Carrier 33ZCSECTRM Especificaciones descargar pdf (Pagina 18)

If the zone controller is configured as a parallel fan type ter-

minal, the zone controller will utilize the fan as the first stage of

heat, regardless of the heat type configured. The amount of

time the fan will operate as the first heat stage is determined by

the value configured for the Heat On Delay (10 to 20 minutes

recommended).

The Heat On Delay is used to prevent mechanical heating

from being operated for a configured period of time. For single

duct type terminals, a delay of 2 minutes (default value) allows

the zone controller to increase the airflow to the desired reheat

cfm before operating heat. For parallel fan type terminals, the

default value is typically increased to 15 minutes to allow the

fan to utilize heat from the ceiling plenum, before any addition-

al mechanical heating is energized.

Disabling Reheat From CCN —

The zone controller

provides a means to disable the reheat function from the CCN.

This is used to prevent zones that use a central heat source from

using local heat. When the central heating source is not produc-

ing hot water or steam heat to the terminals (the boiler is dis-

abled for example), a system mode broadcast can prevent these

terminals from entering reheat mode. By preventing reheat, the

zone controller will control to the minimum cooling CFM rath-

er than the higher reheat CFM. This will prevent more cool air

from entering into the space when heating is actually required.

The HEAT ENABLED variable is located in the display ta-

ble for each zone controller and can be forced from the CCN.

Normally when the zone controller is in heating, this variable

will indicate ENABLE. To disable heating when the central

heat source is off, this variable must be forced to DISABLE.

This force should occur at least once an hour and sent to all

zone controllers that are supplied heat from the central source.

This application will require the use of a Comfort Controller or

data transfer module to accomplish this function.

Non-Ducted Heat Control (Single or Staged

Heat) —

Either zone controller can support the non-ducted

heat function. The non-ducted heat function can be configured

for either single duct units, fan powered parallel, or fan pow-

ered series applications or constant volume dual duct applica-

tions where auxiliary perimeter heat is provided. Heat needs to

be controlled within the zone that is controlled by the terminal

unit. Non-ducted heat can be applied to zone controller units

configured as Dual Duct Units which have additional perimeter

heating.

In a non-ducted heat application, the heating controlled de-

vice is located within the space. The heating device is typically

either a two position (On-Off) device like a hot water valve or

electric baseboard heater. For this application, no heating con-

trol loop feedback is required. The installation of the supply air

sensor is not required when the unit is configured for non–

ducted heat.

Additionally, the zone controller can control a single stage,

two-position, or multistage electric supplemental heat devices.

The zone controller will only use space temperature as feed-

back into the temperature control loop to maintain the heating

set point in these applications.

When the 33ZCVAVTRM or 33ZCFANTRM zone control-

lers are applied and configured for heat, and heating is being

called for in the space, the zone controller reads the space sen-

sor and the output is adjusted to satisfy conditions. The number

of stages (if applicable) is determined by comparing space tem-

perature with the current biased heating set point.

Configuration determines the logic output type for normally

open or normally closed type two-position valves. Hysteresis is

determined by the Heating Proportional Gain configured.

A terminal unit equipped with heating will provide the min-

imum heating CFM configured for the zone whenever the air

source is in heat mode unless VAV central heating is enabled.

The heating control maintains the current heating set point

(plus any offset from a 33ZCT56SPT sensor slide bar during

occupied periods).

Modulating Baseboard Heating —

The zone con-

troller can provide control of modulating hot water (hydronic)

baseboard heating which provides perimeter heating for a zone.

The zone controller can be used with single duct, fan powered,

or dual duct terminals using perimeter hydronic heating. A

field-supplied modulating (floating point type) water valve is

used to control the flow of water through the baseboard hy-

dronic heating coil. A field-supplied accessory temperature

sensor (33ZCSENCHG) attached to the leaving water side of

the hydronic baseboard heating coil is required to properly

modulate the hot water valve.

NOTE: It is strongly recommended to mount both the temper-

ature sensor and the modulating water valve to the leaving side

of the hydronic heater. This will minimize installation time and

improve valve life.

Ducted Heat Control (Staged or Modulating

Device) —

The zone controller can support a ducted heat

function. The ducted heat function can be configured for either

single duct units, fan powered parallel, or fan powered series

applications where heat needs to be controlled within the zone

that is supplied by the terminal unit.

For this application, heating control loop feedback is re-

quired. The installation of the supply air sensor is required

when the unit is configured for ducted heat.

The zone controller can control a single stage, two-position,

multistage electric heat, or a modulating hot water valve.

When the 33ZCVAVTRM or 33ZCFANTRM zone control-

lers are applied and configured for heat, and heating is being

called for in the space, the zone controller reads the space sen-

sor and the output is adjusted to satisfy conditions. The number

of stages (if applicable) is determined by comparing space tem-

perature with the current biased heating set point.

Configuration determines the logic output type for normally

open or normally closed type two-position valves.

A terminal unit equipped with heating will provide the min-

imum heating CFM configured for the zone whenever the air

source is in heat mode unless VAV central heating is enabled.

The heating control maintains the current heating set point

(plus any offset from a 33ZCT56SPT sensor slide bar during

occupied periods).

Modulating Hot Water/Steam Valve CV —

The

Modulating Hot Water/Steam Valve CV mode is designed to

use modulating heat valve with a constant volume airflow. This

mode of operation allows all CFM set points to be set to the

same CFM value. The zone reheat will temper the supply air to

maintain proper zone temperature at the configured constant

volume of air.

VAV Central Heating —

The use of the zone controller

in a system allows for the application of VAV heating utilizing

the heat from a central air source. Typically when a system is

designed, the central heat is used for morning warm up only.

The zone controller provides the ability to add heat to a system

during the occupied mode from a central source. Terminal units

designed without any local heat (ducted or non ducted), should

utilize VAV Heating. During VAV heating, the zone controller

modulates its primary air damper to provide heat when the air

source is in Heat Mode. The airflow is controlled so that the

zone achieves and maintains the desired heating set point.

In VAV central heating, the terminal provides a variable vol-

ume into the zone. The central supply air will be a source of

heating when the air source is in the heating mode.

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