1 Introduction
1.1 Intended purpose
The SC400 and SC410 control elements including the SR400 and SR410 relays boards are
systems intended to control the HVAC components (heating, ventilation, air-conditioning) in
buses, for example for roof-top air-condition systems. They consist of a control element inte-
grated into the dashboard (control device as an interface between human and machine) and an
accessible relays board.
The systems are available in basic (SC400/SR400) and standard versions (SC410/SR410),
respectively. In the basic version, the control element allows the driver to control the roof-top
air-conditioning system that has air-conditioning functions. The standard version also has an
optional heating function and can be set between air-conditioning and recirculating air functions.
The controller for the air-conditioning components can operate automatically. To do so, the bus
driver simply has to set the desired room temperature.
These operating instructions apply to the following air conditioning system variants:
➔ SC400: Air-conditioning system (AC)
➔ SC410: Air-conditioning system with air-conditioning function (VAC), air-conditioning system
with heating function (HAC), air-conditioning system with heating and air-conditioning functions
(HVAC).
1.2 Symbols used
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