Trane IntelliPak I Programming, Troubleshooting Manual page 143

DIAGNOSTIC DISPLAYED
Unit HI Communications
Failure
Problem: The RTM has lost
communications with the Unit
mounted (local) Human
Interface (HI).
Check: Field/unit wiring
between RTM and Local HI.
VCM Aux Temp. Sensor
Failure.
Problem: The VCM Auxiliary
Temperature sensor data 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
VCM.
VCM Communications
Failure.
Problem: There has been a
loss of communications
between the VCM and the
RTM.
Check wiring between VCM
and RTM.
Velocity Pressure Sensor
Failure
Problem: The Velocity
Pressure input signal is out of
range.
Check: Check field/unit wiring
between Sensor and VCM.
RT-SVP04F-EN
REASON FOR DIAGNOSTIC
The RTM has lost
communications with the unit-
mounted Human Interface.
At least one enabled unit
function has the VCM Auxiliary
Temperature input designated
as its sensor, and the unit is
reading a signal that is out of
range for this input
(Temperature < -40F or
Temperature > 200 F).
There has been a loss of
communications between the
VCM and the RTM.
The unit is reading a signal
that is out of range for the
Velocity Pressure transducer
input (During calibration: V <
40 mV or V > 420 mV, During
operational times: V < 40 mV
or V > 0.75 V).
System Testing & Troubleshooting
UCM'S REACTION
A fail-safe function in the HI
will;
a. disallow any interaction
between the HI and the
RTM (or any other
modules),
b. render all HI keystrokes
ineffective, and
c. cause the following to be
displayed on the unit-
mounted HI display:
LOCAL HI COMMUNICATIONS
LOSS CHECK COMM LINK
WIRING BETWEEN MODULES
(If the unit has a remote HI
option, then on the remote
HI module, this diagnostic
will be reported and
displayed as any other
automatic reset diagnostic.
The functions with the VCM
Aux Temperature input
designated as their sensor are
disabled.
Fresh Air Management with
DCV or OA Damper Min.
Position with DCV will be
disabled.
The Minimum Airflow Control
Function is disabled. The
Outside Air Damper Minimum
Position function will revert to
using the OA Flow
compensation function if OA
Flow Compensation is
ENABLED or to the default
minimum position function if
OA Flow Compensation is
DISABLED or not available.
RESET REQUIRED
(INFO) An automatic reset
occurs after communication
has been restored between
the RTM and the HI. When the
failure screen is cleared, the
General display is restored and
HI interaction with the
interaction with the RTM is
again permitted.
PAR) An automatic reset
occurs after the designated
Zone Temperature input
returns to its allowable range.
In order to prevent rapid
cycling of the Diagnostic, there
is a 10 seconds delay before
the automatic reset.
PAR) An automatic reset
occurs after communication
has been restored.
(PAR) An automatic reset
occurs after the designated
Space Pressure transducer
sends a signal within range for
10 continuous seconds.
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