core, pro, pro+ Integrated, and max Mattresses
Chapter 3: Theory of Operation
Centrella® Smart+ Bed Service Manual (193588 REV 12) 3 - 23
3
Air Deck Module (Pneumatic Assembly)
The air deck module provides the necessary pressurized air to achieve the following functions when
used with the max mattress: patient support function, turn assist, and MCM. The MCB communicates
the user inputs from the GCI, hand held remote control, or caregiver controls to the ACB. The ACB then
initiates the necessary action of the air deck. These commands help drive the functionality of the air
deck module, which can be separated into three major functions: MCM, patient support inflation and
deflation, and turn assist inflation and deflation.
• MCM—the module provides air flow through the top layer of the mattress to help manage
temperature and humidity as part of the effort to reduce deep tissue injury occurrence and
severity.
• Patient Support—the module provides the pressurized air to inflate support bladders to
perform the patient support functions such as pressure redistribution, Max Inflate, CPR assist,
Boost®, comfort adjust, side-exit assist, and side-sitting detect. The required set points for these
functions are controlled via the set point equations implemented in the software.
• Turn Assist—the module provides the pressurized air to inflate the turn assist bladders and
helps accelerate the deflation of the bladder by creating a passive suction in the bladders
during deflation. The required pressure is determined by the set point equations implemented
in the software.
The functional elements of the air deck module are:
•Air source (blower)
•Manifold
•ACB
• Surface detect sensor
• Pressure sensors
•Air deck enclosure
•Blower mounting plate
• Frame attachment isolators
• Blower mounting isolators
•Sound dampening foam
• Frame attachment bracket
•IPX4 cover
• Gaskets, air filter, and tubes
The air deck module is installed underneath the foot section of the bed and, through an interface
connector, is connected to tubes routed through the mattress to various zone bladders.
The MCB receives commands from the user control interface and sends the appropriate signals to the
ACB to control the air deck module. When a function is requested by the control interface, the ACB
energizes the appropriate solenoid valve(s) on the manifold and sets the appropriate pulse width
modulation (PWM) for the blower. The power budget for the air deck module is approximately 160
watts.
Air enters the air deck module through the inlet air filter. The air travels over the ACB and into the blower
inlet orifice. The blower is then able to push air through the manifold and tube routings to the
appropriate bladder(s).
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