Pneumatic Valve Bracket Assembly - BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual

IX. MAINTENANCE AND SERVICE- cont.
nick the barb (refer to Fig. 16 in Preventive Maintenance Kits later in this section). This is easiest
to do after the pneumatics have been completely removed.
7. Tubing from the MAX Pressure valve is routed between the case and the rear panel screw guide on
the side of the case. Work these tubes out from behind this guide.
8. Remove the three screws from the bottom of the case.
assembly.
9. Although not necessary, the RS232 connector may be removed from the side of the case to facilitate
removal of the solenoid assembly. To remove it, remove the single retaining screw. The lower
corner snaps onto a stud. Pry it off this stud and remove the part.
10. Unplug the Pressure Sensor Switch from the PCB and remove the two nuts and lock washers used
to retain the solenoid manifold assembly to the top of the case and lower the assembly off the studs.
11. Remove the two nuts with washers that retain the supply pressure sensor to the bottom of the
battery compartment. When everything is removed, take care the thin tubing to this sensor is not
damaged.
12. The pneumatics are now free from the case and may be removed.
13. Reassemble in the reverse order.

7. PNEUMATIC VALVE BRACKET ASSEMBLY

7. PNEUMATIC VALVE BRACKET ASSEMBLY
7. PNEUMATIC VALVE BRACKET ASSEMBLY 7. PNEUMATIC VALVE BRACKET ASSEMBLY
1. Remove rear panel, battery, and front bezel. It is not necessary to remove the PCB to remove the
Valve Bracket, but it may be easier if it is removed. This instruction assumes it is not removed.
2. Unplug the potentiometer from the front of the PCB (JPOT) as well as the Entrainment Switch
connector (JETRAIN), if present.
3. From the outside of the Crossvent, remove the two screws at the bleed exhaust screen next to the
gas supply fitting. This will free the 9-port bleed manifold inside the case. Watch for the o-ring
inside this manifold. Do not misplace this if it should fall out.
4. It is best to remove the Pressure Regulator along with the bracket so the tubing between it and the
Flow Valve are not disturbed. To remove the regulator, unscrew the supply fitting on the outside of
the case and remove it along with the filter inside. The regulator is now free from the case and will
come out with the bracket assembly.
5. If the unit has Air Entrainment installed, then loosen the setscrews holding the knob on the
Entrainment Switch, remove the knob and remove the switch's retaining nut. Push the switch into
the case.
6. On the opposite side of the case, locate the manifold (small block with relief valve) into which the
patient connector threads.
manifold. Using a hex key, loosen this setscrew. The patient manifold may now be unscrewed.
Watch for a gasket between the manifold and connector. When reassembling, do not over-tighten
this connector or the gasket will distort. Thread in until it is seated and then turn it another half
turn and secure it with the setscrew.
7. Tubing from the MAX Pressure valve is routed between the case and a rear panel screw guide on the
side of the case. Work these tubes out from behind this guide.
8. Prior to cutting any tubing, always make a note of its location or label it for reference when
reassembling. Cut this tubing as close to the barb as possible-
a. Yellow tube on MAX Pressure Valve (22, Fig. 10).
b. Yellow tube on DARV Manifold (10/10A)
c. Blue tube from the PEEP Variable Resistor (131). Cut where it connects to the tee with the
yellow tube.
d. Green tube at the pressure sensor located on the battery enclosure.
e. Green tube from the bottom of the regulator to the solenoid manifold. Cut at the manifold
barb.
f. Clear tube to the manifold at solenoid A. Cut at the manifold barb.
g. Clear tube from the regulator to the Flush Variable Resistors (132). Cut at the tee.
9. Cut the cable tie and remove the 1/8" tube from the check valve between the regulator and the 9-
port manifold.
10. Remove the three screws on the bottom of the Crossvent. The bracket along with the regulator can
now be removed. Pull it straight back while guiding the potentiometer cable (and Entrainment
Switch cable) under the PCB.
Reassemble in the reverse order. Prior to reassembling, carefully cut off the tubing left on any barbs, taking
care not to damage or nick the barbs (refer to Fig. 16 in Preventive Maintenance Kits later in this section).
From the back of the unit, there is a setscrew recessed into this
These retain the pneumatic bracket
62 62
62 62