Trane ReliaTel - Page 87

RT-SVD03G-EN 87
COMM3/4 Interface Operation & Troubleshooting
Won’t communicate with Tracer SUMMIT:
• Harness, labeled 4366-1151, must be plugged into RTRM correctly – see above.
• Com Link board must be in “NON ISOLATED COMM3 or COMM4” position. If it is in the wrong
position or not installed, the unit will not communicate.
• Each unit must have a unique address by setting the DIP switches according to the IOM. If 2 units
have the same address, neither will communicate. If the unit has a DIP switch setting other than
the ones specified in the IOM, Tracer will not recognize it.
• Once the unit communicates with Tracer, the Tracer panel will automatically recognize the unit.
Won’t communicate with VariTrac CCP zoning system:
• Harness, labeled 4366-1151, must be plugged into RTRM correctly – see above.
• Com Link board must be in “NON ISOLATED COMM3 or COMM4” position. If it is in the wrong
position or not installed, the unit will not communicate.
VariTrac I Comfort Manager and VariTrac II Center Control Panel:
• The DIP switches must all be in the ON position. If not, the VariTrac CCP will not recognize it.
• The communication wires must be in the same daisy chain link as the dampers.
• VariTrac III central control panel (optional touch screen) — All DIP switches must be in the off
position. If not, the VariTrac CCP will not recognize it.
Communicates but will not run, even in TEST mode:
• Emergency stop input is open (RTRM 3J1-12).
Communicates but will not run; fan (but not heating or cooling) runs in TEST
mode for 40 seconds only:
3-25 Tons.
• Fan proving circuit (RTOM 5J7-6) is closed; should open when fan is on. If not, the fan will run
in TEST mode for 40 seconds and then stop.
27½-50 Tons.
• Fan proving circuit (RTOM 5J7-6) is opened; should close when fan is on. If not, the fan will run
in TEST mode for 40 seconds and then stop.
Communicates but will not run compressor(s); fan and heating run in TEST
mode:
• Compressor disable circuit(s) (RTRM 3J1-8, 3J3-2) open due to loss of charge or LTB jumper
removal.
Communicates but will not run compressors, yet everything runs in TEST
mode:
• FROSTAT circuit (RTOM 5J7-2) is closed; should open when indoor coil is frost free. Prior to
RTRM v8.0, there is no diagnostic output when this occurs.
• 27.5-50 Tons VariTrac CCP with constant volume unit with bypass VAV: Unit must have a
discharge air sensor installed at RTOM J4-4, J4-5.