MatrixMonitor™ IOM - Rev 4 - 4/11/2013
Page 60
5.
Remove all of the connections to the grounding
strip.
6.
Remove the 4 screws holding the backplane to the
ABS NEMA 4 enclosure and carefully pull out the
backplane with the power supply on it.
7.
Remove the screws on the back of the panel
holding the power supply to the backplane.
8.
Dispose of the old power supply observing all local
and state laws and regulations concerning the
disposal of electronic equipment.
9.
Install the new power supply on the backplane
using the same hardware.
10.
Reinstall the backplane in the control enclosure and reconnect the wiring by reversing the order
of instructions 1 to 7 above.
Mother Board
The mother board is installed on the swing out graphic panel. The
mother board can be removed and reinstalled in place but it is
extremely difficult to replace the four tiny #4 machine screws that
hold the mother board to the swing out graphic panel while it is in
place on an air handling unit. ClimateCraft® recommends you first
remove the graphic panel from the NEMA 4 enclosure per the
instructions listed above. Reinstall the panel using the same
instructions.
To remove the mother board from the swing out graphic panel:
1.
Place the graphic panel on your work surface with the keypad display down and the mother
board facing up.
2.
Locate the four #4 screws that hold the board down to the standoffs on the graphic panel. They
are identified on the motherboard silk screen as MH1, MH2, MH3, and MH4.
3.
There are captive spacers under the board and between
the board and the standoffs. Care must be taken not to
lose these spacers. Loosen one of the screws by three
turns and then move to the next and loosen it by three
turns. Do this for the rest of the screws and repeat this
rotation until the screws are free from the standoffs.
This procedure will keep the captive spacer on the
screws. Leave the screws in place and remove the
mother board by pulling it off of the pin connector
headers that connect the mother board to the keypad
display unit still attached to the graphic panel.
