WaterFurnace Envision (XL) - Manual (Page 27)

ENVISION 7-25 TONS INSTALLATION MANUAL
28
Optional FX10 Microprocessor Control
FX10 Control Overview
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 ECM2.3 variable blower speed
settings can be changed over a BAS or with a MUI. The
control has an output programmed to enable emergency
heat in the event that the compressor is locked out. This
output 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 humidity sensor and displayed
over the network and if you are using an ECM2.3 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.
The FX10 control has unused analog and digital inputs
for field installed items such as air temperature, water
temperature, 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, MUIK1 - Panel mount version and the MUIK2-Wall
mount version.
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 DDC control add-on
DDC Operation and Connection
Other optional network protocol boards that can be added
to the FX10 are:
• Johnson Control N2
• BACnet
• LonWorks
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, heating 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 consecutive faults occur in 60 minutes during a
single heating or cooling demand, the unit will go into
lockout mode, turning off the compressor, enabling the
alarm output, and setting the blower back to low speed
Main FX 10 Board