AirSep MN138-1 H - Manual (Page 21)

15
MN138-1 Rev H
02/14
Leaks can be so small in air loss that oxygen concentration is not affected
immediately. The sieve material can become contaminated gradually.
Careful leak testing is important as the sieve material can become
contaminated gradually with very small leaks.
If replacement is necessary, you must replace both sieve beds at the same
time.
Sieve Bed Removal
To remove sieve beds, follow the steps below:
1. Set the unit’s I/ 0 switch to the “0” position and unplug the power cord.
2. Remove back panel.
3. Remove the fitting on the top of each sieve bed.
4. While keeping the four large sieve bed tie-wraps in place, gently pull upwards on
the top tie-wrap and remove each bed.
5. Lift each sieve bed from bottom tie-wrap and disconnect product tubing located at
bottom of each bed connection.
Sieve Bed Installation
To install the sieve beds, follow the sieve bed removal procedure in reverse order.
All tubing connections must be tightened properly to eliminate leaks. (Do not over
tighten fittings.)
To check for leaks, take the following steps:
1. Plug unit in and set the unit’s I/ 0 switch to the ‘ I ’ position.
2. Allow unit to run for three minutes.
3. Apply soapy water solution around tubing connections on both sieve beds, and
check for leaks.
4.6 Cabinet Fan
The cabinet fan pulls ambient air into the VisionAire unit. As this air is drawn in, the air cools
internal components (including the compressor) and exits out the bottom of the unit.
4.6.1 Cabinet Fan Replacement
Periodic adjustment of the compressor enclosure may be necessary
during this process.
Cabinet Fan Removal
To replace the cabinet fan, follow the steps below:
1. Set the unit’s I/ 0 switch to the “0” position and unplug the power cord.
2. Remove both front and back panels.
3. From back of unit, disconnect tubing connections at the equalization valve and
disconnect fittings from top of both sieve beds (Temporarily seal sieve bed
openings with tape to prevent the sieve material from being exposed to the
moisture in room air.)
4. From the front of the unit, disconnect small tubing from the in-line adaptor
leading to the sensor located on the circuit board.