67
48/50HC 04--14 Units —
Low Voltage Terminal Board (TB)
The field connection terminal board has 30 terminals oriented in 3
rows of 10 terminals. The front has screw terminals and the back
has spade connectors. This board provides connection fo the
thermostat, space sensor, and most field installed accessories. See
Table 23.
Table 23 – Field Connection Terminal Board (TB) Connections (04--14 Size Units)
TERMINAL
LABEL
DISPLAY
NAME*
DESCRIPTION
SENSOR
LOCATION
TYPE OF I/O
TERMINAL
NUMBER
C --- 2 Transformer 2 Common 24 VAC common 1,2
R --- 2 24 VAC power Transformer 2 24 VAC 9,10
SPT+ SPT Space temperature (T55/56) space 10k thermistor 14
S P T --- SPT Space temperature (T55/56) space 10k thermistor 13
SPTO SPTO Space temperature offset (T56) space 10k thermistor 12
FDWN FDWN Fire shutdown switch input supply/return/space 24 VAC input 30
X ALRM Alarm output (normally open) space 24 VAC output 3
G G Thermostat G (Fan) space 24 VAC input 4
W1 W1 Thermostat W1 (1st stage heat) space 24 VAC input 5
W2 W2 Thermostat W2 (2nd stage heat) space 24 VAC input 6
Y1 Y1 Thermostat Y1 (1st stage cool) space 24 VAC input 7
Y2 Y2 Thermostat Y2 (2nd stage cool) space 24 VAC input 8
RAT RAT Return Air Temperature Sensor return duct 10k thermistor 15,16
SAT SAT Supply Air Temperature Sensor Blower or duct 10k thermis t or 17,18
HUM HUM Humidistat switch input supply/return/space switch input 27
LPWR Analog Sensor Loop power (24vdc) 24 VDC 24
COM Analog sensor common Ground 22
IAQ IAQ Indoor air quality sensor return/space 4 --- 2 0 m A i n p u t 23
SPRH
SP.RH or
OAQ
Relative humidity sensor or
Outdoor air quality sensor
field installed 4 --- 2 0 m A i n p u t 21
RMOC RM.OC Remote occupancy switch field installed 24 VAC input 25
ENTH
ENTH or
IAQ.S
Outdoor enthalpy switch, or
Indoor air quality switch
economizer, or
return/space
24 VAC input 26
Not Used 11,19,20,28,29
*Point name displayed on the Scrolling Marquee or Navigator.
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