DeVilbiss Drive 1025DS - Compressor System Testing and Repair

19
LT-2329
COMPONENT TESTING, REPAIR AND REPLACMENT
CHECK VALVES / MANIFOLD
Manifold And Sieve Bed Check Valves
The manifold check valves, located in the manifold attached to the accumulator
tank, and the sieve bed check valves, located in the purge harness between the
outlet of each sieve bed and the accumulator tank, allow oxygen to pass from the
sieve beds to the accumulator tank when the bed pressure is greater than the
accumulator tank pressure. These valves also prevent reverse ow of oxygen
from the accumulator tank to the sieve beds.
The manifold also directs a small amount of pressurized oxygen into the
discharging sieve bed to aid the nitrogen exhaust process. The purge harness
includes a xed orice that performs the same function.
A defective manifold or sieve bed check valve will result in lower oxygen
concentrations and accumulator pressures.
Use the Accumulator Pressure Test listed previously to troubleshoot manifold or
sieve bed check valves.
• To replace a defective sieve bed 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.
• To replace a defective manifold check valve, replace the manifold.
NOTE– Also see Manifold section on page 22.
COMPRESSOR
The Drive DeVilbiss Oxygen Concentrator uses a double-head, oil-free
compressor. The compressor is secured to the base with a mounting plate and
four motor mounts.
Electrical Connector
Exhaust Fitting
Intake Fitting
Pressure Relief Valve
Changes were made to the original compressor in January, 2020. These changes
include a redesigned valve plate and sleeve with heat sink. All 1025 models now
have the updated compressor. See gures below.
(Updated compressor
with redesigned valve
plate and sleeve.)
Sleeve w/Heat Sink Valve Plate
A compressor that is worn or defective may:
• cause pressure to rise slowly.
• cause excessive noise and/or vibration.
• cause lower oxygen concentrations.
A worn or defective compressor can be caused by a defective internal
component such as:
• reed valve
• o-ring
• gasket
• cup seal
These components are included in the Compressor Rebuild Kit (1025D-643 and
1025K-643).
Sleeve
Rod Screw
Cup Seal
Cup
Retainer
Valve Plate
Bottom Reed
Valve & Retainer
O-Ring
Sleeve
Top Reed Valve
& Retainer
Head Gaskets
Intake Fittings
PR
Valve
Head Screw
Connecting
Tubes
Exhaust
Fitting
NOTE– A built-in thermal cutoff switch will shut the compressor off if it
becomes overheated. This protects the compressor from damage caused by heat
build-up. (Some models have an auxiliary thermostat mounted within the
compressor compartment.) Should this condition occur, the compressor will
require several minutes for the thermo-protective device to reset.
NOTE– A pressure relief (PR) valve is located on the pressure head to
prevent high pressure build up in the system should a component malfunction
occur.