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BAC-120063CW-ZEC FlexStat 

     10 

Installation and Configuration Guide, Rev. G

intervals) to an optional CSP-4702.

The Trend Viewer is available in the Main Menu to 

view the (last 256 samples of) data in tabular format. 

Software, such as KMC Connect or TotalControl, can 

view the trend objects as graphs as well as change 

the interval as desired.

The different sampling rates allow a “longer” or 

“finer resolution” view of the trends. The default 

sampling intervals can be changed by the user in 

ADVANCED > DEVICE

.

NOTE:

  The faster the sampling rate, the faster the 

256 samples are filled and the values start 

over.

NOTE:

  The FlexStat menu allows setting of 

intervals only in 

multiples of 1 minute

 (not 

seconds). If you change a default “seconds” 

interval in the menu, you will not be able to 

set it back to the original without a factory 

reset or BAS software.

Zone Hysteresis (Changeover)

In the Additional Setup menu, the Zone Hysteresis 

value (AV102) is the number of controllers (above 

50% of the total) required for “majority rule” in 

changing heating/cooling modes for the RTU or 

HPU. The default is 1. For an explanation of this 

changeover setting option, see 

Sequence of Operation 

on page 10

.

NOTE:

  Firmware earlier than R2.0.0.4 did not have 

this option.

Zone Status

In the lower right of the home screen, smaller letters 

show, in rotation:
•  The detected number of connected zones of 

SimplyVAVs.

•  The number of zones calling for cooling.
•  The number of zones calling for heating.

NOTE:

  After power-up or restarting of the FlexStat 

and/or SimplyVAVs, the zone numbers 

require several minutes to show correct 

values.

For more detailed information, under the Main 

Menu, select 

ZONE STATUS

 to view the status of all 

connected zones. Options for each zone’s values are:
•  Call for Cooling
•  Call for Heating
•  No Call for Either

Sequence of Operation

NOTE:

  The HPU and RTU sections of the 

FlexStat 

Application Guide

 have some basic 

generic information about HPU and RTU 

operation.

The BAC-120063CW-ZEC FlexStat determines RTU/

HPU heating or cooling mode by “majority rule” 

of the number of heating and cooling calls from the 

SimplyVAV controllers. If the number of heating and 

cooling calls is equal, the previous mode is main-

tained.
The 

number of controllers above 50% of the total re-

quired for changeover

 to the other mode is controlled 

by 

Zone Hysteresis 

(in the Additional Setup menu). 

For the default setting of 

1

, a majority by 

one

 control-

ler will cause the mode to switch. For example, 8 

controllers calling for heating versus 7 controllers 

calling for cooling will change the RTU/HPU mode 

from cooling to heating.

NOTE:

  If Zone Hysteresis is changed to 

2

, then 

heating/cooling mode maintains the 

previous mode until there are 

two 

more 

zones needing the opposite mode than 

those needing the current mode. Increasing 

the number can be helpful if the system 

seems to be switching modes back and 

forth too quickly. The maximum hysteresis 

value is 16.

NOTE:

 See 

Zone Hysteresis (Changeover) on page 

10

 and 

Configure the Application and 

Address on page 7

.

In RTU/HPU heating mode, the heating setpoint and 

the cooling setpoint are both set to 110°. In RTU/

HPU cooling mode, the heating setpoint and the 

cooling setpoint are both set to 55°. If there is no call 

for heating or cooling (all VAV boxes are satisfied), 

the cooling setpoint is set to 110° and the heating 

setpoint is set to 55°.

During a scheduled Off time, the RTU/HPU fan does 

not run unless there is a call for heating or cooling.

•  No Communication with a Zone (either there is a 

communication problem with a zone or no zone 

is connected)

The Zone Status screen also shows the Duct Status 

pressure.

Summary of Contents for FlexStat BAC-120063CW-ZEC

Page 1: ...mounting screws supplied by KMC Controls Using other screws may damage the FlexStat Do not turn screws in farther than necessary to remove the cover 2 If the cover is locked on the backplate turn the hex screws in the bottom and top of the FlexStat CLOCKWISE until they just clear the cover See Illustration 1 Pull the cover away from the backplate mounting base 3 Route the wiring through the backpl...

Page 2: ...or Ethernet Cable Up to 75 Feet Long MS TP Network STE 8x01 Room Temp Sensor and Configuration Tool Supply Air to Room Supply Air from RTU Zone 1 MAC 3 Device Instance 1000001 RTU Controller MAC 20 Device Instance 1000000 Zone 16 MAC 19 Device Instance 1000016 Illustration 2 Sample Networked RTU Installation CSP 4702 To HI Port DAT Displayed Roof Top Unit RTU Supply Air Return Air STE 140x Temp Se...

Page 3: ...tional AI9 IN8 Unused in this application AI8 IN7 Unused in this application AI7 IN4 Unused in this application AI4 IN3 Unused in this application AI3 GND Ground IN2 DAT AI2 NOTE The DAT sensor is configured for IN2 in the ADVANCED APPLICATION ADDITIONAL SETUP SENSORS menu NOTE Although typical terminal code letters are shown check the schematics of your unit for wiring details CAUTION Relays are ...

Page 4: ...UP ZONE HEAT PUMP 1 or 2 Compressors with Auxiliary and Emergency Heat NOTE Although typical terminal code letters are shown check the schematics of your unit for wiring details CAUTION Relays are for Class 2 voltages 24 VAC only Do not connect line voltage to the relays Do not mistakenly connect 24 VAC to an analog output ground Illustration 4 HPU Application Connections Input Terminals HPU Input...

Page 5: ... A IN4 IN3 GND IN2 Common C Phase R Analog 9 GND 7 9 Analog 8 Analog 7 Relay 6 SC 4 6 Relay 5 Relay 4 Relay 3 SC 1 3 Relay 2 Relay 1 Outputs Wiring Cutout in Backplate MS TP Network Inputs 24 VAC Wiring is dependent on application Inputs NOTE IN1 and IN5 6 are reserved for internal sensors NOTE SC Switched relay Common Output Connections Connect the device under control between the desired output ...

Page 6: ...od practices when connecting an MS TP network see Planning BACnet Networks Application Note AN0404A For the bank of three relays there is one Switched relay Common connection in place of the GND ter minal used with analog outputs See Illustration 6 For the relay circuit the phase side of the AC should be connected to the SC terminal FlexStat relays are NO SPST Form A Do not attach a device that dr...

Page 7: ...figuration and Operation Illustration 9 FlexStat Display and Button Functions Right Menu Left Override Down Up NOTE For additional information see the relevant parts of the Configuration section in the FlexStat Operation Guide but not all things apply to this model NOTE Settings and adjustments may require a password DAT Zone Information of Zones of Zones Calling for Cooling and of Zones Calling f...

Page 8: ...tem is stand alone address the FlexStat for MAC 20 Device Instance 1000000 See Illustration 2 To set the FlexStat s BACnet Device Instance and optionally name and location 1 Select ADVANCED enter password if needed and then DEVICE 2 Change or confirm INSTANCE to 1000000 DEVICE INSTANCE NAME ZEC_FlexStat_1 LOCATION KMC Controls 1000000 To configure the MAC address from the Main Menu select ADVANCED...

Page 9: ...Number of calls for heating AV25 at 1 minute intervals from SimplyVAVs 7 Duct static pressure AV103 at 1 minute intervals from an optional CSP 4702 8 Duct static pressure setpoint AV104 at 1 minute SETPOINTS COOL DAT SETPOINT HEAT DAT SETPOINT 130 F DUCT ST STPT 0 5 in H2O 55 F The optional duct static pressure setpoint is also in this menu NOTE The airflow minimum limit in each SimplyVAV controll...

Page 10: ...ns for each zone s values are Call for Cooling Call for Heating No Call for Either Sequence of Operation NOTE The HPU and RTU sections of the FlexStat Application Guide have some basic generic information about HPU and RTU operation The BAC 120063CW ZEC FlexStat determines RTU HPU heating or cooling mode by majority rule of the number of heating and cooling calls from the SimplyVAV controllers If ...

Page 11: ...hangeover on page 10 See also Sequence of Operation on page 10 See the relevant parts of the Troubleshooting section in the FlexStat Operation Guide Maintenance Remove dust as necessary from the holes in the top and bottom Clean the display with a soft damp cloth and mild soap Customization Additional customization can be done using KMC Connect KMC Converge or TotalControl For ex ample a fan statu...

Page 12: ...rmation about this model FlexStat on the BAC 120063CW ZEC web page For general operation configuration troubleshoot ing and other information see the generic FlexStat Operation Guide and FlexStat Application Guide See also the BAC 8000 series for information about the VAV controller actuators See also the CSP 4702 page for information about the differential pressure controller actuator For remotel...

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