Toshiba HWS-803XWHM3-E Service Manual page 71

Item
8-3. 13) Automatic restart control
Hydro Unit Control
The unit records operation information before a power outage and retrieves the information after the power is
restored to restart automatically the operation with the information.
13-1)Operation during remote controller
• The operation status before a power outage automatically re starts after the power is restored. (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 restored.
But the merit functions (Night Set Back, Anti Bacteria) are disabled.
The remote controller time displays "--:--". (The merit functions are disabled)
13-2)Operation during forcible automatic operation
A forcible automatic operation is performed when the power is restored after a power outage.
13-3) Operation during defrosting operation
When the power is restored 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:
14) 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.
14-1)Piping freeze prevention control 1
1) Start condition: TWO < 4°C or THWI < 4°C.or THO < 4°C
2) End condition: TWO
3)-1 How to operate (circulation pump)
• When the circulation pump is not in operation, if t h e 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 operati on, 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 operati on, if the end condition is not met when 3 minutes has
passed after an operation starts.
• End condition: TWO
• Heating with the set temperature 55°C operates.
3)-3 Abnormal stop
• If a freeze prevention operation continues for 30 minut e s and does not meet the end condition, the operation
stops as abnormal stop. (Remote controller check code: A05)
14-2)Piping freeze prevention control 2
TC and TWO activates freeze prevention regardless of a heat pump operation mode.
1) Determination condition: TWO>20°C, 2*TC+TWO<-12°C is continuously detected for 30 seconds or longer. Or
TWO
2) Determination cancellation conditions
• The stop or operation mode is changed by the remote controller
• The mode is defrosting at the time of determination
At the next time of defrosting, the start condition is not met.
• The mode is other than defrosting at the time of determination
After cooling, heating, hot water heat pump restarts, the start condition is not met for 10 minutes.
3) Error display
• If freeze determination cancellation condi tion is not met, A04 error is displayed.
14-3)Piping freeze prevention control 3
This control applies only when defrosting is in operation.
1) Determination condition: During defrosting, TWI
the stop, the unit restarts.)
2) Determination cancellation condition
• At the next time of defrosting, the start condition is not met.
3) Error display
• If freeze determination cancellation condi tion is not met, A04 error is displayed.
Operation flow and applicable data, etc.
Hot water supply operation (Anti Bacteria)
Heating operation (Night Set Back)
5°C and TWI
5°C and TWI
20°C, TC+TWO<4°C is continuously detected for 30 seconds or longer.
5°C and THO 5°C
5°C and THO 5°C
15°C is continuously detected for 30 seconds or longer (After
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