Resetting Cooling And Ignition Lockouts - Trane YSC037E Installation, Operation And Maintenance Manual

the previous section for the recommended
troubleshooting procedure.
Heating Failure
Verify Heat Failure by Ignition Module (IGN) LED indicator:
OFF: No Power or Failure
ON: Normal
Slow Flash: Normal, Heat Call
Fast Flash: Error Code:
1 Flash: Communication Failure
2 Flashes: System Lockout
3 Flashes: Pressure Switch Fail
4 Flashes:TC01 orTC02 Open
5 Flashes: Flame w/o Gas Valve
6 Flashes: Flame Rollout Open
Cooling Failure
• Cooling and heating set point (slide pot) on the zone
sensor has failed. Refer to the "Zone SensorTest
Procedure" section.
• Zone temperature thermistor ZTEMP on ZTS failed.
Refer to the "Zone SensorTest Procedure" section.
• CC1 or CC2 24 VAC control circuit has opened, check
CC1 & CC2 coils, and any of the controls below that
apply to the unit (HPC1, HPC2).
• LPC1 has opened during the 3 minute minimum "on
time" during 4 consecutive compressor starts, check
LPC1 or LPC2 by testing voltage between the J1-1 & J3-
2 terminals on the RTRM and ground. If 24 VAC is
present, the LPC's has not tripped. If no voltage is
present, LPC's has tripped.
Service Failure
• If the supply fan proving switch has closed, the unit will
not operate (when connected to RTOM), check the fan
motor, belts, and proving switch.
• Clogged filter switch has closed, check the filters.
• If the condensate overflow switch is closed, the unit
will not operate. Make sure the float switch is not in a
tripped condition, and check for an "open" between
wires connecting to RTOM J6-1, J6-2 (ReliaTel™
controls).
Simultaneous Heat and Cool Failure
• Emergency Stop is activated
Method 2
The second method for determining system status is done
by checking voltage readings at the RTRM (J6).The system
indication descriptions and the approximate voltages are
listed below.
RT-SVX21N-EN
System Failure
• Measure the voltage between terminals J6-9 & J6-6.
• Normal Operation = approximately 32 VDC
• System Failure = less than 1 VDC, approximately 0.75
VDC
• Test Mode = voltage alternates between 32 VDC & 0.75
VDC
Heat Failure
• Measure the voltage between terminals J6-7 & J6-6.
• Heat Operating = approximately 32 VDC
• Heat Off = less than 1 VDC, approximately 0.75 VDC
• Heating Failure = voltage alternates between 32VDC &
0.75 VDC
Cool Failure
• Measure the voltage between terminals J6-8 & J6-6.
• Cool Operating = approximately 32 VDC
• Cool Off = less than 1 VDC, approximately 0.75 VDC
• Cooling Failure = voltage alternates between 32VDC &
0.75 VDC
Service Failure
• Measure the voltage between terminals J6-10 & J6-6.
• Clogged Filter = Approximately 32 VDC.
• Normal = Less than 1 VDC, approximately 0.75 VDC
Fan Failure = voltage alternates between 32VDC & 0.75
VDC.
To use LED's for quick status information at the unit,
purchase a BAYSENS110* ZSM and connect wires with
alligator clamps to terminals 6 through 10. Connected each
respective terminal wire (6 through 10) from the Zone
Sensor to the unit J6 terminals 6 through 10.
Note: If the system is equipped with a programmable
zone sensor, BAYSENS119* the LED indicators will
not function while the BAYSENS110* is connected.
Resetting Cooling and Ignition
Lockouts
Cooling Failures and Ignition Lockouts are reset in an
identical manner. Method 1 explains resetting the system
from the space; Method 2 explains resetting the system at
the unit.
Note: Before resetting Cooling Failures and Ignition
Lockouts check the Failure Status Diagnostics by
the methods previously explained. Diagnostics will
be lost when the power to the unit is disconnected.
Method 1
To reset the system from the space, turn the "Mode"
selection switch at the zone sensor to the "Off" position.
Troubleshooting
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