Trane IntelliPak SCRF 25, Installation, Operation And Maintenance Manual, Page: 113 / 120

SCXF-SVX01Q-EN 113
Category Diagnostic
Reaction
The minimum airflow control function is disabled. The outside air damper minimum position function reverts to using the O/A
flow compensation function if O/A flow compensation is enabled or to the default minimum position function if O/A flow
compensation is disabled or not available.
Reset
Required
(PAR) An automatic reset occurs after the designated space pressure transducer sends a signal within range for 10 continuous
seconds.
VOM Communications Failure
Problem The RTM has lost communication with the VCM.
Check
Field/unit wiring between RTM and VCM.
Reason for
Diagnostic
The RTM has lost communications with the VOM.
Controls
Reaction
Ventilation override actions will not be allowed, and the VO Output relay will be de-energized.
Reset
Required
(PAR) An automatic reset occurs after communication has been restored.
W
WSM Communications Fail
Problem The RTM has lost communication with the WSM.
Check
Field/unit wiring between RTM and WSM.
Reason for
Diagnostic
RTM has lost communication with WSM.
Controls
Reaction
UCM will react as if a freezestat has occurred by issuing:
• “All heat on” or “mod output full open” request to “heat control”
• A “fan off” request to “supply fan control”
• “Close damper” request to “economizer actuator control”
• Water pump to turn on and position all water valves to provide maximum flow through all water source heat exchangers
• Disables preheat function if WSM mixed air temp sensor is selected as preheat sensor
Reset
Required
An automatic reset occurs after one complete set of IPC packets is received.
WSM Mixed Air Temp Sensor Fail
Activation
Conditions
Temperature <-50°F or temperature >209°F, and sensor is selected for use by “waterside economizer temperature enable
function” or “preheat function”
Time to
React
10 sec < T < 20 sec
Actions to
be Initiated
“Waterside economizer temperature enable function” uses supply air cooling setpoint instead of mixed air temperature. If
mixed air temperature is used for “preheat function”, issue a “disable” request to “preheat function”.
Reset
An automatic reset occurs after mixed air temp. input returns to within range continuously for 10 seconds.
Water Flow Fail
Data used
(module,
packet,
byte, bit)
WSM, 01,19, 05
Activation
Conditions
Water flow input is detected open:
• At the end of pre-cool water flow initiation state, or
• Continuously for five minutes while:
– Water side economizer is open 100%,
– Presetting of a head pressure valve, or
–
Demand for mechanical cooling.
D Diia ag gn no ossttiiccss