Carrier 33ZCVAVTRM Specifications download pdf (Page 109)

dampers while the fan is operating. If local

heat is available, the series and parallel fans

shall start and local heat shall be enabled to

maintain its unoccupied heating set point. The

damper shall be modulated open to 70% after

heating is no longer required.

2. Cooling and Night Time Free Cooling (NTFC):

a. If the zone requirement is none, then the

zone controllers shall modulate their damp-

ers to maintain their minimum cooling

damper position or damper ventilation posi-

tion if the supply air temp is between 65 and

75 F. Any zone controllers servicing Series

terminals shall also modulate their dampers

to maintain their minimum cooling damper

position or damper ventilation position if the

supply air temp is between 65 and 75 F

after completing their SFTP cycle. During

the NTFC mode the zone controller 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.

b. If the zone requirement is cooling, then the

zone controllers shall modulate their air

dampers between their minimum and maxi-

mum cooling damper position to maintain

their cooling set point. Parallel fans shall be

disabled. Series fans shall start and control

after completing their SFTP cycle.

c. If the zone requirement is heating, then the

zone controllers shall modulate their damp-

ers to maintain their minimum cooling

damper position. Any zone controllers ser-

vicing 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

damper position or the minimum reheat

damper position. Zone controllers servicing

parallel units shall enable their fans. Zone

controllers servicing Series terminals shall

complete their SFTP cycle before modulat-

ing their dampers. After the fan starts, the

damper shall be modulated to maintain its

minimum cooling damper position.

3. Heat:

a. If the zone requirement is none, then the

zone controller shall maintain its minimum

heating damper position. Parallel fans shall

be disabled and their air damper shall be

modulated to maintain their minimum heat-

ing damper position. Series units shall com-

plete their SFTP cycle checks and then

modulate its damper to maintain its mini-

mum heating damper position.

b. If the zone requirement is cooling, then the

zone controller shall modulate its damper to

maintain its minimum heating damper posi-

tion. Parallel fans shall be disabled. Zone

controllers servicing Series units shall com-

plete their SFTP cycle and then shall modu-

late their primary damper to maintain their

minimum heating damper position.

4. Pressurization:

a. If the zone requirement is none or cooling,

then the zone controller shall maintain its

maximum cooling damper position. Parallel

fans shall be disabled. The damper for series

fans, after successfully completing its SFTP

cycle, shall modulate to maintain the maxi-

mum cooling damper position.

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

damper position and enable its auxiliary

heat. If local heat is not available, the

damper shall be modulated to maintain its

maximum cooling damper position.

c. For series fan operations, the SFTP cycle

shall be completed before modulating the

primary air damper to its maximum cooling

damper position.

5. 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

automatically.

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 Ventilation

mode and maintain its configured ventilation

damper position.

B. If a relative humidity sensor (monitor only function)

is determined by the zone controller to be invalid,

the zone controller shall generate an alarm.

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

zone controller to be invalid, the zone controller

shall generate an alarm, and disable its IAQ

algorithm.

D. If a zone controller loses communication with its

associated coordinator, it shall generate an alarm. If

the zone controller does not have a supply-air sen-

sor installed, then the zone controller shall assume it

is in a Cooling mode and modulate its primary air

damper between its minimum and maximum

damper position. If the zone includes a reheat coil, it

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Carrier 33ZCVAVTRM Specifications Page 109

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