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CNT-SVX07C-EN, N512, Zone Controller
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Chapter 7 Troubleshooting
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CNT-SVX07C-EN
Contents
Main
Page
Page
Page
CNT-SVX07C-EN
NOTICE:
Contents
Chapter 1 Overview and specifications . . . . . . . . . . . . . . . . . . 1
Chapter 2 General wiring information . . . . . . . . . . . . . . . . . . . 7
Chapter 3 Mounting the controller . . . . . . . . . . . . . . . . . . . . 11
Chapter 5 Sequence of operations . . . . . . . . . . . . . . . . . . . . 35
Page
Page
Chapter 1
Overview and specifications
Product description
Storage environment
Dimensions
Clearances
Clearances
Figure 1. Plastic-cover model dimensions and clearances
Figure 2. Metal-cover model dimensions and clearances
Agency listing/compliance
Additional components
Power transformer
Water, duct, and outdoor-air temperature sensors
Binary input switching devices
Damper actuators
Zone humidity sensor
CO2 sensor
Page
Chapter 2
General wiring information
Input/output terminal wiring
AC-power wi ring
WARNING
HAZARDOUS VOLTAGE!
CAUTION
Communication-link wiring and addressing
Page
Chapter 3
Mounting the controller
Location recommendations
Operating environment requirements
Mounting recommendations
CAUTION
Chapter 4
Input/output functions and wiring for typical applications
Binary inputs
BI1: Low-coil -temperature detecti on
BI2: Condensate overflow
BI3: Occupancy or generic binary input
BI4: Fan status
Analog inputs
GND: Ground terminals
ZN: Zone temperature
SET: Local setpoint
FAN: Fan mode input
AI1: Entering wa ter temperature
AI2: Discharge air temperature
AI3: Outdoor air temperature or generic temperature
AI4: Universal 420 mA
Page
Binary outputs
Generic binary output
Overriding binary outputs
Wiring requirements and options
CNT-SVX07C-EN 23
Figure 7. Two-pipe hydronic-cooling unit
24 CNT-SVX07C-EN
Figure 8. Two-pipe hydronic-heating unit
CNT-SVX07C-EN 25
Figure 9. Two-pipe hydronic heating/cooling unit with auto changeover
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Figure 10. Four-pipe hydronic heating/cooling unit
CNT-SVX07C-EN 27
Figure 11. Four-pipe heating/cooling unit with auto changeover
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Figure 12. Two-pipe heating unit with DX cooling
}
CNT-SVX07C-EN 29
Figure 13. Electric heat unit with DX cooling
}
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Figure 14. Electric heat unit
CNT-SVX07C-EN 31
Figure 15. Two-pipe heating unit with face-and-bypass damper
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Figure 16. Two-pipe heating/cooling unit with face-and-bypass damper
CNT-SVX07C-EN 33
Figure 17. Four-pipe heating/cooling unit with face-and-bypass damper
Page
Chapter 5
Sequence of operations
Power-up sequence
Random start
Occupancy modes
Occupied mode
Unoccupied mode
Occupied standby mode
Timed override control
Zone temperature control
Cascade zone control
Simplified zone control
Discharge air tempering
Morni ng warm-u p
Morning cool-down
Heating or cooling mode
Entering wat er temperature samp ling function
Fan operation
Exhaust control
Valve operation
Modulating valve operation
Modulating valve calibration
Two-position valve operation
Isolation-valve operation
Modulating outdoor/return air dampers
Chapter 5 Sequence of operations
Table 10. Relationship between outdoor temperature sensors and damper position
ASHRAE Cycle 1 conformance
ASHRAE Cycle 2 conformance
Economizing (free cooling)
Two-position control of a modulating outdoor air damper
Face-and-bypass damper operation
Face-and-bypass, isolation-valve operation
DX cooling operation
Electric heat operation
Baseboard heat operation
Dehumidification
Peer-to-peer communication
Unit protection strategies
Smart reset
Low-coil-temperature protection
Condensate overflow
Fan status
Fan off delay
Filter-maintenance timer
Freeze avoidance
Freeze protection (discharge air temperature low limit)
Chapter 6
Status indicators for operation and communication
Test button
Manual output test
Manual output test
Table 11. Manual output test sequence for non-face-and-bypass configurations
Chapter 6 Status indicators for operation and communication
Table 11. Manual output test sequence for non-face-and-bypass configurations
Manual output test
Service pin button
Interpreting LEDs
Page
Diagnostics
Types of diagnostics
Smart reset diagnostics
Informational diagnostics
Table of diagnostics
Chapter 6 Status indicators for operation and communication
Table 16. Diagnostics (Continued)
Diagnostics
Table 16. Diagnostics (Continued)
Page
Chapter 7
Troubleshooting
Chapter 7 Troubleshooting
Table 18. Valves remain closed
Table 17. Fan does not energize (Continued)
Troubleshooting
Table 19. Valves remain open
Table 20. DX or electric heat does not energize
Chapter 7 Troubleshooting
Table 21. Outdoor air damper remains closed
Table 22. Outdoor air damper remains open
Table 20. DX or electric heat does not energize (Continued)
Troubleshooting
Table 22. Outdoor air damper remains open (Continued)
Page
Index
Numerics
A
B
C
D
E
F
G
H
M
N
O
P
R
T
U
V
W
Z
