– 12 –
Dry Tank Test
Upon initial installation, or anytime the power is off and power is then connected, the water heater will run a
dry tank test before starting the selected heating mode.
After approximately 2 minutes, the control will turn on the compressor and fan motor. The control will run
the sealed system for 5 minutes and monitor the tank temperature from the T2 sensor. If the control sees
a temperature rise of more than 3.5 degrees within the 5 minutes, it assumes the tank is empty, shuts off
heat, and displays an F11 fault code warning to ll the tank (a full tank would absorb the heat, and the
temperature increase would take longer).
Note: In the event of a power loss, when power is restored, the control will resume whatever heating mode
had been operating prior to power loss.
Sealed System Startup
Ambient
temperature OK?
45F< T5 >120F
Switch to electric
No
Is evaporator
free of frost?
T3a >32F
No
Yes
Start Sealed System
Yes
Ensure compressor
has been off for at
least 2 minutes
element
Switch to electric
element
The upper limit avoids a
compressor overheat, the lower
limit prevents liquid refrigerant
from entering the compressor
as well as inefciency due to the
lack of heat in the air.
Room temperature between
45°F and 120°F and
evaporator above 32°F?
Start sealed system.
(Continued Next Page)
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