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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
Summary of Contents for 48/50PG C03-14
Page 31: ...31 C07009 Fig 18 Air Baffle Dimensions 48 50PG03 16 48 50PG and PM...
Page 32: ...32 C08077 Fig 19 Air Baffle Dimensions 48 50PM16 28 48 50PG and PM...
Page 56: ...56 C08549 Fig 25 48PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 57: ...57 C08550 Fig 26 50PG03 16 Control Wiring Schematic 48 50PG and PM...
Page 62: ...62 C08471 Fig 31 Typical 48PM16 28 Control Schematic 48 50PG and PM...
Page 63: ...63 C08062 Fig 32 Typical 48PM16 28 with Humidi MiZert System Control Schematic 48 50PG and PM...
Page 64: ...64 C101251 Fig 33 Typical 50PM16 28 Control Schematic 48 50PG and PM...
Page 65: ...65 C08064 Fig 34 Typical 50PM16 28 with Humidi MiZert Control Schematic 48 50PG and PM...
Page 66: ...66 C10902 Fig 35 Typical 48 50PM16 28 Power Schematic 48 50PG and PM...
Page 67: ...67 C09213 Fig 36 Typical 48 50PM16 28 with Humidi MiZert System Power Schematic 48 50PG and PM...
Page 69: ...69 C08067 Fig 38 48 50PM16 28 Component Arrangement 48 50PG and PM...
Page 70: ...70 C101252 Fig 39 48 50PM16 28 with Humidi MiZert Component Arrangement 48 50PG and PM...