Condensate Overflow Safety Switch Connection (Cn4F); Changing Blower External Static Pressure - Mitsubishi Electric MVZ-A12AA7 Installation Manual

13.3. Condensate overflow safety switch connection
(CN4F)
The circuit board is equipped with a connection to attach a
condensate safety float switch. The switch should be a normally
closed low voltage rated switch. The switch should be installed in a
location that it can sense a drain blockage causing a rise in water
level. This resulting rise in level will cause it to open. The switch
location is to be determined by the installing contractor. When the
switch opens, it will cause the LEV to close, stopping the cooling
operation. The fan will continue to run and a fault code will be shown
at the controller. Correcting the problem and closing the switch will
be required before normal operation can resume.
See installation below:
Locate the CN4F connector on the
control board. Carefully remove the
connector with the jumper from the
board. Cut the jumper on the CN4F
connector and wire a normally
closed safety float switch across
the wires. Carefully reinstall the
connector back on the board.
When the Normally Closed Float
Switch opens, the Indoor unit will
turn off.

13.4. Changing blower external static pressure

The air handler is equipped with an adjustable static pressure
setting. The available settings are shown in the table below.
Model Available ESP [in. WG]
MVZ-A12 0.30
MVZ-A18 0.30
MVZ-A24 0.30
MVZ-A30 0.30
MVZ-A36 0.30
*MVZ-A36 in Downflow External Static pressure: 0.60
The air handler will be set to 0.50 ESP from the factory.
The air handler's static pressure can be changed through the mode/
function settings in the controller. Please refer to the installation
manual for the controller on how to change this option. Depending
on the controller used, the mode/function will be either 08 for mode
(PAR-31 & Simple MA) or 108 for function (MHK1). Please notice
there are different settings when installing the air handler in the
downflow position.
Vertical, Horizontal Left, Horizontal Right External Static
Pressure Setting
Setting No. of
External Static
Mode/Function
Pressure
08/108
0.3 in. WG [75Pa]
0.5 in. WG [125Pa]
(Factory Setting)
0.8 in. WG [200Pa]
Downflow External Static Pressure Setting
Setting No. of
External Static
Mode/Function
Pressure
08/108
0.3 in. WG [75Pa]
0.5 in. WG [125Pa]
(Factory Setting)
0.8 in. WG [200Pa]*
*MVZ-A36 in Downflow External Static pressure: 0.60
0.50 0.80
0.50 0.80
0.50 0.80
0.50 0.80
0.50 0.80*
Setting No. of Mode/
Function 10/110
(Factory Setting)
1 1
2 1
3 1
Setting No. of
Mode/Function
10/110
1 2
2 2
3 2
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