Trane RTHC - Page 138

10 - 4 RTHC-IOM-1C
Table 32
Diagnostics
Diagnostic
Description
Diagnostic
Type
Shutdown
Action
Cause Help Message
At Speed Input
Shorted
MMR N/A a. The Up to Speed/At Speed input was found to be shorted before
the compressor was started.
b. Applies only to Solid State Starters
Check Aux Contact
on Bypass
Contactor
At Speed Input
Opened
MMR Immediate a. The At Speed input was found to be opened with the compressor
motor running after successfully obtaining at speed condition.
b. Applies only to Solid State Starters.
Check Aux Contact
on Bypass
Contactor
Check Clock IFW N/A On loss of power the clock does not keep time, if there is an
extended power loss (greater than 15 seconds) this diag. is also
generated to alert the operator to check the clock.
Check Main Power
Supply, Reset
Clock
Chilled Water
Flow Lost
MAR Immediate a. The chilled water flow switch input was open for more than 6-10
continuous seconds.
b. 6-10 seconds of continuous flow shall clear this diagnostic.
c. Even though the pump times out in the STOP modes, this
diagnostic shall not be called out in the STOP modes.
Check Pump,
Valves, Flow Switch
Chiller: Loss of
Comm with
Options
IFW N/A The chiller module lost communications with the Options module for
15 continuous seconds. This IFW diagnostic is generated if Free
Cooling is Not Installed, otherwise this is an MMR diagnostic.
Check IPC Wiring/
Connections
Chiller: Loss of
Comm with Local
CLD
IFW N/A The chiller module lost communications with the CLD module for 15
continuous seconds.
Check IPC Wiring/
Connections
Chiller: Loss of
Comm with TCI
IFW N/A The Tracer was setup as “installed” at the CLD and the chiller
module lost communications with the TCI (comm 3 or comm 4)
module for 15 continuous seconds
Check IPC Wiring/
Connections
Chiller: Loss of
Comm with TCI
IFW N/A The Tracer was setup as “installed” at the CLD and the chiller
module lost communications with the TCI (comm 3 or comm 4)
module for 15 continuous seconds
Check IPC Wiring/
Connections
Chiller: Loss of
Comm with
Rfgt Monitor
IFW-AR N/A The Chiller module lost communications with the Refrigerant Monitor
for 15 continuous seconds.
Check IPC Wiring/
Connections
Chiller: Loss of
Comm with
Starter
MMR Friendly The chiller module lost communications with the Starter module for
15 continuous seconds.
Check IPC Wiring/
Connections
Chiller: Loss of
Comm with
Stepper
MMR Friendly The chiller module lost communications with the Stepper #1 module
for 15 continuous seconds.
Check IPC Wiring/
Connections
Chiller Mod Off-
Brd 5V Range
IFW N/A An improper Off Board 5v voltage was detected at the Chiller
Module. A 5Vdc is used for certain system level components. The
micro checks to see that the A/D value falls within an acceptable
range.
Check Chiller
Module Voltages
Cprsr did not
Accelerate Fully
MMR Immediate a. The UCP2 did not receive an Up to Speed or At Speed Signal
(Aux contact from Bypass Contactor) within 2.5 seconds after
commanding bypass, or after the Maximum Acceleration Timer has
timed out, whichever is longer.
b. Applies only to Solid State Starters
Check Starter
Setup and Bypass
Aux Contact
Cprsr did not
Accelerate:
Shutdown
MMR Immediate a. The compressor did not come up to speed (get to <85%RLA) in
the allotted time defined by the Maximum Acceleration Timer.
b. The clear language display setups defined “Shutdown” as the
action when the Maximum Acceleration Timer was exceeded.
Check Main Power
Supply & Wiring
Cprsr Did Not
Accelerate:
Transition
(The Motor is put
across the line.)
IFW N/A a. The compressor did not come up to speed (get to <85% RLA) in
the allotted time defined by the Maximum Acceleration Timer.
b. The clear language display setups defined “Transition or Bypass”
as the action when the Maximum Acceleration Timer was exceeded.
See
Troubleshooting
Service Bulletin