Fan powered box temperature cascade control cooling (FpbTCasCtlC11)

Overview

The application function "Fan-powered VAV box temperature cascade control for cooling 11" (FpbTCasCtlC11) is the hub for the sequencing of the room temperature controllers for FPB cooling. It determines the room cooling setpoint and the room cooling demand signals to maintain the room temperature at the cooling setpoint.

For the cooling coils, the room demand output signal is designed for cascaded supply air temperature control in the room segment. (air sensor(s) required)

The following devices in the room segment(s) are supported:

Function

This AF works in collaboration with a room segment HVAC device component AF for cooling. The cooling room temperature PID controller is enabled based on a signal that is read via the grouping function (from equipment in the room segment) indicating whether cooling is available.

Devices for cooling are activated in the following order (default):
Chilled ceiling > Cooling coil > Fan > VAV

 

Cooling setpoint and plant mode

 

Plant operation mode

Cooling setpoint

1

Off

Protection cooling

2

Protection

Protection cooling

3

Economy

Economy cooling

4

Pre-Comfort

Pre-Comfort cooling

5

Comfort

Comfort cooling

6

Warm-up

Protection cooling

7

Cool down

Comfort / Pre-Comfort cooling1

8

Room low temperature protection

Protection cooling

9

Not used

 

10

Free cooling

Comfort cooling

11

Night cooling

Comfort cooling

12

Ventilation

Comfort cooling

13

Not used

 

14

Air volume flow off

Protection cooling

15

Smoke extraction positive pressure

Protection cooling

16

Smoke extraction negative pressure

Protection cooling

17

Purge

Protection cooling

1) Depends on Next room operating mode (NxROpMod) in HvacPltMod AF.

Feature configuration

Feature selections for "Room HVAC coordination" are accessed via the Application configuration task in the Configuration component.

Feature (AF)

Feature description

Ref.

Trend for present cooling setpoint

None/Active

☑

Configuration

Objects

Description

Object

Type

Default value

Cooling setpoint for comfort
▶ Default command must be configured on priority level 17.

0...50 [°C], 32.0...122.0 [°F]

SpCCmf

APrcVal

24 [°C]
75.0 [°F]

Delta cooling setpoint for pre-comfort
▶ Delta between comfort and pre-comfort setpoints.

0...10 [K], 0.0...18.0 [°F]

DSpCPcf

ACnfVal

1 [K]
2.0 [°F]

Cooling setpoint for economy

0...50 [°C], 32.0...122.0 [°F]

SpCEco

ACnfVal

35 [°C]
85.0 [°F]

Cooling setpoint for protection

0...50 [°C], 32.0...122.0 [°F]

SpCPrt

ACnfVal

40 [°C]
104.0 [°F]

Parameters

Description

Parameter

Default value

Comfort configuration

1:None
▶ None, means no aggregate is activated depending on cooling demand.
2:Radiant devices
▶ Radiant device, means only radiant devices (e.g. Chilled ceiling) will be activated depending on cooling demand.
3:Air treatment devices
▶ Air treatment devices, means only air treatment devices (Cooling coil, Vav) will be activated depending on cooling demand.
4:Radiant & air treatment devices
▶ Radiant & air treatment devices, both will be activated depending on cooling demand.

CmfCnf

4:Radiant & air treatment devices

Pre-Comfort configuration

Enumeration see CmfCnf

PcfCnf

4:Radiant & air treatment devices

Economy configuration

Enumeration see CmfCnf

EcoCnf

4:Radiant & air treatment devices

Protection configuration

Enumeration see CmfCnf

PrtCnf

4:Radiant & air treatment devices

Cool down configuration

Enumeration see CmfCnf

CoolDnCnf

4:Radiant & air treatment devices

Free cooling configuration

Enumeration see CmfCnf

FreeCCnf

4:Radiant & air treatment devices

Coil: Controller mode by comfort

0:Continuous
1:2-position
▶ 2-position, the output will be 0 or 100 % nothing between, be aware of delays.

CoilCmf

0:Continuous

Coil: Controller mode by pre-comfort

Enumeration see CoilCmf

CoilPcf

0:Continuous

Coil: Controller mode by economy

Enumeration see CoilCmf

CoilEco

0:Continuous

Coil: Controller mode by protection

Enumeration see CoilCmf

CoilPrt

0:Continuous

Coil: Controller mode by cool down

Enumeration see CoilCmf

CoilCoolDn

0:Continuous

Radiant devices: Controller mode by comfort

Enumeration see CoilCmf

RadDevCmf

0:Continuous

Radiant devices: Controller mode by pre-comfort

Enumeration see CoilCmf

RadDevPcf

0:Continuous

Radiant devices: Controller mode by economy

Enumeration see CoilCmf

RadDevEco

0:Continuous

Radiant devices: Controller mode by protection

Enumeration see CoilCmf

RadDevPrt

0:Continuous

Radiant devices: Controller mode by cool down

Enumeration see CoilCmf

RadDevCoolDn

0:Continuous

Radiant ceiling cooling sequence

RcgCSeq

1 [1..8 unique]

Coil cooling sequence

CoilCSeq

2 [1..8 unique]

Fan cooling sequence

FanCSeq

3 [1..8 unique]

VAV cooling sequence

VavCSeq

4 [1..8 unique]

Interface

Interface

Description

Type

Ref.

Owned by

PrSpC

Present cooling setpoint

APrcVal

●

-

TrndPrSpC

Trend for present cooling setpoint

FtrSel

☑

-

PrSpCCmf

Present cooling setpoint for comfort

ACalcVal

●

-

PrSpCPcf

Present cooling setpoint for pre-comfort

ACalcVal

●

-

PrSpCEco

Present cooling setpoint for economy

ACalcVal

●

-

PrSpCPrt

Present cooling setpoint for protection

ACalcVal

●

-

VavTRCtrC

Room temperature controller cooling for VAV

Controller

●

-

FanTRCtrC

Room temperature controller cooling for fan

Controller

●

-

CoilTRCtrC

Room temperature controller cooling for coil

Controller

●

-

RcgTRCtrC

Room temperature controller cooling for radiant ceiling

Controller

●

-

RCtl

Room control

GrpMaster

◉

Room

SpCCmf

Cooling setpoint for comfort

APrcVal

●

-

DSpCPcf

Delta cooling setpoint for pre-comfort

ACnfVal

●

-

SpCEco

Cooling setpoint for economy

ACnfVal

●

-

SpCPrt

Cooling setpoint for protection

ACnfVal

●

-

Engineering and commissioning