FlexStat (General)
4
Application Guide, Rev L
Overview and General Installation
This document gives wiring details, schematics of sample applications
(including bills of material with KMC Controls products), and other
related information.
Wire the FlexStat to the desired equipment (see below for general pur-
pose wiring and switch configuration) and select the relevant program
from the (Advanced) Application submenu of the Advanced Menu and
other appropriate menus.
For general mounting and connection details, including network wir-
ing, EOL termination, power connections, input/output connections,
pull-up resistor switch settings, see the relevant FlexStat Installation
Guide.
For configuration, operation, and troubleshooting information, see the
FlexStat Operation Guide
.
Overview
Wiring Considerations
Because of the many connections (power, network, inputs, outputs, and
their respective grounds or switched commons),
be sure wiring is well
planned before installation of conduit!
CAUTION
To avoid damage from ground loops and other communication
issues in networked FlexStats, correct phasing on network and
power connections on ALL the networked controllers is critically
important.
• To prevent excessive voltage drop,
use a conductor size that is
adequate for the wiring length! Allow plenty of “cushion” to allow
for transient peaks during startup.
• Make sure that conduit for all wiring has adequate diameter for all
necessary wiring. Using 1-inch conduit and junction boxes is recom-
mended!
• Use external junction boxes above the ceiling or in another conve-
nient location as needed to make connections that run to the Flex-
Stat’s junction box.
• Using multiple conductor wires for all inputs (e.g., six conductor)
and outputs (e.g., 12 conductor) is recommended. Grounds for all
the inputs can be combined on one wire.
Mounting Considerations
FlexStats must
NOT
be:
• Mounted on an exterior wall.
• Mounted on or near a large thermal mass (e.g., concrete block wall).
• Blocked from normal air circulation by obstructions.
• Exposed to heat sources (e.g., lights, computers, copiers, or coffee
makers) or to sunlight (at
any
time of the day).
• Exposed to drafts from windows, diffusers, or returns.
• Exposed to air flow through the conduit (from leaks in plenum
ducts)—put plumber’s putty or similar material inside the conduit to
block air flow.
Quick (Temporary) Network Access
Through Computer Data Port
Communication with Other BACnet Net-
work Devices and Remote Monitoring
6 Analog
Inputs
for Other
Sensors or
Contacts
24 Volts AC
Power
9 (Total)
Analog
and Relay
Outputs
• AHU
• FCU
• HPU
• RTU
Temperature
Sensing
Optional
Humidity,
Motion,
and CO
2
Sensing
Applications
