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9. OPERATION FLOWCHARTS
9-1. Cooling, Dry
9-1-1. Starting Flowchart
Cool • Dry
Operation starts
Room temp. higher
than preset temp.
Coil thermistor
(higher than 46°F)
Operation lamp light ON
Dry
Cooling
Indoor fan: Start speed ON
NO
YES
NO
NO
NO
YES
YES
YES
YES
Troubleshoot
Operation starts
Overload relay works
1
2
Flap motor ON
Outdoor fan motor OFF
Compressor OFF
Compressor OFF
Outdoor fan motor OFF
Outdoor fan motor OFF
Flap motor OFF
Indoor fan OFF
Indoor power relay OFF
Outdoor power relay ON
Outdoor fan motor ON
Compressor ON
All lamps Light OFF
Compressor OFF
Coil thermistor
(higher than 36°F)
3 min. timer
count-up
YES
Cooling
Safety device works
18
Dry
19
Room temp. ≥ Preset
+2
Indoor fan
Outdoor fan motor ON
Compressor
NO
YES
Room temp. ≥ Preset
+2
Outdoor fan motor
ON
Compressor
YES
Room temp. ≥ 15°C
Monitor
Indoor fan
Outdoor fan motor OFF
Compressor
Outdoor fan motor
Compressor
3 min. ON
9 min. OFF
Intermittent
Indoor fan
Low &
very low
Indoor fan
Low &
very low
Dry A Dry B
9-1-2. Stopping Flowchart
Operation starts
Operation lamp Light OFF
Compressor OFF
Indoor fan OFF
Outdoor fan OFF
9-1-3. Check Refrigerant Cycle Flowchart
YES
Intake-outlet
temp. lower than
14 to 18°F
Current
(8.5A)
Obstructed heat exchanger
Over-charge of
refrigerant
Cooling operation
Refrigerant shortage
Troubleshoot
Capillary tube blockage
Cooling
NO
YES
YES
Pressure at
service port
(86 to 128psi)
NO
NO
Normal
Compressor failure
9-1-4. Time Flowchart
ON timer
Cool
Stop dry
Heat
Cool
Dry
Heat
NO
YES
Timer passes
Remote control unit
OFF timer set
Timer lamp Light ON
Timer lamp Light OFF
Operation lamp Light OFF
OFF timer
Cool
Dry
Heat
NO
YES
Timer passes
Remote control unit
OFF timer set
Timer lamp Light ON
Timer lamp Light OFF
42