SCXF-SVX01Q-EN
107
Category
Diagnostic
Reaction
A “Lockout” request is sent to the compressor staging control function. And a fail-safe function in the MCM will cause all MCM
outputs to be zeroed and de-energized.
Reset
Required
(PAR) An automatic reset occurs after communication has been restored.
Mode Input Failure
Problem
The RTM mode input is out of range.
Check
Sensor resistance should be between 1 ohm and 40 ohms. If so, check field/unit wiring between sensor and RTM.
Reason for
Diagnostic
The mode input signal on the RTM is out of range (resistance < 1 ohm or resistance > 40 ohms).
Controls
Reaction
The system mode reverts to the default (HI set) system mode.
Reset
Required
(INFO) An automatic reset occurs after the mode input returns to its allowable range for 10 seconds.
N
NSB Panel Zone Temperature Sensor Failure
Problem
The NSB panel's zone temp sensor input is out of range. (This input is at the NSB panel, not on the unit itself).
Check
If have an external sensor connected to the NSB panel zone sensor input, then the internal NSB panel zone sensor should be
disabled. Verify sensor resistance. If in valid range, check wiring between the sensor and NSB panel.
NSB Panel Comm Failure
Problem
The RTM has lost communications with the night setback panel (programmable zone sensor).
Check
Field/unit wiring between RTM and NSB Panel.
Reason for
Diagnostic
The RTM has lost communication with the NSB panel.
Controls
Reaction
The unit reverts to the next lower priority mode switching source (typically the HI default mode). If the NSB panel zone sensor
is the designated sensor source for any functions, those functions are disabled.
Reset
Required
(PAR) An automatic reset occurs after communication has been restored.
O
O/A Humidity Sensor Failure
Problem
The outside air humidity sensor data is out of range.
Check
Check field/unit wiring between the sensor and RTM.
Reason for
Diagnostic
The unit is reading a signal that is out of range for the outside air humidity sensor (humidity < 5% or humidity > 100%).
Controls
Reaction
The economizer enable enthalpy function reverts to dry-bulb temperature changeover (“Level 1”) control.
Reset
Required
(PAR) An automatic reset occurs after the OA humidity input returns to its allowable range for 10 seconds.
O/A Temp. Sensor Failure
Problem
The outside air temperature sensor input is out of range.
Check
Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F). If so, check field/unit wiring between sensor
and RTM.
Reason for
Diagnostic
The unit is reading a signal that is out of range for the outside air temperature input on the RTM (temp. < -55°F or temp > 209°
F).
Содержание IntelliPak SCRF 25
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