North American HVAC MOC-12HFN1-MS0W, Service Manual

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Electrical Control Function
118 Electrical Control System
1.3.7.2. 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 auto 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 auto speed. (Anti-cold wind function has the
priority).
1.3.7.3 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and turns off
1.3.7.4 Shutdown, change the mode or speed setting will cancel the economic operation.
1.3.7.5 When user uses timer off function in sleep mode (or sleep function in timer off mode), if the timing is
less than 7 hours, sleep function will be cancelled when reaching the setting time. If the timing is more than 7
hours, the machine will not stop until reaches the setting time in sleep mode.
For other units:
1.3.7.1 The economy function is available in cooling, heating or auto mode.
1.3.7.2. 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).
1.3.7.3 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and turns off
1.3.7.4 Timer setting is available
1.3.8 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 swing function) automatically after 3 minutes
when power returns.
1.3.9 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), dehumidifying, 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,
1.3.10 Point Check Function (Excluding 12K &18K units &MOG-24HFN1-MT0W)
There is a check switch in outdoor PCB.