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738.955 | 10.40
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7.7 Flow test service function
The flow test service function is used to check the flow
rate at maximum pump speed. The pump remains
switched on at 100 % performance while the flow
test service function is activated.
NOTE
A Grundfos Direct Sensors
TM
VFS 1-12 must be con-
nected in order to use the flow test service function.
Safety limits (maximum collector temperature, maxi-
mum storage tank temperature) are not taken into
account while the service function is active.
7.8 Speed cont
rol
The controller provides a PWM control signal for con-
trolling the speed of an ECM pump; see PWM charac-
teristics at the right (RPM =
revolutions / minute).
NOTE
At the factory the controller is set to speed control
"on".
The speed control function controls the settings of the
solar circuit pump.
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