Trane RTHC - Page 99

Diagnostic Table
RTHC-SVD01B-EN 93
Cond Leaving
Wtr Temp
Sensor
IFW
n/a
Chiller
1U1
All Open or Short. Check sensor, wiring
and connections.
Condenser
Rfgt Temp
Sensor
MMR
friendly
Stepper
1U3
All Open or Short Check sensor, wiring
and connections.
Condenser
Water Flow
Lost
MAR
friendly
Chiller
1U1
Start and All
Run Modes
The condenser water flow switch input was
open for more than 6-10 contiguous
seconds, 6-10 seconds of contiguous flow
shall clear this diagnostic.
Check pumps, valves,
and flow switch
Condenser
Water Flow
Overdue
MMR
friendly
Chiller
1U1
Estab. Cond
Water Flow
Condenser water flow was not proven
within 4.25 minutes of the condenser pump
relay being energized.
Check pumps, valves,
and flow switch
Cprsr did not
Accelerate
Fully
MMR
n/a
Starter
1U2
Starting Used with Solid State Starters only. The
UCM did not receive an Up to Speed or At
Speed Signal within the Maximum
Acceleration Timer Setting. Up to speed or
At speed signals are received at the Starter
module on J4-1 and 2.
Determine if SSS is
ramping properly.
Confirm compressor is
starting unloaded.
Confirm operation of
current transformers.
Refer to Starter module
checkout.
Cprsr did not
Accelerate:
Shutdown
MMR
immediate
Starter
1U2
Start Mode The compressor did not come up to speed
(get to <85% RLA) in the allotted time
defined by the Maximum Acceleration
Timer. The Human Interface setups defined
“Shutdown” as the action when the
Maximum Acceleration Timer was
exceeded.
The 1K2 aux contacts
did not close in the
allotted time. Check
main power supply &
wiring. Check 1K2 aux.
contacts. Check Starter
module.
Cprsr Did Not
Accelerate:
Transition (The
Motor is put
across the
line.)
IFW
n/a
Starter
1U2
Start Mode The compressor did not come up to speed
(get to <85% RLA) in the allotted time
defined by the Maximum Acceleration
Timer. The Human Interface setups defined
“Transition” as the action when the
Maximum Acceleration Timer was
exceeded.
The 1K2 aux. contacts
did not close in the
allotted time. Check
main power supply &
wiring. Check 1K2 aux.
contacts. Check Starter
module.
Current
Overload
MMR
immediate
Starter
1U2
All Running
Modes
Motor current exceeded overload time vs.
trip characteristic.
Check CT's. Confirm
compressor is starting
unloaded. Confirm
refrigerant charge and
overload settings.
Table 14-2: Diagnostic Table
Diagnostic
Description
Type/
Shutdown
Action
Module
Calling
Out Diag.
Operating
Modes
Diagnostic is
Active
Cause Help Message