37
Figure 26: Valve check
Figure 27: Valve positions
When you have completed the valve check and select Next, you will see the
DHW test screen, which informs that the test can take up to 90 minutes (based
on a 300L cylinder). Selecting ‘Run test’ begins the DHW cycle and shows you
the time remaining (see gure 28).
The DHW test is important for non A-class cylinders to ensure that the cylinder
is compatible with the heat pump. If the coil in the cylinder is too small, the
maximum achievable temperature might be too low for comfort (e.g. < 40°C)
Figure 28: DHW Test
For system with A-class cylinders, the “Finish” button (gure 29) can be used before 60°C temperature has
been reached, as the compatibility doesn’t have to be proven.
Once the DWH cylinder is showing signs of being heated up then the Finish function allows to shorten the
DHW test without having to wait until temperature achieves 60°C.
This Finish function should be used in cold humid conditions to avoid defrost issues (defrost is currently
not enabled during DHW test).
It is recommended to pre-heated the cylinder rst by using normal function and then do a DHW test to
top-up the cylinder. Please refer to technical bulletin for detailed procedure.
NOTE: During the DHW test, the defrost function will be disabled. If the coil starts frosting due to
external conditions, it is possible to postpone the test by selecting Finish while the test is still running.
Even if this test is postponed, the DHW function may be used.
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