Solenoids; Entrainment On/Off Switch - BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual

IX. MAINTENANCE AND SERVICE- cont.
f. Making sure the valve is properly centered in the bracket slot, place the washer and nut on the
valve and secure the valve so it is held in place, but still can be moved back and forth within the
slot.
g. Turn the elbow fitting in the back of the valve so it is directed down, reconnect the supply tube
and secure it with a cable tie.
h. Starting with the tube on port 1 (next to the mark) on the valve, push the open end of this tube
onto the barb on the venturi that is in the top row and closest to the front of the unit.
i. The next tube to connect will be port 2. This is the barb directly to the left of the port 1 barb
(CCW as viewed from the rear). Connect this to the bottom barb closest to the front of the
unit on the venturi block.
j. Continue connecting the tubes from the valve to the venturi, moving in a counterclockwise
direction around the valve and front to rear, alternating top to bottom, on the venturi until all
the tubing has been connected.
k. The valve must now be positioned in the slot for proper engagement with the gear on the
potentiometer. Place the Flow Valve gear on the shaft of the Entrainment Flow Valve and
temporarily tighten one setscrew just enough to hold the gear in place.
l. To aid in establishing an acceptable engagement of the gears, place a small strip of paper
(standard copier paper approx. 5-6 mil thick) between the gears and slide the valve towards the
potentiometer until the gears mesh snugly with the paper between them.
m. Hold the valve in this position within the slot, remove the gear and tighten the retaining nut to
lock the valve in this position. Be careful the valve does not move within the slot.
n. Refer to the Calibration section on Flow Valve/Potentiometer Zero as well as the one on Flow
(Entrainment on) for instruction on properly zeroing the valve, securing the gear and calibrating
the valve.
4. MAX PRESSURE & PEEP VALVES
The procedure for either of these valves is the same.
a. Loosen the two setscrews in the valve shaft extender and remove the extender,
b. Remove the retaining nut and withdraw the valve from the bracket, making note of the
orientation of the barbs as they were when mounted.
c. Taking note of which color tube goes to each barb, cut the tubing from the barbs on the valve
as close to the barb as possible.
d. To install, press the appropriate tubing onto each barb and install the valve into the bracket
with the barbs positioned as previously noted.
e. Secure with its nut.
f. Refer to the Pneumatic Calibration section on PEEP Valve Zero and MAX Pressure Valve Zero
for instructions on reinstalling the valve extender and then check the PEEP Signal and MAX
Pressure Signal calibration.

9. SOLENOIDS

9. SOLENOIDS 9. SOLENOIDS 9. SOLENOIDS
See Cautions at the beginning of this section.
1. Remove the rear panel and battery.
2. Remove the RS232 connector from the inside of the case by unplugging the cable and removing the
single retaining screw. The lower corner snaps onto a stud. Pry it off this stud and remove the
part.
14.
3. Remove the two Solenoid Manifold retaining nuts and washers and lower the assembly off its
mounting studs.
4. Position the assembly so the component side of the Solenoid PCB is facing you.
5. Locate the solenoid pins on the PCB. They will have resistors across them. Carefully de-solder all
the solenoids. Remove the two screws holding the board to the manifold and separate the PCB from
the solenoids.
6. Unscrew the two screws holding the solenoid to be replaced to the manifold and remove the
solenoid.
7. Making sure the gasket is properly fitted around the new solenoid's ports, secure it to the manifold
with the screws.
8. With the component side facing away from the solenoids, place the Solenoid PCB over the solenoid
pins and secure it to the manifold with the two screws.
9. Re-solder each solenoid to the Solenoid PCB and reassemble in reverse order.

10. ENTRAINMENT ON/OFF SWITCH

10. ENTRAINMENT ON/OFF SWITCH 10. ENTRAINMENT ON/OFF SWITCH 10. ENTRAINMENT ON/OFF SWITCH
The Entrainment ON/OFF Switch is not serviceable and its removal is straightforward. The following
describes replacement of the micro-switch mounted to the ON/OFF switch.
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