2
MSZ,MSY MICROPROCESSOR CONTROL
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| ) OPERATION |
| Difference between room | ||||||||||
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1. Thermostat control |
| temperature and set temper- | |||||||||||
Thermostat is ON or OFF by difference between room temperature and set temperature | ature during operation. | ||||||||||||
| Initial temperature difference | Thermostat Set temperature | |||||||||||
Room temperature minus set temperature : |
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Room temperature minus set temperature : less than |
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2. Indoor fan speed control |
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Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button | Difference between room | ||||||||||||
regardless of the thermostat’s |
| temperature and set temper- | |||||||||||
In AUTO the fan speed is as follows. | Fan speed | ature during operation ( T) | |||||||||||
| Initial temperature difference | ||||||||||||
Room temperature minus set temperature : 3.1 degrees or more ·······························High |
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Room temperature minus set temperature : Between 1.8 and 3.1 degrees ···················Med. |
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Room temperature minus set temperature : less than 1.8 degrees ····························Low |
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| 5.4deg. | ||||||
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1.8deg. 3.1deg. | |||||||||||||
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3.Coil frost prevention Temperature control
When indoor coil thermistor detects following temperature for 90 seconds, operational frequency of compressor is controlled according to the following table.
Temperature of indoor coil thermistor | Operation frequency |
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50°F or more | Normal (variable) |
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46°F to 50°F | Raise 6Hz |
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43°F to 46°F | Fixed |
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37°F to 43°F | Lower 3Hz |
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| Lower 6Hz |
37°F or less | Compressor is turned OFF for 5 minutes when temperature of |
| indoor coil thermistor continues 37°F or less for 5 minutes or more. |
The indoor fan maintains the actual speed of the moment.
4.Low outside temperature operation
If the outside temperature falls to 64°F or less during operation in COOL mode, the unit enters the low outside temperature operation mode.
<Operation>
(1)If the unit enters the low outside temperature operation mode, the outside fan rotation speed gets slow down.
(2)Even when the unit is in the
(3)In this mode to detect the exact outside temperature the compressor turns OFF with the outdoor fan ON for 3 minutes once 1 hour; if the outside temperature rises over 64°F, the unit goes back to the normal COOL mode, and if the outside temperature is still 64°F or less, the unit stays in the low outside temperature operation mode.
(4)Dew drop prevention
When the ambient temperature thermistor RT65 reads 10°F or less, as coil frost or dew drop from indoor unit may occur, the compressor turns OFF with the outdoor fan ON for prevention of them.
WOther protections work as well as in the normal COOL mode.
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