Carrier 33ZCVAVTRM Spezifikationen PDF herunterladen (Seite 8)

• actuator preassembled to housing

• capable of demand controlled ventilation

• capable of individual zone pressure control for individ-

ual supply and exhaust control in conjunction with sec-

ondary terminal controller (required)

• easy access to airflow sensor pneumatic connections

• capable of high-speed 38.4 kilobaud communications

network operation

• 128 controller maximum system (must be located on

same Carrier communicating network bus segment)

• capable of zone humidity control (dehumidification)

• Carrier Linkage System compatibility

• global set point and occupancy scheduling

• capable of local set point adjustment with field-installed

temperature sensor (with temperature offset)

• both controller housing and actuator are UL94-5V ple-

num rated

The zone controller is a single duct or fan powered, variable

air volume (VAV) terminal control with a factory-integrated ac-

tuator. The zone controller maintains precise temperature con-

trol in the space 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 reheat, ducted heat, or non-ducted supplemental

heat. The zone controller can support two-position hot water,

modulating hot water, or up to 3-stage electric heat.

With the addition of a secondary exhaust or return air termi-

nal and the 33ZCSECTRM controller, zone pressurization

applications can be supported.

Supply and exhaust airflow control is provided on an

individual zone basis in order to maintain the desired zone

pressure.

The 33ZCSECTRM in conjunction with the fan terminal

zone controller are used to provide control for constant volume

dual duct applications.

When linked to a Carrier Linkage System, the zone control-

ler provides numerous features and benefits such as weighted

average demand for system operation, intelligent supply air

temperature reset, set point averaging, global set point sched-

ule, and occupancy scheduling. Duct static pressure reset for

the air source is provided, based on terminal requirements.

The zone controller provides additional control features

such as Occupied/Unoccupied scheduling initialized via the

network. The zone controller offers override invoked from a

wall sensor during unoccupied hours from 1 to 1440 minutes in

1-minute increments. Optional indoor air quality (IAQ) or rela-

tive humidity monitoring and control are also available.

The zone controller assembly contains an integral VAV ac-

tuator that is field mounted to the VAV terminal damper shaft,

similar to the mounting of a standard actuator. The actuator is

rated at 35 in.-lb (3.95 Nm) torque, a 90-degree stroke, and

provides a 90-second nominal running time at 60 Hz. The actu-

ator is suitable for mounting onto a

-in. (9.5 mm) square or

round damper shaft, or onto a

-in. (13 mm) round damper

shaft. The minimum damper shaft length is 1

in. (45 mm).

The zone controller is designed for vertical or horizontal

mounting.

The zone controller is provided with removable connectors

for power and communications. The zone controller has non-

removable screw type connectors for inputs. The removable

connectors are designed so that they can be inserted one

way so as to prevent installation errors. The zone controller

also provides an RJ-11 modular phone jack for the Network

Service tool connection to the module via the Carrier network

communications.

An optional conduit box cover (Part Number

33ZCCONBOX) allows field wiring connection via conduit.

The conduit box is designed to accept two

-in. (13 mm)

EMT (Electrical Metal Tubing) conduits.

The 33ZCFANTRM is designed to allow a service person

or building owner to configure and operate the unit through the

Carrier proprietary network user interfaces. A user interface is

not required for day-to-day operation. All maintenance, config-

uration, setup, and diagnostic information is available through

the Level II communications port to allow data access by an at-

tached computer running Network Service Tool, Comfort-

VIEW

, or ComfortWORKS

software.

WIRING CONNECTIONS — Field wiring is 18 to 22 AWG

(American Wire Gage). The zone controller is a NEC (National

Electrical Code) Class 2 rated device.

INPUTS

• space temperature sensor

• primary air damper position (factory-installed)

• airflow sensor (factory installed)

• field-installed remote wall sensor set point adjustment

• optional supply temperature sensor (required for ducted

heat and supply air monitoring)

• optional primary air temperature sensor (one per system

is required for systems which do not utilize a linkage

compatible air source)

• optional IAQ sensor or relative humidity sensor

• optional secondary airflow (zone pressure or dual duct)

• optional remote occupancy contact

OUTPUTS

• internally factory-wired damper actuator

• heating (ducted or non-ducted)

— modulating (floating) heat

— up to 3 stages of electric heat

— two-position heat

• fan start/stop

• secondary damper actuator

POWER SUPPLY — The 33ZCFANTRM requires a 24 vac

± 10% power source rated at 40 va (50/60 Hz).

POWER CONSUMPTION — The power requirement siz-

ing allows for accessory water valves and for the fan contactor.

Water valves are limited to 8 va on both two-position and

modulating hot water. The fan contactor is limited to 11 va

(holding).

NOTE: If a water valve or fan contactor exceeds these limits,

or external contactors are required for electric heat, then it is

recommended a 60 va transformer be used. The maximum rat-

ing for any output is 20 va.

ACCURACY — Terminal airflow (nominal cfm) is rated at

1 in. wg (249 kPa) measured velocity pressure. The zone con-

troller is capable of controlling to as low as 10% or as high as

125% of nominal airflow with an accuracy of ± 3% (nominal)

at any point within the range.

HARDWARE (MEMORY)

FLASH EPROM

DIFFERENTIAL PRESSURE RANGE — 0 to 2.0 in. wg

(0 to 498 kPa) maximum for the onboard flow sensor.

SPECIFIED SENSING TEMPERATURE RANGE — The

zone controller space temperature, supply temperature, and pri-

mary air temperature sensing range is –40 to 245 F (–40 to

118 C). The zone controller has an allowable control set point

range from 40 to 90 F (4 to 32 C) for heating and 45 to 99 F

(7 to 37 C) for cooling.

COMMUNICATIONS — The number of controllers is limit-

ed to 128 zones maximum, with a limit of 8 systems (Linkage

Coordinator configured for at least 2 zones). Bus length may

not exceed 4000 ft (1219 m), with no more than 60 devices on

any 1000 ft (305 m) section. Optically isolated RS-485 repeat-

ers are required every 1000 ft (305 m).

At 19,200 and 38,400 baud, the number of controllers is

limited to 128 maximum, with no limit on the number of Link-

age Coordinators.

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