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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
EN2B-0285GE51 R0909
12
Configurations
General
The following sections provide an overview of the Excel 10
FCU Controller options related to inputs and outputs. See
Application Step 6. Plug-Ins Configuration Screens for
complete list of configuration options and defaults.
Table 7. Hardware options summary
option possible configurations
fan type • no fan
• one-speed
• two-speed
• three-speed
fan interlock • enabled
• disabled
FCU system type • two-pipe
• four-pipe
output 1 actuator
type
• floating
• floating mid (one for heat/cool)
1
• one-stage
• two-stage
• three-stage
• PWM
• thermal
output 2 actuator
type
• floating
•
floating mid (one for heat/cool)
1
• one-stage
• two-stage
• three-stage
• PWM
• thermal
valve direction • direct
• reverse
reheat • none
• reheat (W7752D and F and
W7754P1000, only)
• free use (W7752D and F and
W7754P1000, only)
digital input • not used
• window closed
• occupied sensor
• air flow detector
• cool changeover
• window open
• unoccupied sensor
• no air flow
• heat changeover
• movement
• no movement
wall module option • local
• shared
temperature sensor
type
• none
• NTC non-linearized
NOTE:
1
The floating-mid option is only for changeover applications
and uses only one of the two outputs.
Fan Type
Each fan coil unit controlled by an Excel 10 FCU Controller
can have a fan with up to three different speeds or no fan at
all. Multi-speed fans are switched at the same switching levels
as multi-staged heating control points (see Fig. 9). For
example, a three-speed fan will switch ON its first speed at
the same control level as the first stage of heating or cooling
up until the second stage of heating or cooling where the
second fan speed will switch on. A two stage fan will switch
with the first two stages of a 3-stage heating or cooling
system. Likewise, a single speed fan will turn ON at the first
stage of any multi-staged system. Conversely, a multi-speed
fan may follow multiple switching levels even for single-
staged, floating, PWM, or thermal actuator-based systems.
Hysteresis
The hysteresis for fan speed extends to the next lower
switching level (or a control level of 0) as is shown in Fig. 9.
For example, the second fan speed will remain ON until the
control level falls below the switching point for the first fan
speed. Minimum ON/OFF times can be configured and will
apply to all fan switching points.
Interlock
A fan interlock can be configured which prevents heating or
cooling outputs from being turned ON in the event of a fan
failure (where an air flow detector is installed to detect fan
failure). When fan interlock is configured, run-up and overrun-
times can be configured to delay switching ON the heating or
cooling equipment after switching ON the fan and delay
switching OFF the fan after the heating or cooling equipment
is switched OFF.
The fan can be configured to run continuously during the zero
energy band during occupied periods.