T-M50 / T-M50 ASME Service Manual
Ver. 1.05
53
CONFIDENTIAL
C. With multi-unit system installations:
Example: If Unit #2 fails on the “321” error (inlet thermistor). See the pictures below.
Central computer board: The unit that has the error in the multi-unit system will display the error
code on its 7-Seg LED in exactly the same way as if it were only a single Unit. So, in this example, the
7-Seg LED on Unit #2 will display “3”…. “2”…. “1”, just like in the single-unit example above.
When the right and/or left combustion section has an error code, the red lamp next to the 7-Seg
LED on the central computer board will flash to indicate which combustion section has the error
code. Refer to p.49.
Remote controller: The remote controller will display “232” on its screen in its entirety. The first “2”
indicates that Unit #2 has the error. The “32” indicates the first two digits of the “321” error code.
Multi-unit controller (TM-MC01): The Unit # LED on multi-unit controller will flash to inform which
T-M50 has the error code. The multi-unit controller does not display the actual error codes on its 7-seg
LED. The remote controller will display the error codes instead.
Multi unit
Controller
T-M50
#2
T-M50
#1
T-M50
#3
Remote
Computer board of multi-unit
controller (TM-MC01)
Unit No.
Mode
Set
Error
recall
Alarm
reset
Clear error
memory
Priolity
set
Remote control
(RE10)
Pump
test
Multi-system
alarm
test
Freeze
protection
store
Re-cir
2unit
priority
Energy
saving
Select by pulling
out connecter
Unit1
Unit2 Unit3 Unit4 Unit5
Unit10
Unit9
Unit8
Unit7
Unit6
Unit15
Unit14
Unit13
Unit12
Unit11
Unit20
Unit19
Unit18
Unit17
Unit16
7 - s e g L E D
The Unit# LEDs
