Carrier 40UV Installation, Start-Up And Service Instructions Manual page 34

COOL HEAT
Carrier
®
Fig. 19 — Linkage Thermostat
Thermostat Power Supply — The thermostat power supply,
included in the accessory package, provides the required
DC voltage to operate the thermostat. The power supply
includes 24 vac (Class II) transformer.
The transformer and power supply can be mounted within
the unit's control enclosure.
Wiring between the thermostat and the power supply is
limited to 100 ft maximum. If longer distances are required, the
power supply and transformer must be remotely mounted
closer to the thermostat. Be sure to follow all code require-
ments when remotely mounting the transformer as the primary
wiring is Class I circuit type. The thermostat power wiring
requires the use of a 2-conductor, 18 AWG, twisted pair cable
to connect the power supply output terminals to the thermostat.
Follow the installation instructions shipped with the thermostat
for proper installation.
Thermostat Communication Wiring — The thermostat uses
CCN network communications to exchange data between the
thermostat and the equipment control or the CCN network for
system functions. Use 3-conductor, 20 AWG (American Wire
Gage) minimum, shielded cable as specified in the Carrier
Comfort Network® Interface section. See Table 14.
Thermostat Remote Room Sensor Option — The installer
has the option of mounting the thermostat in a mechanical
closet or other location in order to limit access to the device. A
remote sensor option can be installed in the space to properly
sense temperature at the occupied location. Refer to the instal-
lation instructions shipped with the thermostat for additional
information on this option.
Table 14 — CCN Cable Requirements
MANUFACTURER
Alpha
American
Belden
Columbia
INDOOR AIR QUALITY (IAQ) SENSOR (Field-Installed
Accessory) — The wall-mounted sensor monitors CO
conditioned air space, and uses infrared technology to detect
the levels of CO present in the air. See Fig. 20. This informa-
2
tion is used to modify the position of the outdoor-air dampers
to admit more outdoor air as required to provide the desired
ventilation rate. The sensor is available with or without an
LCD readout to display the CO
sory descriptions and part numbers are shown in Table 15. To
mount the sensor, refer to the installation instructions shipped
with the accessory kit.
CABLE NO.
2413 or 5463
A22503
8772
02525
in the
2
level in ppm. Sensor acces-
2
Table 15 — Indoor Air Quality Sensor Accessories
CO SENSOR ACCESSORY
2
PART NUMBERS
CGCDXSEN001A00
CGCDXSEN002A00
CGCDXGAS001A00
The CO sensors in Table 15 are all factory set for a range of
2
0 to 2000 ppm and a linear voltage output of 2 to 10 vdc.
Fig. 21 shows ventilation rates for various CO
a typical CO level of 350 ppm is used. Refer to the instruc-
2
tions supplied with the CO
and terminal locations. A separate isolated field-supplied trans-
former is required to provide power to the sensor.
Any changes to the factory configuration of the sensor
require use of the User Interface Program (UIP), which is
included in the sensor calibration service kit.
The sensor must be properly located to accurately measure
the air quality of the occupied space. It should be mounted in a
location that will avoid direct breath contact.
Do not mount the sensor in drafty areas such as near the unit
discharge, open windows, fans, or over heat sources. Allow at
least 3 ft between the sensor and any corner. Avoid mounting
the sensor where it is influenced by the supply air; the sensor
gives inaccurate readings if supply air is blown directly onto
the sensor.
5.625
(14.3)
3.25
(8.3)
NOTE: Dimensions are in inches.
Dimensions in ( ) are in centimeters.
Fig. 20 — Indoor Air Quality (CO
(PN 33ZCSENCO2)
Fig. 21 — Ventilation Rates Based on
CO
34
DESCRIPTION
Wall Mount Sensor (No Display)
Wall Mount Sensor with Display
Sensor Calibration Service Kit
set points when
2
sensor for electrical requirements
2
1.125
(2.9)
) Sensor
2
Set Point
2
5
(12.7)
0.25
(0.8)