Bulletin 30-121.019
39
Copyright © 2015 Unico, Inc.
(SAC 37.4255.109.02)
IndoorB board
Legend
F1: Fuse, 5x20mm, fast acting, 3.15A,
250V (Buss Type S500 “F3.15AL250V” or equal)
F2: Fuse, 5x20mm, fast acting, 100mA, 250V
(Buss Type S500 “F100mAL250V” or equal)
Connectors
J1: Alarm output, 230V
J2: Drain pump (condensate) output, 230V
J3: Power, 12V to motor adapter “voltage lift board (VLB)”
J4: Communication cable to MMI (button) board or Remote IR receiver
J5: Boiler Changeover jumper position
J6: Not used
J7: Not used
J8: Power input, 230V (L)
J9: Power input, 230V (N)
J10: Not used
J11: Communication cable to relay board (output) to enable auxiliary heat
J12: Not used (output)
J13: Not used (output)
J14: Return air temperature (RAT) sensor mounted in coil section
J15: Indoor coil temperature (ICT) sensor mounted on coil
J16: Communication cable to motor connected to VLB motor adapter board
J17: Communication cable to relay board (input) for thermostat O input
J18: Communication mode, must be set to RS232
J19: Not used
J20: Communication to outdoor unit (C1 and C2)
J21: Input to enable system (turns on fan)
J22: Input for float switch (condensate overflow)
J23: Factory use only (programming)
J24: Input to select the thermostat type (either iSeries thermostat or standard heat pump thermostat)
J25: (Future) damper output
J26: Not used (output)
J27: Not used (output)
Jumpers
JP1: input (either for remote channel or for low heat/cool)
JP2: input (either for remote channel or for high heat/cool)
JP3: factory use only (must have a jumper)
JP4: factory use only (no jumper)