30
RC SERIES INSTALLATION MANUAL
Control Timing & Fault Recognition Delays
Lead compressor “ON” delay ............................................90 seconds
(not applicable for single compressor models)
Minimum compressor “ON” time ...........................................2 minutes
(except for fault condition)
Short cycle delay ..................................................................5 minutes
Random start delay ......................................................0-120 seconds
High pressure fault ............................................................. <1 second
Low pressure fault .............................................................30 seconds
Water coil low temperature (freeze sensing) fault ...................30 seconds
Condensate overflow fault .................................................30 seconds
Low pressure fault bypass ....................................................2 minutes
Water coil low temperature (freeze sensing)
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 Water Coil Low Temp (Freeze Sensing)) over a BAS as well
as display them on a medium user interface (MUI). HP, LP, CO
and Water Coil Low Temp (Freeze Sensing) 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
ECM variable fan 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 an ECM fan 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, MUIK1
- Panel mount version and the MUIK2-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
TAXXA01 sensor through a building automation system or with a
user interface.
Standard Features
Anti Short Cycle
•
High Pressure Protection
•
Low Pressure Protection
•
Water Coil Low Temperature (Freeze Sensing)
•
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 & 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 40 on a single trunk line.
Controls - FX10 cont.
