94
SCXF-SVX01T-EN
Category Diagnostic
Time to React 10 sec < T < 20 sec
Diagnostic
Text
(Human
Interface
Display)
“ENT COND WATER TEMP SENSOR FAIL”
Actions to be
Initiated
A “Lockout All Ckts” request is issued to the “Compressor Staging Function”
Reset
An automatic reset occurs after the entering condenser water temperature input returns to within range continuously for 15 seconds.
Entering Water Temperature Sensor Fail
Data used
(module,
packet, byte,
bit)
WSM, 01,18,05
Activation
Conditions
Temperature < -50°F or temperature > 209°F, and unit configured with water cooled condenser and/or economizer
Time to React 10 sec < T < 20 sec
Diagnostic
Text
(Human
Interface
Display)
“ENTERING WATER TEMP SENSOR FAIL”
Actions to be
Initiated
A “Disable Water Side Economizer” request is issued to “Water Side Economizer Temperature Enable Function”
Reset
An automatic reset occurs after the Entering Water Temp. input returns to within range continuously for 10 seconds.
Evaporator Temperature Sensor Failure—Circuit 1, 2, 3, or 4
Problem
The evaporator temperature sensor (ckt #1, 2, 3, or 4) is out of range.
Check
Sensor resistance should be between 830 ohms (200°F) and 345.7Kohms (-40°F). If so, check field/unit wiring between sensor and MCM/
SCM.
Reason for
Diagnostic
The unit is reading a signal that is out of range for the circuit #1 evaporator temperature sensor input (temp < -55°F or temp > 209°F).
Controls
Reaction
The coil frost protection function for the refrigeration circuit (#1, 2, 3, or 4) only is disabled.
Reset
Required
(PAR) An automatic reset occurs after the #1, 2, 3, or 4 evaporator temp input returns to its allowable range for 10 seconds.
G
GBAS 0-5 VDC Module Communication Failure
Problem The RTM has lost communication with the GBAS module.
Check
Field/unit wiring between RTM and GBAS.
Reason for
Diagnostic
The RTM has lost communication with the GBAS module.
Reaction
The UCM will initiate the following actions;
• If the demand limit input was closed prior to the communications loss, then the demand limit commands issued to the heat operation
function (if applicable) and the compressor staging/chilled water cooling function will be cancelled.
• If any of the GBAS setpoint control parameters are the HI-selected setpoint sources, then those setpoints will revert to the default HI
setpoints.
• Any active GBAS output control parameters will be ignored.
• A failsafe function in the GBAS module will cause all GBAS outputs to be zeroed and de-energized.
Reset
Required
(PAR) An automatic reset occurs after communication has been restored.
Diagnostics
To Next Page
Loading...