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Toshiba
8-3.
Hydro Unit
Control
7)Automatic restart control
The unit records operation information before a power outage and retrieves the information after the power is on again
to restart automatically the operation with the information.
7-1)Operation during remote controller
• The operation status before a power outage automatically restarts after the power is on again. (The merit functions
are also enabled)
• Approximately 6 hours or more after a power outage
The operation status before a power outage automatically restarts after the power is on again.
But the merit functions (Night Set Back, Anti Bacteria) are disabled.
The remote controller time displays "--:--". (The merit functions are disabled)
7-2)Operation during forcible automatic operation
A forcible automatic operation is performed when the power is on again after a power outage.
7-3) Operation during defrosting operation
When the power is on again after a power outage, the usual operation restarts.
Note: The operation details recorded before a power outage
Operation mode: Hot water supply, Heating, Cooling, Hot water supply + Heating, Hot water supply + Cooling
Set temperature: Hot water set temperature, Heating set temperature, Cooling set temperature
Merit function: Hot water supply operation (Anti Bacteria)
Heating operation (Night Set Back)
8)Piping freeze prevention control
This control operates when the power is on regardless the remote controller setting ON or OFF.
To prevent frost bursting of the water piping for hot water supply and heating, the unit flows water with the circulation
pump when the temperature sensor value falls below a certain temperature.
8-1)Piping freeze prevention control 1
1)Start condition: TWO < 4°C or THWI < 4°C.or THO < 4°C
2)End condition: TWO 5°C and TWI 5°C and THO 5°C
3)-1 How to operate (circulation pump)
• When the circulation pump is not in operation, if the sensor detects the freeze prevention control start
temperature, the unit operate the circulation pump.
• During a freeze prevention operation, a heat pump operation does not start.
• When neither [HOT WATER] nor [ZONE1, 2] is in operation, if the end condition is not met when 3 minutes has
passed after an operation starts, the unit performs the operation in 3)-2 to prevent freeze.
3)-2 How to operate (circulation pump + backup heater)
• When neither [HOT WATER] nor [ZONE1, 2] is in operation, if the end condition is not met when 3 minutes has
passed after an operation starts.
• End condition: TWO 5°C and TWI 5°C and THO 5°C
• Heating with the set temperature 55°C operates.
3)-3 Abnormal stop
• If a freeze prevention operation continues for 30 minutes and does not meet the end condition, the operation
stops as abnormal stop. (Remote controller check code: A5)
Item Operation flow and applicable data, etc.
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 54 Monday, October 5, 2009 2:09 PM