Timer Function; Economy Function; Auto-Restart Function; Drain Pump Control - koppel KV24 ODU-ARF21C Service Manual

Electrical Control Function

1.3.5 Timer function

1.3.5.1 Timing range is 24 hours.
1.3.5.2 Timer on. The machine will turn on automatically when reaching the setting time.
1.3.5.3 Timer off. The machine will turn off automatically when reaching the setting time.
1.3.5.4 Timer on/off. The machine will turn on automatically when reaching the setting "on" time, and then
turn off automatically when reaching the setting "off" time.
1.3.5.5 Timer off/on. The machine will turn off automatically when reaching the setting "off" time, and then
turn on automatically when reaching the setting "on" time.
1.3.5.6 The timer function will not change the AC current operation mode. Suppose AC is off now, it will not
start up firstly after setting the "timer off" function. And when reaching the setting time, the timer LED will be
off and the AC running mode has not been changed.
1.3.5.7 The setting time is relative time.

1.3.6 Economy function

1.3.6.1 The sleep function is available in cooling, heating or auto mode.
1.3.6.2. Operation process in sleep mode is as follow:
When cooling, the setting temperature rises 1℃ (be lower than 30℃) every one hour, 2 hours later the
setting temperature stops rising and the indoor fan is fixed at low speed.
When heating, the setting temperature decreases 1℃ (be higher than 17℃) every one hour, 2 hours later
the setting temperature stops rising and indoor fan is fixed at low speed. (Anti-cold wind function has the
priority).
1.3.6.3 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode but doesn't turns off,
but for console, the unit will turn off.
1.3.6.4 Timer setting is available

1.3.7 Auto-Restart function

The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart module. In
case of a sudden power failure, the module memorizes the setting conditions before the power failure. The
unit will resume the previous operation setting (not including economy function and auxiliary functions)
automatically after 3 minutes when power returns.
1.3.8 Drain pump control (For Cassette)
Adopt the water-level switch to control the action of drain pump.
Main action under different condition :( every 5 seconds the system will check the water level one time)
1. When the A/C operates with cooling (including auto cooling) and forced cooling mode, the pump will start
running immediately and continuously, till stop cooling.
2. Once the water level increase and up to the control point, LED will alarm and the drain pump open and
continue checking the water level. If the water level fall down and LED disalarmed (drain pump delay close 1
minute) and operate with the last mode. Otherwise the entire system stop operating ( including the pump)
and LED remain alarming after 3 minutes.
Electrical Control System 95