Carrier 48/50PM C16-28 - Manual (Page 76)

76
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. 43 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. 43 − 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 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
SP.RH Outdoor air quality sensor or
Relative humidity sensor
field installed 4-20 mA input J10, 14
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
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 (when in digital control)
economizer 2-10 VDC output 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 VDC output
J10, 1-2
R 24 VAC power 24 VAC output J11, 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 temperature (T55/56) space 10k thermistor J12, 4-5
T55
2-3
SPTO or
RAT Space temperature offset (T56) or
Return air temperature
space or return 10k thermistor J12, 3-4
FAN STATUS
1-2
NOT USED J12, 1-2
LEN Local Equipment Network (LEN) communication J13, 6-8, 4-5
CCN Carrier Comfort Network (CCN) communication J13, 1-3, 4-5
* Refer to Third Party Control section for more information
48/50PG and PM