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en
S
ERVICE
7.2
Removing the control circuit board
7.3
Connecting the control circuit board
en-56
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 grounded
connections from the control circuit board.
4. Remove the screw 3.
5. Slide the control circuit board 4 loose and lift it out of the
unit.
Warning:
w
Make sure that the mains supply is switched
off
1. Slide the control circuit board into its place and screw it in
firmly.
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
H
EAT RECOVERY UNIT
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