Overview And General Installation; Mounting Considerations; Wiring Considerations - KMC Controls FlexStat Application Manual

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.
Communication with Other BACnet Net-
work Devices and Remote Monitoring
Temperature
Sensing
6 Analog
Inputs
for Other
Sensors or
Contacts
24 Volts AC
Power
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.
FlexStat (General)
Optional
Humidity,
Motion,
and CO
2
Sensing
Applications
• AHU
• FCU
9 (Total)
Analog • HPU
• RTU
and Relay
Outputs
Quick (Temporary) Network Access
Through Computer Data Port
Overview

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.

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.
4 Application Guide, Rev L