Manifold Assembly - Sunrise Medical DeVilbiss 505DZ Service Manual

C O M P O N E N T T E S T I N G , R E P A I R & R E P L A C E M E N T

Manifold Assembly

The manifold assembly is located on the front of the unit below the bib and has two externally mounted valves, the four-way and
purge.These valves can be removed separately for cleaning or replacement when necessary.The base of the manifold assembly does
not have to be removed in this case.
The manifold base contains internal check valve, an orifice, and a pilot accumulator cavity with check valve. If troubleshooting
procedures reveal that a unit malfunction is the result of a failure of one of these check valves or any other internal manifold
problem, then the entire manifold base must be replaced. Do not take the base of the manifold apart nor attempt to change any
internal components.
Silicone tubing
Hose clamp
To remove manifold:
NOTE—Removal of the manifold will be easier if you remove the compressor first.
1. Unplug the unit from the wall outlet.
2. Remove the front and rear cabinets.
3. Remove the center oxygen outlet tubing from the top of the manifold assembly.
4. Loosen hose clamps and remove the left and right sieve bed oxygen supply hoses from the top of the manifold.
5. Loosen hose clamps and remove the left and right sieve bed hoses from the bottom of the manifold.
6. Disconnect the wires from the terminals on the four-way and purge pilot valves.
7. Remove the two mounting screws located at the upper left and lower right corners of the manifold.
8. Carefully pull the manifold assembly away from the unit a short distance to gain access to the pressure inlet fitting on the back
of the manifold.
9. Loosen hose clamp and remove the compressor exhaust hose from pressure inlet fitting and remove manifold assembly.
NOTE—If a replacement manifold is not to be installed immediately, then the sieve bed hoses should be sealed to prevent bed cont-
amination.
Valve isolation mount
Exhaust muffler
assembly
Felt pad
Elbow
(pressure inlet)
Manifold base
Figure 44
48
1/16" I.D. hose
Pilot valve
Purge valve
Plastic tee
Four-way valve
Pilot valve
1/16" I.D. hose