System controller
External
operation
switch
Pressure
switch
Remote
controller
Pressure switch
(closed when the external
exhaust fan is normally operated)
Power Supply
Connect to terminals
Relay
Pressure Switch Terminal
15VDC, 2.7mA
Pressure Switch
* Do not connect communication cords with each unit
or remote controller to these terminals by mistake.
● A pressure switch or other item can be attached as a safety device when an external exhaust fan that is attached
to the exhaust fan terminal above does not operate.
● If the status that a contact of the relay is opened continues, the system stops.
● Use the normally open relay with the contact for low voltage.
● This terminal is short-circuited when the product is shipped from factory. When you use this feature, connect relay,
and then disconnect a short-circuit connector as shown below.
Connections of Pressure Switch, External Operation Switch, and Thermostat (input terminals)
Disconnect this connector
when pressure switch is connected.
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