Condensate Overfl Ow Safety Switch Connection - Mitsubishi Electric CITY MULTI PVFY-P18 NAMU-E Installation Manual

Setting addresses
(Be sure to operate with the main power turned OFF.)
<Address board>
Lower right corner
of circuit board
SW14
There are two types of rotary switch setting available: setting
addresses 1 to 9 and over 10, and setting branch numbers.
How to set addresses:
Example: If Address is "3", leave SW12 (for over 10) at "0", and
match SW11 (for 1 to 9) with "3"
How to set branch numbers SW14 (Series R2 only):
Match the indoor unit's refrigerant pipe with the BC controller's
end connection number. If there is no BC controller used leave
at "0".
The rotary switches are all set to "0" when shipped from the factory.
These switches can be used to set unit addresses and branch
numbers at will.
The determination of indoor unit addresses varies with the system at
site. Set them referring to technical data.
Sensing room temperature with the built-in sensor in
a remote controller
If you need to sense room temperature with the built-in sensor on
a remote controller, set SW1-1 on the control board to "ON". The
setting of SW1-7 and SW1-8 as necessary also makes it possible to
adjust the air fl ow at a time when the heating thermometer is off.
When the heater is not used, DIP switch should be
set.
When the heater is not used, set the DIP switch 3-4 on the control
board to "OFF". When DIP switch 3-4 is "ON" as factory setting and
the heater is on, the fan will operate at high speed regardless of the
fan setting on the remote controller.
SW3
ON
OFF
1 2 3 4 5 6 7 8 9 10
ON
OFF
1 2 3 4 5 6 7 8 9 10
SW12 SW11
Factory setting : SW3-4=ON
Heater is not used: SW3-4=OFF
13.3. Condensate overfl ow safety switch connection
(CN4F)
The circuit board is equipped with a connection to attach a
condensate safety fl oat 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 fl oat 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.
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