Biddle HR 25 - Removing the Control Circuit Board

SERVICE HEAT RECOVERY UNIT
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7.2 Removing the control circuit board
1. Switch the unit off using the control panel or the building
management system.
Warning:
w Shut off the mains supply.
2. Open the electronic housing.
3. Disconnect all unit-connected connectors and gr
ounded
connections fr
om the control circuit board.
4. Remove the screw 3.
5. Slide the control circuit board 4
loose and lift it out of the
un
it.
7.3 Connecting the control circuit board
Warning:
w Make sure that the mains supply is switched
off
1. Slide the control circuit board into its place and screw it
in
fi
rmly.
2. Connect all connectors and earth connections to the con-
trol circuit board again.
3. Switch the unit on and check the operation.
Note:
n With a new control circuit board, an E1 error may
occur because the old control circuit board can no
longer be found. Resolve this by reconfiguring the
system via menu > Maintenance > Reset system