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1
2
3
4
5
6
WHT(GND)
SET
SEN
SW1
BRN (GND)
BLU (SPT)
Cool
Warm
Fig. 76 — T-56 Internal Connections
SEN
SEN
Jumper
SET
SET
Fig. 77 — RTU Open Controller T-56 Sensor
Connections
Connect T-59
The T-59 space sensor requires a separate,
—
isolated power supply of 24 VAC. See Fig. 78 for internal con-
nections at the T-59. Connect the SEN terminal (BLU) to the
RTU Open controller at J20
(BRN) to J20
2. Connect the SET terminal (STO or BLK) to
—
J20
3.
—
RED(+)
CCN COM
BLK(-)
BLK
(T56)
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
J20-1
J20-2
J20-3
1. Connect the COM terminal
—
OR
SET
SEN
OPB
COM- PWR+
NOTE: Must use a separate isolated transformer.
Fig. 78 — Space Temperature Sensor Typical Wiring
INDOOR AIR QUALITY (CO
door air quality sensor accessory monitors space carbon diox-
ide (CO
) levels. This information is used to monitor IAQ lev-
2
els. Several types of sensors are available, for wall mounting in
the space or in return duct, with and without LCD display, and
in combination with space temperature sensors. Sensors use in-
frared technology to measure the levels of CO
space air.
The CO
sensors are all factory set for a range of 0 to 2000
2
ppm and a linear mA output of 4 to 20. Refer to the instructions
supplied with the CO
2
terminal locations. See Fig. 79 for typical CO
schematic.
H G 24 VAC
OR
+ -
24 VDC
2 1
J3
Fig. 79 — Indoor/Outdoor Air Quality (CO
(33ZCSENCO2)
To accurately monitor the quality of the air in the condi-
tioned air space, locate the sensor near a return-air grille (if
present) so it senses the concentration of CO
56
BLK (STO)
J20-3
BRN (COM)
SENSOR
J20-2
WIRING
BLU (SPT)
J20-1
POWER
WIRING
24 VAC
(33ZCT59SPT)
) SENSOR — The
2
present in the
2
sensor for electrical requirements and
sensor wiring
2
+
0-10VDC
-
SIG COM
+
4-20mA
}
NC
COM
NO
8 7 6 5 4 3 2 1
J4
2
Typical Wiring Diagram
—
leaving the space.
2
in-
ALARM
RELAY
CONTACTS
) Sensor
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