Troubleshooting; Standard Troubleshooting; Ignition Module; Failures - Trane Foundation GCC180-300 Installation Operation & Maintenance

Troubleshooting

WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical
hazards, MUST follow precautions in this manual and
on the tags, stickers, and labels, as well as the
following instructions: 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.

Standard Troubleshooting

Ignition Module

The Ignition Module (IGN) 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 IGN.
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 LED on face of the phase monitor is green. If
LED is red, correct supply power fault.
2. Verify that the LED on the IGN is burning continuously.
If the LED is lit, go to Step 4.
3. If the LED is not lit, verify that 24 Vac is present
between R and B. If the LED is not lit and 24 Vac is
present replace the IGN. If 24 Vac is not present, check
transformer (TNS1). Proceed to Step 4 if necessary.
4. If no failures are indicated, use the TEST mode
procedures described in the "Unit Start-Up" section or
thermostat to start the unit. This procedure will allow
you to check all of the external controls (relays,
contactors, etc) and the IGN.
5. Test the system through all of the available modes, and
verify operation of all outputs, controls, and modes.
Refer to the sequence of operations for each mode, to
assist in verifying proper operation. Make the
necessary repairs and proceed to Step 6 and Step 7.
6. If no abnormal operating conditions appear in the test
mode, exit the test mode by turning the power "Off" at
44
the main power disconnect switch and removing the
test mode connections.
7. Refer to the individual component test procedures if
other components are suspect.

Failures

Heating Failure
Verify Heat Failure by Ignition Module (IGN) LED indicator:
OFF: No Power or Failure
Continued ON: No Communication
Slow Flash: Normal, Heat Call
Fast Flash: Error Code:
1 Flash: System Lockout
2 Flash: Pressure Switch Fail
3 Flash: Primary Limit Open
4 Flash: Flame detected when gas valve is not open
5 Flash: Flame Rollout Open
6 Flash: W2 signal but no W1 signal
Cooling Failure
1. Cooling and heating set points (slide pot) on the
thermostat have failed.
Note: Not used on electromechanical units.
2. CC1 or CC2 24 Vac control circuit has opened. Check
CC1 and CC2 coils and Frostat™ status. Check the
status of the LED indicator in LSD:
a. LED will be flashing to indicate that a Safety Input
has opened while a Y call is present.
b. Compressor lockout is indicated by a solid
(nonflashing) red LED.
To reset LSD - Power cycle on 'R' input.
Simultaneous Heat and Cool Failure
Emergency Stop is activated.
Low Leak Economizer – (LLE)
Troubleshooting
1. The economizer controller provides alarm messages
that display on the 2-line LCD. If one or more alarms
are present and there has been no keypad activity for
at least 5 minutes, the Alarms menu displays and
cycles through the active alarms.
Note: Note: You can also navigate to the Alarms menu
at any time.
2. Once the alarm has been identified and the cause has
been removed (for example, replaced faulty sensor),
the alarm can be cleared from the display.
RT-SVX51L-EN