48-50P030-100
48/50A020-060, 48/50P030-100,
FRONT VIEW
SIDE VIEW
MOUNTING PLATE
Fig. 1 — CO2 Sensor
CO2 Sensor Accessory
Installation Start-Up and
Service Instructions
Part No. CRCBDIOX002A00
48/50Z030-105
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Check Package Contents. . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Configuring the ComfortLink™ Controller. . . . . . . . 4
Verification and Calibration . . . . . . . . . . . . . . . . . . . . . . 4
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SAFETY CONSIDERATIONS
Installing, starting up and servicing HVAC (heating, ventilation, and air conditioning) equipment can be hazardous due to
system pressures, electrical components and equipment
locations.
Only trained, qualified installers and service technicians
should install, start up and service this equipment.
When working on HVAC equipment, observe precautions
in the literature, labels attached to the equipment and any other
safety precautions that apply. Follow all safety codes. Wear
safety glasses and work gloves. Use care when handling and
installing the sensor.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety alert
symbol . DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies a hazard which could result in personal
injury or death. CAUTION is used to identify unsafe practices
which would result in minor personal injury or property
damage.
The unit utilizes a 4 to 20-mA analog signal. The ComfortLink
controller uses this signal to control the economizer damper
position and ensure adequate level of outside air in the
building. This is one of several approved methods of controlling the indoor-air quality (IAQ) in a building and meets the
requirements of local building codes and ASHRAE (American
Society of Heating, Refrigerating and Air Conditioning
Engineers) Standard 62. The control sensor features a membrane-covered waveguide and sample chamber that produces
stable, reliable, and highly accurate carbon dioxide readings.
The sensor is self-calibrating and should not need to be
manually calibrated.
Check Package Contents — Remove accessory pack-
aging and inspect shipment for damage. If any damage is found,
file a claim with the shipping agent immediately. If any item is
missing or any part does not assemble properly, notify your
Carrier distributor. Table 1 lists the accessory package contents.
Table 1 — Accessory Package Contents
ITEM QUANTITY
CO
Sensor (Part No. HH99ZZ019) 1
2
Bracket (48/50A) 1
No. 8-18 x
1
/4 AB-14 x 5/8 Screw 2
Electrical Harness* 1
Bracket (48/50P,48/50Z) 1
*Do not use the electrical harness provided in this kit for 48/50P and
48/50Z units.
1
/4 Screw 2
WARNING
Prior to installation of this accessory, make sure all power
is disconnected to the unit and locked out. Failure to disconnect power supply prior to servicing may result in serious injury.
GENERAL
The CO2 sensor (Fig. 1) is designed to monitor carbon
dioxide (CO
ComfortLink™ controller on the rooftop air-conditioning unit.
The sensor perceives CO
million (ppm) range and provides outputs indicating this level.
Catalog No. 04-53480064-01 Printed in U.S.A. Form 48/50-73SI Pg 1 8-09 Replaces: 48/50A-4SI
) levels in the return air and interface with the
2
levels in the 0 to 2,000 parts per
2
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
INSTALLATION
CO
2
SENSOR
AUXILIARY
CONTROL BOX
PARTITION
BRACKET
(48/50A)
ELECTRICAL
HARNESS
Fig. 2 — 48/50A CO2 Sensor Mounting Location
VIEW F
48/50A Units —
predrilled holes located above the auxiliary control box (see
Fig. 2).
1. Shut off unit power supply.
2. Open the hinged auxiliary control box access door and
secure.
3. Remove the sensor and cover from the sensor mounting
plate.
4. Secure mounting plate to bracket (48/50A) with no. 8
screws (see Fig. 3).
5. Wire the electrical harness to the sensor as shown in
Fig. 3 and 4.
6. Remove the blankout plate from the partition, just above
the auxiliary control box.
7. Attach the sensor to the mounting plate.
8. Mount the bracket to the partition using 2 sheet metal
screws (see view F in Fig. 2).
9. Connect the electrical harness (PL18).
10. Restore power to unit.
The CO2 sensor is to be installed in the
48/50P and 48/50Z Units — The CO
sensor is to be
2
installed in the predrilled holes located in the power exhaust
section. See Fig. 5-11.
1. Shut off unit power supply.
2. Open the power exhaust section doors/panels to gain
access.
3. Remove the sensor and cover from the sensor mounting
plate.
4. Secure mounting plate to the bracket with no. 8 screws.
5. The electrical wire harness for the CO
sensor is factory
2
installed. Locate the four wires in the power exhaust
section. Wire the electrical harness to the sensor as shown
in Fig. 4.
6. Attach the sensor to the mounting plate.
Mount the bracket to the appropriate location:
size 030-050 units with power exhaust, see Fig. 5 and 6.
size 030-050 units with economizer only, see Fig. 7.
size 030-050 units with no economizer or power exhaust,
see Fig. 8.
48/50P055-100 and 48/50Z055-105 units with power exhaust, see Fig. 9.
48/50P055-100 and 48/50Z055-105 units with economizer only, see Fig. 10.
48/50P055-100 and 48/50Z055-105 units with no economizer or power exhaust, see Fig. 11.
2
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