Carrier 33ZCSECTRM Especificaciones descargar pdf (Pagina 17)

APPLICATION

General —

The zone controller is a CCN device that con-

forms to standard CCN communications protocol. The zone

controller is capable of controlling Carrier and many non-

Carrier air terminal units in networked or stand-alone applica-

tions. The zone controller includes an integrated modulating

damper actuator. The zone controller provides Pressure Inde-

pendent airflow control.

Each zone controller can operate in a stand-alone mode

based on the sensors installed.

If the supply air sensor is not installed, the controller will as-

sume that the air source is on and that the air source’s operating

mode is cooling. The zone controller will operate using only its

minimum and maximum cooling CFM configuration limits. If

the zone controller is equipped with ducted type heat, then

when local heating is not active, the temperature read from the

SAT sensor will be used to determine if the air source is heating

or cooling. The appropriate minimum and maximum CFM

limits (heating or cooling) will be used based on the air source

operating mode.

NOTE: In this mode of operation, the minimum heat and cool

limits must NOT be set to zero.

Finally, a primary air temperature (PAT) sensor can be con-

nected to any stand-alone zone controller and mounted in the

supply air duct where it is not affected by the airflow of a spe-

cific zone. In this case, the zone controller is configured as a

Linkage Master zone with a system size of 1. In this configura-

tion, the zone will determine the air source operating mode

(OFF, COOLING, HEATING, or FREE COOLING). Because

the PAT sensor is not affected by airflow at the zone, minimum

airflow limits may be set to 0 cfm.

Each zone controller supports the following set points:

• occupied cooling

• occupied heating

• unoccupied cooling

• unoccupied heating

NOTE: The minimum differential between the heating and

cooling set points is 1.0 degree F.

To provide an accurate low-end airflow measurement, the

control performs an automatic zero calibration (ZeroCal) fea-

ture. The controller does this to account for any offset, which

may be inherent in the airflow sensor.

The ZeroCal procedure will be performed every time the air

source mode transitions to OFF. Additionally, for systems

which operate continuously, a ZeroCal procedure will be per-

formed every 72 hours. To prevent all the dampers from clos-

ing simultaneously, an offset time delay based upon the zone

controller address is used.

The zone controller can be used in the following

applications:

1. Single duct terminal applications

a. Cooling only

b. Staged electric heat

c. Hot water/steam heat (modulating or two-position)

2. Series fan terminal applications

a. Cooling only

b. Staged electric heat

c. Hot water/steam heat (modulating or two-position)

3. Parallel fan terminal applications

a. Cooling only

b. Staged electric heat

c. Hot water/steam heat (modulating or two-position)

4. Dual Duct applications

a. Constant volume

b. Variable volume

c. VAV retrofit - cold deck close-off (requires total

airflow probe)

5. Constant ventilation (dual duct terminal with ducted out-

door air)

6. Terminal cfm tracking applications (zone pressure

control)

This section of the manual describes operating sequences

for the zone controller in its various configurations and modes.

It presents separate descriptions for single duct, series fan pow-

ered, and parallel fan powered air terminals in the following

configurations: without local heat, with staged electric heat,

and with hot water or steam heat (two-position or proportion-

al). The system in which the zone controllers operate should

also contain a control with linkage coordination or an air

source with either a linkage compatible PIC, AirManager™, or

Comfort Control.

Each description is accompanied by figures depicting the

hardware configuration and the sequence of control events for

the application being described. In the control sequence dia-

grams the vertical axis represents airflow and the horizontal

axis represents space temperature. The sequence of events for

cooling operation reads from right to left, and the sequence of

events for heating operation reads from left to right.

The zone controller employs proportional/integral/deriva-

tive (PID) control routines to provide precise, efficient, and sta-

ble control. The PID calculations take into account both the

space temperature deviation from set point and the rate at

which the temperature is changing.

General Heating Information —

Heating may be

one of two types, ducted or non-ducted. In a ducted heat type

system, the heating mechanism is located within the air termi-

nal, upstream of the supply air temperature sensor. The heating

device may be either a hot water/steam heating coil or up to

three stages of electric heat. Use of a air terminal heating coil

will require that the zone controller be wired to a supply air

temperature sensor. The SAT sensor will measure the supply

air temperature into the zone. The SAT sensor will provide

feedback to the auxiliary PID heating control loop and ensures

that the supply air temperature does not exceed the configured

maximum temperature.

There are four types of heat a zone controller can be config-

ured for use with:

• modulating hot water/steam valve (VAV)

• modulating hot water/steam valve (CV)

• two-position hot water/steam valve

• electric heat (1 to 3 stages)

If a Heating Type is configured, but Ducted Heating is NOT

selected, the heating control algorithm will not utilize an SAT

sensor. A two-position heating valve or single-stage electric

heat are most common, although the zone controller can oper-

ate up to 3 non-ducted electric heat stages. The zone controller

will maintain the space temperature at the heating set point.

The zone controller will wait for the Heat On Delay to expire

before energizing any heating device.

For non-ducted, modulating hot water baseboard applica-

tions, the zone controller requires a 10K ohm leaving water

sensor which is attached to the baseboard heater and wired to

the SAT sensor input. This device is field-supplied.

NOTE: A 33ZCENSCHG changeover sensor can be used as a

leaving water sensor.

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