Q155 Service Manual
4-3
Note
Leaks can be so small in air loss that purity is not affected immediately. The
sieve material can become contaminated gradually. Careful leak testing is
important. (Refer to Section 2.16)
4.4.
Compressor
The compressor produce compressed air to enter the sieve bed. The nitrogen is
adsorbed in the sieve bed and the oxygen to flow out of the sieve bed. The noise and
thermal energy of the concentrator result mainly from the compressor. So the
efficiency of producing oxygen and noise level of the concentrator are decided by
compressor. So there are two different conditions of the compressor that cause
concern: compressor output and noise level.
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Output
Compressor output refers to how much volume and pressure of compressed air
the compressor can produce. Because seals wear, the compressor output
reduces gradually after a long time period and results in the reduction of
oxygen purity. You can detect the oxygen purity at 5 lpm. If the purity is below
90%, the concentrator needs service.
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Noise Level
The conditions of the compressors bearings mainly determine its sound level. If
the bearings wear that they become too noisy, the compressor will need to be
rebuilt or replaced.
4.4.1.
Compressor Maintenance
Preventative maintenance on the Merits compressor is not required. You do not
need to perform any maintenance on the compressor as long as the concentrator
output is within Merits
’
specifications. (See Section 1.1)
4.4.2.
Compressor Assembly Replacement
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Compressor Assembly Removal
To remove the compressor assembly for replacement, follow the below steps:
i.
Set the unit's ON/OFF switch to the OFF position, and unplug the power
cord.
ii.
Remove the cabinet and remove the crashproof plate above compressor.
(See section 4.2.1)
iii.
Disconnect the feed and suction tubes, as shown in Figure 4-7
iv.
Disconnect the two leads of compressor. (See Figure 4-8)
v.
Take away compressor directly.