Shielded wire must be used for sensor
wiring and the shield should be termi-
nated on one end only to the unit ground-
ing block.
FLEXSYS COOLING
Field Wiring
Connect the FlexSys Slab Temp Sensor wiring to
CTB1 terminals 15 and 16 located inside the control
panel
(see Appendix 1).
Miscellaneous Connections
All units provided with a VFD include a factory mount-
ed static pressure sensor (SPS1). The unit can also
have an optional second static pressure sensor, (SPS2).
The second static pressure transducer would be used
if the main supply duct split into two main branches.
The control can be programmed to maintain the low-
est input, highest input or the average of the two. The
sensor is factory wired and requires field installation
of 1/4” ID sensor tubing to the selected duct location.
A field supplied static pressure probe and tubing must
be installed in the field prior to unit start-up.
Refer to the unit IOM Form 145.05-NOM3 for details
on how to install the static pressure probe and tubing.
Programming
Options Key - Unit Data Subsection
• UNIT TYPE = FLEXSYS.
• UNIT SIZE = Select Unit Size in tons from the
listed choices.
• REFRIGERANT TYPE = Select R22, 407C, or
R410A.
• COMP STAGING SEQ = For units with four
stages of cooling select SIMPLE, for units with
six stages of cooling select MIXED (on four com-
pressor units only).
Options Key - Supply System Subsection
• HIGH DUCT STATIC SW = Should be set to
INSTALLED if the optional High Duct Static
Switch is installed.
• SF VFD BYPASS = Should be set to INSTALLED
if the optional SF VFD Bypass is installed.
• DUCT PRESS SENSOR 2 = Should be set to IN-
STALLED if an optional 2
nd
duct static transducer
is installed.
Setpoints Key - Unit Data Subsection
• EVAP PD LIMIT OVERRIDE - 0.0 inwc - 1.00
inwc.
Setpoints Key - Cooling Subsection
• MX SUPPLY AIR TEMP = 50.0 °F - 75.0 °F.
• EVAP LEAVING AIR TEMP HIGH = 50.0 °F -
60.0 °F.
• EVAP LEAVING AIR TEMP LOW = 50.0 °F -
60.0 °F.
• MAXIMUM BYPASS = 20.0 TO 40.0%.
• UNOCC ZONE COOLING SETPOINT = 60.0
°F - 95.0 °F.
• RAT COOLING SETPOINT = RAT HEATING
SE 2.0 °F TO RAT SETPOINT FOR
HIGH SAT.
Setpoints Key - Supply System Subsection
• DUCT STATIC RESET LOW SETP = 0 INWG
- Span.
• DUCT STATIC RESET HIGH SETP = 0 INWG
- Span.
• DUCT STATIC OVER PRESSURE = 0 INWG
- Span.
• DUCT STATIC TRANSDUCER SPAN = 1.25,
2.5, 5.0 INWG.
Program Key - Cooling Subsection
• DEW POINT RESET = USER ENABLED,
USER DISABLED.
• ACTIVE SLAB CONTROL = USER EN-
ABLED, USER DISABLED.
• FLEXSYS REHEAT = USER DISABLED,
USER ENABLED
Program Key - Supply System Subsection
• SF VFD BYPASS MODE = Place in VFD BY-
PASSED to place the unit in SF VFD Bypass
Mode.
SECTION 5 - FLEXSYS UNITS
FORM 145.05-SU3 (611)
ISSUE DATE 6/01/2011
JOHNSON CONTROLS
17
SECTION 5 - FLEXSYS UNITS