WaterFurnace Envision Low Sill - Manual (Page 30)

30
ENVISION LOW SILL CONSOLE INSTALLATION MANUAL
Condensate overflow fault ...............................................30 seconds
Low pressure fault bypass ................................................... 2 minutes
Freeze detection fault bypass ............................................ 2 minutes
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. 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.
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 and can be changed to read 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.
Lockout Mode
Lockout mode can be activated by any of the following
fault signals: refrigerant system high pressure, refrigerant
system low pressure, freeze detection, and condensate
overflow. When any valid fault signal remains continuously
active for the length of its recognition delay, the controller
will go into fault retry mode, which will turn off the
compressor. After the Compressor short cycle delay, the
compressor will attempt to operate once again. If three
Controls cont.