128 RT-SVX34C-EN
Diagnostics
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 Unit
Control. All diagnostics and system status information stored in the RTRM will be lost when the
main power is turned "Off".
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it may be necessary
to work with live electrical components. Have a qualified licensed electrician or other individual
who has been properly trained in handling live electrical components perform these tasks.
Failure to follow all electrical safety precautions when exposed to live electrical components
could result in death or serious injury.
HIGH VOLTAGE IS PRESENT AT TERMINAL BLOCK HTB1 OR UNIT DISCONNECT SWITCH.
1. Verify that the LED on the RTRM is on. If the LED is on or blinking (2 blinks every 2 seconds).
If so, go to step 3.
2. If the LED is not on, verify that 24 VAC is present between RTRM 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) and fuse. If the LED is not on or blinking yet 24VAC is present, the RTRM
has failed and must be replaced.
3. If the LED is blinking, a diagnostic is definitely present. If the LED is on, certain diagnostics may
still be present. Utilizing "Method 1" or "Method 2" in the “System Status Diagnostic” section,
check the following system status:
• Service status
• Heating status
• Cooling status
If any diagnostic is seen, refer to the appropriate Diagnostics section for CV units or VAV units.
Once the condition causing the diagnostic is cleared, proceed to step 5.
4. If any diagnostic is seen, refer to the appropriate Diagnostics section for CV units or VAV units.
Once the condition causing the diagnostic is cleared, proceed to step 5.
5. If no diagnostics are present, use one of the TEST mode procedures described in the "Unit
Startup" section 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 Step 6.
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 Steps
7 and 8.
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/Diagnostics
System status and/or diagnostics can be observed at the ZSM, through ICS, or at the unit by using
a DC voltmeter. The LED on the RTRM module does not indicate whether diagnostics are present
or not. This RTRM LED is an indicator that the RTRM has power, and it pulses during the TEST mode.
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