Catalogue

44 UV-PRC004-EN
Controls
Customer Supplied Terminal Interface (CSTI)
The control interface is intended to be used with a field-supplied, low-voltage thermostat or
controller. The control 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 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.
The CSTI adapter board provides all the hookups of 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.
Figure 10. CSTI adapter board
Figure 11. CSTI adapter board field connections
1. VSP 10V
2. VSP 0–10V
3. VSP DC COM
1. 24 Vac Y (hot)
2. 24 Vac Y (gnd)
3. High
4. Medium
5. Low
6. V1Op/Cooling
7. V1C1 (not std)
8. Not used
9. Not used
10. V2Op/EH1St/Heating
11. V2C1/EH2St (not std)
12. Damper Open
13. Dmp Cl (not std)
Customer Low-Voltage Interface for
Valves, Electric Heat, Dampers, Fan
Speeds, Variable Fan Speed, and
24 Vac Supply
Valve(s), Electric Heat, and Changeover
Configuration Switches (Factory-Set)
321
1098 7654 32
1
11
12
13
CSTI
UV-PRC004-EN.book Page 44 Monday, February 4, 2013 11:01 AM