Portable Dryer Troubleshooting
89

Input/Output Board 12 Volt

THESE JUMPERS MUST BE INSTALLED
J1-1 TO J1-17 - USER SAFETY
J1-1 TO J1-16 - MERCOID SAFETY
AC NEUTRAL
RL1-A N.O. HIGH SPEED POT B
RL1-A N.C. LOW SPEED POT B
RL1-B N.O. HIGH SPEED POT A
RL1-B N.C. LOW SPEED POT A
RL1-B COMMON TO POT INPUT ON SCR BOARD
RL1-A COMMON TO POT INPUT ON SCR BOARD
R
E
L
A
Y
120 VOLT AC OUTPUT12 VOLT DC INPUT
DATA INTERLINK CABLE CONNECTION
AC NEUTRAL
120V INPUT FROM CPU
AC NEUTRAL
N.C. (TIED TO J3-19)
N.C. (TIED TO J3-19)
FAN NEUTRAL
TRIAC SPARE
LOAD AUGER NEUTRAL
LOAD POWER AC NEUTRAL
MOISTURE CONTROL HOLDING LIGHT
AC NEUTRAL
PROOF OF AIRFLOW LIGHT
AC NEUTRAL
PROOF OF FLAME LIGHT
AC NEUTRAL
MAXON VALVE/DRYER RUNNING LIGHT
UNLOAD AUGER POWER UNLOAD AUGER NEUTRAL
2
4
68
101214161820
19 17 15 13 11 9 7 531
12 VDC
12 VDC
SPARE
USER SAFETY INPUT
MERCOID SAFETY INPUT
SPARE
MOISTURE CONTROL ON
VAPOR HIGH LIMIT INPUT
DRYER EMPTY (BATCH ONLY)
CONTINUOUS FLOW
LOAD AUTO
LOAD ON
UNLOAD 2 SPEED
UNLOAD 1 SPEED
BURNER AUTO
BURNER ON
FAN AUTO
FAN ON
12 VDC 12 VDC

3 AMP FUSE

2
4
68
101214161820
19 17 15 13 11 9 7 531

J4 J3

J1

J2 J5

Competitor Wiring Reference