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Binary inputs
CNT-SVX07C-EN 15
BI3: Occupancy or generic binary input
The BI3 binary input can function as either:
• The occupancy input
• A generic binary input
The function of occupancy is to save energy by spreading zone setpoints
when the zone is unoccupied. As the occupancy input, BI3 can be used for
two related functions. For stand-alone controllers, BI3 can be hard-wired
to a binary switch or timeclock to determine the occupancy mode—either
occupied or unoccupied. For controllers receiving a BAS-communicated
occupancy request, the function of BI3 is to change the mode from occu-
pied to occupied standby. (For more information on occupancy-related
functions, see “Occupancy modes” on page 36.)
BI3 is the only binary input that can be configured as generic. If config-
ured as a generic binary input, it can be monitored by a BAS and has no
direct effect on Tracer ZN521 operation.
BI4: Fan status
The fan status input provides feedback to the controller regarding the
fan’s operating status. If BI4 is wired to a fan status switch and the input
indicates that the fan is not operating when the controller has the fan
controlled to on, the controller will generate a Low AirFlow—Fan Failure
diagnostic. (For more information, see “Fan status” on page 49.)
- Installation and 1
- Operation 1
- Zone Controller 1
- CNT-SVX07C-EN 4
- WARNING 6
- CAUTION 6
- Contents 7
- CNT-SVX07C-EN iii 9
- Contents 10
- Overview and specifications 11
- Storage environment 12
- Dimensions 12
- Clearances 12
- Additional components 14
- Agency listing/compliance 14
- Damper actuators 15
- Zone humidity sensor 15
- 6 CNT-SVX07C-EN 16
- General wiring information 17
- IMPORTANT 18
- 10 CNT-SVX07C-EN 20
- Mounting the controller 21
- Mounting recommendations 22
- Input/output functions and 23
- Binary inputs 24
- BI4: Fan status 25
- Analog inputs 26
- SET: Local setpoint 27
- FAN: Fan mode input 27
- • A generic temperature input 28
- AI4: Universal 4–20 mA 29
- Binary outputs 31
- Overriding binary outputs 32
- CNT-SVX07C-EN 23 33
- 24 CNT-SVX07C-EN 34
- CNT-SVX07C-EN 25 35
- 26 CNT-SVX07C-EN 36
- CNT-SVX07C-EN 27 37
- 28 CNT-SVX07C-EN 38
- CNT-SVX07C-EN 29 39
- 30 CNT-SVX07C-EN 40
- CNT-SVX07C-EN 31 41
- 32 CNT-SVX07C-EN 42
- CNT-SVX07C-EN 33 43
- 34 CNT-SVX07C-EN 44
- Sequence of operations 45
- Occupancy modes 46
- Timed override control 47
- Zone temperature control 48
- Discharge air tempering 49
- Morning warm-up 49
- Morning cool-down 49
- Heating or cooling mode 49
- Fan operation 50
- Exhaust control 51
- Valve operation 52
- Two-position valve operation 53
- Isolation-valve operation 53
- Two-pipe operation 53
- Four-pipe operation 53
- ASHRAE Cycle 1 conformance 55
- ASHRAE Cycle 2 conformance 55
- Economizing (free cooling) 55
- DX cooling operation 56
- Electric heat operation 57
- Baseboard heat operation 57
- Dehumidification 57
- Peer-to-peer communication 58
- Unit protection strategies 58
- Smart reset 59
- Condensate overflow 59
- Fan status 59
- Fan off delay 59
- Filter-maintenance timer 60
- Freeze avoidance 60
- Status indicators for 61
- Manual output test 62
- 11 : E x i t 64
- Service pin button 66
- Interpreting LEDs 66
- Diagnostics 68
- Table of diagnostics 69
- 62 CNT-SVX07C-EN 72
- Troubleshooting 73
- Chapter 7 Troubleshooting 74
- Table 19. Valves remain open 75
- Numerics 79
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