Table of Contents
Advertisement
1
2
3
4
5
SEN
SW1
Cool
Fig. 48 — T-56 Internal Connections
SEN
SEN
Jumper
SET
SET
Fig. 49 — 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. 50 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.
—
BLK (STO)
BRN (COM)
BLU (SPT)
OR
SET
SEN
OPB
COM- PWR+
NOTE: Must use a separate isolated transformer.
Fig. 50 — Space Temperature Sensor Typical Wiring
(33ZCT59SPT)
6
RED(+)
WHT(GND)
CCN COM
BLK(-)
SET
BLK
(T56)
BRN (GND)
SENSOR WIRING
BLU (SPT)
JUMPER
TERMINALS
AS SHOWN
Warm
J20-1
J20-2
J20-3
1. Connect the COM terminal
—
J20-3
SENSOR
J20-2
WIRING
J20-1
POWER
WIRING
24 VAC
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. 51 for typical CO
schematic.
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
The sensor should be mounted in a location to avoid direct
breath contact.
Do not mount the IAQ sensor in drafty areas such as near
supply ducts, open windows, fans, or over heat sources. Allow
at least 3 ft (0.9 m) between the sensor and any corner. Avoid
mounting the sensor where it is influenced by the supply air;
the sensor gives inaccurate readings if the supply air is blown
directly onto the sensor or if the supply air does not have a
chance to mix with the room air before it is drawn into the re-
turn airstream.
To controller
8 7 6 5 4
Fig. 51 — Indoor/Outdoor Air Quality (CO
(33ZCSPTCO2-01 or 33ZCSPTCO2LCD-01) Typical
Wiring Diagram
Wiring the Indoor Air Quality Sensor: For each sensor, use
two 2-conductor 18 AWG (American Wire Gage) twisted-pair
cables (unshielded) to connect the separate isolated 24 vac
power source to the sensor and to connect the sensor to the con-
trol board terminals.
To connect the sensor to the control, identify the positive (4
to 20 mA) and ground (SIG COM) terminals on the sensor. See
Fig. 51. Connect the 4-20 mA terminal to the RTU Open con-
troller at J4-2 and connect the SIG COM terminal to the RTU
Open controller at J4-3. See Fig. 52.
41
) SENSOR — The
2
present in the
2
sensor for electrical requirements and
sensor wiring
2
leaving the space.
2
24 Vac
-
+
Dedicated Transformer
2 1
24 Vac
SENSOR LEGEND
or Vdc
1 +24 Vac/Vdc
2 Gnd (-24 Vac/Vdc)
4 -Thermistor
5 +Thermistor
6 4-20 mA
7 SIG COM
8 0-5 Vdc
) Sensor
2
in-
Line
Advertisement
Table of Contents
