Bryant 580J*04A, Руководство по установке

Страница: 41 / 52

41
Fig. 48 — T-56 Internal Connections
Fig. 49 — RTU Open T-56 Sensor Connections
Connect T-59 — The T-59 space sensor requires a sep-
arate, isolated power supply of 24 VAC. See Fig. 50 for internal
connections at the T-59. Connect the SEN terminal (BLU) to
RTU Open J20-1. Connect the COM terminal (BRN) to J20-2.
Connect the SET terminal (STO or BLK) to J20-3.
Fig. 50 — Space Temperature Sensor Typical Wiring
(33ZCT59SPT)
Indoor Air Quality (CO
2
) Sensor — The indoor air quality
sensor accessory monitors space carbon dioxide (CO
2
) levels.
This information is used to monitor IAQ levels. Several types
of sensors are available, for wall mounting in the space or in re-
turn duct, with and without LCD display, and in combination
with space temperature sensors. Sensors use infrared technolo-
gy to measure the levels of CO
2
present in the space air.
The CO
2
sensors are all factory set for a range of 0 to 2000
ppm and a linear mA output of 4 to 20. Refer to the instructions
supplied with the CO
2
sensor for electrical requirements and
terminal locations. See Fig. 51 for typical CO
2
sensor wiring
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
2
leaving the
space. The sensor should be mounted in a location to avoid di-
rect 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.
Fig. 51 — Indoor/Outdoor Air Quality (CO
2
) Sensor
(33ZCSENCO2) — 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 RTU Open J4-2 and
connect the SIG COM terminal to RTU Open J4-3. See Fig. 52.
Fig. 52 — RTU Open/Indoor CO
2
Sensor
(33ZCSENCO2) Connections
2
3 4 5
6 1
S W1
S EN
S ET
Cool Warm
BRN (GND)
BLU ( S PT)
RED(+)
WHT(GND)
BLK(-)
CCN COM
S EN S OR WIRING
JUMPER
TERMINAL
S
A S S HOWN
BLK
(T56)
S EN J20-1
J20-2
S EN
S ET
J u mper
J20- 3 S ET
OR SET SEN
OPB COM- PWR+
BLU (SPT)
BLK (STO)
24 VAC
SENSOR
WIRING
POWER
WIRING
BRN (COM)
NOTE: Must use a separate isolated transformer.
J20-3
J20-2
J20-1
8 7 6 5 4 3 2 1 2 1
H G 24 VAC
OR
24 VDC
NC ALARM
RELAY
CONTACT
S
COM
NO
}
0-10VDC
S IG COM
4-20mA
+
+
-
+ -
J 3 J4
S EN
COM
J4-2
J4- 3
IAQ S en s or
24 VAC