Installation - Controls; Control Options; Customer Supplied Terminal Interface; (Csti) - Trane BCHE Installation, Operation And Maintenance Manual

Installation - Controls

Control Options

Available control options are:
• Customer-supplied terminal interface (CSTI)
• Thermostat
®
• Tracer UC400-B controller with Air-Fi
Communications Interface
Customer Supplied Terminal
Interface (CSTI)
The control interface is intended to be used with a field-
supplied, low-voltage thermostat or controller. The control
Figure 52. CSTI adapter board and field connections
3 2 1 13 12 11 10 9 8 7 6 5 4 3 2 1
The CSTI adapter board provides all the hookups as the
standard adapter board, but in addition, provides hookups
for valve control (main and auxiliary coils), electric heat
control, and damper control. Screw terminal blocks provide
convenient access to fan controls and to end device
control. In addition, a courtesy 10 VDC supply is provided
for use with an external potentiometer or rheostat. The 10
VDC supply supports up to 10 mA draw.
TB3 (right 13 positions) is normally used to provide:
• 24 Vac supply to a wall fan speed switch or
• 24 Vac supply to a field-installed unit-mounted
controller, or a wall-mounted controller or thermostat
• Inputs (returns) for thermostatic fan control: High,
Medium, and Low
• Inputs (returns) for cooling/heating requests
• Inputs (returns) for electric heat requests
• Inputs (returns) for damper operation requests
TB4 (left three positions) is normally used to control the
system with a 0–10 VDC input from a thermostat/controller
with a variable speed output, or a fan control rheostat.
BCX-SVX002A-EN
box contains a relay board which includes a line voltage to
24-volt transformer, quiet contactors (for electric heat
units), and an optional disconnect switch. All end devices
are wired to a low-voltage terminal block and are run-
tested, so the only a power connection and thermostat
connection is needed to commission the unit. Changeover
®
Wireless
sensors and controls are provided whenever a change-
over coil is selected. When N.O. valves are selected,
inverting relays are provided for use with standard
thermostats.
Customer low-voltage
interface for fan speeds,
variable fan speed, and
24 Vac supply, valve control,
EH control, damper control,
condensate overflow status
Valve(s), electric heat, and
changeover configuration
switches (factory-set)
The terminal block functional assignments and polarity are
shown for reference only, and the schematics that ship with
each unit should be consulted before wiring. Wiring
assignments are configured for each unit.

CSTI Adapter Board Configuration

1. VSP 10V
2. VSP 0–10V
3. VSP DC COM
1. 24 Vac B (hot)
2. 24 Vac Y (gnd)
3. High
4. Medium
5. Low
6. V1Op/Cooling
7. V1Cl (not std)
8. Not used
9. Not used
10. V2Op/EH1St/Heating
11. V2Cl/EH2St (not std)
12. Damper Open
13. Dmp Cl (not std)
CAUTION
Burn Hazard!
Failure to follow this instruction could result in the
unit overheating and becoming hot to the touch,
which could result in minor or moderate injury, and/or
equipment damage.
On electric heat units, certain parameter values are
locked out to prevent overheating of the unit. These
functions will appear to be saved; however, they will
not be accepted if the Electric Heat Protection setting
is "On". Do not change the Electric Heat Protection
setting to "Off" and make changes to the protected
settings unless you are programming an
unconfigured service replacement board to match the
unit settings on a ECM configuration label.
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