20
LT-1928
4. Cut plastic cable ties on sieve bed hoses.
5. Loosen speedy clamps and remove bed hoses from each side
of valve.
6. Loosen ladder clamps and remove pressure intake and exhaust
hoses from backside of valve.
7. Replace foam dampers, if necessary, with ones included in new
valve package.
8. Install the new rotary valve by reversing the above procedure.
NOTE:
Use minimal force when tightening the cable ties
around the rotary valve. Overtightening the cable ties can
transmit sound to the cabinet, increasing noise level.
SIEVE BED CHECK VALVES
A check valve (Figure 9) located between the outlet of each
sieve bed and the accumulator tank allows oxygen to pass
through the sieve beds to the accumulator tank when the bed
pressure is greater than the accumulator tank pressure.These
valves also prevent reverse flow of oxygen from the accumula-
tor to the sieve beds.
Run the accumulator pressure test described in the
Component
Testing, Repair, and Replacement
section. It covers details of
attaching the gauge. Acceptable pressure swing ranges at vari-
ous altitudes are included in the
Specifications
.
A defective check valve will result in a decrease in oxygen con-
centration and lower accumulator pressures.
To replace a defective check valve, remove the tubing on
either side of it and install a new valve making sure the outlet
end is toward the accumulator tank.
C O M P O N E N T T E S T I N G , R E P A I R , A N D R E P L A C E M E N T
Summary of Contents for DeVilbiss 515ADS
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Page 92: ...92 LT 1928 F I G U R A S D I A G R A M A S Y V I S T A S Figure 14 Diagrama Neum tico...
Page 93: ...93 LT 1928 F I G U R A S D I A G R A M A S Y V I S T A S Figura 15 Diagrama de Cableado...
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