– 58 –
7. Drain pump trial run switch
● This switch forcibly turns the drain pump on. When the drain pump trial run switch is turned on, the
timer indicator will blink seven times, and no remote signal will be accepted.
0V
5V
R533
Drain pump
trial run SW
(normally, Hi)
R534
Microcomputer
52
8. Float switch
● This is a float type switch that monitors the drain level of drain pan. The switch will be activated and
will stop operation if the drain pump is faulty or drain hose is stopped up, disabling drainage, causing the
drain level to rise abnormally.
● When the float switch is activated, the timer indicator will flash six times. Note that the float switch will
also be activated, disabling operation if the connector of float switch has defective contact or is
connected incompletely.
0V
0V
0V
5V
R621C620R539Microcomputer
R620
CN16
FLOAT SW
Normally Hi (4.5V)
53
1
2
+
—
9. Drain pump drive circuit
58
5
12
1
12V
Drain pump motor
CN3
C116
IC711
Micro computer
Drain pump
C113 C115
C112
L102
NF1
L101
GRN1
C110C108C106
C105VA03
3.15A FUSE
AC230V
C111C109
C107
C114
DRAIN PUMP
- RELLAY
2
3
M
Drain pump drive circuit is using drain pump relay that control by micro computer pin no 58 to drive the drain
pump.
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