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4. Power Outage If the mains power is cut to the system for whatever reason, it is acceptable to run the unit using a generator. The unit will consume a maximum of approximately 2.5kw at -20°F ambient, so ensure that the generator is sized correctly. However, without backup power there is a risk of the 0.6 gallons of water contained in the outdoor unit and the approximate maximum of 1 gallon of water in the interconnect piping may freeze. Sanden has conducted tests where the unit has been left without power for 24 hours in a 25°F ambient and no freezing was reported. The water in the outdoor unit and piping can be drained manually using the air bleed screws, however the tank will need to be isolated before draining. An automatic system based on a drain back philosophy is available using three solenoid valves and a vacuum breaker to both isolate the tank and to drain down the outdoor unit and piping on power being cut. 19PDF Image | Sanden SANCO2 Heat Pump Water Heater 2017
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