Carrier 33ZCSECTRM Specifikace stáhnout pdf (Strana 2)

CONTENTS (cont)

Page

Series Fan Terminal Applications

. . . . . . . . . . . . . . . . 23

• COOLING

• HEATING

• COOLING WITH FAN

• STAGED ELECTRIC HEAT

• HOT WATER OR STEAM HEAT

Parallel Fan Terminal Applications

. . . . . . . . . . . . . . 25

• COOLING

• HEATING

• COOLING ONLY

• STAGED ELECTRIC HEAT

• HOT WATER HEAT

Static Pressure Reset

. . . . . . . . . . . . . . . . . . . . . . . . . . . 29

• OVERVIEW

•OPERATION

Indoor Air Quality (IAQ) Control

. . . . . . . . . . . . . . . . . 29

Secondary Zone Controller (33ZCSECTRM)

. . . . . 29

Zone Pressure Control (Terminal Tracking)

. . . . . . 33

• GENERAL

• LIMITATIONS

• TERMINAL TRACKING

Dual Duct Terminal Applications

. . . . . . . . . . . . . . . . 34

• CONSTANT VOLUME DUAL DUCT

APPLICTIONS

• VARIABLE VOLUME DUAL DUCT

APPLICATIONS

Dehumidification Control Function

. . . . . . . . . . . . . . 36

GUIDE SPECIFICATIONS

. . . . . . . . . . . . . . . . . . . . . 37-43

GENERAL

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

Air Volume (VAV) terminal control with a factory-integrated

controller and actuator. The zone controller maintains precise

temperature control in the space by operating the terminal fan

(if supplied), regulating the flow of conditioned air into the

space, and controlling the auxiliary heating (if applicable).

Buildings with diverse loading conditions can be supported by

controlling reheat or supplemental heat.

The Single Duct Air Terminal Zone Controller

(33ZCVAVTRM) provides dedicated control functions for sin-

gle duct terminals with modulating heat or up to 2 stages of

heat.

The VAV Fan Terminal Zone Controller (33ZCFANTRM)

provides dedicated control functions for series fan or parallel

fan powered terminals, single duct terminals with up to 3 stag-

es of heat or modulating heat. The VAV Fan Terminal zone

controller can also be used as a primary controller for dual duct

or zone pressure control applications.

When the VAV Fan Terminal Zone Controller is used in

conjunction with a secondary terminal and the 33ZCSECTRM

secondary terminal zone controller, zone pressurization appli-

cations can be supported. Also, when the VAV Fan Terminal

Zone Controller is used in conjunction with a secondary termi-

nal and the 33ZCSECTRM secondary terminal, constant vol-

ume dual duct applications can be supported.

Carrier’s Linkage system is an integrated combination of

Carrier Comfort Network (CCN) controllers for use with Sin-

gle Duct air terminals and Fan Powered terminals. The Single

Duct and Fan powered terminal zone controllers are part of the

Carrier ComfortID system.

Rooftop units and air handlers feature factory-installed PIC

controllers that are directly compatible with the system. They

do not require any special hardware to be compatible with the

Carrier linkage system. Consult your local CCN representative

for the complete list of compatible air handlers and rooftop

units. The Comfort System Air Manager (CSAM) or the

CC6400 supports linkage for non-Carrier air handlers.

Zone Controller Control Strategy —

The primary

goal of the zone controller control strategy is to satisfy the tem-

perature and air quality requirements of each zone in a timely

and energy efficient manner. Secondary control strategies

include zone pressure control, high humidity control, and

demand controlled ventilation (DCV). The control provides

pressure independent operation. To achieve these goals. The

control strategy is broken into two parts: local zone control and

system control.

The method for achieving local zone control is through the

use of an electronic control in each air terminal (zone control-

ler). The control functions of the zone controller are:

• temperature control of the space (cooling and optional

heating)

• control of the space humidity (dehumidification)

• ventilation of the space

• fan control (for series and parallel type fan powered ter-

minals)

• secondary damper control for dual duct terminals (con-

stant volume airflow)

• zone pressurization (through the use of a return air ter-

minal and secondary damper control)

• participation in the control of the entire air system

The method for achieving system control is to ensure that

the air source operation is based on the demands of the occu-

pied zones. In this concept, the air source produces only the

amount of conditioned air (at a temperature and pressure) that

is necessary to satisfy the current load requirements. It does this

by varying either the amount of air it delivers, at a constant

temperature, into the duct (maintaining duct pressure) or by

varying the quality (temperature, humidity, quantity of outside

air) of air it delivers into the duct. Its control parameters come

from its own internal sources (configuration parameters, sen-

sors) and from feedback information that it receives from the

zones that it is supplying. The feedback allows the air source to

adjust its static pressure set point, supply air temperature set

point, quantity of outdoor air, and occupancy schedule, which

allows it to run in the most efficient manner.

In addition the air source shall provide its operating mode to

the zone controllers to aid in the control of the air terminals.

Specifically the system shall utilize the following functions in

its control of the air source:

• Va ria ble Air Volu me (VAV) — VAV inv olves adju sti ng

the volume of air moving in the supply duct to maintain

the static pressure in the supply air duct at desired sup-

ply air pressure set point. This adjustment will be in

response to changing airflow requirements of the zones

serviced by the air source.

• Occupancy — Determining when the air source is oper-

ating based on the occupancy status of the zones. Over-

ride of zone occupancy is also available from space

temperature sensor.

• Mode determination — Determining the air source oper-

ating mode based on the demands of the zones.

• Temperature Set Point Reset — Adjusting the supply air

temperature set point of the air source based on the cur-

rent cooling demands of the zones

• Pressure Set Point Reset — Adjusting the supply air

pressure set point of the air source based on the current

airflow demands of the zones.

The VAV control is an inherent part of the air source control

that works outside the scope of the zoning system. It is includ-

ed in this document to provide a complete picture of the air

source operation. The remaining functions are integrated into

the zoning system strategy.

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