VVVVTT ZZoonnee CCoonnttrroolllleerr
IInnssttaallllaattiioonn aanndd SSttaarrtt--uupp GGuuiiddee
CARRIER CORPORATION ©2011
A member of the United Technologies Corporation family · Stock symbol UTX · Catalog No. 11-808-435-01 · 6/20/2011
Table of Contents
Introduction .................................................................................................................................................................. 1
What is a VVT Zone Controller? .......................................................................................................................... 1
Specifications ........................................................................................................................................................ 3
Safety Considerations .......................................................................................................................................... 5
Installation ................................................................................................................................................................... 6
Field-supplied hardware ...................................................................................................................................... 6
Mounting the VVT Zone Controller ..................................................................................................................... 7
To mount the controller ........................................................................................................................ 7
Wiring the VVT Zone Controller for power ......................................................................................................... 8
To wire the controller for power ............................................................................................................ 9
To address the VVT Zone Controller ................................................................................................................... 9
Wiring the VVT Zone Controller to the MS/TP network ............................................................................... 10
Wiring specifications ........................................................................................................................... 10
To wire the controller to the network ................................................................................................. 10
Wiring sensors to inputs ................................................................................................................................... 11
Wiring an SPT sensor .......................................................................................................................... 12
Rnet wiring specifications ........................................................................................................ 12
To wire the SPT sensor to the controller ................................................................................. 13
Wiring a T55 space temperature sensor ........................................................................................... 14
Wiring specifications ................................................................................................................ 14
To wire the T55 sensor to the controller ................................................................................. 14
Wiring a Supply Air Temperature sensor ............................................................................................ 15
Wiring specifications ................................................................................................................ 15
To wire the SAT sensor to the controller ................................................................................. 15
Wiring a Duct Air Temperature sensor ............................................................................................... 16
Wiring specifications ................................................................................................................ 16
To wire the DAT sensor to the controller ................................................................................. 16
Wiring a CO2 sensor ............................................................................................................................ 17
Wiring specifications ................................................................................................................ 17
To wire the CO2 sensor to the controller ................................................................................ 17
Wiring a Relative Humidity sensor ..................................................................................................... 19
Wiring specifications ................................................................................................................ 19
To wire the RH sensor to the controller................................................................................... 20
Wiring a remote occupancy sensor .................................................................................................... 20
Wiring specifications ................................................................................................................ 21
Wiring equipment to outputs ........................................................................................................................... 21
Wiring specifications ........................................................................................................................... 21
Wiring diagram legend ........................................................................................................................ 22
Single duct only ................................................................................................................................... 22
Single duct 2-position hot water ......................................................................................................... 23
Single duct modulating hot water ...................................................................................................... 23
Single duct combination base board and ducted heat ..................................................................... 24
Single duct 2-stage electric heat ........................................................................................................ 24
Fan box 2-position hot water .............................................................................................................. 25
Fan box modulating hot water - ducted or baseboard ...................................................................... 25
Fan box combination baseboard and ducted heat ........................................................................... 26
Fan box 2-stage electric heat ............................................................................................................. 26
Wiring field-supplied actuators to the analog output ........................................................................ 27
High-torque actuators .............................................................................................................. 27
Linked actuators ....................................................................................................................... 28
VVT Zone Controller i
Table of Contents
Start-up ....................................................................................................................................................................... 29
Configuring the VVT Zone Controller's properties ......................................................................................... 29
Unit Configuration properties ............................................................................................................. 30
Setpoint properties.............................................................................................................................. 30
Service Configuration properties ........................................................................................................ 33
Linkage properties .............................................................................................................................. 34
Performing system checkout ........................................................................................................................... 35
Commissioning the VVT Zone Controller ........................................................................................................ 36
Balancing the system ........................................................................................................................................ 36
Step 1: Prepare for balancing ............................................................................................................ 37
Step 2: Balance each zone ................................................................................................................ 37
Step 3: Set the system static pressure ............................................................................................. 38
Sequence of operation .............................................................................................................................................. 40
Temperature sensors ........................................................................................................................................ 40
Zone airflow control ........................................................................................................................................... 41
Zone reheat control ........................................................................................................................................... 42
Demand control ventilation (DCV) and dehumidification using optional sensors ................................... 43
Occupancy ........................................................................................................................................................... 44
Alarms ................................................................................................................................................................. 45
Demand limiting ................................................................................................................................................ 46
Linkage ................................................................................................................................................................ 46
Air source mode determination....................................................................................................................... 47
Troubleshooting ......................................................................................................................................................... 48
LED's .................................................................................................................................................................... 48
Serial number ..................................................................................................................................................... 49
Replacing the VVT Zone Controller's battery ................................................................................................. 49
Compliance ................................................................................................................................................................ 50
FCC Compliance ................................................................................................................................................. 50
CE Compliance ................................................................................................................................................... 50
BACnet Compliance........................................................................................................................................... 50
Appendix A: VVT Zone Controller Points/Properties .............................................................................................. 51
Status................................................................................................................................................................... 51
Unit Configuration .............................................................................................................................................. 52
Setpoints ............................................................................................................................................................. 53
Alarm Configuration .......................................................................................................................................... 58
Service Configuration ........................................................................................................................................ 60
Maintenance ....................................................................................................................................................... 63
Alarms ................................................................................................................................................................. 65
Linkage ................................................................................................................................................................ 65
I/O Points ............................................................................................................................................................ 67
Appendix B: VVT terminal modes ............................................................................................................................ 69
Index ........................................................................................................................................................................... 71
ii VVT Zone Controller
VVT Zone
(OPN-VVTZC)
VVT Zone
(OPN-VVTZC)
VVT Zone
(OPN-VVTZC)
VVT Zone
(OPN-VVTZC)
VVT Bypass
(OPN-VVTBP)
MANUAL ON WARMER
Occupied
INFO COOLER
F
MANUAL ON WARMER
Occupied
INFO COOLER
F
MANUAL ON WARMER
Occupied
INFO COOLER
F
MANUAL ON WARMER
Occupied
INFO COOLER
F
Introduction
What is a VVT Zone Controller?
The VVT Zone Controller (#OPN-VVTZC), a component of the i-Vu Open Control System, controls zone
®
temperature in single duct, fan powered, Variable Volume and Temperature (VVT
) applications. The VVT
Zone Controller with built-in actuator maintains zone temperature by operating the terminal fan and
regulating the flow of conditioned air into the space. Buildings with diverse loading conditions can be
supported by controlling the air source heating and cooling sources or supplemental heat. The VVT Zone
Controller provides dedicated control functions for single duct and fan box terminals with modulating heat, up
to 2 stages of ducted heat, or combination baseboard and ducted heat.
The i-Vu Open Control System uses linkage to exchange data between the zone terminals and their air source
to form a coordinated HVAC system. The system's air source controller, zone controllers, and bypass controller
are linked so that their data exchange can be managed by one zone controller configured as the VVT Master.
The following illustration shows the VVT Zone Controller in a typical i-Vu Open Control System.
VVT Zone Controller 1
Introduction
0
134
5
2
78
9 6
0
134
5
2
78
9 6
HWV
Gnd
Analog
Output
Gnd
T55 (Opt)
RH/CO2
Gnd
SAT
Gnd
REMOTE
LED
Gnd
Rnet +
Rnet -
+12V
R n e t
BACnet Power
On
4
3
2
1
-
+
Batt
CR2032
10's
1's
Thermistor
T55 (Opt)
RH/CO2
Factory Defaults
Rnet
MSTP
Output
24V Max,
1A Max
Conductors Only
Class 2
Use Copper
26Vdc, 0.1A, 3W
14VA, 0.58A
24Vac , 50- 60 H z
This produ c t w as des ign ed
CAUTION:
to be moun t ed inside the
building envelope.Warranty
voided if mounted outside.
Interconnect the Outputs of
Diff er en t Cl ass 2 Circuits.
To ReduceThe Risk of Fire
or Electric Shock, Do Not
CAUTION:
BACnet
VVT Zone
®
AO: 0-10 Vdc
5mA Max
Local
Access
Short pins
Enable SAT
Enable SAT and REM O TE
CW CCW
Motor
Error
Run
Power
0-5Vdc
Made in USA
Inputs
TxRx
MSTP Baud
76.8k38.4k19.2k9600
Damper release bu t t on inside
TYPE: 002101
E143900
88FO
Enclosed Ener gy
Managemen t Equipment
R
Net +
Net -
Shield
Ground
24V ac
Rnet+
Sense
+12V
Rnet-
Gnd
FAN
Power for B. O.s
BUS
HEAT1
HEAT2
(OPN-VVTZC)
BT485
NOTE This document gives instructions for field-installation of a VVT Zone Controller in an i-Vu Open Control
System. However, VVT Zone Controllers are available factory-mounted to Carrier’s round and rectangular
dampers. Damper assemblies have an integrated duct temperature sensor.
2 VVT Zone Controller
Specifications
Driver drv_vvtopen
Maximum number of control
1
programs
Power 24 Vac ±10%, 50–60 Hz
14 VA power consumption (20 VA with BACview
26 Vdc (25 V min, 30 V max)
Single Class 2 source only, 100 VA or less
BACnet port
Rnet port
For communication with the controller network using MS/TP (9600 bps, 19.2
kbps, 38.4 kbps, or 76.8 kbps)
For SPT sensors and a BACview
a daisy-chain configuration:
• 1 SPT Plus or SPT Pro
• 1–4 SPT Standards
• 1–4 SPT Standards, and 1 SPT Plus or SPT Pro
• Any of the above combinations, plus a BACview
devices total
Local Access port
For system start-up and troubleshooting using Field Assistant or BACview
(115.2 kbps)
Inputs
4 inputs for connecting the following types of sensors:
• An alternate space temperature sensor (#33ZCT55SPT)
• Supply air temperature sensor (#33ZCSENSAT)
• Duct air temperature sensor (#33ZCSENDAT)
• CO2 sensor (#33ZCSENCO2)
• Relative humidity sensor (#33ZCSENSRH-01 [indoor space] or
33ZCSENDRH-01 [duct])
• Remote occupancy sensor
Input resolution 10 bit A/D
attached)
6
in any of the following combinations, wired in
6,
but no more than 6
6
Digital outputs 3 digital outputs, relay contact rated at 1 A max. @ 24 Vac/Vdc. Configured
normally open.
Analog output 1 analog output, 0–10 Vdc (5 mA max). The controlled device must have a
minimum of 2000 Ohms resistance measured from its input to ground and
must share the same ground as the controller.
Output resolution 8 bit D/A
Integral actuator Brushless DC motor, torque 35 inch-pounds (4 Nm), runtime 205 seconds for
90 degree travel during control, or 25 seconds in high-speed test and balance
mode
Battery 10-year Lithium CR2032 battery provides a minimum of 10,000 hours of data
retention during power outages
Protection Incoming power and network connections are protected by non-replaceable
internal solid-state polyswitches that reset themselves when the condition that
causes a fault returns to normal. The power, network, input, and output
connections are also protected against voltage transient and surge events.
BT485 connector You attach a BT485 (not included) to a controller at the beginning and end of
a network segment to add bias and to terminate a network segment.
VVT Zone Controller 3
Introduction
Status indicators LED's indicate status of communications, running, errors, power, and digital
outputs
Environmental operating
0 to 130° F (-18 to 54°C), 0 to 90% relative humidity, non-condensing
range
Storage temperature range -24 to 140°F (-30 to 60°C), 0 to 90% relative humidity, non-condensing
Physical UL94-5VA plenum rated enclosure for installation in plenum (or other space
for environmental air) in accordance with NEC Section 300.22 (c) and (d)
Overall dimensions A:
B:
C:
Mounting dimensions D:
E:
F:
G:
H:
7 in. (17.8 cm)
6-1/32 (15.4 cm)
6 in. (15.24 cm)
5-5/8 in. (14.3 cm)
4-9/16 in. (24.3 cm)
1-5/16 in. (3.3 cm.)
7/8 in. (2.2 cm)
1-5/16 in. (3.3 cm)
Panel depth 2-1/2 in. (6.4 cm) minimum
Shaft dimension Minimum shaft diameter: 3/8 in. (.95 cm.)
Maximum shaft diameter: 1/2 in. (1.27 cm)
Minimum shaft length: 1 3/4 in. (4.45 cm)
Weight 1.7 lbs (0.77 kg)
BACnet support Conforms to the Advanced Application Controller (B-AAC) Standard Device
Profile as defined in ANSI/ASHRAE Standard 135-2004 (BACnet) Annex L
Listed by UL-916 (PAZX), cUL-916 (PAZX7), FCC Part 15-Subpart B-Class A, CE
EN50082-1997
4 VVT Zone Controller
Safety Considerations
SAFETY NOTE
Air conditioning 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 judgment should be used in applying any manufacturer's instructions to avoid injury to personnel or
damage to equipment and property.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal injury, death, and/or equipment damage.
Disconnect all power to the unit before performing maintenance or service. Unit may automatically start if
power is not disconnected.
Follow all local, state, and federal laws regarding disposal of equipment containing hazardous materials
such as mercury contactors.
VVT Zone Controller 5
Installation
Installation
To install the VVT Zone Controller:
1 Mount the controller to the VVT box. (page 7)
2 Wire the controller for power. (page 8)
3 Set the controller's address. (page 9)
4 Wire the controller to the MS/TP network. (page 10)
5 Wire sensor(s) to the controller. (page 11)
6 Wire equipment to the controller's outputs. (page 21)
Field-supplied hardware
Each zone controller installation requires the following field-supplied components:
• zone terminal unit
• round or rectangular mounting bracket
• space temperature sensor
• supply air temperature sensor
• 4x2-in. electrical box
• transformer— 24 Vac, 40 VA
• two no. 10 x 1/2-in. sheet metal screws (to secure SAT sensor to duct)
• two no. 6-32 x 5/8-in. screws (to mount space temperature sensor base to electrical box)
• wiring
• bushings (required when mounting SAT sensor in a duct 6-in. or less in diameter)
Optional:
• contactors (if required for fan or electric heat)
• indoor air quality sensor
• relative humidity sensor
• 2 screws and 2 hollow wall anchors (to mount relative humidity sensor directly to wall)
• valve and actuator for hot water heat (if required)
6 VVT Zone Controller
End view inle t
Controller
Allow 1 ft. (.3 m) clea rance
for service access
2.5 in.
(6.35
cm)
Damper ShaftVVT Box
Controller
Anti-rotation slot
O-ring Bushing
Anti-rotation slot
Mounting the VVT Zone Controller
Mount the VVT Zone Controller on the zone terminal’s damper actuator shaft. For service access, allow at
least 1 foot (.3 m) of clearance between the front of the controller and adjacent surfaces.
To mount the controller
1 Turn the damper shaft to fully close the damper.
2 Remove the controller’s cover.
3 Mount the controller to the VVT box by sliding the clamp assembly onto the damper shaft.
4 Secure the controller by installing the screw provided through the anti-rotation slot's bushing and o-ring.
NOTE Center the bushing in the slot. Failure to do so may cause the actuator to stick or bind.
5 Hold down the controller’s damper release button and rotate the actuator clamp in the same direction
that closed the damper. Rotate the clamp until it stops, then rotate it back one notch.
VVT Zone Controller 7
Installation
Damper
release
button
5/8-in. nuts
Move stop
clamp if
necessary
6 Release the button.
7 Tighten the actuator clamp to the damper shaft by tightening the two 5/16 inch nuts.
8 Hold down the damper release button and rotate the damper from fully closed to fully open. If the
damper traveled less than 90 degrees, do the following to set the actuator's fully open position:
a) Loosen the appropriate stop clamp screw. See figure below.
b) Move the stop clamp until it contacts the
edge of the actuator cam.
c) Tighten the screw.
9 Hold down the damper release button, rotate the damper to verify that it fully opens and closes, then
release the button.
Wiring the VVT Zone Controller for power
The VVT Zone Controller is powered by a Class 2 power source. Take appropriate isolation measures when
mounting it in a control panel where non-Class 2 circuits are present.
8 VVT Zone Controller
Carrier controllers can share a power supply as long as you:
• Maintain the same polarity
• Use the power supply only for Carrier Open controllers
10's
1's
1
3
4
5
2
7
8
9
6
0
1
3
4
5
2
7
8
9
6
0
To wire the controller for power
1 Remove power from the power supply.
2 Pull the screw terminal connector from the controller's power terminals labeled Gnd and 24 Vac or Hot.
3 Connect the transformer wires to the screw terminal connector.
4 Apply power to the power supply.
5 Measure the voltage at the VVT Zone Controller’s power input terminals to verify that the voltage is within
the operating range of 21.6–26.4 Vac.
6 Connect a 4-inch (10.2 cm) wire from Gnd to the control panel.
7 Insert the screw terminal connector into the VVT Zone Controller's power terminals.
8 Verify that the Power LED is on and the Run LED is blinking.
To address the VVT Zone Controller
You must give the VVT Zone Controller an address that is unique on the network. You can address the VVT
Zone Controller before or after you wire it for power.
1 If the VVT Zone Controller has been wired for power, pull the screw terminal connector from the
controller's power terminals labeled
apply power to it.
2 Using the rotary switches, set the controller's address. Set the Tens (10's) switch to the tens digit of the
address, and set the
Ones (1's) switch to the ones digit.
EXAMPLE If the controller’s address is 25, point the arrow on the Tens (10's) switch to 2 and the arrow
on the
Ones (1's) switch to 5.
CAUTION The factory default setting is "00" and must be changed to successfully install your VVT Zone
Controller.
VVT Zone Controller 9
Gnd and 24 Vac. The controller reads the address each time you
Installation
Wiring the VVT Zone Controller to the MS/TP network
The VVT Zone Controller communicates using BACnet on an MS/TP network segment communications at
9600 bps, 19.2 kbps, 38.4 kbps, or 76.8 kbps.
Wire the controllers on an MS/TP network segment in a daisy-chain configuration.
Install a BT485 on the first and last controller on a network segment to add bias and prevent signal
distortions due to echoing.
See the MS/TP Networking and Wiring Installation Guide for more details.
Wiring specifications
Cable: 22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
Maximum length: 2000 feet (610 meters)
To wire the controller to the network
1 Pull the screw terminal connector from the controller's power terminals labeled Gnd and 24 Vac or Hot.
2 Check the communications wiring for shorts and grounds.
3 Connect the communications wiring to the BACnet port’s screw terminals labeled Net +, Net -, and
Shield.
NOTE Use the same polarity throughout the network segment.
4 Verify that the MSTP jumper is set to MSTP.
10 VVT Zone Controller
5 Set DIP switches 1 and 2 to the appropriate baud rate. See the MSTP baud diagram on the VVT Zone
Controller. The default baud rate is 76.8 kbps.
NOTE Use the same baud rate for all controllers on the network segment.
6 Insert the power screw terminal connector into the VVT Zone Controller's power terminals.
7 Verify communication with the network by viewing a module status report.
Wiring sensors to inputs
You can wire the following sensors to the VVT Zone Controller's inputs:
• Space temperature sensor (page 12)
• Alternate space temperature sensor (page 14)
• Supply Air Temperature sensor (page 15)
• Duct Air Temperature sensor (page 16)
• CO
sensor
2
• Relative Humidity sensor (page 19)
• Remote occupancy contact sensor (page 20)
NOTE This document gives instructions for wiring the sensors to the VVT Zone Controller. For mounting and
wiring the sensors, see the Carrier Sensors Installation Guide.
Disconnect electrical power to the VVT Zone Controller before wiring it. Failure to follow this warning could
cause electrical shock, personal injury, or damage to the controller.
• Do not run sensor or relay wires in the same conduit or raceway with Class 1 AC or DC 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.
VVT Zone Controller 11
Installation
Sensor
Part #
Features
SPT Standard
SPT Plus
•
SPT Pro
•
Wiring an SPT sensor
The VVT Zone Controller is connected to a wall-mounted space temperature sensor to monitor room
temperature.
An i-Vu Open Control System offers the following SPT sensors:
SPS
• Local access port
• No operator control
SPPL
Slide potentiometer to adjust setpoint
• MANUAL ON button to override schedule
• LED to show occupied status
• Local access port
SPP
LCD display
• MANUAL ON button to override schedule
• WARMER and COOLER buttons to adjust setpoint
• INFO button to cycle through zone and outside air temperatures,
setpoints, and local override time
• Local access port
You wire SPT sensors to the VVT Zone Controller's Rnet port. An Rnet can consist of any of the following
combinations of devices wired in a daisy-chain configuration:
• 1 SPT Plus or SPT Pro
• 1–4 SPT Standards
• 1–4 SPT Standards, and 1 SPT Plus or SPT Pro
6
• Any of the above combinations, plus up to 2 BACview
's but no more than 6 devices total
NOTES
• If you have 2 BACview
6
's, the second BACview6 must have a separate power supply with the same
ground as the controller.
• If the Rnet has multiple SPT Standard sensors, you must give each a unique address on the Rnet. See
the Carrier Sensors Installation Guide.
• If the Rnet has multiple BACviews, you must give each a unique address on the Rnet. See the BACview
Installation and User Guide.
Rnet wiring specifications
NOTE Use the specified type of wire and cable for maximum signal integrity.
Description 4 conductor, unshielded, CMP, plenum rated cable
Conductor 18 AWG
Maximum length 500 feet (152 meters)
Recommended coloring Jacket: White
Wiring: Black, white, green, red
UL temperature rating 32–167°F (0–75°C)
12 VVT Zone Controller
Outer Jacket
Inner insulation
.25 in.
(.6 cm)
Connect this wire...
To this terminal...
Voltage 300 Vac, power limited
Listing UL: NEC CL2P, or better
To wire the SPT sensor to the controller
1 Partially cut, then bend and pull off the outer jacket of the Rnet cable(s). Do not nick the inner insulation.
Strip about .25 inch (.6 cm) of the inner insulation from each wire.
2 Wire each terminal on the sensor to the same terminal on the controller. See diagram below.
NOTE Carrier recommends that you use the following Rnet wiring scheme:
Red
Black
White
Green
3 Verify that the Rnet jumper is set to Rnet.
+12V
Rnet-
Rnet+
Gnd
VVT Zone Controller 13
Installation
Wiring a T55 space temperature sensor
Part #33ZCT55SPT
This wall-mounted sensor monitors space temperature and can be used instead of an SPT sensor.
Wiring specifications
Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded
If >100 ft (30.5 meters) 22 AWG, shielded
Maximum length: 500 feet (152 meters)
To wire the T55 sensor to the controller
1 Strip the outer jacket from the cable for at least 3 inches (7.62 cm). Strip .25 inch (.6 cm) of insulation
from each wire. Cut the shield and drain wire from the cable.
2 Wire the sensor to the controller, attaching the red wire to the T55 (Opt) terminal and the black wire to
the
Gnd terminal. See diagram below.
3 Verify that the T55 (Opt) jumper is in the Thermistor position.
14 VVT Zone Controller
Wiring a Supply Air Temperature sensor
Part #33ZCSENSAT
The VVT Zone Controller requires a temperature sensor installed in the supply air stream. The Supply Air
Temperature (SAT) sensor is used when the zone controller is equipped with ducted heating.
Wiring specifications
Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded
Maximum length: 500 feet (152 meters)
To wire the SAT sensor to the controller
If >100 ft (30.5 meters) 22 AWG, shielded
1 Wire the sensor to the controller. See diagram below.
2 Verify that the Enable SAT jumper is on.
3 Verify that the Enable SAT and REMOTE jumper is in the left position.
VVT Zone Controller 15
Installation
Wiring a Duct Air Temperature sensor
Part #33ZCSENDAT
The Duct Air Temperature Sensor (DAT) monitors the supply air temperature and is required for cooling and
heating air source applications on non-Carrier dampers and for stand-alone operation without ducted reheat.
Wiring specifications
Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded
If >100 ft (30.5 meters) 22 AWG, shielded
Maximum length: 500 feet (152 meters)
To wire the DAT sensor to the controller
1 Wire the sensor to the controller. See diagram below.
NOTE Sensor wiring does not have polarity. The wires can be connected to either terminal.
2 Using electrical tape, insulate any exposed wire to prevent shorting.
3 Connect shield to earth ground (if using shielded wire to extend cable length).
4 Verify that the Enable SAT jumper is on.
5 Verify that the Enable SAT and REMOTE jumper is in the left position.
16 VVT Zone Controller
Wiring a CO2 sensor
Part #33ZCSPTCO2LCD-01 (Display model)
Part #33ZCSPTCO2-01 (No display)
Part #33ZCT55CO2 (No display)
A CO
sensor monitors carbon dioxide levels. As CO2 levels increase, the VVT Zone Controller adjusts the
2
outside air dampers to increase ventilation and improve indoor air quality. These sensors also monitor
temperature using a 10K thermister.
A CO
sensor can be wall-mounted or mounted in a return air duct. (Duct installation requires an Aspirator
2
Box Accessory - Part #33ZCASPCO2.)
The sensor has a range of 0–2000 ppm and a linear 4-20 mA output. This is converted to 1-5 Vdc by a 250
Ohm, 1/4 watt, 2% tolerance resistor connected across the zone controller's CO2 input terminals.
NOTE Do not use a relative humidity sensor and CO2 sensor on the same zone controller.
Wiring specifications
Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded
Maximum length: 500 feet (152 meters)
To wire the CO2 sensor to the controller
#33ZCSPTCO2
1 Wire the sensor to the controller. See appropriate diagram below.
2 Verify that the RH/CO2 jumper is set to 0-5Vdc on the VVT Zone Controller.
3 Verify the J7 jumper on the sensor is set to 0-5Vdc.
If >100 ft (30.5 meters) 22 AWG, shielded
VVT Zone Controller 17
Installation
Wiring diagram for #33ZCSPTCO2:
#33ZCT55CO2
1 Wire the sensor to the controller. See appropriate diagram below.
2 Install a field supplied 250 Ohm 1/4 watt 2% tolerance resistor across the controller's RH/CO2 and Gnd
terminals.
3 Verify that the RH/CO2 jumper is set to 0-5Vdc on the VVT Zone Controller.
18 VVT Zone Controller
Wiring diagram for #33ZCT55CO2:
Wiring a Relative Humidity sensor
Part #OPNSENSRH-01
The Relative Humidity (RH) sensor is used for zone humidity control (dehumidification) if the rooftop unit has
a dehumidification device. If not, the sensor only monitors humidity.
NOTE Do not use a relative humidity sensor and CO2 sensor on the same zone controller.
Wiring specifications
Cable from sensor to controller: If <100 ft (30.5 meters) 22 AWG, unshielded
Maximum length: 500 feet (152 meters)
If >100 ft (30.5 meters) 22 AWG, shielded
VVT Zone Controller 19
Installation
To wire the RH sensor to the controller
1 Strip the outer jacket from the cable for at least 4 inches (10.2 cm). Strip .25 inch (.6 cm) of insulation
from each wire.
2 Wire the sensor to the controller. See diagram below.
3 Using electrical tape, insulate any exposed resistor lead to prevent shorting.
4 Verify that the RH/CO2 jumper is set to 0-5Vdc.
5 Set SW3 on the sensor as shown below.
Wiring a remote occupancy sensor
You can wire a normally open or normally closed dry-contact occupancy sensor to the VVT Zone Controller's
REMOTE input as shown below. The controller supplies the 24 Vac needed for the input.
20 VVT Zone Controller
Loading...