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ASTON COMPACT INSTALLATION MANUAL
Optional FX10 Microprocessor
and BAS Interface
The FX10 is a microprocessor based control that not only monitors
and controls the heat pump but also can communicate any of this
information back to the building automation system (BAS). This
means that not only does the control monitor the heat pump at the
unit you can also monitor and control many the features over the
BAS. This clearly puts the FX10 in a class of its own.
The control will enumerate all fault conditions (HP, LP, CO, LOC,
and Freeze Detection) over a BAS as well as display them on a
medium user interface (MUI). HP, LP, CO and Freeze Detection
faults can all be reset over a BAS. A Loss Of Charge fault can not
be reset or bypassed until the problem has been corrected. A MUI
is invaluable as a service tool for the building service team.
The unit can be commanded to run by a typical heat pump
thermostat or run based on heating and cooling set points
supplied by a BAS. The control board is wired with quick connect
harnesses for easy field change out of a bad control board. All
variable speed ECM blower speed settings can be changed
over a BAS or with a MUI. The control has an input programmed
to enable field installed emergency heat in the event that the
compressor is locked out. This input can also be commanded on
from a BAS as needed. An alarm history can be viewed through
the MUI and will be held in memory until the unit is power cycled.
Relative humidity can be read by a 0-5VDC humidity sensor
that is displayed over the network. If you are using a variable
speed ECM blower motor the control can enable dehumidification
mode based on a set point in the control. The dehumidification
set point itself can also be changed over a BAS or with a MUI.
Dehumidification mode can also be enabled by the BAS. Because
the FX10 is not factory configured to read CO
2
levels, contact the
factory for application assistance.
The FX10 control has unused analog and digital inputs for field
installed items such as air temperature, water temperature, CO
2
or
current status switches. The control has unused binary and PWM
outputs that can be commanded over the BAS for field use.
An optional Medium User Interface (MUI) for control setup and
advanced diagnostics is available with some mounting kits, MUIK3
- Panel mount version and the MUIK4-Wall mount version.
Zone Sensors
There are two options for zone sensors that can be used with the
FX10 control. Both sensors use a Johnson controls A99 positive
temperature coefficient type sensor. The TAXXJ02 has a set point
adjustment now which will give the end user a +/- 5°F adjustment
from the set point as well as a push button that can be used for
temporary occupancy. The control leaves the factory set to operate
with a TAXXJ02 sensor, the TAXXA04 sensor through a building
automation system, or with a user interface.
Standard Features
• Anti Short Cycle
• High Pressure Protection
• Low Pressure Protection
• Freeze
Detection
• Loss Of Charge Detection
• Random
Start
• Display for diagnostics
• Reset Lockout at disconnect or through BAS
• 2
Accessory
outputs
• Optional BAS add-on controls
DDC Operation and Connection
Other optional network protocol boards that can be added to the
FX10 are:
• Johnson Control N2
• LonWorks
• BACnet
- MS/TP @ 19,200 Baud rate
- Limit devices to 30 on a single trunk line
Control and Safety Feature Details
Emergency Shutdown
The emergency shutdown mode can be activated by a command
from a facility management system or a closed contact on BI-2.
The default state for the emergency shutdown data point is off.
When the emergency shutdown mode is activated, all outputs will
be turned off immediately and will remain off until the emergency
shutdown mode is de-activated. The first time the compressor
starts after the emergency shutdown mode has been de-activated,
there will be a random start delay present.
Controls - FX10 (optional)
Main FX 10 Board
Summary of Contents for Aston Compact Series
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