenindigitalcontrol)
economizer 2 --- 10 V D C o u tp u t J10, 6 ---8
9 Economizer signal common Ground J10, 3 ---5
10* EC.AP
Economizer position feedback (when in
analog control)
economizer
communication
2 --- 1 0 V D C o u t p u t
J10, 1---2
R 24 VAC power 24 VAC output J 11, 11---14
Y1 Y1 Thermostat Y1 (1st stage cool) space 24 VAC input J11,10
Y2 Y2 Thermostat Y2 (2nd stage cool) space 24 VAC input J11, 9
W1 W1 Thermostat W1 (1st stage heat) space 24 VAC input J11, 7---8
W2 W2 Thermostat W2 (2nd stage heat) space 24 VAC input J11, 6
G G Thermostat G (Fan) space 24 VAC input 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
or
HUMIDISTAT 1*
FDWN
or
HUM
Fire shutdown switch 24 VAC output
or
Humidistat switch input
supply/return/
space
switch input J12, 7
FIRE SHUTDOWN
or
HUMIDISTAT 2*
FDWN
or
HUM
Fire shutdown switch input
or
Humidistat switch 24 VAC output
supply/return/
space
switch input J12, 6
T55
1 --- 2
SPT Space temperatur e (T55/56) space 10k thermistor J12, 4---5
T55
2 --- 3
SPTO or
RA T
Space temperature offset (T56) or
Return air temperature
space or return 10k th ermistor J12, 3---4
FAN STATUS
1 --- 2
NOT USED J12, 1---2
LEN Local Equipment Network (LEN) communication J 1 3 , 1 --- 3 , 4 --- 5
CCN Carrier Comfort Network (CCN) communication J 1 3 , 6 --- 8 , 4 --- 5
* Refer to Third Party Control section for more information
48/50PG and PM
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