Q155 Service Manual
4-2
4.3.3.
Sieve Bed Replacement
After long term usage, the ability of producing oxygen of molecular sieve
finally decline. It is necessary to replace sieve bed for solving this issue. Please
pay attention to replace both sieve bed at the same time. Please follow the
following procedure to replace sieve bed:
Caution
Do not expose molecular sieve (contents of sieve bed) to air for an extended
period of time. Prolonged exposure of molecular sieve to the moisture in room
air results in contamination and permanent damage to the sieve material. Keep
all openings to the sieve beds sealed.
i.
Set the unit's ON/OFF switch to the OFF position, and unplug the power
cord.
ii.
Remove the cabinet.(See section 4.2.1)
iii.
Loose the mounting band of sieve bed to free sieve beds. (See Figure 4-6)
iv.
Remove the sieve beds.
v.
Remove solenoid valve assembly. (See Section 4.3.1)
vi.
Seal the openings on the top of the sieve beds to prevent moisture damage.
Figure 4-6 the mounting band of sieve bed
vii.
To install the sieve bed, follow the sieve bed removal procedure in reverse
orders. It is important to secure clamps on all tubes to eliminate leaks.
viii.
To check for leaks:
n
Plug in the unit.
n
Set the unit's ON/OFF switch to ON for three minutes with the flow meter
setting at the 5 LPM.
n
Apply soapy water around the sieve beds tubing connections, and check
for leaks.
n
Set the unit's ON/OFF switch to OFF, and unplug the power cord.
The mounting band