Installation Operation Maintenance

MaintenanceTroubleshootingThe RTRM has the ability to providethe service personnel with someunit diagnostics and system statusinformation. Before turning themain power disconnect switch "Off",follow the steps below to check theReliaTelRefrigeration Module (RTRM). Alldiagnostics & system statusinformation stored in the RTRM willbe lost when the main power isturned "Off".1. Verify that the Liteport LED onthe RTRM is burningcontinuously. If the LED is lit, goto Step 3.2. If the LED is not lit, verify that24 VAC is present between J1-1and J1-2. If 24 VAC is present,proceed to Step 3. If 24 VAC isnot present, check the unit mainpower supply, check transformer(TNS1). Proceed to Step 3 ifnecessary.3. Utilizing "Method 1" or"Method 2" in the system statusdiagnostic section, check thefollowing: System status,Heating status, Cooling status. Ifa System failure is indicated,proceed to Step 4. If no failuresare indicated, proceed to Step 5.4. If a System failure is indicated,recheck Steps 1 and 2. If the LEDis not lit in Step 1, and 24 VAC ispresent in Step 2, the RTRM hasfailed. Replace the RTRM.5. If no failures are indicated, useone of the TEST modeprocedures described in the unit"Start-Up" section to start theunit. This procedure will allowyou to check all of the RTRMoutputs, and all of the externalcontrols (relays, contactors, etc.)that the RTRM outputs energize,for each respective mode.Proceed to Step 6.6. Step the system through all ofthe available modes, and verifyoperation of all outputs, controls,and modes. If a problem inoperation is noted in any mode,you may leave the system in thatmode for up to one hour whiletroubleshooting. Refer to thesequence of operations for eachmode, to assist in verifyingproper operation. Make thenecessary repairs and proceed toSteps 7 and 8.7. If no abnormal operatingconditions appear in the testmode, exit the test mode byturning the power "Off" at themain power disconnect switch.8. Refer to the individualcomponent test procedures ifother microelectroniccomponents are suspect.System Status Checkout Procedure"System Status" is checked by usingone of the following two methods:Method 1If the Zone Sensor Module (ZSM) isequipped with a remote panel withLED status indication, you can checkthe unit within the space. If the ZSMdoes not have LED's, use Method 2.THS/P03 have the remote panelindication feature. The LEDdescriptions are listed below:LED 1 (System) "On" during normaloperation. "Off" if a system failureoccurs or the LED fails. "Flashing"indicates test mode.LED 2 (Heat) "On" when the heatcycle is operating. "Off" when theheat cycle terminates or the LEDfails. "Flashing" indicates a heatingfailure.LED 3 (Cool) "On" when the coolingcycle is operating. "Off" when thecooling cycle terminates or the LEDfails. "Flashing" indicates a coolingfailure.LED 4 (Service) "On" indicates aclogged filter. "Off" during normaloperation. "Flashing" indicates ansupply fan failure.62RT-SVX20B-E4