Relay Pack Installation; Wiring Connections; Indoor-Air Quality Sensor Installation; Provide Power To Relay Pack - Carrier 33CS Installation, Service, And Troubleshooting Instructions

Relay Pack Installation —
installed in the HVAC unit control box if climate or space con-
ditions allow. If the temperature range of 32 to 150 F may be
exceeded (at a relative non-condensing humidity of less than
95%), then the relay pack should be installed at another loca-
tion such as a plenum space or utility room.
NOTE: Factory-installed relay packs are available for some
Carrier rooftop units. Refer to the Apollo control installation
instructions for information on the placement of the factory-
installed Apollo control in the rooftop unit.

Wiring Connections

WIRE RELAY PACK TO THERMOSTAT — Wire each ther-
mostat to its respective relay pack as shown in Fig. 3. Wiring
connections should be made at the wiring connector board of
the thermostat.
Electric shock can cause injury or death. Ensure power to
the transformer has been disconnected before wiring.
WIRE RELAY PACK TO HVAC UNIT — Wire the relay
pack to the HVAC unit as shown in Fig. 4 or 5. Refer to Fig. 4
for TEMP System relay packs. Refer to Fig. 5 for TEMP Sys-
tem relay packs with auxiliary relay. All wiring and the relay
pack should be kept a minimum of 12 in. away from any
cables carrying AC current. For more information refer to the
installation instructions included with each relay pack.
WIRE SENSORS TO RELAY PACK — Wire the sensors to
the relay pack. See Fig. 3.
NOTE: Humidity Sensor and Fan Status Switch cannot be
wired to the same relay pack.
Indoor-Air Quality Sensor Installation —
indoor-air quality (IAQ) sensor is designed for use with the
Carrier Comfort system. The sensor has a range of 0 to
5000 ppm of CO . The factory setting is 1000 ppm. This set
2
point is adjustable only through software. An isolated power
supply of 16 to 24 vac is supplied with the sensor, with a
300 mA average and a 500 mA peak. The IAQ sensors are
available in 3 models: Wall Mount with LED (light-emitting
diode), Wall Mount, and Duct Mount.
The wall-mounted sensors are mounted within the occupied
space. They read the CO levels at their location. The Wall
2
Mount with LED sensor will display the current reading on the
LED display screen on the sensor.
When the IAQ sensor is used in TEMP system applications,
it is usually wall-mounted and wired to the relay pack.
TEMP SYSTEM IAQ SENSOR WIRING — Wire the dry
contact relay output from the sensor (connections 3 and 4) to
terminals 6 and 7 of the relay pack. Recommended gage of
wire is 14, stranded.
Wire the 2 wires from the isolated 16 to 24 vac power sup-
ply to the power input side of the sensor (connections 1 and 5).
Recommended gage of wire is 14, stranded. The green/red
LED on the sensor shows steady green during normal
operation.
Configure the options associated with the sensor. Refer to
the IAQ Sensor section on page 14.
The relay pack should be
An
Provide Power To Relay Pack —
has been completed, provide power to the relay pack. Once
power has been provided to the relay pack, the relay pack will
provide power to the thermostat. The heating or cooling set
points will appear on the thermostat display screen. The ther-
mostat is now ready to be programmed. If the display is blank
or blinking, recheck the wiring connections between the ther-
mostat and relay pack. There should be a steady 10 vdc be-
tween the red and white connections.

CONFIGURATION

Configuration can be done either manually with the set
point buttons on the TEMP system thermostat, or by computer
with the Carrier network access software through the system
network. Refer to each specific section in this manual for de-
tailed instructions on configuring the TEMP system thermostat
options. Refer to the software manual for network software
configuration.
A special start-up category of options (category 8.0) has
been designated as the start-up category. This category contains
options that must be configured correctly before the TEMP
system thermostat will operate. After installation, configure the
start-up (8.0) category first. The start-up category will automat-
ically be displayed when programming mode is accessed, after
the thermostat is powered up for the first time, or when the de-
vice address is set to 0.
Manual Configuration —
TEMP system thermostat, press both upper or both lower set
point buttons simultaneously. See Fig. 6 and 7. The configura-
tion screen will display the current category in the lower right
corner (numbered from 1 to 14). Press the left upper or lower
set point buttons to access the different configuration catego-
ries. Press the select (right lower set point) button to accept the
current category for modification. The word ''option'' will be
displayed, along with the current option number. The escape
(right upper set point) button can be used to return to the cate-
gory screen. The categories will loop around when scrolling
from 14 back to 1.
The left upper and lower set point buttons are used to toggle
through the options of each category. The word ''option,''
the option number, and the current data stored in the option
are displayed on the screen. See Table 1 for categories and op-
tions. When the desired option is shown on the screen, press
the select button. The configurable data will flash. The left set
point buttons are used to toggle or change the data values.
When the desired setting is shown press the enter button to
store the change. To exit without saving changes, press both
upper or both lower set point buttons or press the escape but-
ton. If no buttons are pressed while in programming mode for
3 minutes, the TEMP system thermostat will reset back to the
normal display.
Each option is discussed in detail in this manual. Refer to
the correct section for more information.
Computer Configuration —
system thermostat with an IBM compatible computer, Carrier
network access software must be used.
4
After the wiring
To manually configure the
To configure the TEMP