And Av2+ Ventilator Controller Assembly - Dräger Narkomed 2C Technical & Service Manual

NM2C
4.12 AV-2 and AV-2+ Ventilator Controller Assembly
The Ventilator Controller assembly is attached to the left front panel of the
ventilator box and includes electrical and pneumatic components. Figures 4-12
and 4-12A show the mounting screw locations and connections to the ventilator
controller.
4.12.1
4.12.2
CAUTION:
4.12.3
4.12.4
4.12.5
4.12.6
4.12.7
4.12.8
4.12.9
Rev. F
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REPLACEMENT PROCEDURES (continued)
Set the System Power switch to STANDBY and remove AC power
from the machine.
Disconnect all pipeline hoses and close all cylinder valves.
The controller circuit board contains static sensitive devices. Use
ESD protection when handling the controller assembly.
Remove the two screws securing the left end of the ventilator
controller panel.
Pull the left side of the panel outward, slide it to the left until the
locking tab on the right side of the panel is clear of its receptacle,
then pull the assembly out far enough to gain access to its
connections.
Disconnect the alarm channel wiring harness from J2 on the
controller circuit board. On AV2+ controllers, also disconnect the
Man/Auto selector interface cable from J7 on the circuit board.
Disconnect the following large and small diameter pneumatic tubing
(the letters are keyed to the illustration):
A: Small dia. tube from solenoid to rear vent fitting on bellows box
B: Large dia. tube from supply valve to venturi
C: Small dia. tube to auto-ranging valve
D: Large dia. tube from main switch (O
Remove the controller assembly from the machine.
Position the replacement controller assembly in the ventilator box
and reconnect the four pneumatic lines.
Reconnect the alarm channel wire harness to J2 on the controller
circuit board. On AV2+ controllers, also reconnect the Man/Auto
selector interface cable to J7 on the circuit board.
4-39
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