42KC, 45UC, 45XC, 35BF
Access Floor Terminal Units
Installation, Operation and
Configuration Instructions
AXIS™
CONTENTS
Page
SAFETY CONSIDERATIONS...................... 1
GENERAL ...................................... 2-5
System Overview ................................ 2
System Architecture ............................. 3
PRE-INSTALLATION.............................. 6
Unpack and Inspect Units ........................ 6
Storage and Handling ............................ 6
Prepare Jobsite for Unit Installation.............. 6
45XC FAN-POWERED ZONE MIXING UNIT
INSTALLATION.............................. 6-27
45XC Hardware................................... 7
45XC Field-Supplied Hardware ................... 7
45XC Fan-Powered Zone Mixing Box
Installation ..................................... 9
45XC Sensor Installation ........................14
45XC Input and Output Connectors ............. 25
Connect to the CCN Communication Bus .......26
Connect Air Pressure Tubing.................... 26
45UC UNDERFLOOR SERIES FAN-POWERED
TERMINAL INSTALLATION ................. 27-35
45UC Hardware.................................. 27
45UC Field-Supplied Hardware .................. 27
45UC Underfloor Series Fan-Powered Unit
Installation ....................................29
45UC Sensor Installation ........................30
Connect to the CCN Communication Bus .......30
Modulating Baseboard Hydronic Heating........35
42KC PERIMETER FAN COIL UNIT
INSTALLATION............................. 36-45
42KC Hardware.................................. 36
42KC Field-Supplied Hardware .................. 37
42KC Perimeter Fan Coil Unit Installation ....... 37
Connect the Power Transformer................. 38
Fan Coil Controller Inputs and Outputs .........44
42KC Sensor Installation ........................44
35BF DIFFUSER INSTALLATION.............. 46-49
35BF-R Swirl Diffuser Installation ............... 46
35BF-CT,D,V Linear Diffuser Installation......... 46
OPERATION .................................. 50,51
Initial Start-Up Procedures ...................... 50
45XC Start-Up and Checkout Procedure......... 50
42KC Start-Up................................... 50
Page
CONFIGURATION ............................ 51-68
45XC Commissioning ........................... 51
45XC Set-Up and Configuration .................51
42KC Set-Up and Configuration .................57
42KC Fan Coil Airflow Adjustment .............. 57
Setting Fan Airflow with ECM ................... 57
Balancing Underfloor Fan Terminals ............ 57
Speed Controller ................................ 60
Set Points ....................................... 60
Testing and Start-Up ............................ 61
45XC Operation ................................. 62
42KC Fan Coil Sequence ........................ 66
45XC Application Considerations ............... 66
Maintenance ................................... 67
SAFETY CONSIDERATIONS
SAFETY NOTE
Air-handling equipment will provide safe and reliable
service when operated within design specifications. The
equipment should be operated and serviced only by
authorized personnel who have a thorough knowledge
of system operation, safety devices and emergency
procedures.
Good judgement should be used in applying any manufacturer’s instructions to avoid injury to personnel or
damage to equipment and property.
Disconnect all power to the unit before performing maintenance or service. Unit may automatically start if power is
not disconnected. Electrical shock and personal injury
could result.
If it is necessary to remove and dispose of mercury contactors in electric heat section, follow all local, state, and federal laws regarding disposal of equipment containing
hazardous materials.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 3 3
Ta b 6 a 7 a
Catalog No. 04-53450001-01 Printed in U.S.A. Form 45-4SI Pg 1 11-05 Replaces: 45-2SI
GENERAL
The 45XC fan-powered mixing box provides plenum pressure and temperature control to the underfloor plenum. The
45XC mixing box is also equipped with a modulating primary
air damper and a variable speed fan. Together, these features
allow the 45XC unit to maintain plenum pressure at the desired
pressure set point while adjusting the plenum temperature to
match the load requirements.
The 45UC series underfloor fan-powered terminal and the
42KC fan coil unit are used to provide increased cooling or
supplemental heating to perimeter zones. These units are available with factory-installed electric or hot water heating coils.
The controllers are factory-mounted. The 33ZCPLNCTL
zone controller is supplied on the 45XC fan-powered mixing
box. The 33ZCFANTRM underfloor controller is supplied on
the 45UC underfloor fan-powered terminal. The 42KC fan coil
units contain the 33ZCFANCOL perimeter fan coil controller.
All are designed to be an integral part of the Carrier Direct Digital Controls (DDC) system. The controllers can communicate
on the Carrier Comfort Network® (CCN) system while completely integrating with the building’s heating, ventilation and
air conditioning (HVAC) system.
System Overview — Electronic control units feature a
factory-installed enclosure that provides easy access for field
connections.
The 45XC zone controller is factory-supplied and factoryconfigured, and consists of a processor, pressure transducer and
actuator. The controllers are configured to maintain the plenum
pressure between 0.01 and 1.0 in. wg and to control and maintain space temperature by measuring both plenum and space
temperature. The space temperature set point may be adjusted
by the user through the space temperature sensor without additional software.
Each 45XC zone controller also has the ability to function
as a linkage coordinator for systems with up to 128 zones. As a
linkage coordinator, a controller retrieves and provides system
information to the air-handling equipment and other zone
controllers. When a primary supply air sensor is installed, the
controller can function as a stand-alone device. See Fig. 1
and 2.
The controller monitors differential pressure from two pressure probes: one mounted in the space and one in the pressurized plenum. It compares the resulting signal to a plenum
pressure set point in order to provide pressure-independent
control of the air passing through the mixing box into the
plenum.
The controller is wired to a wall-mounted, field-supplied,
space temperature sensor (SPT) in order to monitor zone
temperature changes and satisfy zone demand.
The controller is designed to allow a service person or
building owner to configure and operate the unit through the
CCN user interface, however, a user interface is not required
for day-to-day operation. All maintenance, configuration, setup, and diagnostic information is available through the Level II
communications port to allow data access by an attached computer running Network Service Tool, ComfortVIEW™, or
ComfortWORKS® software.
PMET
S
S
FAN MOTOR
INTERFACE
(
ECAP
T
ERUTARE
ROSNE
ROOLFREDNU
MUNELP
NOC ENOZ ROOLFREDNU
)LTCNLPCZ33
SPACE
PRESSURE
SENSOR
R
ELLORT
PRIMARY AIR
TEMPERATURE
SENSOR
AIRFLOW
SENSOR
PRIMARY AIR
DAMPER
GIH
WOL
DAMPER
ACTUATOR
H
TROP
TROP
CONTROLS
ENCLOSURE
PRIMARY
P
IA
R
AIR DUCT
RAMIR
Y
ROSNES ERUSSERP MUNELP
EC
MIXED AIR
T
FAN
NRUTER / GNILI
RIA MUNELP
RETLIF
)deilppus-dleif(
RIA YLPPUS
ERUTAREPMET
FIELD-SUPPLIED
FILTER MONITOR
ERUSSERP
WS
HCTI
)deilppus-dleif(
RETURN
DUCT
3 equivalent diameters
of straight discharge duct
(minimum)
Fig. 1 — Typical Installation of Single 45XC Fan-Powered Mixing Unit
for Each Underfloor Zone
2
PMET
S
S
FAN MOTOR
INTERFACE
(
ECAP
T
ERUTARE
ROSNE
ROOLFREDNU
MUNELP
PRIMARY
RAMIR
TIC
)rosneS wolfriA(
Y
Y
than one
erom htiw snoitacilppa ni desu(
AIR DUCT
EC
EBORP
)munelp nommoc a gnizirusserp tinu CX54
MIXED AIR
T
FAN
NRUTER / GNILI
RIA MUNELP
RETLIF
)deilppus-dleif(
RIA YLPPUS
ERUTAREPMET
FIELD-SUPPLIED
FILTER MONITOR
ERUSSERP
WS
HCTI
)deilppus-dleif(
RETURN
DUCT
3 equivalent diameters
of straight discharge duct
(minimum)
P
IA
PRIMARY AIR
TEMPERATURE
SENSOR
AIRFLOW
SENSOR
PRIMARY AIR
DAMPER
DAMPER
R
NOC ENOZ ROOLFREDNU
ELLORT
)LTCNLPCZ33
ACTUATOR
HGIH
TROP
W
OL
R
TOP
CONTROLS
ENCLOSURE
R
OLEV DELLATSNI-DLEIF
Fig. 2 — Typical Installation for Multiple 45XC Fan-Powered Mixing Units
in a Larger Common Underfloor Zone (One 45XC Unit Shown)
System Architecture — Figure 3 shows the typical
control system architecture: a 45XC mixing box unit used to
provide the main plenum pressure and temperature control and
four 42KC fan coil units to provide supplemental heating and
cooling.
Figure 4 shows an arrangement of underfloor and zone
controllers and terminal units employed in the HVAC system
of a large building. Though all controllers are connected to the
same bus, controllers are configured to stand alone, satisfying
the needs of individual zones. These are commonly used in
perimeter zones. All underfloor controllers participate in linkage, with one configured as a linkage master; the rest are
configured as slaves.
This arrangement, from the software point of view, gives
the following information:
• All controllers may be configured to stand alone with their
own sensor OR they may share a temperature sensor
between themselves. The zone controllers do not share
sensor data with underfloor controllers.
• Controllers may have their own temperature sensor (located
near ceiling plenum) OR may share a single temperature
sensor.
• Controllers participate in linkage when sending the damper
position, occupancy, zone temperature and temperature set
point data to the master underfloor controller.
A bridge is recommended to isolate the underfloor control
system from the primary communication (comm) bus to:
• improve communication quality
• increase communication speed
Controllers use the underfloor plenum as the air source and
control the diffusers to satisfy the space temperature needs.
Controllers also make use of strip heaters for auxiliary heating.
POWER REQUIREMENTS — The power supply is 24 vac
± 10% at 40 va (50/60 Hz).
WIRING CONNECTIONS — Field wiring is 18-gage to
22-gage wire. The zone controller is a NEC (National Electrical
Code) Class 2 rated device.
INPUTS
• space temperature sensor
• primary air damper position
• plenum sensor (factory-installed)
• supply air temperature sensor
• optional primary air temperature sensor (required for sys-
tems which do not utilize a linkage compatible air source)
• optional CO
sensor
2
• optional relative humidity sensor
OUTPUTS
• internally factory-wired VAV (variable air volume) actuator
• internally factory-wired fan speed controller
3
ACCURACY — Terminal airflow pressure control is rated to
1 in. wg measured maximum pressure. The zone controller is
capable of controlling from as low as 0.01 in. wg to as high as
1.0 in. wg nominal pressure with an accuracy of ± 3% (nominal) at any point within the range.
HARDWARE (MEMORY) — The hardware consists of
FLASH EPROM memory.
DIFFERENTIAL PRESSURE SENSOR — Pressure range is
0.0 to 2.0 in. wg maximum for the onboard pressure sensor.
SPECIFIED SENSING TEMPERATURE RANGE — The
controller space temperature measuring range is –40 to 245 F.
This range applies to space temperature, supply-air temperature and primary air temperature sensors. The controller has an
allowable control set point range from 40 to 90 F for heating
and45to99Fforcooling.
COMMUNICATIONS — The maximum number of controllers is limited to 128 zones, with a limit of 8 systems (Linkage
Coordinator configured for at least 2 zones). Carrier Comfort
Network® (CCN) bus length may not exceed 4000 ft, with no
more than 60 devices on any 1000 ft section. Optically isolated
RS-485 repeaters are required every 1000 ft.
Exterior Zones
At 19,200 and 38,400 baud, the number of controllers is
limited to 128 maximum, with no limit on the number of Linkage Coordinators. Bus length may not exceed 1000 ft.
ENVIRONMENTAL RATINGS — Operating Temperature
is 32 to 140 F at 0 to 90% rh (relative humidity)
(non-condensing).
Shipping Temperature is –40 to 185 F at 0 to 90% rh
(non-condensing).
PERFORMANCE VIBRATION
• 0.014 in. peak-to-peak displacement measured at 5 to 31 Hz
• 0.75 G measured at 31 to 300 Hz
CORROSION — Equipment intended for indoor use only.
APPROVALS
• listed under UL 873
• conforms to requirements per European Consortium
standards EN50081-1 (CISPR 22, Class B) and EN50082-1
(IEC 801-2, IEC 801-3, and IEC 801-4) for CE mark
labeling
• UL94-5V plenum rated (housing and actuator)
35BF-D
42KC
42KC
Exterior Wall
LEGEND
42KC — Perimeter Fan Coil Unit with 33ZCFANCOL Fan Coil Controller
45XC — Fan-Powered Zone Mixing Unit with 33ZCPLNCTL Zone Controller
T—Wall-Mounted Temperature Sensor
35BF-D Linear Diffuser
35BF-R Swirl Diffuser
42KC
42KC
45XC
35BF-R
Interior Zones
Fig. 3 — Typical System Layout (45XC and 42KC)
4
CCN PRIMARY BUS (BUS 0)
CCN
SYSTEM
MONITORING
SOFTWARE
FAN COIL
CONTROLLER
45UC UNIT
(33ZCFANTRM)
FULLY CCN
COMPATIBLE CARRIER
AIR HANDLER
SECONDARY BUS
CC6400 OR CSAM
EQUIPPED
NON-CARRIER
AIR HANDLER
COMFORT ID™
EQUIPPED
AIR TERMINAL
(1 OF UP TO 128)
ADDRESSED
SEQUENTIALLY
45XC UNIT
(33ZCPLNCTL)
TYPICAL 42KC
FAN COIL UNIT
BRIDGE
(RECOMMENDED)
FAN COIL
CONTROLLER
(33ZCFANCOL)
TYPICAL 42KC
FAN COIL UNIT
LEGEND
CCN — Carrier Comfort Network®
CSAM — Comfort System
Air
Manager™
Fig. 4 — Control System Architecture with Underfloor Terminal Units
DATA
COLLECTION
OPTION
42KC UNIT
(33ZCFANCOL)
TO OTHER
CONTROLLERS
ON COMM BUS
5
PRE-INSTALLATION
Unpack and Inspect Units —
from all units. Check the shipment against shipping order.
Inspect for damage upon receipt. If shipment is damaged or
incomplete, file claim with transportation company and advise
Carrier immediately.
Remove shipping wraps
Storage and Handling — Store in a clean, dry and
covered location. Do not stack units. When unpacking units,
care should be taken that the inlet collars and externally mounted components do not become damaged. Do not lift units using
collars, sensors, or externally mounted components as handles.
If a unit is supplied with electric or hot water heat, care should
be taken to prevent damage to these devices. Do not lay uncrated units on end or sides. Do not stack uncrated units over 6 ft
high. Do not handle control boxes by tubing connections or
other external attachments.
PRIMARY
AIR DUCT
Prepare Jobsite for Unit Installation — To s av e t im e
and to reduce the possibility of costly errors, set up a complete
sample installation in a typical room at the jobsite. Check all
critical dimensions. Refer to job drawings and product dimension drawings as required.
45XC FAN-POWERED ZONE MIXING UNIT
INSTALLATION
Physical components of the 45XC fan-powered zone
mixing unit is detailed in Fig. 5. Figure 6 shows 45XC fanpowered zone mixing unit dimensions and weight data.
CEILING PLENUM
RETURN AIR
DUCT
CONTROL
ENCLOSURE
42 in. MINIMUM - SIZE 04
54 in. MINIMUM - SIZE 07
LOW AND HIGH
PRESSURE PORT*
RAISED FLOOR
*Installation is shown for a single unit in a multiple unit/common plenum application.
High and low pressure ports piped to a discharge plenum. Refer to Fig. 2.
SUPPLY AIR
TEMPERATURE
PROBE
SUPPLY DUCT
Fig. 5 — 45XC Fan-Powered Zone Mixing Unit Physical Details
6
1/2" DIA.
H
X
Y
D
PRIMARY
AIR INLET
W
DAMPER SHAFT
DD
1/2"
20"
ALLOW AT LEAST
24" CLEARANCE
FOR CONTROLS
J 11 7/8"
6 1/4"
A
B 1-1/2"
INLET VIEW
45XC UNIT SIZE UNIT WEIGHT (lb) FILTER SIZE (in.) FILTER P/N FILTER KIT P/N
4 209 17 x 17 x 1 102649-1717 3503341717
7 269 22 x 19 x 1 102649-2219 3503342219
INLET
UNIT
SIZE
*Estimated for rpm/torque controlled motor, at 0.1 in. wg static pressure under floor.
NOTE: Inlet Size: 6-10, DD = 3
SIZE
(in.)
4
7
PRI.
CFM
6 500 1200 1700
8900 1200 21001/2361/8361/8181/16151/815 77/811 14 9 631/831/
10 1400 1200 26001/2361/8361/8181/16151/815 97/811 14 9 731/831/
12 2100 1200 33001/2361/8361/8181/16151/815 117/811 14 9831/
10 1400 2500 3900 1 42
12 2100 2500 4600 1 421/8461/8201/16201/817 117/815 17 10 8 51/241/
14 2800 2500 5300 1 421/8461/8201/16201/817 137/815 17 10 10 51/
16 3700 2500 6200 1 421/8461/8201/16201/817 157/815 17 10 101/451/
FA N
CFM*
7
/8in. Inlet Size: 12-16, DD = 57/8in.
1-1/4"
MAX
FLOW
RECIRCULATED
AIR INLET
MOUNTING BRACKET - (4 PLCS)
SEE OPTIONAL FEATURES BELOW
PLAN VIEW – LEFT HAND UNIT
RIGHT HAND UNITS AVAILABLE - CONTROLS NOT SHOWN
HP
LWH
1
/2361/8361/8181/16151/815 57/811 14 9 631/831/
1
/8461/8201/16201/817 97/815 17 10 7 51/241/
L
Recirc. Air
AB FG
Fig. 6 — 45XC Fan Powered Zone Mixing Unit Physical Data and Dimensions
45XC Hardware — The 45XC fan-powered mixing unit
contains the 33ZCPLNCTL zone controller.
Figure 7 shows the zone controller physical details.
SUPPLY-AIR TEMPERATURE (SAT) SENSOR (Fig. 9) —
The zone controller must be connected to a field-supplied supply air temperature (SAT) sensor (P/N 33ZCSENSAT) to monitor the temperature of the air delivered by the fan coil.
45XC Field-Supplied Hardware — Each 45XC fan-
powered zone mixing unit requires the following field-supplied
components to complete its installation:
• transformer — 24 vac, 40 va (standard applications)
• contactors (as required for electric heat)
1
•
/4-in. OD flame retardant polyethylene tubing (length not
toexceed25ft)
• space temperature sensor (33ZCT55SPT, 33ZCT56SPT, or
33ZCT57SPT)
• supply-air temperature sensor (33ZCSENSAT) with two
no. 10 x
supply duct)
• primary-air temperature sensor
• indoor-air quality (CO
• relative humidity sensor (optional)
SPACE TEMPERATURE SENSOR (Fig. 8) — Each
33ZCPLNCTL zone controller requires a field-supplied
Carrier space temperature sensor. There are three sensors
available for this application:
• 33ZCT55SPT, space temperature sensor with override
button
• 33ZCT56SPT, space temperature sensor with override
button and set point adjustment
1
/2-in. sheet metal screws (to secure SAT sensor to
) sensor (optional)
2
PRIMARY-AIR TEMPERATURE SENSOR (PAT)
(Optional) — A field-supplied, primary air temperature (PAT)
sensor (P/N 33ZCSENPAT) is used on a zone controller that is
functioning as a linkage master for a non CCN/linkage compatible air source. See Fig. 10.
INDOOR-AIR QUALITY (CO
indoor air quality sensor is required for IAQ monitoring.
Three different CO2sensors are available for zone CO2level
monitoring.
• The 33ZCSENCO2 sensor is an indoor, wall-mounted sensor with an LED (light-emitting diode) display.
• The 33ZCT55CO2 sensor is an indoor, wall-mounted sensor without display. The CO
temperature sensor with override button.
• The 33ZCT56CO2 sensor is an indoor, wall-mounted sensor without display. The CO
temperature sensor with override button and temperature
offset.
RELATIVE HUMIDITY SENSOR (Fig. 12) — The relative
humidity sensor (P/N 33AMSENRHS000) is an indoor, wallmounted sensor and is required for zone humidity control
(dehumidification).
• 33ZCT57SPT, space temperature sensor with override button, set point adjustment, and manual fan speed control
DISCHARGE
DIMENSIONS (in.)
Discharge
D
G
Z
F 2 9/16"
DISCHARGE VIEW
XY Z J
8
8
8
31/
8
8
8
8
41/
8
2
41/
2
8
)SENSOR(Fig.11)—An
2
sensor also includes a space
2
sensor also includes a space
2
7
0
HF23BJ042
Made in Switzerland
by Belimo Automation
LR 92800
NEMA 2
LISTED
94D5
TENP IND &
REG. EQUIP.
Class 2 Supply
5K
WIP
yel
blu
ora
35 in-lb (4 Nm)
80...110s
24VAC/DC
50/60 Hz
3VA 2W
COM
1
2
red wht
blk
15
LOW
1
®
3
ZONE Controller
Part Number: 33ZCPLNCTL
S/N:
Bus#:
Element#:
Unit#:
HIGH
US
C
1
J6
2
1
J7
3
®
1
J8
3
SEC DMP
J6
1
CCW
COMCWHEAT1
24VAC
HEAT2
FAN AC
FAN
24VAC
N/A
HEAT3
CW
COM
COW
6
RH/IAQ
GND
SECFLOW
J4
+10V
DMPPOS
GND
TEST
GND
1
1
CCN
J2A
3
1
3
+
G
-
J1
+24V
SPT
GND
SAT
T56
GND
PAT
REMOTE
J3
24VAC
16
2
1
+
LEN
G
-
J2B
3
SRVC
+
-
G
Fig. 7 — 45XC Fan-Powered Zone Mixing Unit Controller Physical Details (33ZCPLNTCTL)
Cool
Warm
Fig. 8 — Space Temperature Sensor (P/N 33ZCT56SPT Shown)
.08
.39
FOAM GASKET
3.90
.40'' O.D.
.250 ±.01 Dia
.175 DIA
x .600
3.00
PLENUM RATED CABLE
114'' ±6
5.5 ±.5
NOTE: Dimensions are in inches.
Fig. 9 — Supply Air Temperature Sensor (33ZCSENSAT)
8
Fig. 10 — Primary Air Temperature Sensor
(33ZCSENPAT)
5.625
(14.3)
3.25
(8.3)
NOTE: Dimensions are in inches. Dimensions in () are in
centimeters.
1.125
(2.9)
5
(12.7)
0.25
(0.8)
Fig. 11 — Indoor Air Quality (CO2) Sensor
(33ZCSENCO2)
Fig. 12 — Wall-Mounted Relative Humidity Sensor
(33AMSENRHS000)
45XC Fan-Powered Zone Mixing Box Installation
STEP 1 — SELECT LOCATION
1. Units should be installed so that they do not come in contact with obstacles such as rigid conduit, sprinkler piping,
Greenfield flexible metal covering, or rigid pneumatic
tubing; such contact can transmit vibration to the building
structure, causing objectionable low frequency noise.
2. Units should never be installed tightly against concrete
slabs or columns, as vibration transmission is amplified in
this condition.
3. Fan-powered terminals require sufficient clearance for
servicing the blower/motor assembly from the bottom of
the unit, low voltage controls from the side and line
voltage motor controls or electric heat (if equipped) from
the rear (discharge end) of the unit. See Fig. 6.
Bottom access panel removal requires a minimum of
3-in. minimum clearance, in addition to substantial horizontal clearance, to slide the access panel out of the way
for service. Actual horizontal dimensions will vary due to
varying access panels for different sized units. See unit
submittal drawings for detailed information.
NOTE: Be certain that accommodations for panel removal of unit casings are large enough to allow adequate
internal service room once the panels are removed.
A clearance of 18 in. is recommended for control enclosure access. Unit control enclosure will vary depending
on which control package is used. Control enclosure
location is specified on unit submittals. Low voltage
enclosure covers are removable, not hinged.
A clearance of 36 in. is recommended for line voltage
motor controls and electric heat control access. High voltage motor controls or electric heat control access is
supplied with hinged access doors for units with fused
disconnect. Specific location is indicated on the unit
submittal.
These recommendations do not supersede NEC (National
Electrical Code) or local codes that may be applicable.
Adherence to these codes are the responsibility of the
installing contractor.
4. Whenever possible, fan-powered boxes should be
installed over halls or passageways (rather than over
occupied spaces) in order to limit the sound reaching
occupants.
STEP 2 — POSITION UNIT
1. When moving boxes, use appropriate material handling
equipment and avoid contact with shaft extensions, controls, wiring, piping, heaters, and control boxes.
2. Raise unit to position using safe mechanical equipment
and support until hanging means are attached and box is
level.
STEP 3 — INSTALL UNIT
1. Install field-supplied eyebolts, straphangers or bolt rod
supports as desired. Figure 13 illustrates possible 45XC
unit suspension methods. A typical underfloor installation
is shown in Fig. 14.
2. Care should be taken to use hanging materials of sufficient stiffness and strength, rigidly attached to the unit.
Straps should not be located on coil flanges, electric heat
sections, or control boxes. When using trapeze supports,
avoid areas where access is required to side mounted
controls, or side or bottom access doors. For best installation with trapeze supports, provide elastomeric material
between unit and supports.
3. Hangers should be securely attached to bar joist or
mounting anchors properly secured to building structure
with lugs or poured-in-place hangers. Percussion nails are
not considered adequate anchors.
9
STEP 4 — MAKE DUCT CONNECTIONS
1. Check that the pressure pick-up in primary air collar is
located properly and that air supply duct connections are
airtight. Install supply ductwork on unit inlet collar,
following all accepted medium-pressure duct installation
procedures. Seal joints against leakage.
NOTE: For maximum efficiency in controlling radiated
noise in critical applications, inlet ducts should be fabricated of 24-gage minimum sheet metal in place of flex
connections. Flex duct is extremely transparent to radiated sound; consequently high inlet static pressure (Ps) or
sharp bends with excessive pressure drop can cause a radiated noise problem in the space. If flex duct is used, it
should be limited to the connection between the distribution duct and the boot diffuser.
2. Install the discharge duct, being careful not to reduce the
face area of any electric heat section until several diameters away from the unit. It is strongly recommended that
lined discharge duct be used downstream of the unit.
Insulate duct as required.
3. Fan boxes should not be attached to octopus sections
immediately downstream of the unit.
4. Install optional return-air filters before operating the unit.
5. Leave construction filters supplied with the box in place
until installation is complete and building is cleared for
occupancy.
STEP 5 — POWER WIRING
Disconnect electrical power before wiring or servicing the
unit. All disconnect switches on the terminal (if equipped)
should be in the OFF position while making power connections. Electrical shock, personal injury, or damage to the
zone controller can result.
1. All power wiring must comply with local codes and with
NEC ANSI/NFPA (American National Standards
Institute/National Fire Protection Association) 70-1981.
Disconnect switches are optional equipment. Electrical,
control and piping diagrams are shown on the exterior
labeling or on a diagram inside the control and highvoltage enclosure covers, unless otherwise specified in
the order write-up. All units are wired for a single point
electrical connection to the fan and electric heater (if
equipped). Electric heaters provided by Carrier are
balanced by kW per stage. The installing electrician
should rotate incoming electric service by phase to help
balance overall building load.
2. All field wiring must be provided with a safety disconnect per NEC 424-19, 20, and 21.
3. Units with electric heat should use copper wires rated at
least 125% of rating plate amperage. Refer to the unit’s
rating label and minimum supply circuit amps.
4. Observe wiring diagram and instructions attached to the
unit. A Wye power source with a fourth (neutral) wire in
addition to the full sized ground wire is required for
480-v, 3-phase units. All units must be grounded as
required by NEC 424-14 and 250. See Fig. 15A and 15B.
ACCESSORY
HANGER
SUPPORT
ROD
FIELD-SUPPLIED
BRACKET
HANGER
DO NOT SUSPEND UNIT BY
TRAPEZE HANGERS THAT
INTERFERE WITH THE
UNIT ACCESS PANEL
Fig. 13 — Typical 45XC Support Methods
10
ROOM
SENSOR
45XC
FAN POWERED
ZONE MIXING
BOX
Fig. 14 — Typical Underfloor Installation — 45XC Fan-Powered Mixing Box
35 BF-R
SWIRL DIFFUSER
11
LEGEND
Factory Piping
Factory Wiring
Fig. 15A — 45XC Zone Controller Wiring — Control Package 4840
Field Wiring
to the fully closed position. Mount actuator over damper shaft and
secure to shaft enclosure. Engage clutch and rotate damper CCW to
AFS — Airflow Switch
COM — Common
CCW — Counterclockwise
CW — Clockwise
DMPPOS — Damper Position
ECM — Electronically Commutated Motor
GND — Ground
N.O. — Normally Open
PAT — Primary Air Temperature Sensor
SAT — Plenum Temperature Sensor
SPT — Space Temperature Sensor
UL — Underwriter’s Laboratories
NOTES:
the fully open position.
1. Verify actuator bushing is in the full CW position. Rotate damper CW
2. Use insulated quick connects.
Electric shock may result. Disconnect unit prior to servicing unit.
3. These controls have been wired to comply with UL-1995.
12
LEGEND
Factory Piping
Factory Wiring
Field Wiring
AFS — Airflow Switch
COM — Common
CCW — Counterclockwise
CW — Clockwise
DMPPOS — Damper Position
ECM — Electronically Commutated Motor
GND — Ground
N.O. — Normally Open
PAT — Primary Air Temperature Sensor
SAT — Plenum Temperature Sensor
SPT — Space Temperature Sensor
UL — Underwriter’s Laboratories
Electric shock may result. Disconnect unit prior to servicing
CW to the fully closed position. Mount actuator over damper
shaft and secure to shaft enclosure. Engage clutch and rotate
damper CCW to the fully open position.
NOTES:
1. Verify actuator bushing is in the full CW position. Rotate damper
2. Use insulated quick connects.
unit.
3. These controls have been wired to comply with UL-1995.
13
Fig. 15B — 45XC Zone Controller Wiring — Control Package 4841
45XC Sensor Installation
GENERAL SENSOR INSTALLATION — The sensor should
be mounted:
• on an internal wall near a return air grille or duct
• at least 3 ft from any corner, 2 ft from an open doorway and
4 to 6 ft from the floor
• proximal to the wiring egress on the wall
• where temperature operating limits are 32 to 122 F
The sensor should NOT be mounted:
• close to a window, on an outside wall, or next to a door
leading to the outside
• close to or in direct airflow of areas such as open windows,
drafts or over heat sources
• in areas with poor air circulation, such as behind a door or in
an alcove where there are dramatic temperature fluctuations
or moisture accumulation
• where it is influenced by supply air as the sensor will give
an inaccurate reading
• where it may be exposed to direct occupant breathing, such
as near water coolers or coffee machines.
SPACE TEMPERATURE SENSOR INSTALLATION —
A space temperature sensor must be installed for each zone
controller. There are three types of SPT sensors available used
with the 33ZCPLNCTL controller: 33ZCT55SPT space temperature sensor with timed override button, 33ZCT56SPT
space temperature sensor with timed override button and set
point adjustment, and 33ZCT57SPT space temperature sensor
with timed override button, set point adjustment, and manual
fan speed control. See Fig. 8 and 16.
The space temperature sensor is used to measure the build-
ing interior temperature and should be located on an interior
building wall. The sensor wall plate accommodates the NEMA
(National Electrical Manufacturers Association) standard 2 x
4 in. junction box. The sensor can be mounted directly on the
wall surface if acceptable by local codes.
Do not mount the sensor in drafty locations such as near air
conditioning or heating ducts, over heat sources such as baseboard heaters or radiators, or directly above wall-mounted
lighting dimmers. Do not mount the sensor near a window
which may be opened, near a wall corner, or a door. Sensors
mounted in these areas will have inaccurate and erratic sensor
readings.
The sensor should be mounted approximately 5 ft from the
floor, in an area representing the average temperature in the
space. Allow at least 4 ft between the sensor and any corner
and mount the sensor at least 2 ft from an open doorway.
The sensor consists of the following hardware:
1 — sensor top
1 — sensor base
1 — mounting plate
2 — machine screws (6 x 32)
2 — locking screws
Install the sensor as follows (see Fig. 16):
1. Locate the two Allen type screws at the bottom of the
sensor.
2. Turn the two screws clockwise to release the cover from
the sensor wall mounting plate.
3. Lift the cover from the bottom and then release it from
the top fasteners.
4. Feed the wires from the electrical box through the opening in the center of the sensor mounting plate.
5. Usingtwono.6-32x1machinescrews(providedwith
the sensor), secure the sensor to the electrical box.
NOTE: Sensor may also be mounted directly on the wall
using2plasticanchorsand2sheetmetalscrews
(field-supplied).
6. Use 20-gage wire to connect the sensor to the controller.
The wire is suitable for distances of up to 500 ft. Use a
three-conductor shielded cable for the sensor and set
point adjustment connections. The standard CCN communication cable may be used. If the set point adjustment
(slidebar) is not required, then an unshielded, 18-gage or
20-gage, two-conductor, twisted pair cable may be used.
The CCN service jack requires a separate, shielded CCN
communication cable. Always use separate cables
for CCN communication and sensor wiring. (Refer to
Fig. 17-19 for wire terminations.)
7. Replace the cover by inserting the cover at the top of the
mounting plate first, then swing the cover down over the
lower portion. Rotate the two Allen head screws counterclockwise until the cover is secured to the mounting plate
and locked in position.
NOTE: Clean sensor with damp cloth only. Do not use
solvents. See Table 1 for resistance vs temperature data.
Before performing service or maintenance operations on
the system, turn off main power switches to the unit.
Electric shock can cause personal injury.
NOTE: Dimensions are in inches.
Fig. 16 — Space Temperature Sensor and
Wall-Mounted Humidity Sensor Mounting
14
Wiring the Space Temperature Sensor
(33ZCT55SPT,
33ZCT56SPT, 33ZCT57SPT) — The sensor wiring has the
following requirements:
• Power requirements: 18 to 36 vac RMS 50/60 Hz at 4 va.
• All system wiring must be in compliance with all applicable
local and national codes.
• A dedicated power supply is required for this sensor.
• All sensor wiring should be color-coded for ease of mainte-
nance and service.
• Wiring should be 18 to 22 AWG (American Wire Gage)
stranded wire (20 AWG is recommended).
To wire the sensor, perform the following (see Fig. 17-19):
1. Identify which cable is for the sensor wiring.
2. Strip back the jacket from the cables at least 3 inches.
1
Strip
/4-in. of insulation from each conductor. Cut the
shield and drain wire from the sensor end of the cable.
3. Connect the sensor cable as follows:
a. Connect one wire from the cable (RED) to the SPT
terminal on the controller. Connect the other end of
the wire to the left terminal on the SEN terminal
block of the sensor.
b. Connect another wire from the cable (BLACK) to
the GND terminal on the controller. Connect the
other end of the wire to the remaining open terminal on the SEN terminal block (COM on
33ZCT57SPT).
c. On 33ZCT56SPT and 33ZCT57SPT thermostats,
connect the remaining wire (WHITE/CLR) to the
T56 terminal on the controller. Connect the other
end of the wire to the SET terminal on the sensor.
d. In the control box, install a no. 10 ring-type crimp
lug on the shield drain wire. Install this lug under
the mounting screw of the zone controller.
e. On 33ZCT56SPT thermostats, install a jumper
between the two center terminals (right SEN and
left SET). See Fig. 18.
f. On 33ZCT57SPT thermostats, a separate
3-conductor, shielded cable is used to connect the
fan speed wiring. Connect the SPD terminal on the
thermostat to the SPEED terminal on the zone controller. Use the white/clear wire. Connect the COM
terminal on the thermostat to the GND terminal on
the zone controller. Use the black wire. Connect
the 10V terminal on the thermostat to the +10V
terminal on the zone controller. Use the red wire.
In the control box, install a no. 10 ring-type crimp
lug on the fan speed wiring shield drain wire.
Install this lug under the mounting screw of the
zone controller.
Wiring the CCN Communication Service Jack
—See
Fig. 17-19. To wire the service jack, perform the following:
1. Strip back the jacket from the CCN communication
cable(s) at least 3 inches. Strip
1
/4-in. of insulation from
each conductor. Remove the shield and separate the drain
wire from the cable. Twist together all the shield drain
wires and fasten them together using a closed end crimp
lug or a wire nut. Tape off any exposed bare wire to
prevent shorting.
2. Connect the CCN + signal wire(s) (RED) to Terminal 5.
3. Connect the CCN – signal wire(s) (BLACK) to
Terminal 2 .
4. Connect the CCN GND signal wire(s) (WHITE/CLR) to
Terminal 4 .
Before wiring the CCN connection, refer to Connect the
CCN Communication Bus section for communication bus wiring and cable selection. The cable selected must be identical to
the CCN communication bus wire used for the entire network.
The other end of the communication bus cable must be
connected to the remainder of the CCN communication bus. If
the cable is installed as a T-tap into the bus, the cable length
cannot exceed 50 ft. No more than 10 T-taps are allowed
per bus. Wire the CCN service jack of the sensor in a daisy
chain arrangement with other equipment. See Fig. 20. Refer to
the Connect to the CCN Communication Bus section for additional details.
SW1
2
3
SEN
45
61
RED(+)
WHT(GND)
BLK(-)
BLK (GND)
RED (SPT)
CCN COM
SENSOR WIRING
Fig. 17 — Space Temperature Sensor Wiring
(33ZCT55SPT)
2
3
SEN
SW1
Cool Warm
45
61
RED(+)
WHT(GND)
BLK(-)
SET
WHT
(T56)
BLK (GND)
RED (SPT)
CCN COM
SENSOR WIRING
JUMPER
TERMINALS
AS SHOWN
Fig. 18 — Space Temperature Sensor Wiring
(33ZCT56SPT)
15
WHITE (SPEED)
3-CONDUCTOR
SHIELDED CABLE
LEGEND
CCN — Carrier Comfort Network®
SW1 — Switch
Set Point — Set Point Adjust
NOTE: Do not connect white wire to SET terminal if set point adjustment is not needed.
3-CONDUCTOR
SHIELDED CABLE
Fig. 19 — Space Temperature Sensor Wiring (33ZCT57SPT)
Table 1 — Thermistor Resistance vs Temperature Values for Space Temperature Sensor,
Return-Air Temperature Sensor, and Supply-Air Temperature Sensor
TEMP (C) TEMP (F) RESISTANCE (Ohms)
0 32 32,651
5 41 25,395
10 50 19,903
15 59 15,714
20 68 12,494
25 77 10,000
30 86 8,056
35 956,530
40 104 5,325
45 113 4,367
50 122 3,601
16
Wiring when distance between fan coil controller and space temperature sensor is 50 feet or less:
50 FT. MAXIMUM
FAN COIL
PERIMETER
CONTROLLER
3 COND COMM CABLE (TYP)
2 COND TWISTED
CABLE OR 3 COND
CABLE (TEMP
SENSOR WIRING) (TYP)
45KC
FAN COIL UNIT
CCN COMM BUS
Warm
Cool
SPACE
TEMPERATURE
SENSOR
Wiring when distance between fan coil controller and space temperature sensor is greater than 50 feet:
Warm
Cool
CCN COMM BUS
2 COND TWISTED
CABLE OR 3 COND
CABLE (TEMP
SENSOR WIRING) (TYP)
Warm
Cool
SPACE
TEMPERATURE
SENSOR
DISTANCE GREATER
THAN 50 FT.
Fig. 20 — Communication Bus Wiring (42KC Perimeter Fan Coil Zone Controller Shown)
Warm
Cool
17
SUPPLY-AIR TEMPERATURE (SAT) SENSOR INSTALLATION — The SAT sensor is required and must be installed
in the fan coil air outlet. The part number is 33ZCSENSAT.
The SAT sensor probe is 6 inches in length. See Fig. 9.
When using a ducted supply, the supply-air temperature
sensor should be located in the supply duct downstream of the
discharge of the fan coil to allow good mixing of the supply
airstream.
See Fig. 21 for mounting location. See Fig. 22 for mounting
hole requirements.
Disconnect electrical power before wiring the zone controller. Electrical shock, personal injury, or damage to the zone
controller can result.
Do not run sensor or relay wires in the same conduit or
raceway with Class 1 AC service wiring. Do not abrade,
cut, or nick the outer jacket of the cable. Do not pull or
draw cable with a force that may harm the physical or
electrical properties. Avoid splices in any control wiring.
Damage to the 33ZCPLNCTL zone controller can result.
Perform the following steps to connect the SAT sensor to
the zone controller:
1. Locate the opening in the control box. Pass the sensor
probe through the hole.
1
2. Drill or punch a
/2-in. hole in the fan coil unit. See
Fig. 22.
3. Use two field-supplied, self-drilling screws to secure the
sensor probe to the fan coil unit.
4. Connect the sensor leads to the zone controller’s wiring
harness terminal board at the terminals labeled SAT
(RED) and GND (BLK).
Perform the following steps if state or local code requires
the use of conduit, or if sensor installation requires a cable
length of more than 8 ft:
1. Secure the probe to the fan coil unit with two fieldsupplied self-drilling screws.
2. If extending cable length beyond 8 ft, use plenum rated,
20 AWG, twisted pair wire.
3. Connect the sensor leads to the zone controller’s wiring
harness terminal board at the terminals labeled SAT
(RED) and GND (BLK).
4. Neatly bundle and secure excess wire.
INDOOR-AIR QUALITY (CO
) SENSOR INSTALLA-
2
TION — The indoor-air quality (CO2) sensor accessory monitors carbon dioxide levels, which provide information used to
monitor indoor air quality. Three types of sensors are provided.
The wall sensor can be used to monitor the conditioned air
space. Sensors use infrared technology to measure the levels of
CO
present in the air. The wall sensor is available with or
2
without an LCD readout to display the CO
Fig. 11.
level in ppm. See
2
Sensor accessory descriptions and part numbers are shown
in Table 2. To mount the sensor, refer to the installation instructions shipped with the accessory kit.
Table 2 — CO
CO2SENSOR
ACCESSORY
PA RT N U MB ER S
33ZCSENCO2 Wall Mount Sensor (with display)
33ZCT55CO2
33ZCT56CO2
The CO
sensors listed in Table 3 are factory-set for a range
2
Sensor Accessories
2
DESCRIPTION
Wall Mount Sensor with 33ZCT55SPT
space temperature sensor (no display)
Wall Mount Sensor with 33ZCT56SPT
space temperature sensor and set point
adjustment (no display)
of 0 to 2000 ppm and a linear voltage output of 0 to 10 vdc.
Refer to the instructions supplied with the CO
sensor for
2
electrical requirements and terminal locations.
To accurately monitor the quality of the air in the conditioned air space, locate the sensor near a return air grille (if
present) so it senses the concentration of CO
leaving the
2
space. The sensor should be mounted in a location to avoid
direct breath contact.
Do not mount the CO
sensor in drafty areas such as near
2
supply ducts, 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 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 return
airstream.
APROX
2 FT
SUPPLY
DUCT
TYPICAL
FAN COIL UNIT
HC
SUPPLY
AIR SENSOR
LEGEND
HC — Heating Coil
Fig. 21 — Supply Air Temperature Sensor
Mounting Location (42KC)
3.00
1.50
ø0.50
CLEARANCE HOLE
ENGAGEMENT HOLE FOR
#10 SHEET METAL SCREW (2)
Fig. 22 — Supply Air Temperature
Sensor Mounting
18
Indoor-Air Quality Sensor Wiring
— To wire the sensors
after they are mounted in the conditioned air space or outdoor
location, see Fig. 23 and the instructions shipped with the
sensors. For each sensor, use two 2-conductor 18 AWG
twisted-pair cables (unshielded) to connect the separate isolated 24 vac power source to the sensor and to connect the sensor
to the control board terminals. To connect the sensor to the
control board, identify the positive (0-10 VDC) and ground
(SIG COM) terminals on the sensor. Connect the –10 VDC terminal to terminal IAQ and connect the SIG COM terminal to
terminal GND.
RELATIVE HUMIDITY SENSOR (WALL-MOUNTED)
INSTALLATION — The relative humidity sensor accessory
is installed on an interior wall to measure the relative humidity
of the air within the occupied space. See Fig. 12.
Theuseofastandard2x4in.electricalboxtoaccommodate the wiring is recommended for installation. The sensor can
be mounted directly on the wall, if acceptable by local codes.
If the sensor is installed directly on a wall surface, install the
humidity sensor using 2 screws and 2 hollow wall anchors
(field-supplied); do not overtighten screws. See Fig. 16.
Do NOT clean or touch the sensing element with chemical
solvents; they can permanently damage the sensor.
The sensor must be mounted vertically on the wall. The
Carrier logo should be oriented correctly when the sensor is
properly mounted.
DO NOT mount the sensor in drafty areas such as near heating or air-conditioning ducts, open windows, fans, or over heat
sources such as baseboard heaters, radiators, or wall-mounted
light dimmers. Sensors mounted in those areas will produce
inaccurate readings.
Avoid corner locations. Allow at least 4 ft between the
sensor and any corner. Airflow near corners tends to be
reduced, resulting in erratic sensor readings.
Sensor should be vertically mounted approximately 5 ft up
from the floor, beside the space temperature sensor.
For distances up to 500 feet, use a 3-conductor, 18 or
20 AWG cable. A CCN communication cable can be used,
although the shield is not required. The shield must be removed
from the sensor end of the cable if this cable is used. See
Fig. 24 for wiring details.
The power for the sensor is provided by the control board.
The board provides 24 vdc for the sensor. No additional power
source is required.
FRESH
AIR
DAMPER
FAN
ON
FAN A C
LOW
MED
HIGH
24VAC
OAD
RH
GND
IAQ
+10V
SPEED
GND
CONDSW
GND
R
+
W
GND
B
-
+24V DC
SPT
GND
SAT
T56
GND
CNGOVR
RMT/FS
R
W
B
87
21
24VAC
LINE VOLTAGE
SEPARATE
POWER
SUPPLY
REQUIRED
NOT USED
CCN
COMMUNICATIONS
VALV E
DX1
COM
VALV E
DX2
HEAT1
24VAC
HEAT2
Fig. 23 — CO2Sensor Wiring (42KC Controller Shown)
19
CCN
COMMUNICATIONS
24 VAC
EQUIPMENT GROUND
LINE
VOLTAGE
To wire the sensor, perform the following:
1. At the sensor, remove 4-in. of jacket from the cable. Strip
1
/4-in. of insulation from each conductor. Route the cable
through the wire clearance opening in the center of the
sensor.
2. Connect the RED wire to the sensor screw terminal
marked (+).
3. Install one lead from the resistor (supplied with the sensor) and the WHITE wire into the sensor screw terminal
marked (–). After tightening the screw terminal, test the
connection by pulling gently on the resistor lead.
4. Connect the remaining lead from the resistor to the
BLACK wire and secure using a field-supplied closed
end type crimp connector or wire nut.
5. Using electrical tape, insulate any exposed resistor lead to
prevent shorting.
6. At the control box, remove the jacket from the cable.
7. Strip
1
/4-in. of insulation from each conductor.
8. Connect the RED wire to terminal 24 VDC on the control
board.
NOTE: The 24 VDC terminal is used for rh sensor wiring
only.
9. Connect the BLACK wire to terminal GND on the
control board.
10. Connect the WHITE/CLEAR wire to terminal RH on the
control board.
11. Connect shield to earth ground (if shielded wire is used).
HUMIDITY SENSOR
RED
WHITE
BLACK
SHIELD
(IF USED)
+24V DC
RH
SPT
GND
GND
IAQ
SAT
+10V
SPEED
GND
GND
R
+
W
GND
B
-
J1
T56
GND
CNGOVR
RMT/FS
R
W
B
1
2
3
VALVE
DX1
COM
VALVE
DX2
HEAT1
24VAC
HEAT2
FRESH
AIR
DAMPER
FAN
ON
FAN A C
LOW
MED
HIGH
24VAC
OAD
CONDSW
Fig. 24 — Humidity Sensor Wiring (42KC Controller Shown)
+
-
499
NOT USED
CCN
COMMUNICATIONS
CCN
COMMUNICATIONS
24 VAC
LINE
VOLTAGE
EQUIPMENT
GROUND
20
AND SPACE TEMPERATURE SENSORS (Optional) —
CO
2
The CO
and space temperature sensors are comprised of two
2
sensors housed in one unit. They are designed to monitor
carbon dioxide (CO2) levels in the air and measure the interior
building temperature.
Two models are available: P/N 33ZCT55CO2, and
P/N 33ZCT56CO2, which has a set point adjustment potentiometer. Both models include a push-button override that may
be disabled through controller software. See Table 3 for sensor
specifications. To convert the CO
CO
sensor, the duct-mounted aspirator (33ZCASPCO2) will
2
sensor into a duct-mounted
2
NOTE: There are 2 locking screws provided on the bottom of
the cover for security. A special tool is required to remove and
install the cover if the locking screws are used.
The sensor consists of the following hardware:
1 — sensor top
1 — sensor base
1 — mounting plate
2 — machine screws (6 x 32)
2 — locking screws
need to be purchased.
Refer to the instructions supplied with the CO
electrical requirements and terminal locations. The zone
controller requires 24 vac 25 va transformer to provide power
to the sensor.
sensor for
2
Before performing service or maintenance operations on
the system, turn off main power switches to the unit.
Electric shock can cause personal injury.
IMPORTANT: The CO2and space temperature sensor
should be wall-mounted in the occupied space to accurately measure the ventilation delivered to that zone.
Do NOT mount the sensor in the return air duct.
Table 3 — Performance Specification (P/N 33ZCT55CO2 and 33ZCT56CO2)
FEATURE SPECIFICATION
Sensing Method Single Beam Absor ption Infrared™
Sample Method Diffusion
Measurement Range 0to2000ppm
Sensitivity ± 20 ppm
Accuracy ± 100 ppm
Pressure Dependency 0.13% of reading per mmHg
Response Time 0 to 90% Step Change <2 minutes
Warm-Up Time at 77 F (25 C) <2 minutes
Operating Conditions 32 to 122 F (0° to 50 C)
Storage Temperatures –4 to +158 F (–20to70C)
Agency Certification FCC Part 15 Class B/CE/CA Energy Commission
Calibration/Interval Lifetime self-calibrating after 14 days of run time.*
Power 18-30 vac RMS, 50/60 Hz —halfwave rectified (dedicated)
Analog CO
Temperature Sensor 10 KΩ Thermistor, 10 KΩ ± 2.5% at 77 F (25 C)
Temperature Control (P/N 33ZCT56CO2 only) Equipped with a slide potentiometer.
Override Control Equipped with a push button that, when depressed, shorts out its internal thermistor.
Reliability Meets applicable Carrier reliability requirements
KΩ — Kilo-ohm (1000 ohms)
RH — Relative Humidity
RMS — Root Mean Square
TEMA — Time Extended Measurement
Output 4-20 mA (Rlmax = 500 Ohms) and 0-10 V(Source 100 mA, Sink 10 mA)
2
LEGEND *Automatic background calibration (ABC Logic™) is a patented self-
Patented TEMA self calibration software and 10K temperature sensor
60 to 90 F: 760 mmHg (15 to 32 C)
0to99% RH, non-condensing
18-42 VDC polarity protected (dedicated)
1.75 VA maximum average power
2.75 VA peak power
Positions Resistance
Left (Stop) 0 K(+5 K)
Right (Stop) 100 K±10 K
calibration procedure that is designed to be used in applications where
CO
concentrations will drop to outdoor ambient conditions (approxi-
2
mately 400 ppm) at least 3 times in a 14-day period (typically during
unoccupied periods).
21
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