NS Sensors with Fault Code Capability Error Codes
The fault indication comes through the Network Sensor
Bus when a Network Sensor is used in the Zone. The
LCD indicates the code number for all the required
state of California Title 24 economizer fault conditions.
Table 2 describes the faults.
Table 2: Network Sensors with Fault Code Capability Error Codes
Display Text
California Title 24 Economizer
Fault Condition
EF1
Air temperature sensor failure/fault
EF5
Not economizing when it should
EF6
Economizing when it should
EF8
Damper not modulating
EF9
Excess outdoor air
Ordering Information
Table 3: Network Sensors with Fault Code Capability Ordering Information (Title 24 Models for
Economizer Fault Detection Diagnostics [FDD])
Product
Size (mm),
Code Number
Height x Width
NS-ATB7F03-0
80 x 80
NS-ATB7F03-1
80 x 80
NS-BTB7F03-0
80 x 120
NS-BTB7F03-1
80 x 120
Repair Information
If the Fault Code Network Sensor fails to operate within
its specifications, replace the unit. For a replacement
network sensor, contact the nearest Johnson Controls
representative.
NS Series Network Sensors with Fault Code Capability Installation Instructions
Possible Problem
Problem with one of the air temperature sensors. Check
Outdoor Air, Return Air, or Supply Air sensors.
The economizer is not using outdoor air when it should.
The economizer is allowing outdoor air inside when the
conditions are not suitable for economizer operation.
The economizer damper is not able to modulate properly.
Check damper, linkage to actuator, or the actuator.
The economizer is allowing excess outdoor air inside.
Vertical
LCD
Screw
Wallbox-
Display,
Terminals
Mounted
F/C Scale
(WB)
Toggle
Yes
Yes, Yes
Yes
Yes
Yes, Yes
Yes
Yes
Yes, Yes
Yes
Yes
Yes, Yes
Yes
Address
Temperature
Switches
Adjustment:
Setpoint (Set)
or Warmer/
Cooler Dial
(W/C)
Yes
Set
Yes
Set
Yes
Set
Yes
Set
Johnson
VAV
Controls
Balancing
Logo
Feature
Yes
No
No
No
Yes
No
No
No
5
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