
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 |
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Fig. 43 and Table 26.) |
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17 | 14 | 7 | 7 | J13 |
J10 | J11 | RUN TEST | J12 |
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SEPARATION OF CIRCUITS TO EACH 24V TRANSFORMER MUST BE MAINTAINED |
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| 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)
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 | |||
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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 | ||
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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 | ||
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8* | EC.CP | Economizer commanded position actu | |
ator (when in digital control) | |||
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9 |
| Economizer signal common | |
10* | EC.AP | Economizer position feedback (when in | |
analog control) | |||
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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) | |
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T55 | SPTO or | Space temperature offset (T56) or | |
RAT | Return air temperature | ||
FAN STATUS |
| NOT USED | |
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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 | ||
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| 24 VDC output | J10, 17 | |
return/space | J10, 16 | ||
| Ground | J10, 15 | |
field installed | J10, 14 | ||
field installed | 24 VAC input | J10, 13 | |
| 24 VAC output | J10, | |
economizer, or | 24 VAC input | J10, | |
return/space | |||
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economizer | J10, | ||
| Ground | J10, | |
economizer | communication | J10, | |
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| 24 VAC output | J11, | |
space | 24 VAC input | J11,10 | |
space | 24 VAC input | J11, 9 | |
space | 24 VAC input | J11, | |
space | 24 VAC input | J11, 6 | |
space | 24 VAC input | J11, 5 | |
| 24 VAC output | J11, | |
| 24 VAC output | J11, 1 | |
supply/return/ | switch input | J12, 7 | |
space | |||
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supply/return/ | switch input | J12, 6 | |
space | |||
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space | 10k thermistor | J12, | |
space or return | 10k thermistor | J12, | |
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| J12, | |
| communication | J13, | |
| communication | J13, |
76