Carrier 33ZCSECTRM Especificaciones descargar pdf (Pagina 41)

3. Cooling, Fan Only, and Night Time Free Cool-

ing (NTFC):

a. If the zone requirement is none, then the

zone controllers shall modulate their damp-

ers to maintain their minimum cooling CFM

set point. Any zone controllers servicing

Series terminals shall also modulate their

dampers to maintain their minimum cooling

CFM set point after completing their SFTP

cycle. During the NTFC mode the zone con-

troller shall control between its heating and

cooling set points. During the other modes

the zone controller shall modulate its damper

to its occupied cooling set point. Parallel

fans shall only be enabled if the required

CFM falls below an operator adjustable

CFM limit.

b. If the zone requirement is cooling, then the

zone controllers shall modulate their air

dampers between their minimum and maxi-

mum cooling CFM set points to maintain

their cooling set point. Parallel fans shall be

disabled. Series fans shall start and control

after completing their SFTP cycle. For those

terminals that include humidity control, the

damper shall be modulate to an adjustable

maximum if the unit is occupied and heating

is not active. The local Relative Humidity

control shall be disable if the space tempera-

ture falls below the heating set point.

c. If the zone requirement is heating, then the

zone controllers shall modulate their damp-

ers to maintain their minimum cooling CFM

set point. Any zone controllers servicing

Series fans shall complete their SFTP cycle

before modulating their dampers. Any zone

controllers servicing single duct units with

reheat capability shall maintain the greater of

either the minimum cooling CFM set point

or the minimum reheat CFM set point. Zone

controllers servicing parallel units shall

enable their fans. Zone controllers servicing

Series terminals shall complete their SFTP

cycle before modulating their dampers. After

the fan starts, the damper shall be modulated

to maintain its minimum cooling CFM set

point.

4. Heat:

a. If the zone requirement is none, then the

zone controller shall maintain its minimum

heating CFM set point. Parallel fans shall be

disabled and their air damper shall be modu-

lated to maintain their minimum heating

CFM set point. Series units shall complete

their SFTP cycle checks and then modulate

its damper to maintain its minimum heating

CFM set point.

b. If the zone requirement is cooling, then the

zone controller shall modulate its damper to

maintain its minimum heating CFM set

point. Parallel fans shall be disabled. Zone

controllers servicing Series units shall com-

plete their SFTP cycle and then shall

modulate their primary damper to maintain

their minimum heating CFM set point.

c. If the zone requirement is heating, and the

zone controller is configured to use central

heat, then it shall modulate its damper

between its minimum and maximum heating

CFM set points to maintain its heating set

point. If it is not configured for central heat,

it shall maintain its minimum heating CFM

set point. Zone controllers servicing parallel

units shall enable their fan. Zone controllers

servicing Series fans, after completing their

SFTP cycle, shall modulate their damper

between their minimum and maximum heat-

ing CFM set points (if configured for central

heat). Otherwise, the zone controller shall

modulate its air damper to maintain its mini-

mum heating CFM set points.

5. Pressurization:

a. If the zone requirement is none or cooling,

then the zone controller shall maintain its

maximum cooling CFM set point. Parallel

fans shall be disabled. The damper for series

fans, after successfully completing its SFTP

cycle, shall modulate to maintain the maxi-

mum cooling CFM set point.

b. If the zone requirement is heating, and the

zone controller has been enabled to provide

local heating, then the zone controller shall

modulate its damper to its maximum cooling

CFM set point and enable its auxiliary heat.

If local heat is not available, the damper shall

be modulated to maintain its maximum cool-

ing CFM set point.

c. For series fan operations, the SFTP cycle

shall be completed before modulating the

primary air damper to its maximum cooling

CFM set point.

6. Evacuation:

During the Evacuation mode all terminal fans

shall be disabled and all dampers shall close.

Part 4 — Abnormal Conditions

4.01 The proposed system shall include the ability to detect

abnormal conditions, and to react to them automati-

cally. A return to normal conditions shall also generate

a return to normal notification and the system shall

revert back to its original control scheme before the

abnormal condition existed.

The following abnormal terminal conditions shall

automatically generate an alarm and the system shall

take the following actions:

A. If a space temperature sensor is determined by the

zone controller to be invalid, the zone controller

shall generate an alarm, default to its Cooling mode

and maintain its minimum cooling CFM set point.

B. If a relative humidity sensor is determined by the

zone controller to be invalid, the zone controller

shall generate an alarm and disable its humidity

algorithm.

C. If an indoor air quality sensor is determined by the

zone controller to be invalid, the zone controller

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Carrier 33ZCSECTRM Especificaciones Pagina 41

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