Carrier 50PD05 Operating And Service Instructions page 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.
17 I I4 I I
J10 J11 RUN TEST
SEPARATION OFCIRCUITSTO EACH 24V TRANSFORMER M USTBEMAiNTAiNED
1 2 3 4 5 6 7 8 9 10 R Y1 Y2 W1 W2 G C X
Fig. 22 - Low-Voltage Terminal Board (LVTB)
Table 25 -- Field Connection Terminal Strip
TERMINAL DISPLAY SENSOR CONNECTION
LABEL NAME POINT DESCRIPTION LOCATION TYPE OF I/O PIN NUMBER
1 24 VDC Sensor Loop power 24 VDC output JlO, 17
2 IAQ Indoor air quality sensor return/space 4-20 mA input J1O, 16
3 Air quality & humidity sensor common Ground J1O, 15
OAQ or Outdoor air quality sensor or
4 SP.RH Relative humidity sensor field installed 4-20 mA input J1O, 14
5 RM.OC Remote occupancy switch field installed 24 VAC input J1O, 16
6 Switch power (ENTH, RM.OC, IAQ.S) 24 VAC output JlO, 11-12
ENTH or Outdoor enthalpy switch, or economizer, or
7 IAQ.S Indoor air quality switch return/space 24 VAC input J1 O, 9-10
Economizer commanded position
8* EC.CP economizer 2-10 VDC output J1O, 6-8
actuator (when in digital control)
9 Economizer signal common Ground J1O, 3-5
10" EC.AP Economizer position feedback (when economizer communication JlO, 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 Jll, 9
Wl NOT USED Jll, 7-8
W2 HUM Space Humidity Switch space 24 VAC input J11,6
G NOT USED Jll, 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 temperatu re (T55/56) space 1Ok thermistor J12, 4- 5
1-2
T55
SPTO Space temperatu re offset (T56) space 1Ok thermistor J12, 3- 4
2-3
FAN STATUS
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
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