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SiUS04-904
Main Functions
Function and Control
27
.
1.5
Automatic Operation
Automatic Cooling / Heating Function
When the AUTO mode is selected with the remote controller, the microcomputer automatically
determines the operation mode from cooling and heating according to the room temperature and
setting temperature at the time of operation startup, and automatically operates in that mode.
The unit automatically switches the operation mode to cooling or heating to maintain the room
temperature at the main unit setting temperature.
Detailed
Explanation of
the Function
1. Remote controller setting temperature is set as automatic cooling / heating setting temperature
(64 to 96°F / 18 ~ 35°C ).
2. Main unit setting temperature equals remote controller setting temperature.
3. Mode switching points are as follows.
���
Heating
Cooling switching point:
Room temperature
Main unit setting tempe
4.5°F (2.5°C) deg.
���
Cooling
Heating switching point:
Room temperature < Main unit setting temperature –
4.5°F (2.5°C) deg.
���
Thermostat ON / OFF point is the same as the ON / OFF point of cooling or heating
operation.
4. During initial operation
Room temperature
Remote controller setting temperature: Cooling operation
Room temperature < Remote controller setting temperature: Heating operation
64ºF (17.8ºC)
X
–
3.6ºF (2.0ºC)
X
–
0.9ºF(0.5ºC) =
63ºF(17.2ºC)
or
Y +
0.9ºF(0.5ºC)
63ºF (17.2ºC)
~
Z
Y
Zone B
Zone B
Zone A = Thermostat OFF
Zone C = Thermostat O
N
+
Δ
0.90ºF (0.5ºC)
(R6972)
Summary of Contents for FTXS09HVJU
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Page 9: ...Safety Considerations SiUS04 904 viii Safety Considerations...
Page 10: ...SiUS04 904 List of Functions 1 Part 1 List of Functions 1 Functions 2...
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Page 78: ...SiUS04 904 FTXS09 12HVJU Operation Manual 67...
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Page 87: ...FTXS09 12HVJU SiUS04 904 76 Operation Manual 3P232717 1C...
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Page 91: ...FTXS15 18 24HVJU SiUS04 904 80 Operation Manual...
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Page 95: ...FTXS15 18 24HVJU SiUS04 904 84 Operation Manual Do not hit or forcefully push the operation...
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