[. . . ] How many Indoor Units can be connected? The TCB-IFCB5-PE Interface can be used to control a single Indoor Unit or a group of up to 8 Indoor Units when connected to the master unit of that group. Toshiba's Commitment to the environment Toshiba constantly works to ensure that our air conditioners help protect the environment while delivering comfort, reassurance, reliability and cost savings to our customers around the world. [. . . ] · OnPriority ExternalOn/OffcontrolhasOnpriority, butOffcontrolissetto last touch priority. · OffPriority ExternalOn/OffcontrolhasOffpriority, butOncontrolissetto last touch priority. · LastTouchPriority PriorityisgiventothemostrecentOn/Offcommand. How does the Window Switch Interface work?Window Switch & On/Off Application Control Board The Toshiba window switch operates with the use of a locally procured window switch interface (Volt-Free Contact). This switch is fitted to the window such that the contact is made when the window is closed, and broken when the window is open. Window switch TCB-IFCB5-PE OFF How does the On/Off Controller operate? TheRemoteOn/OffControlleroptionoperateswiththeuseofa locallysuppliedvolt-freeSwitch. Whentheswitchcontactismade theIndoorUnitwillturnOn. WhentheswitchcontactisbrokentheIndoorUnitwillswitchoff. WhatistheTCB-IFCB5-PE?This is an application control PC Board that is capable of providing two different control functions when connected to a Toshiba Indoor Unit, these are: · WindowSwitch · RemoteOn/OffInterfaceController WhatisaWindowSwitch?AWindowSwitchisadeviceusedtoensurethatanIndoorunit does not operate when a window in the air conditioned space is open. Each time the window is opened (contact open) the Indoor UnitoperationisturnedOffandwillnotoperateagainuntilthe window is closed. [. . . ] This function also allows the Interface to remember any ON commands sent to the Indoor Unit from another controller whilst the window is open, then using this information, it will switchtheIndoorUnitONwhenthewindowisclosedregardless of the previous setting. [. . . ]