Carrier 48/50PG C03-14 Low Voltage Terminal Strip, Low−Voltage Terminal Strip, PM16−28 size units

Low Voltage Terminal Strip	The circuit breakers for the low voltage control transformers,
(TB1 on PG03−16 size and TB2 on PG20−28 and	interface connection for the Carrier Comfort Network (CCN)
	communication, and interface connection for the Local Equipment
PM16−28 size units)
	Network (LEN) communications are also located on the low
This circuit board provides a connection point between the major
	voltage terminal strip.
control boards and a majority of the field-installed accessories. (See
Fig. 43 and Table 26.)

17	14	7	7	J13
J10	J11	RUN TEST	J12
SEPARATION OF CIRCUITS TO EACH 24V TRANSFORMER MUST BE MAINTAINED
		FIRE SHUTDOWN	T55	FAN STATUS
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

8

(+) (COM) (-) SHIELD

CCN

LEN CCN

48HG500382

48/50PG and PM

C07029

Fig. 43 − Low−Voltage Terminal Strip

Table 26 – Field Connection Terminal Strip

TERMINAL LABEL	DISPLAY	POINT DESCRIPTION
	NAME
1		24 VDC Sensor Loop power
2	IAQ	Indoor air quality sensor
3		Air quality & humidity sensor common
4	OAQ or	Outdoor air quality sensor or
	SP.RH	Relative humidity sensor
5	RM.OC	Remote occupancy switch
6		Switch power (ENTH, RM.OC, IAQ.S)
7	ENTH or	Outdoor enthalpy switch, or
	IAQ.S	Indoor air quality switch
8*	EC.CP	Economizer commanded position actu­
		ator (when in digital control)
9		Economizer signal common
10*	EC.AP	Economizer position feedback (when in
		analog control)
R		24 VAC power
Y1	Y1	Thermostat Y1 (1st stage cool)
Y2	Y2	Thermostat Y2 (2nd stage cool)
W1	W1	Thermostat W1 (1st stage heat)
W2	W2	Thermostat W2 (2nd stage heat)
G	G	Thermostat G (Fan)
C		24 VAC common
X	ALRM	Alarm output (normally open)
FIRE SHUTDOWN	FDWN	Fire shutdown switch 24 VAC output
or	or	or
HUMIDISTAT 1*	HUM	Humidistat switch input
FIRE SHUTDOWN	FDWN	Fire shutdown switch input
or	or	or
HUMIDISTAT 2*	HUM	Humidistat switch 24 VAC output
T55	SPT	Space temperature (T55/56)
1-2
T55	SPTO or	Space temperature offset (T56) or
2-3	RAT	Return air temperature
FAN STATUS		NOT USED
1-2
LEN		Local Equipment Network (LEN)
CCN		Carrier Comfort Network (CCN)

* Refer to Third Party Control section for more information

SENSOR	TYPE OF I/O	CONNECTION
LOCATION		PIN NUMBER
	24 VDC output	J10, 17
return/space	4-20 mA input	J10, 16
	Ground	J10, 15
field installed	4-20 mA input	J10, 14
field installed	24 VAC input	J10, 13
	24 VAC output	J10, 11-12
economizer, or	24 VAC input	J10, 9-10
return/space
economizer	2-10 VDC output	J10, 6-8
	Ground	J10, 3-5
economizer	communication	J10, 1-2
	2-10 VDC output
	24 VAC output	J11, 11-14
space	24 VAC input	J11,10
space	24 VAC input	J11, 9
space	24 VAC input	J11, 7-8
space	24 VAC input	J11, 6
space	24 VAC input	J11, 5
	24 VAC output	J11, 2-4
	24 VAC output	J11, 1
supply/return/	switch input	J12, 7
space
supply/return/	switch input	J12, 6
space
space	10k thermistor	J12, 4-5
space or return	10k thermistor	J12, 3-4
		J12, 1-2
	communication	J13, 6-8, 4-5
	communication	J13, 1-3, 4-5

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