Viconics VT7300F-2572 Installation Manual - Manual (Page 5)

5 | PIR Ready VT7300-2572 Series
Contact closed = Alarm displayed
5. (Service): a backlit flashing Service alarm will be displayed on the Terminal
Equipment Controller LCD screen when the input is energized. It can be tied in
to the AC unit control card, which provides an alarm in case of malfunction.
Contact opened = No alarm
Contact closed = Alarm displayed
Universal input #3 can be configured for the following functions:
1. (None): No function will be associated with the input
2. (COC/NH) Change over dry contact. Normally Heat: Used for hot / cold air /
water change over switching in 2 pipe systems.
Contact closed = Cold air / water present
Contact opened = Hot air / water present
Only used and valid if system is setup as 2.0. Parameter (Out1Conf) set as 2.0.
3. (COC/NC) Change over dry contact. Normally Cool: Used for hot / cold air /
water change over switching in 2 pipe systems.
Contact closed = Hot air / water present
Contact opened = Cold air / water present
Only used and valid if system is setup as 2.0. Parameter (Out1Conf) set as 2.0.
4. (COS) Change over analog sensor: Used for hot / cold air / water change over
switching in 2 pipe systems.
Only used and valid if system is setup as 2.0. Parameter (Out1Conf) set as 2.0.
If temperature is > 77 °F = Hot air / water present
If temperature is < 75 °F = Cold air / water present
5. (SS) Supply air sensor monitoring: Used for supply air temperature
monitoring.
Only used for network reporting of the supply air temperature. Has no internal
function in the Terminal Equipment Controller.