Indoor Installation Manual

14.3. 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 re-
sume. See installation below:
23

(CN4F)
The circuit board is equipped with a connection to attach a

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:
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 0.50 0.80
MVZ-A18 0.30 0.50 0.80
MVZ-A24 0.30 0.50 0.80
MVZ-A30 0.30 0.50 0.80
MVZ-A36 0.30 0.50 0.80*

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


Pressure Setting
External Static
Pressure
Setting No. of

08/108

Function 10/110
(Factory Setting)
0.3 in. WG [75Pa] 1 1
0.5 in. WG [125Pa]
(Factory Setting)
2 1
0.8 in. WG [200Pa] 3 1

External Static
Pressure
Setting No. of

08/108
Setting No. of

10/110
0.3 in. WG [75Pa] 1 2
0.5 in. WG [125Pa]
(Factory Setting)
2 2
0.8 in. WG [200Pa]* 3 2

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

the wires. Carefully reinstall the
connector back on the board.
When the Normally Closed Float
Switch opens, the Indoor unit will
turn off.
SVZ-KP12,18, 24, 30, 36NA
Specifications are subject to change without notice. 47 © 2022 Mitsubishi Electric US, Inc.
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