Drain Pump Trial Run Switch; Float Switch - Hitachi RAF-25NH4 Service Manual

10. 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.

11. Float switch

Microcomputer
¥ 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.
47
Microcomputer
50
C931
0V 0V
5V
R527
0V
5V
R931
R932
Normally Hi (4.5V)
192
R522
Drain pump
trial run SW
(normally, Hi)
2
1
CN2
FLOAT SW