Troubleshooting; Reliatel Control; System Status Checkout Procedure - Trane TH 150-300 Series Installation, Operation And Maintenance Manual

Troubleshooting

WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this section of the manual could result
in exposure to electrical, mechanical or other potential
safety hazards. Always refer to the safety warnings
provided throughout this manual concerning these
procedures. Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks. Failure to follow all of the recommended safety
warnings provided, could result in death or serious
injury.

ReliaTel Control

The RTRM has the ability to provide the service personnel
with some unit diagnostics and system status information.
Before turning the main power disconnect switch "Off" ,
follow the steps below to check the ReliaTel™
Refrigeration Module (RTRM). All diagnostics and system
status information stored in the RTRM will be lost when
the main power is turned "Off" .
To prevent injury or death from electrocution, it is the
responsibility of the technician to recognize this hazard
and use extreme care when performing service
procedures with the electrical power energized.
1. Verify that the Liteport LED on the RTRM is burning
continuously. If the LED is lit, go to
2. If the LED is not lit, verify that 24 Vac is presence
between J1-1 and J1-2. If 24 Vac is present, proceed to
Step 3.
If 24 Vac is not present, check the unit main power
supply, check transformer (TNS1). Proceed to
necessary.
3. Utilizing "Method 1" or "Method 2" in the "System
Status Checkout Procedure, check the following:
System status
Heating status
Cooling status
If a System failure is indicated, proceed to
failures are indicated, proceed to
4. If a System failure is indicated, recheck
2. If the LED is not lit in
Step 2, the RTRM has failed. Replace the RTRM.
5. If no failures are indicated, use one of the TEST mode
procedures described in
42
Step 3.
Step 3
Step 4. If no
Step 5.
Step 1 and
Step 1, and 24 Vac is present in
"Start Up, " p. 35 to start the
unit. This procedure will allow you to check all of the
RTRM outputs, and all of the external controls (relays,
contactors, etc.) that the RTRM outputs energize, for
each respective mode. Proceed to
6. Step the system through all of the available modes,
and verify operation of all outputs, controls, and
modes. If a problem in operation is noted in any mode,
you may leave the system in that mode for up to one
hour while troubleshooting. Refer to the sequence of
operations for each mode, to assist in verifying proper
operation. Make the necessary repairs and proceed to
Step 7 and Step
7. If no abnormal operating conditions appear in the test
mode, exit the test mode by turning the power "Off" at
the main power disconnect switch.
8. Refer to the individual component test procedures if
other microelectronic components are suspect.
System Status Checkout
Procedure
"System Status" is checked by using one of the following
two methods:
Method 1
If the Zone Sensor Module (ZSM) is equipped with a
remote panel with LED status indication, you can check the
unit within the space. If the ZSM does not have LEDs, use
"Method 2, " p. 43.
BAYSENS110* and BAYSENS119* have the remote panel
indication feature.
The LED descriptions are listed below.
• LED 1 (System)
– "On" during normal operation.
– "Off" if a system failure occurs or the LED fails.
– "Flashing" indicates test mode.
• LED 2 (Heat)
if
– "On" when the heat cycle is operating.
– "Off" when the heat cycle terminates or the LED
fails.
– "Flashing" indicates a heating failure.
• LED 3 (Cool)
– "On" when the cooling cycle is operating.
– "Off" when the cooling cycle terminates or the LED
fails.
– "Flashing" indicates a cooling failure.
Step
• LED 4 (Service)
– "On" indicates a clogged filter.
– "Off" during normal operation.
Step 6.
8.
RT-SVX25J-EN