Accessory Control Components - Carrier 48AJ Operating And Service Manual

FIELD CONNECTION TERMINAL STRIPS — Field con-
nection terminal strips are located in the main control box. See
Fig. 28 and Table 113.
Accessory Control Components —
the factory-installed options, the units can also be equipped
with several field-installed accessories that expand the control
features of the unit. The following hardware components can
be used as accessories.
ROOM THERMOSTATS (48/50AJ,AW ONLY) — The
ComfortLink™ controls support a conventional electro-
mechanical or electronic thermostat that uses the Y1, Y2, W1,
W2, and G signals. The control also supports an additional
input for an occupied/unoccupied command that is available on
some new thermostats. The ComfortLink control can be
configured to run with multiple stages of capacity which allows
up to 6 stages of capacity. Although the unit can be configured
TB3
LEN
R Y1 Y2 W1 W2 G
TB4
1 2
A48-7081
3
2
1
J5
OVERRIDE
B4
Fig. 29 — CO
In addition to
+
C - GRD
CCN
CCN
C
3 4 5 6 7
Fig. 28 — Field Connection Terminal Strips (Main Control Box)
2 3
1
J4
J3
J6
and Space Temperature Sensor Wiring (33ZCT55CO2 and 33ZCT56CO2)
2
for normal 2-stage control, it is recommended that the multi-
stage control be used. The room thermostat is connected to
TB4.
SPACE SENSOR — The ComfortLink control supports the
use of space temperature sensors. The T55 and T56 sensors
and CCN communicating T58 room sensor can be used. The
T55 and T56 sensors are connected to TB5 terminal 3, 4, and 5.
The T58 sensor is connected to the CCN connections on TB3.
When a T55, T56, or T58 sensor is used, the user must install
the red jumpers from R to W1, and W2 on TB4 for the heat
function to work correctly.
SPACE CO SENSORS — The ComfortLink control also
2
supports a CO IAQ sensor that can be located in the space for
2
use in demand ventilation. The sensor must be a 4 to 20 mA
sensor and should be connected to TB5 terminal 6 and 7. See
Fig. 29 for sensor wiring.
1 3 5
X
2 4 6
8
1 3 5
2 4 6
UNIT CONTROL BOX
114
7 9 11 13 15
8 10 12 14 16
7 9 11 13 15
8 10 12 14 16
TB4
1 2 3 4 5 6
7
TB5
3 4 5 6
1 2 7
A48-7306
TB5
TB6